Search

The characteristics of the lateral nonlinear vibration in composite shaft-disk rotor system with nonlinear deformation are studied. Firstly, the equations of the kinetic energy of the composite shaft, the disk and the eccentric mass as well as the equations of the strain energy of the composite shaft are derived. Based on these equations, the nonlinear vibration equations are deduced by using the Lagrange equation. Then, the frequency response curves and time response curves of the system are obtained by using the IHB method and verified by the fourth order Runge-Kutta method. Experimental results show that the external damping coefficient, the size of eccentric mass only influences the nonlinear amplitude. Moreover, the ply-angle, thickness to diameter(T/D) ratio, length to diameter (L/D) ratio, and the position of disk in the shaft not only produce an effect on the nonlinear amplitude, but also influence the nonlinear vibration frequency.

The era of high speed railway has come and the most important issue of the high speed train is the safety, which is directly related to billions of families. One of the most serious threats to the safety of the high speed train is the vibration of train body at curve track, which may cause the train off the track. Semi-active vibration control method is a possible solution compared with active control method which has robust problem and passive control method which has efficiency issue. Magnetorheological technology is a typical semi-active vibration control method which has been widely used in the automobile, architectural construction and aerospace. The high speed train using magnetorheological technology has not been fully investigated especially for the dynamic performance at curve track. In this paper, a high-speed train model with MRF dampers is simulated by a combined ADAMS and MATLAB simulation. The dynamic performance of high speed train operating at different speeds and turning radius is investigated to reveal the mechanism of how the MRF damper affects the train’s stability and vibration. The results show that the semi-active suspension installed with MRF dampers substantially improves the stability and dynamic performance of the train at curve track.

An accurate and fast flowchart of surface-mounted permanent magnet brushless machine (SPMBM) design based on exact analytical method (EAM) rivaling finite element method (FEM) is formally proposed in this paper. It is recognized as a promising expert system for the preliminary electromagnetic design of SPMBM, even to replace the conventional design flowchart using equivalent magnetic circuit method (EMCM). By applying this expert system aiming at the low cogging torque and high power density, a special SPMBM named electronically commutated permanent magnet synchronous DC machine (PMSDCM) with conventional DC armature winding is put forward and verified based on both the simulation and experiment.

According to the characteristic of the coke oven process, the IGPC is applied on it. And an improvement is made on the implicit GPC. Introducing the soft coefficient matrix and making up the control increment decrease the calculation. And also, it can restrain overshoot of the output. Finally, the simulation results confirm that the implicit GPC is better than PID control algorithm.

In this paper, a mixed microbial population biotrickling filter (BTF) was investigated for styrene removal with two different packings at different empty bed residence times and gas-liquid ratio(GLR). The two biotrickling filters inoculated with a Pyrocarbon-sawdust and ceramic-raschig-rings-sawdust mixed packings were filled respectively in two identical laboratory-scale biotrickling filters which were operated in parallel. The results showed that the BTF filling with pyrocarbon-sawdust packings had higher rate of bio-film formation and removal efficiency of styrene than that of ceramic-raschig-rings-sawdust packings. When an inlet gas concentration of 50 to 450 mg/m³, an Empty Bed Residence Time (EBRT) of 21.6 to 43.2 s, and a gas-liquid ratio (GLR) of 110.7 to 55.3, a maximum styrene removal load is up to 153.1 g/(m³·h). During shock-load experiments with shutdown, the styrene removal efficiency of the BTF could gradually reach 92 % to 100 % by 14 h.

In truss-steel plate shear wall (SPSW) structures, the main role of SPSW is to provide horizontal and vertical stiffness for the system, which requires the SPSW capable of adapting to bi-directional loading. In order to satisfy the goal, stiffeners need to be added to the SPSW. In addition, openings are usually set within the SPSWs to meet certain architecture or utilization needs. Stiffener design criteria for such SPSW with or without opening are first derived according to the principle of yielding before buckling and local buckling before overall buckling. Then the deduced stiffener design criteria are compared with the current design codes. Finally the stiffener design recommendations are proposed for SPSW with or without opening adapting to bi-directional loading.

Opto-electronic detection and target recognition systems are widely used in the detection, monitoring, identification and other fields. In order to improve the flexibility and accuracy of this kind of system, we involved artificial intelligence technology into this area. As one of the most successful technology of artificial intelligence, expert systems (rule based systems) are widely used in industrial and intelligent control and other fields. This paper presents a general model of the rule based opto-electronic detection and object recognition systems. The model relies on the expert system tool—CLIPS which supports inference engine for reasoning. And a learning algorithm is used to generate the inference rules. In order to make the generated rules are easy to understand, decision tree algorithm was selected to apply in this general model. Finally, the model is applied to a vehicle identification test, a benchmark standard data-set from UCI machine learning repository was selected for this experiment. The experimental results show that the system has higher accuracy. Furthermore, this system is flexible for other target recognition as well, when the rules of relevant targets were added to this system.

This paper proposes a new idea about damping of suspended floor in huge frame constructions. By using mode-superposition response spectrum method, the inner force and displacement in theory was obtained. Suspended floor system has economical, theoretical, social and humanistic benefits, but is not mature technically. Thus in the end, the paper proposes subsequent researching directions about damping of suspended floor system based on the basic assumption in the program.

This paper proposes a new idea about damping of suspended floor in huge frame constructions. Experimental program and physical models were made, and then a lot of vibration tests by controlling acceleration and amplitude were taken respectively. The result shows that suspended floor has damping effect in a certain area and the damping degree is related to acceleration and amplitude. It also illustrates that changing frequency has more remarkable effect than changing amplitude.

Control strategy under unbalanced and distorted grid voltage is one of the most significant tasks for grid-connected inverter (GCI). In order to guarantee that the grid current meets the related IEEE Std.929-2000, a new control scheme was presented. Firstly, the typical model of GCI was presented. Secondly, the GCI control model based on PI-QR controller in synchronous reference frame (SRF) was built. Finally, the system’s simulation was conducted under distorted and unbalanced grid voltage. The results demonstrate the effectiveness of the presented control strategy.

A new wideband DOA estimation method based on Khatri-Rao subspace using uniform focusing is presented in this paper. Due to using the uniform focusing matrix which does not require pre-estimating the DOAs of signals in advance, its resolution is improved obviously and its computation complexity is reduced greatly. Meanwhile, it can also resolve more signals than the number of array sensors. Theoretical analysis and simulation results demonstrate the effectiveness and efficiency of the method.

This paper researches and analyzes the modeling of electro-hydraulic proportional servo system to improve the characteristics of forging hydraulic servo control system and meet their requirements of forging a variety of materials. Based on robust compensator design, PID control strategy is proposed with uncertain disturbance of hydraulic press hydraulic servo system and the response characteristics of the system is simulated and analyzed. The results show that hydraulic press servo system which uses robust compensator has better performance than the traditional PID control and the chattering is eliminated. The test results and simulation results are compared by building simulation test system of 60MN hydraulic press electro-hydraulic proportional control system.

Dongbei waterway in the lower reach of Yangtze River includes three waterway: Hukou waterway, Heng waterway and Zhi waterway. The evolvement trend based on the measured data show that the right branch of Xiasanhaozhou is developed and the shallow shoal at the head of Xiasanhaozhou is scoured along with the right branch be rushed and ratio of diversion flow increase which have negative effect on transition shoals. In order to analysis the effect of evolvement trend on the channel conditions of transition shoals, this paper adopt cognitive calculation on water flow of Dongbei waterway using mathematic model. The results show that, the development of right branch of Xiasanhaozhou and the shallow shoal cutting at the head of Xiasanhaozhou decrease velocity of transition sections, decrease the diversion flow of the left branch of Xiasanhaozhou, and increase the diversion flow of the head of Xiasanhaozhou which have negative effect on transition shoals.

Dongbei waterway in the lower reach of Yangtze River includes three waterways: Hukou waterway, Heng waterway and Zhi waterway. For a long time the documents about the evolution of measured data in based mainly on topographic information and it is insufficient materials actually measured about the character of water flow. In order to make up the incomplete measured documents, it is intended herein to make calculation of character of water flow by means of mathematic model. The results show that, there are overflows to various extents for the side shoal at Sizhouwei under different discharge. It appears crossing troughs in the left to the side shoal at Sizhouwei. The bigger flow velocity of lower shoal and its left rim is possible for being washed out.

The information technology has led to the profound transformation of society, economy and education. Multimedia-assisted language teaching (MALT) is one of important applications of information technology to education. As a modern educational technology, MALT has been widely used and it is the main trend in English teaching at present. In this paper, the author will discuss MALT in English class of junior high school with the emphasis on formative assessments.

Only the preliminary stage of piping process can be simulated by current seepage-erosion coupled piping model. In order to enhance the simulation capability, a modified piping model is presented. Theory analysis shows that the governing equations of the modified piping model have significant advantages in practicality and solution accuracy. The solving process of the model is analyzed, with the result showing that the out-of-bounds appearance of the field variables is the major factor interrupting the solving process. Then a new solution technique called dynamic constraint is proposed, which can ensure the validity of field variables. Numerical example indicates that the new governing equations and dynamic constraint technique can enormously enhance the simulation capability of the model, and the piping process can be effectively simulated.

A new method is put forward to predicting the degree of electrode tip wear based on a laser measurement and digital image of the surface joint indentation. First, in order to monitoring the degree of electrode tip wear, the decline altitudes of sphere ΔH that can indicate variation of electrode tip shape are measured by means of the laser measurement system. Second, through the correlation analysis between the parameters S0, S1, S, K1 reflecting digital image characteristic of joint indentation and the decline altitudes of sphere ΔH, S0, S, K1 are extracted as characteristic parameters of monitoring electrode tip wear. At last, a model of support vector machine (SVM) for predicting the degree of electrode tip wear is established between the parameters S0, S, K1 as the input vector and ΔH as the target vector. Test result shows, the correlation coefficient between model prediction and actual measured values are 0.9907. The prediction model can realize estimating the degree of electrode tip wear.

This article uses the vector space model to express microblogging text in quantity, via the cosine of the angle of text clustering method to calculate the similarity between the text. We can generate alternative microblogging hot cluster by centralized method, by adding the "microblogging impact Factor " into vector text mold of alternative hotspot clusters. In order to simulate the exclusive advantage of "star" in the information dissemination process of the real world, we use the alternative hotspot clusters which already weighted the "microblogging impact factor" to re-evaluate its characteristics of vector, to optimize the hot microblogging discovery algorithm and to make the sorting results more in line with the law of information dissemination, finally to give some suggestions and opinions on hot microblogging evaluation method.

To estimate remaining useful life (RUL) of Li-ion batteries is a key factor for correct and safe battery management, particularly for the development of Battery Management System (BMS). A lumped parameter model which integrates the non-linear open-circuit voltage, current, temperature, cycle number, and remaining capacity and other dynamic characteristics is created based on the battery electrical characteristics is presented. A particle filter (PF) algorithm which syncretizes Li-ion battery electrochemical working process is proposed according to the sequence importance of re-sampling to predict its discharge end time in single cycle time and cycle life. Besides, for comparison, a extended Kalman filter (EKF) algorithm is also proposed to estimate the RUL based on the same statistics. Simulation results show that the PF algorithm according to lumped parameter model has a better precision in estimating RUL compared with the EKF algorithm.

Based on studying the existing electric wheelchairs for disabled are not well adapted to a variety of road conditions, broken through the structure of traditional wheelchairs, a design proposal that can make electric wheelchair achieve the function of climbing stairs and walking was putted forward and a novel mechanism was designed. The mechanism can make the crawler chassis and the wheels of wheelchair switch when needed, and make the wheelchair travel freely and flexible on the ground or on the stairs. The finite element model of the mechanism was built, and the strength analysis was carried out. The strength analysis provide the theoretical basis for the prototype manufacture.

Beginning with the signal remote monitoring system's function structure, development process function design and so on , this paper described the remote management software design and implementation scheme of the road traffic equipment based on the Android mobile terminal. This software can realize the remote control of the traffic signal lights, condition monitoring and signal equipment management and fault alarm to remind function, reduce the maintenance management difficulty of traffic signal control equipment, and have a good application prospect.

In order to provide a theoretical basis for the research on processing tomato harvester, three kinds of processing tomatoes which were largely cultivated and suitable for mechanization harvest in Xinjiang location of China were sampled, and after measuring the red-ripe fruit weight, fruit transverse and longitudinal diameter, the regression equations about the fruit weight and the fruit transverse diameter, fruit longitudinal diameter, fruit shape were established, and the fruit-stem separation force test on the samples was carried out, so the regression equations about the processing tomato fruit-stem separation force and the fruit weight were established. Finally, the mathematical models about fruit-stem separation force and fruit shape of processing tomatoes were built.

The thermal stress analysis of car exhaust manifold is one of the hot research issues. The finite element model of QiRui exhaust manifold was established. Temperature field was gained by using numerical simulation, by mapping the above result as boundary condition of exhaust manifold; the distribution regularity of the thermal stress of QiRui exhaust manifold was gained. The analysis result shown that there serious stress concentration between the reinforced rib and exhaust tube, the maximum stress reached to 330Mpa, which is high enough to destroy the tube. By improving the rib structure, the maximum stress can drop to 280Mpa, and the stress distribution also smoother than the original.

In this study, a high level residential building, Building 1 (Block 1) of Qingheju low-rent community in Jinan, China is used as case for studying energy performance in its different flats under different conditions (levels, positions, opening directions, etc.). IES Virtual Environment (IES VE) is applied as main tool of simulating the building energy performance. The result reveals that flats at lower level, flats on the east side, flats with less area of external walls and openings can save more energy in both cooling and heating in this area.

The main bridge of Yunshi Hanjiang River Bridge is a prestressed concrete extradosed bridge with two pylons, a single cable plane and with span arrangement (128+238+128) m. The main girder of the bridge is the concrete continuous triple-cell single box girder of long cantilevers and variable sections, the box girder is 26.5m wide. The cantilever of girder is 5.75m wide as to reduce the self-weight of main girder. In the design, the software Dr.Bridge was used to establish the finite element model for the box girder and to carry out the global calculation of the girder lateral calculation. The software ANSYS was used as well to establish the finite element model for the segments of the main girder and to carry out the analysis of the local stress of the girder. The results of the calculation and analysis indicate that the global structure of the bridge is safe and reliable and the structure can meet the requirements for highway vehicle riding safety and comfort. No significant local stress concentration appears in the main girder, the stress amplitude values of the stay cables are within 30Mpa, and the structure can meet the requirements for durability in the process of service of the bridge. With long cantilever design greatly reduce the self-weight of main girder and saving cost, at the same time make the bridge look lighter and beautiful. The results of the analysis provide a reference for analysis on the shear lag effect and lateral calculation of the concrete continuous triple-cell single box girder of long cantilevers and variable sections.

With the development of tunnel technology, the number of tunnels becomes huge in some area, and adjoining tunnels turn into tunnel group in some highway sections. So, to ensure the traffic safety, the linkage ventilation control system for the tunnels of the whole highway section is necessary and essential. In this research, obtaining the live traffic information of each tunnel is the key point. This article attempts to build up an intelligent ventilation system which makes traffic flow data of every tunnel available and predictable. The system achieves information sharing and build up weight-based traffic forecasting model. In addition, the composition of fuzzy-logic ventilation control model is introduced. The research might expand the application of intelligent tunnel ventilation control system and could provide references to other linkage ventilation control system of tunnel groups.

On the basis of comprehensive analysis of water supply and the development of social economy in Zhengzhou, analysis of the balance of supply and demand of water resources and water-saving potential in Zhengzhou center city, and identified the water conservation planning target of Zhengzhou City center in 2015, it is concluded that water-saving potential in Zhengzhou City center in 2015 is 3000.28×104 m3; and put forward the countermeasures and measures of saving water from the aspects of industry and comprehensive life, for the water conservation planning of Zhengzhou City center in 12th Five-year to provide the reference basis.

Polyaniline (PANI) composite have generated great interest in the catalyst field due to the coordinate properties of their component. Herein, PANI-PMo12 composite microspheres were successfully fabricated via a facial oxypolymerization with hydrogen peroxide as oxidant and phosphomolybdic acid (PMo12) as dopant. The PANI-PMo12 microspheres were characterized by SEM, XRD, FTIR and XPS. The concentration of PMo12 had a major effect on the diameter of microsphere. The solvent ethanol also played a critical role in the formation of microspheres. The formation mechanism of the PANI-PMo12 microspheres was proposed. Further, the composite microspheres could be directly used as catalyst and displayed a high conversion and selectivity in the epoxidation of cis-cyclooctene with aqueous H2O2 as an oxidant.

Cable-stayed suspension bridge is an unconventional bridge type with a bridge typology based on the combination of both cable-stayed and suspension systems. In this paper, the static behaviors of cable-stayed suspension bridge were revealed from the viewpoint of the structural deformational characteristics under different kinds of live loads. To more clearly illustrate these characteristics, the simplified analytical method based on the simplified analytical solutions for cable-stayed bridges and suspension bridges were adopted in the derivations. Furthermore, the simplified material cost model based on allowable stress method for cable-stayed suspension bridge was also proposed for researchers and designers to adopt in preliminary design stage.

It is described herein the general rule complied with by different forms of rivers by calculation of evolution trend of selected typical reaches of Ouchikou, Wakouzi and Yaojian which are appeared in the middle of Yangtze River, representing respectively the straight branch, minor bending branch and bending branch. The evolution for reaches of straight branches are mainly characterized with moving backward of side shoal by washout, increased swing of main flow, becoming shallow of riverbed and displacement of navigation trough. For minor bending branches, they generally have unstable water courses, frequently swinging thalweg, washout on head part and left and right rims of heart shoal and extended downward of deposit at the end. Because of reduced sand content, main courses and branches are in the trend of washout. As for bending branches, it is generally stable because of shore protection projects and the navigation condition is better than other type of river reaches unless there is sharp cutting of protruding side shoals.

The wheel-rail contact is a boundary condition highly nonlinear complex problem, which need to accurately track the wheel-rail movement and the interaction contact stress between wheel-rail before and after the occurrence of wheel-rail contact, nonlinear contact stress of wheel-rail is analyzed through the contrast of finite element analysis and the actual detection, the experimental and theoretical calculation results show the compliance of the finite element model of wheel-rail, at the same time also point out some differences of theoretical calculation and actual manufacturing, which establish the theoretical and experimental foundation for the advanced research movement friction etc..

By using MIKE21SW module to simulate the waves, the paper explores the influence of bottom friction parameter and wave breaking parameter on wave height and wave period. The law for future MIKE21 parameter calibration is summarized.

The structure of bogie frame is meshed by hexahedral and tetrahedral elements respectively. FE analysis is taken based on the loads defined by JIS E 4207 standard and the stress distributions of two separate models are obtained. To clarify the accuracy of two kinds of finite element models, the bench test of the bogie frame is carried out. It shows that both the hexahedral and tetrahedral models are valid according to the comparison between FE results and experimental values when the structural model is regular. However, for complex structure model 10-node tetrahedral model takes precedence.

Indoor temperature model is one of the large time-delay controlled object, and the response performance of system get worse. In consideration of the Fuzzy PID controllers strong robustness, this article adopts a Fuzzy PID-Smith control method ,and the control effect proves to be good.

A 16-bit multi-channel simultaneous sampling ADC of wide analog input was designed. This ADC had a maximum conversion rate of 250[kSPS]. The ADC was implemented in 0.6[um] 2P3M standard CMOS process+high voltage CMOS process. For ±10 [V]/10[kHz] sine analog input and 250[kSPS] sampling rate, the testing result of the ADC at room temperature is that INL is 1.7[LSB], SINAD is 85.3[dB], EFS-is 0.055[%FS], EFS+ is 0.039[%FS].

Stress analysis of the bolts used for Φ1.3m parabolic antenna was conducted in this article, and the strength of bolts was checked, the results indicated that the bolts can meet the strength requirements. This calculation result was verified by the static load experimental test of Φ1.3m parabolic antenna, and the experiment results agreed well with the calculation results. The calculation and verification methods provided a reference for the structure design and bolts strength check of the same type of antenna.

Autofrettage process is now widely used to improve fatigue strength of high pressure components. This paper focuses on the fatigue life improvement of the high-pressure cylinder treated by autofrettage process. In this process, a high pressure cylinder treated by autofrettage process has been simulated by using FEA software, and surface variation of the cylinder has been analyzed. To further understand this process, theoretical fatigue analysis has also been carried out.

Tractor SX4187NT361K, which is manufactured by the Shaanxi Automobile Group Limited Corporation, is regarded as a prototype vehicle. This paper investigates an 1/4 car model with air springs for the tractor and a working model of air spring. A height PID control method for ECAS is designed, and its digital simulation is conducted. An ECAS test-bed is designed, and hardware of a measurement and control system for the test-bed is designed with DSPACE system, its softwares are also designed with Simulink and ControlDesk. Finally, active and passive tests of the ECAS are conducted through changing frequencies and desired heights, simulation and test results show that the PID height control method for ECAS is feasible.

Insect-like flapping-wing aircraft is a research focus in the study of Micro Aerial Vehicle. In the paper, a cicada is chosen as the object, and based on the analysis of its wing, its kinematics and three-dimensional model are researched. In the study of kinematics, two softwares (Movias-pro and Photoshop) are applied, and the laws of flap and torsion movements are obtained. In the study of three-dimensional mode, the wing is scanned by the use of flat plane scanning method, and the resulting picture is vectorized. Based on the wing datum, the three-dimensional model of wing is created by the use of Pro/E. The result from the paper lays foundation for the development of cicada-like flapping-wing aircraft.

This research mainly investigates the control time sequence in the open circuit double-pump hydraulic system of the concrete pump. The control time sequence is the electrical signals given to the two pumps and the pilot valves of the two main valves. Under the signals’ control, the valves are switched and the flowrate of the two pumps becomes low during the valve switch in order to save energy and reduce the impact pressure. According to the actual hydraulic components, the simulation models about two main hydraulic circuits which are pumping circuit and distributing circuit including directional valves, the pump with the function of constant power control with pressure cut-off and electrical stroke limiter, the two pumping cylinders with cushion structure and distributing structure are developed with software AMESim. On the basis of the two circuits model, an integrated simulation model is developed. Having been validated by the pumping water experiment, the simulation model is used to simulate different control time sequence. Based on the analysis of these simulation results, a proper control time sequence which ensures the pumping system has higher pumping efficiency and longer cylinder stroke is achieved.

Crane runway girders are subject to cyclic loads, stress variation in the girders is a certainty. In this paper, Fatigue is investigated for the metallurgical bridge crane structure and an explanation of the concepts and design methods are provided. The fatigue test & analysis was carried out in the middle of girder bridge crane cover& its rail web, and the fatigue life of these Measuring points was calculated according to EN 1993-1-9:2005 Part 1-9, the result is consistent with the fatigue assessment result for bridge cranes Using MSC.Fatigue software ,which represents a strong practical significance.

The economic phenomenon of high urban housing prices in our country reflects asymmetry of rights and interests among government, real estate developers and buyers in essence, and behind this economic phenomenon imbedded financial crisis as well as political and social crisis. Regarding academic thought on the causes of high housing prices in the real estate market such as the theories of supply anddemand, cost, the system, and power imbalance between interest groups, this thesis proceeds institutional analysis, from the perspective of institutional economics, discusses the institutional causes of the persistent existence of four factors theories in the angle of vacancy of civil rights in the supply process of institution and rules, and puts forward policy suggestions of increasing effective supplies of institution in the system level.

In this paper, we propose a method to solve the problem of parting pages of comics and rear-ranging the consequential partial pictures. It is enable portable devices with small screens to display large page format comics. After being divided into single pictures segmentations, large pages are rearranged in an appropriate way for watching in small screen. The key work in segmentation process is to segment large format comic pages by unicom domain detection. And then the method examined by examples of common comics, proving that the algorithms are effective for comics with integral frames and nearly rectangular partial pictures. We also discuss the picture sequence-restructuring problem with empirical prediction method. Experiments are analyzed by this method and the results of which validates the feasibility of the proposed method.

Based on site investigation data and historical data of characteristic hydrological years in Tigris River, the natural conditions and sediment environment were analyzed, a 2D mathematical model of flow and sediment was used to analyzed the intake schemes in Wassit power station (4×330MW). The calculation results based on the data of flow and sediment in representative year show that the erosion and deposition will occur in the region of water intake engineering. So the reasonable design parameters related to water intake by pump vessel should be provided by designer.

From the analysis of the character of elastic wave through a rock medium, According to the safety driving problems faced in tunnel construction geological prediction, using TSP test data inversion of rock hardness, integrity and water characteristic parameters, the determination model of surrounding rock classification based on the variable fuzzy sets for surrounding rock classification. You can use the existing geological forecast means the achievements, with no increase in the additional cost method, the use of advanced, scientific method, in situ on surrounding rock grade determination, not only reduced the economic investment, and reduce the detection procedure, which have greatly improved invest. From detection technology investment and time efficiency compared to the original method, to guide the construction, save the cost, construction scheme design plays a positive role. This method not only has the profound theory value, but also has significant social benefits and huge economic benefits.

An exact analytical model of Halbach arrays permanent-magnet (PM) motor is established for the calculation of air-gap magnetic field on load in this paper. The exact analytical method is based on the resolution of Laplaces or Poissons equations by applying the boundary conditions on the interface between each sub-domain: air-gap, Halbach arrays and slots. The waveforms of no-load magnetic field flux density, back electromotive force (EMF), armature reaction field flux density, air-gap magnetic field flux density on load and electromagnetic torque, which computed by the analytical method were validated through the finite-element method (FEM).

A new frog-leg winding permanent-magnet (PM) brushless DC motor is proposed in this paper. Besides PM excitation and electric commutation, the motor has a type of mesh winding inherited from the conventional brushed DC motor. With the aid of a position sensor, the new motors operation principle is basically as same as the brushed one. Based on the frog-leg winding configuration of simplex lap and duplex wave, the motor is designed with 4 poles and 22 slots, and the number of phases is set as 11. Furthermore, an exact analytical method for predicting the instantaneous magnetic field, electromotive force (EMF) induced in the armature winding, cogging torque and output torque of the new motor is introduced. Results from this analytical method are compatible with corresponding finite element analyses (FEA).

Fire overflow on exterior wall with thermal insulation system has been studied by numerical simulation. The spread laws of fire overflow are analyzed through the temperature distribution near the window. The computational results are compared with those of test in the Exterior Insulation Fire Barrier Technical Guidelines (EIFBTG). It has been found that the calculated maximum temperature points is closed to the test on the first floor, the first ceiling, and the points near the above two windows. However, there are differences between two kinds of results above two floors and ceilings, and the points near the first window. It has also shown that when the HHR is 7.5KW, the scope of damage of exterior thermal insulation layer is about 15 square meters near the window. The research would provide reference for fire protection design of exterior wall thermal insulation in the high-rise buildings.

In view of the present domestic demand with data processing technology of seismic while drilling, a set of software system suitable for data processing of seismic while drilling was developed. The software was based on the hierarchical structure and the article described the architecture of the seismic while drilling data processing software system. It also defined the function at all levels in detail. The results showed that: the software system based on the hierarchical structure is stable and has good adaptability and extensibility.

This paper analyzes the three major problems exist in the long-term use of hydraulic coupler, a temperature rise effect is the hidden trouble of the normal operation of equipment; two is the site difficult to accurately control the charging liquid, starting power balance and shutdown can not control the scraper conveyer; three is the property of medium effects factors of hydraulic coupling torque; introduces the working principle of asynchronous magnetic coupling and unique five technical characteristics. The asynchronous magnetic coupling and hydraulic coupler has obvious technical advantages compared, can solve the long-standing hydraulic coupler in the production practice expect to solve urgently and has failed to solve the problem. Conclusion is the soft starter for asynchronous magnetic coupling for scraper conveyor is completely feasible.