No abstract

Aiming at the complexity of kinetic analysis of spatial mechanism by analytical method, an analysis model is established in 3D Cartesian coordinate system. By mathematical modeling and algorithms, relationship formula of motion parameters is set up and the solutions of angular displacement, angular velocity and angular acceleration are obtained. Through computer-aided tools, the corresponding curves are plotted, even the correctness of analytical method is validated. In virtual prototype environment, the same analytical results are presented, giving above conclusions a convincing support. This dissertation actualizes the effective kinetic analysis of spatial RSSR mechanism and has valuable reference to the parametric analysis and design.

The operating performance of micro-gyroscope may be easily influenced by various factors, which changes the dynamic response accordingly. Generally, the influences can’t be quantified because of the complexity, and the accurate sensitivity and linearity measuring of micro-gyroscope meets enormous difficulties. In order to accomplish corresponding measuring and analysis accurately and efficiently, input excitation waves are designed based on mathematical analysis of the measuring principles and vibration response, and each measuring of sensitivity and linearity can be analyzed in a single test. In this way, the influences from manual operation and variation of measuring environment are well eliminated, and some key parameters of the dynamic response are obtained, such as sensitive voltage, response function, linearity error, etc. In addition, problems about imbalance in double drive vibration, design of the minimum excitation voltage and evaluation of the measuring error are also described. Therefore, some important references are provided for subsequent design, experiment and engineering application.

Micro-gyroscope is a typical representative of MEMS development, and relative measuring and testing may acquire some important performance parameters, which facilitate analysis and mastery of the operating characteristics further. However, accuracy and reliability of the results or data from measuring system become the key problem for almost all measuring systems. Based on results produced by micro vision measuring, principles about driving and operating of micro-gyroscope are analyzed, and the theory function between input excitation and vibration response is established. With further study on the whole process of dynamic response analysis, resonant amplitude and frequency are finally defined as two decisive factors influencing the accuracy of micro-gyroscope measuring system. Focusing on experiment design and calculation analysis of the two parameters, accuracy and reliability of the system are well verified, which presents important references for other relative measuring systems of micro-gyroscope.

Thermal performance determines the normal operation of electronic circuits and power devices. The required cooling capacity is always increasing with the abroad application of electronic system. Especially in high frequency and large power fields, the defection of fan-cooled radiator comes out. By comparison, liquid cooling system possesses better heat stability and conductivity, which not only improves the stability of system, but also reduces the working costs greatly. Cooling capacity of heat sink is mainly determined by the inner mechanical structure, it is necessary to study the different influences of related structure, so as to guide the structural design of heat sink effectively. Based on thermal analysis by changing a single structure parameter, the structural influences on thermal performance are discussed, and the acquired conclusions are of great importance in thermal design practice of heat sink.