tailieunhanh - Mechanical Systems Design Handbook P12

Semi-active (SA) suspensions are those which otherwise passively generated damping or spring forces modulated according to a parameter tuning policy with only a small amount of control effort. SA suspensions, as their name implies, fill the gap between purely passive and fully active suspensions and offer the reliability of passive systems, yet maintain the versatility and adaptability of fully active devices. | 12 Semi-Active Suspension Systems Introduction Nader Jalili Vibration Isolation vs. Vibration Absorption Classification of Suspension Systems Why Semi-Active Suspension Semi-Active Suspensions Design Introduction Semi-Active Vibration Absorption Design Semi-Active Vibration Isolation Design Adjustable Suspension Elements Introduction Variable Rate Dampers Variable Rate Spring Elements Other Variable Rate Elements Automotive Semi-Active Suspensions Introduction An Overview of Automotive Suspensions Semi-Active Vehicle Suspension Models Semi-Active Suspension Performance Characteristics Recent Advances in Automotive Semi-Active Suspensions Application of Control Techniques to Semi-Active Suspensions Introduction Semi-Active Control Concept Optimal Semi-Active Suspension Other Control Techniques Clemson University Introduction Practical Considerations and Related Topics Semi-active SA suspensions are those which otherwise passively generated damping or spring forces modulated according to a parameter tuning policy with only a small amount of control effort. SA suspensions as their name implies fill the gap between purely passive and fully active suspensions and offer the reliability of passive systems yet maintain the versatility and adaptability of fully active devices. Because of their low energy requirement and cost considerable interest has developed during recent years toward practical implementation of these systems. This chapter presents the basic theoretical concepts for SA suspensions design and implementation followed by an overview of recent developments and control techniques. Some related practical developments ranging from vehicle suspensions to civil and aerospace structures are also reviewed. Vibration Isolation vs. Vibration Absorption In most of today s mechatronic systems a number of possible devices such as reaction or momentum wheels rotating devices and electric motors are essential to the systems .

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