自由活塞斯特林制冷机动力吸振器设计及实验研究

Design and Experimental Research on the Dynamic Absorber of Free Piston Stirling Cooler

自由活塞斯特林制冷机(FPSC)中动子组件高频运动,产生一定的整机振动力,会影响制冷机工作性能并限制其应用,因此减振技术是FPSC的关键技术之一。本文对一台280 K@300 W斯特林制冷机动力吸振器进行设计,包括减振弹簧型线设计、结构形式选择、三种型号吸振器的质量刚度匹配、模态分析以及扫频验证实验。模拟及实验结果显示,b型吸振器的固有频率设计值、模拟值、实测计算值分别为79.98 Hz、79.56 Hz、80.95 Hz,而实验值为77 Hz,误差分别为3.8%、3.3%、5.1%,质量比约为0.09,满足低振动及轻量化要求,为此,优选b型吸振器作为斯特林制冷机的减振方案。

The high-frequency motion of the mover assembly in the Free Piston Stirling Cooler(FPSC)produces a certain vibration force of the whole machine,which will affect the performance of the cooler and limit its application.Therefore,the vibration reduction technology is one of the key technologies of FPSC.A 280 K,300 W Stirling cooler power absorber was designed,including the design of the damping spring profile,the choice of structural layout,the matching of the mass rigidity of the three types of absorbers,the modal analysis and the frequency sweep verification experiment.The simulation and experimental results showed that the natural frequency design value,simulated value,and measured value of the model b absorber were 79.98 Hz,79.56 Hz,and 80.95 Hz,while the experimental value was 77 Hz,and the errors were 3.8%,3.3%,and 5.1%,respectively.The mass ratio was about 0.09,which met the requirements of low vibration and light weight.The b type vibration absorber was preferred as the vibration reduction solution of the Stirling cooler.