钢丝绳隔离器在小周期负荷下对振动隔离的刚度硬化效应
Mingyang Fu1,2, Zhenyu Yang1,2
1Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150000, China.
Materials (Basel, Switzerland)
|October 26, 2024
概括
电缆绳隔离器 (WRI) 设备在重复负荷下表现出稳定的歇斯底里,硬度随周期对数增加. 对于有效的振动隔离,应考虑这种硬度增加,范围为10-30%.
科学领域:
- 机械工程 机械工程
- 材料科学 材料科学 材料科学
- 振动分析 振动分析
背景情况:
- 电缆绳隔离器 (WRI) 设备对于工业设备的振动降低至关重要.
- 最初的刚度是WRI隔离效率的主要参数,但在负载下观察到非线性行为.
- 制造商通常只提供初始的WRI参数,忽视在操作条件下的变化.
研究的目的:
- 在重复加载条件下调查WRI设备的机械行为和刚度变化.
- 分析负载幅度,加载速度和预加载对WRI性能的影响.
- 为更准确的WRI有效性评估提供数据.
主要方法:
- 在不同的振幅,加载速度和预加载下测试五种WRI样本类型.
- 应用大对称的压缩和张力负载来观察hysteresis.
- 应用小循环负荷与大预负荷来研究刚性演变.
主要成果:
- 在重复负载下,WRI设备表现出稳定的歇斯底里曲线,独立于加载速度.
- 随着周期数的增加,WRI 刚度以对数的方式增加,在 50 个周期后增加 10-30%.
- 最初的刚度随着预负荷线性下降,随着循环负荷线性下降;硬化系数与负载能力相关,但与预负荷和循环负荷振幅相反.
结论:
- 随着周期性负载,WRI的刚度显著增加,这种现象通常不会被制造商考虑.
- 观察到的刚度增加需要考虑动态行为,以准确评估振动隔离效率.
- 了解预负荷和循环负荷下的刚性演变对于优化WRI设计和应用至关重要.
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