![]() The piezoelectric stack actuator has the advantages of high energy conversion efficiency, low operating voltage, and large output force. The active control element adopts a piezoelectric stack actuator with a mechanical displacement amplifying mechanism. This chapter discusses an active-passive composite vibration suppression system based on piezoelectric actuators. In order to improve the vibration suppression effect, it is usually required that the piezoelectric actuator can output a sufficiently large displacement and control force at the same time, but its realization is limited by the electromechanical coupling characteristics of the piezoelectric actuator. That is, when the piezoelectric actuators are arranged, the direction of the output force/displacement of the actuators is consistent with the direction of the system vibration. Most of the active suppression methods based on piezoelectric actuators reduce the vibration by directly suppressing the excitation force. They have been widely used in active vibration suppression systems. As actuators, they have many advantages such as fast frequency response, wide control frequency range, high displacement resolution, small size, easy integration, no mechanical friction, and so on. Among them, the piezoelectric materials can be used as both actuators (inverse piezoelectric effect) and sensors (positive piezoelectric effect) due to their positive and inverse piezoelectric effects. At present, the smart materials used in the design of active vibration suppression actuators mainly include electro/magnetorheological fluids, shape memory alloys, magnetostrictive materials, piezoelectric materials, and so on. In recent years, the development of smart material structures has provided conditions for the development of actuators, which has greatly promoted the research and application of active vibration control technology. ![]() The actuator is one of the key elements that affect the vibration suppression performance of the entire active vibration suppression system. The active control strategies currently used in the field of vibration suppression include PID control, adaptive control, intelligent control, and so on. One is the study of active control strategies the other is the study of new materials and corresponding actuators. The active vibration suppression system is composed of sensors, actuators, and control systems, so the current research mainly focuses on two directions. Therefore, the active vibration suppression system with active adjustment capability and wide adaptive frequency range has become a research hotspot. The system has high reliability but cannot adjust the vibration suppression characteristics and cannot adapt to changes in the external environment. The passive vibration suppression system commonly used in the engineering field achieves the purpose of vibration suppression by installing elastic damping elements to consume and absorb vibration energy. Therefore, suppressing the unfavorable vibration response has become an urgent problem to be solved in the industry. ![]() In severe cases, it will also lead to fatigue failure and shorten the life of the structure or cause resonance to damage the structure. Strong vibration will affect the accuracy and stability of mechanical parts. Superior lifetime of our actuators is guaranteed with the patented ceramic-encapsulated multilayer production process.Mechanical vibration exists in various machines in working conditions, such as precision machine tools, aircrafts, ships, etc. This group is specialized in research, design and manufacture of piezo materials and components for motion control. ![]() We currently employ 180 staff at our piezo ceramics division " PI Ceramic". PI offers the largest selection of standard and custom piezo actuators and engineered subassemblies. They provide efficient force generation because no conversion from rotary to linear motion and no gears or mechanical other parts that require maintenance or lubrication are involved. Piezoelectric actuators (also known as piezo transducers, or piezo translators) are based on the piezoelectric effect and convert electrical energy directly into linear motion with virtually unlimited resolution.
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