Search

The high-frequency voltage injection method of pulse vibration in the range of zero/low speed to medium-high speed has to be demonstrated for new energy vehicles., because it is very necessary and necessary to control the safety performance of the whole vehicle without speed sensor. The permanent magnet synchronous motor starts slowly to circle when the clean - energy vehicle cranked, and the correctness of the rotor’s startup position identification is significant. In order to achieve high-performance control of permanent magnet synchronous motor without speed sensor, this paper focuses mainly on how to estimate the rotor position of permanent magnet synchronous motor by amplifying the mathematical model of the motor. The high-frequency mathematical model of the permanent magnet synchronous motor’s voltage parameters are attained in the process of maintaining the motor’s preoperational position to address the problem of self-adaptability between the injected voltage and the likely phase current. The initial position identification of the rotor of a permanent magnet synchronous motor can be achieved by optimizing the adaptive method, and the pulse vibration highfrequency voltage anesthetic method also shows better efficiency and safety when the motor achieves a stable start and has sound output torque. The struggling to retain adaptive measurement device vibration high frequency voltage injection approaches is used by the light-duty low-speed new energy vehicle, which may minimize the mechanical speed sensor after becoming damaged, save the cost and improve the compactness of the electric vehicle space design, which is conducive to solving the situation of energy shortage in my country and alleviating environmental pollution. This is in line with the future development concept of society.

In order to solve the intelligent production and management level of assembly parts and components production line, a data acquisition and monitoring system scheme is designed to collect key parameters in the product production process, such as vibration strength (amplitude) information, concrete weight information, temperature information, humidity information, energy and other data. The scheme can realize the functions of on-site data display and processing, dynamic monitoring of equipment status and so on.

Due to the national mandatory requirements for building assembly rate, more and more production enterprises have invested in prefabricated building component production. Because of the low intelligence of production line and the lack of advanced production management system, the problems of component production in terms of standard, quality, efficiency and energy consumption are gradually revealed. Based on the information management, combined with the new generation of information technology, this paper studies the technology, functional requirements and system architecture of MES system of intelligent production line, in order to promote the fine management and information management and control of PC intelligent production line.

Based on the dynamic theory, taking the timing chain system of an engine as the research object, the dynamic characteristics of the contact force between the chain and the components, the swing of the chain and the friction work at idle speed of the chain are analyzed respectively. And the influence of the structural design parameters on the abnormal noise of the engine is obtained. Thus, the optimization scheme of the timing chain system is proposed according to the analysis results.

The mechanical properties of plastics are obtained through material tests. The strength characteristics of the plastic middle console structure of a terrain vehicle under the vibration loads on the pavement are simulated by using the finite element analysis theory. On this basis, the morphology optimization technology is used to improve the structure. Meanwhile, the model is redesigned and verified according to the optimization results, which solves the problem of insufficient strength of the original structure. It provides an effective reference for the design of plastic structural parts of similar vehicles.

With the rapid development of modern science and technology in China, the technology of remote sensing transmission of real scene shooting by UAV has been widely applied and the technology has been continuously mature. UAV can realize flexible, light, fast and high-altitude operation. Moreover, UAV can apply real scene modeling technology to integrate the shooting content and realize accurate modeling of real scene to be shot through remote sensing mapping, which can meet the overall application standard requirements of technology. This paper will analyze the remote sensing mapping and modeling technology of UAV, study the advantages and disadvantages of real scene modeling technology of UAV as well as the extended application mode operation of real scene data modeling and ground channel fusion in order to continuously strengthen the comprehensive construction level of real scene modeling of UAV technology.

Based on the basic theory of thermodynamics and finite element, the thermal characteristics and structural mechanics simulation are carried out taking an automobile IGBT packaging module as the research object. Then the distribution of temperature, thermal stress and deformation of IGBT are obtained. The thermal force coupling performance of the structure is judged according to the analysis results, so as to provide theoretical reference for the design and selection of subsequent radiators.