Research on Representative Engineering Vibration Isolation and Control Using Particle Swarm Optimization Technique.

Objective: In this paper, vibration isolation and control for two types of representative engineering equipment are considered, i.e. sensitive equipment and machinery equipment.Design: Isolation designs for the two equipments are carried out, respectively, for the purpose of chasing an optimal strategy and in which latest swarm intelligence—particle swarm optimization (PSO)—technique is adopted.Methods: In the investigation of single-stage system for sensitive equipment, transmissibility of displacement of equipment and relative displacement between equipment and foundation show that this design cannot obtain a desired isolation effect, but an implementation using multi-objective PSO (MOPSO) technique can overcome this when both the objectives are balanced. Then a two-stage system is investigated, and the transmissibility indicates that the disadvantages can be effectively eliminated, and the obtained gbest solutions using MOPSO can prove this. Based on the two-stage passive isolation, active control is proposed for better vibration attenuation, which is focused on H∞<inline-graphic></inline-graphic> criterion, and the control outputs are consisted of multi-objective fitness functions, and the latter strategy can seize the control effect of the two objectives well compared with the single-objective PSO-based H∞<inline-graphic></inline-graphic> control. Following the strategies for the sensitive equipment, similar strategies for machinery equipment are performed promptly. In the single-stage system, transmissibility derivations of transmitted force to the foundation and inertial force of equipment are same with the ones of displacement and relative displacement of single-stage design of sensitive equipment; in addition, chunk foundation is often utilized for machinery equipment, and the vibration of which should be taken into consideration. In view of these, a two-stage system is proposed, and the transmissibility indicates a drift for entering into the desired isolation region is feasible and the MOPSO-based validation is presented. After this, active vibration control is also investigated, and a multi-objective control using H∞<inline-graphic></inline-graphic> method is also performed using MOPSO, and the validations further confirm the importance and necessity of a multi-objective control.Conclusion: Single-objective and multi-objective vibration controls should be taken into account for sensitive and machinery equipment, by which a balanced and optimized control can be performed. [ABSTRACT FROM AUTHOR]