Search

Taking the total average friction work of crankshaft bearings and the mass of crankshaft as objectives, a multi-objective integrated optimization is conducted on the crankshaft bearings of a four-cylinder engine by using particle swarm optimization (PSO) algorithm with exponent decreasing inertia weight strategy. The results are compared with original engine and the results of single objective optimization, and it is shown that after multi-objective integrated optimization, the total average friction work of crankshaft bearings decreases by 26.2 % and the mass of crankshaft reduces by 5.3% compared with original engine, and it has also a slight improvement over the results of single-objective optimization. [ABSTRACT FROM AUTHOR]

The design of automatic headlight adjustment system based on design for quality technique is presented in this paper. Firstly a modification design is conducted on the system to make it adapted to the structure of present step motors. Then the driving parameters of step motor are adjusted to effectively prevent the adjusting mechanism from getting stuck, and further a tolerance design is performed to achieve the uniformity of backlight adjustment and the reliable work of adjusting system under adverse conditions. Finally both bench and real vehicle tests validate the results of system improvement. [ABSTRACT FROM AUTHOR]