Abstract
Keywords - Vibration, Active Control, Suspension, Truck, Energy Regeneration
Abstract - Active vibration control systems have better isolation performance than passive ones, but require external energy, which is not utilized by passive control systems; making this one of the drawbacks of active vibration control systems. On the other hand, a typical damper absorbs vibration energy, which is rarely utilized; usually being converted into other energy forms such as heat and then dissipated outside.
To solve the active control energy problem, the authors proposed a self-powered active vibration control system that produced a control force using energy regenerated by dampers. Such systems do not require external energy to produce control force. In this study the proposed system is applied to suspensions of a truck. The dampers, which regenerate energy, are installed in the chassis suspension, and the actuators in cab suspensions; achieving active control of the cabin using the regenerated energy. A linear quadric optimal regulator is utilized as the active controller. Electromagnetic dampers, which are composed of DC motors with ball screws and nuts, are utilized as energy regenerative dampers and actuators.
The authors examine the energy balance between regeneration and consumption. An excess of regenerated energy is a necessary condition for the proposed system. These energies depend on the feedback gain of the active controller, power spectral density of the road input and the specifications of the actuators. Mathematical equations to calculate the regenerated and consumed energy are derived. Then relationships between power consumption, regeneration and performance of the active controller are obtained. The results indicate that the self-powered active vibration control can reduce its vertical and pitch acceleration compared with a passive system under the condition that the regenerated energy exceeds consumed energy.