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Study the design approach of a micro electric current stimulator, realize to aid in the treatment of insomnia. According to the system analysis of patients with sleep, automatic regulation of stimulation parameters Settings. This way of treatment without side effects caused by drug treatment of insomnia.System uses the low power technology, suitable for battery power for a long time work. Main technical indexes: through the way of bi-phase constant current stimulation; stimulus current: 0 ~ 1mA; exciting frequency: 0.1 ~ 100 Hz; stimulating pulse width: 50 ~ 1000 ms.

In this paper the crashworthiness of a thin-walled column is selected as the optimization goal and its section gauge size parameters are defined as variables. We use Optimal latin hypercube design method and ASA optimization method respectively to define sampling design points and find optimal design in Kriging metamodel, constructed using function values in FEM results at sampling design points. A design space updating method is introduced in this paper to reduce computational consumption and improve accuracy by several rounds of metamodeling and optimization, practice shows that object parameter SEA in each round converge to a final one, constrained by the demand of no weight added. High accuracy and rapid convergence of this method will be verified by comparison between results by this method and FEM.

This article describes a method, based on drum test and performance of drive axle test, to find the distribution of resistance itself and its relationship with speed in whole driveline and drive axle by processing data from the results of test. A related analysis equation can be found by analyzing the power consumption with different torque inputs.

A high-speed data collection and transfer system is designed in this paper. The hardware system is based on EZ-USB FX2 and high speed A/D sampling model based on MAX1198. The frame of hardware is discussed in details. Finally, the solution of software and the firmware flow are provided. The designed system has many advantages such as high-speed, plug and play, easiness to use and expand. It can be used for reference in universal research of real-time and high-speed data transfer system.

In order to prove the applicability of the design approach with complex System-on-Chip (SoC), equipments for real-time electrocardiographic (ECG) signal generator and corresponding algorithm have been implemented in this study. The study mainly focused on completing a SoC design which constructs a customizable system via user interface to an FPGA Chip in accordance with the need of a specific application. In the proposed design flow the architecture of the generated hardware is tailored to match the communication structure of the application. This allows the developer to meet the system's performance, size and power consumption requirements with short time to market. The feature-rich multimedia products can meet market expectations of high performance at low cost and lower energy consumption.

To meet the operating requirements and give full play to the efficiency of thread fasteners, a method to calculate tighten torque was developed on the basis of pre-tightening force-torque characteristic curve. Compared the traditional method depended on empirical values, the method proposed in the paper can not only consider the theoretical analysis, but also combine experiment results. Through calculating the tighten torque of a car engines bearing bolts by pre-tightening force-torque characteristic curve method, and comparing the results and the practical torque value, it demonstrates that the pre-tightening force-torque characteristic curve method can develop more efficiency of the bolt.

To solve the problem of lacking tools for efficiency testing in the process of automotive driveline optimization, a test bench was developed on the basis of adequate study on the properties of the structure of automobile driveline. Using the test technology to carry out efficiency research of automotive driveline, can not only verify the theoretical analysis, but also find an effective way to improve the efficiency of automotive driveline through the processing of testing data. In the past, most of the research for driveline efficiency is limited to the study of automotive transmission, and it is seldom acceptable to take the entire driveline as the research object to study. Adopting modular structure design, this test bench can not only be used to test the efficiency of entire automobile driveline, but also be used to test the efficiency of single components. Testing results shows that the precision of the test bench has achieved the anticipated goal, and the test bench has the advantages of convenient installation and high automation degree, etc.

This paper has made a statistic survey on the failure rate of the appliance of high-power IGBT on the Harmonious locomotive. According to the analysis ,environmental temperature and humidity have a crucial influence on failure rate, thus a set of temperature and humidity monitoring system has been designed to investigate the environment temperature and humidity of high failure rate Four-quadrant IGBT modules, analyzing factors such as temperature and humidity and the working conditions accordingly, exploring the relationship of rising temperature of IGBT ,locomotive speed ,pressure of the air cylinder, setting a foundation for later analysis on the mechanism of troubles.

Based on formulating the minicar transmission efficiency test standard,the test was designed by using dimensional analysis theory. Selected the power loss of transmission system as evaluation index, the effects of parameters such as oil temperature,oil depth of stir oil gear, line speed of stir oil gear, transmission system ratio, input speed and input torque were experimented. It has the advantages of less test times and more design freedom. The test design provides theory basis for the empirical formula which indicates the relationship between power loss and test parameters.