齿轮传动环向铅剪切阻尼器的试验研究与数值模拟

Tests and numerical simulation for GD-CSLD

金属屈服型阻尼器通常存在疲劳损伤后需要更换和不易满足大行程要求的问题,提出一种齿轮传动环向铅剪切阻尼器(GD-CSLD)。基于铅材常温动态回复再结晶性能,并通过齿轮齿条配合使该阻尼器具有理论上无疲劳损伤及无位移上限的优良特征。根据核心耗能部件的构造对3个不同剪切轴截面的模型试件进行了数值模拟和试验研究,选择最优剪切轴截面方案设计加工了GD-CSLD,通过性能试验对该阻尼器的滞回性能、疲劳性能进行研究。基于有限元分析和试验结果,对该阻尼器耗能机理进行分析。结果表明:该型阻尼器滞回性能稳定,可实现大行程加载,多次加载后基本无疲劳损伤效应;其耗能机理包含铅材屈服和侧向钢-铅摩擦两部分,且两者贡献基本相同。

Metal yield damper usually needs to be replaced after fatigue damage and is not easy to meet the requirement of large stroke.Here,a gear drive-circumferential shear lead damper(GD-CSLD)was proposed.It was shown that based on dynamic recovery recrystallization performance of lead at room temperature,GD-CSLD has excellent characteristics of no fatigue damage and no upper limit of displacement in theory through gear-rack fit.According to the structure of core energy dissipation components,tests and numerical simulation for 3 model specimens with different shear shaft sections were conducted.The optimal shear shaft section scheme was selected to design and process GD-CSLD.The hysteretic performance and fatigue performance of the damper were studied through performance tests.Based on the finite element analysis and test results,the energy dissipation mechanism of the damper was analyzed.The results showed that the hysteretic performance of GD-CSLD is stable,it can realize large stroke loading,and there is basically no fatigue damage effect after repeated loading;its energy dissipation mechanism includes two parts of lead material yield and lateral steel-lead friction,their contributions are basically the same.