Research On Characteristics And Active Control Of Vibration For ATVA Using SMA

With the high precision requirement of manufacturing product is required,the vibration level of environment is more and more restrict,these led people to continue research some new technologies to suppress vibation. A traditional dynamic vibration absorber is simple,and it is effective when the primary system's natural frequency is not changed. But the frequency in many applications or circumstances often changes, so tuning effective stiffness of the DVA to the changes in the primary system's natural frequency is a new requirement for the performance of vibration absorber. Although active control of a vibration absorber can meet the above requirements and shows great potential,but due to the cost and high energy consumption, previous Active Vibration Absorber is difficult to be widely used in practice. A new adaptive tuned vibration absorber incorporating Shape memory alloys(SMA) elements be able to withstand long-term work requirements,and is not sensitive for environment except for tempreture, so it has a good reliability,and is successful in achieving attenuation of tonal vibration of the primary system across a range of frequencies compare to a traditional mass or a stiffness tunable vibration absorber, it is also compact and has a fast response. In foreign countries, active vibration absorber using shape memory alloys has been studying, in our country, the area for researching active vibration absorber using shape memory alloys is still blank.Firstly, the characterization of a traditional dynamic vibration absorber is introduced, and optimized stiffness, damping, mass in MATLAB software; then design and construction of an ATVA incorporating SMA elements are described,results are given for both the characterization of the ATVA as a dynamic system and for the implementation of the device to control the vibration of a primary system.Comparisons with predicted results (SMA ATVA with the traditional dynamic vibration absorber for vibration control)are given;the use of filtered X-LMS algorithm tuned vibration absorber and the primary system coupled system for adaptive filtered feedforward control is discussed,by tuning spring stiffness (control the temperature of shape memory alloys) to supress the primary system amplitude, speed and acceleration. It has been verified that adaptive vibration absorber using adaptive filtering feedforward control strategy is feasibility and effective.This thesis has studied the active vibration absorber using shape memory alloys, providing theoretical basis for the future optimal design active vibration absorber.