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Vibration Isolation Optimization of Refrigerator Compressors based on Chaotic Particle Swarm Optimization

Li ChengXi

2018, 38 (4): 27-33. DOI: 10.3969/j.issn.1006-1355.2018.04.006

Abstract （384）

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Abstract: The parameter optimization of vibration isolation system for refrigerator compressor is closely related to the effects of vibration isolation. A method of natural frequency discrete distribution to optimize vibration isolation was proposed to improve the shortcomings of easily falling into local optimum solution and iterative divergence for traditional optimization design with taking 6-DOF energy decoupling of the vibration isolation system as the objectives, and taking the stiffness of 4 rubber supports as the design variables. The chaos particle swarm algorithm based on penalty function constraints was developed to optimize isolation parameters for the first time. The results showed that optimized distribution of its natural frequencies is more reasonable, and the optimized decoupling ratios in main directions are improved significantly. Furthermore, it was shown that compared to the sequential quadratic programming and genetic algorithm, the particle swarm algorithm overcomes its weakness of converging to local optimal solution, and it is higher than genetic algorithm in terms of energy decoupling ratios. At last, it was verified with dynamics simulation that the proposed optimization method applied to vibration isolation design have both rationality and effectiveness.

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Computer Simulation of Wind Induced RandomVibration on Stay Cables

FANG Zhi-hua;LI Chen

2011, 31 (5): 130-132. DOI: 10.3969/j.issn.1006-1355-2011.05.030

Abstract （1565）

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Stay cable is one of the main components in cable-stayed bridge. Since this component has large compliance, light weight, small damp and low natural vibration frequency, the wind-induced vibration may occur very often. Thus, it is necessary to study the vibration response of the stay cable to the wind load excitation. In this paper, random wind load is introduced to the finite element model of the cable. Wind induced vibration of cables is simulated with the computer. The method is proved economic and effective. It has significance for design of the cable-stayed bridge, and provides a base for further study of wind-induced response control.

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《Improvement of Sound Absorption Characteristics for Thick Microperforated Panels Using Thin Stainlesssteel Fibers》

XU Ying;HE Liyan;CHEN Ting;LI Chen-xi

2010, 30 (2): 146-148. DOI: 10.3969/j.issn.1006-1355.2010.02.146

Abstract （2788）

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Thick microperforated panels (MPP) usually do not have such a good sound absorption feature as the thin panels do because of their high resistance and/or reactance. In order to improve the thick MPPs acoustical performance, thin stainlesssteel fibers are inserted into the orifices of the thick MPP, and their sound absorption coefficients are measured. Results show that the thin stainlesssteel fibers can widen the frequency band for sound absorption of the thick MPP effectively. When the insertion rate of the fibers reaches 50% and the usage of fibers reaches 0.75mg per orifice, the frequency band of sound absorption is 3921168Hz for the absorption coefficient larger than 0.5. While for the MPP without fiber insertion the frequency band for sound absorption is only 5301076Hz.