Survey of advanced suspension developments and related optimal control applications

Semi-active control systems for seismic protection of structures: a state-of-the-art review

This paper presents the results of a study to evaluate the performance of a number of recently proposed semiactive control algorithms for use with multiple magnetorheological (MR) dampers. Various control algorithms used in recent semiactive control studies are considered including the Lyapunov controller, decentralized bang-bang controller, modulated homogeneous friction algorithm, and a clipped optimal controller. Each algorithm is formulated for use with the MR damper. Additionally, each algorithm uses measurements of the absolute acceleration and device displacements for determining the control action to ensure that the algorithms could be implemented on a physical structure. The performance of the algorithms is compared through a numerical example, and the advantages of each algorithm are discussed. The numerical example considers a six-story structure controlled with MR dampers on the lower two floors. In simulation, an El Centro earthquake is used to excite the system, and the reduction in the drif...

Semiactive Control Strategies for MR Dampers: Comparative Study

https://ro.uow.edu.au/cgi/viewcontent.cgi?article=3667&context=eispapers

MR damper and its application for semi-active control of vehicle suspension system

The protection of civil structures, including their material contents and human occupants, is without doubt a worldwide priority of the most serious importance. Such protection may range from reliable operation and comfort, on the one hand, to survivability on the other. Examples of such structures leap to one's mind, and include buildings, offshore rigs, towers, roads, bridges, and pipelines. In like manner, events that cause the need for such protective measures are earthquakes, winds, waves, traffic, lightning, and-today, regrettably-deliberate acts. Indications are that control methods will be able to make a genuine contribution to this problem area, which is of great economic and social importance. In this article, we review the rapid developments which have been occurring in the area of controlled civil structures, including full-scale implementations, actuator types and characteristics, and trends toward the incorporation of more modern algorithms and technologies.

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Controlling buildings: a new frontier in feedback

A type of force generator which can respond to general feedback signals from a vibrating system in order to control the vibration but which does not require the power supply of a servomechanism is described. Computer simulation studies show that performance comparable to that of fully active vibration control systems can be achieved with the semi-active type of device. Physical embodiments of the concept are discussed and compared to hardware used in active and passive vibration control systems.

Vibration Control Using Semi-Active Force Generators

The system is semi-active and includes a passive isolator and an active damper coupled in parallel between spaced members. The damping characteristics of the damper are actively varied as a function of some control condition such as displacement, velocity, acceleration or the like for generating an actively controllable force resistant to relative movement between the members. The system is particularly useful as a suspension system for reducing the transmissibility of shock and vibratory energy between a mass and support therefor.

System for controlling the transmission of energy between spaced members

An active pneumatic mechanism and a passive hydraulic mechanism of the apparatus are so connected with each other and with a driven member that movement imparted by the pneumatic mechanism to the driven member produces, and is controllable by restriction of, hydraulic fluid flow within the hydraulic mechanism. Restriction of the fluid flow to any desired extent is accomplished by command signals directed by a control computer to a valve that preferably is of the type actuable by a torque motor. The command signals produced by the computer are based upon a correlation of data supplied by a computer program with data supplied by a monitor of the positions of the driven member along its path of travel. Precise control of the speeds, accelerations and positions of the driven member are realized.

Michael J Crosby

Papers

Vibration Control Using Semi-Active Force Generators

System for controlling the transmission of energy between spaced members

Hydropneumatic drive apparatus

Halbaktives system zur kontrolle der energieuebertragung durch stoss oder schwingung zwischen zwei in abstand voneinander befindlichen teilen

Cab Isolation and Ride Quality