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A finite element model which contains one sixth of the IGBT module based on a real test chip of IGBT module is established to investigate the temperature and stress distribution of different shape bonding wire. The finite element (FE) analysis which coupled electro-thermal and thermal-mechanical are conducted using commercial software ABAQUS. The thermal performance and stress distribution of IGBT...
As the demand of power converter for higher power density is increasing, bonding wire failure of IGBT module becomes more severe. Accordingly, it is of great significance to investigate the reliability of bonding wire under operating condition for improving the reliability of IGBT module. In this paper, the finite element model of IGBT module was established, and a two-step indirect coupling electro-thermal-mechanical...
Insulated gate bipolar transistor (IGBT) operates at high current, high power and repeated shock current conditions. Joule heating induced during high current conditions, subsequently raising the temperature of the IGBT module. In this paper, we carried out the DC power cycling test with the 200 A current condition. The temperature distribution and the temperature change process of the whole IGBT...
Axial piston pump is very important in the hydraulic system, and its health affects the entire system directly The wear and tear of the port plate pair is the main reason for the decrease of the axial piston pump pressure and flow rate. Therefore, the degradation test of the cylinder with the flow port plate pair and the port plate is studied. The wear and degradation trend of the port plate pair...
Current densities of 1.5ASD and additive concentrations of 15ml/L were used to electroplate the copper into TSV to fabricate the test samples. The samples were annealed at 425°C for 30 minutes in a vacuum furnace with the heating rate of 10°C /min. The annealed samples were thermal cycled with temperature range (25∼325°C), heating & cooling rate (10 °C/min), dwell time of 2 min at the peak and...
The traditional reliability test of hydraulic components is time-consuming and low efficiency with high energy consumption, so we propose a novel parallel energy-saving reliability test method to improve the performance. By increasing the sample type and sample size of the single reliability test, the test time can be shortened and the energy can be recycled for many times. The design considerations...
The combined focusing deflection system is the fundamental part of the electron beam welding system. An improved 12-pole magnetic deflector applied to the combined focusing deflection system is designed and calculated, which can generate a strong deflection field. From the simulation results, this improved deflection system meets the requirements of high scanning frequency and large scanning field...
According to the body structure characteristics of transporter for large-scale wind turbine blade and the deficiency of traditional steering system, a new trailer steering system was designed. The mathmatical model of steering system was established, then it was optimized by MATLAB optimization toolbox. The application of the optimized system improves the steer performance. The design and optimization...
In view of the requirement of improving mining's efficiency and explosion-proof in coal-mine. A style of advanced full hydraulic separate transportation platform-WC80 has been designed and developed. The maximum rated load of WC80 platform is 80 ton, which can cooperate with many kinds of laneway to complete transportation of equipments, such as successive mining equipment, rockbolting machine, hydraulic...
Using the energy transfer characteristics of the hydraulic pulsation system, this paper designs the basic hydraulic isolation devices. The systematic simulation analysi of inputting different parameters to the seismic wave shows that this system has a certain reduction on seismic wave input. The function can be used in structural control system.
Aimed at the key part for WC80Y separate transporting platform applied in carring successive coal-mining equipment in laneway, the operational principle of steering system was explained and the variable element PID closed-loop control system was set up which including variable displacement pump, proportioning valve steering mechanism and encoder on the base of CAN bus. Based on the field test result,...
Order to meet the needs of construction of high-speed railway passenger dedicated line, 900t rubber-tyred girder hoister is researched and manufactured. Steering system of the hoister is controlled by electro-hydraulic proportional displacement control system, and segment-PID control strategy with dead zoon is used. However with the passage of time, steering performance of girder hoister begin to...
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