Fu Mingyang, Yang Zhenyu
Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150000, China.
Earthquake Engineering Research & Test Center, Guangzhou University, Guangzhou 510006, China.
Materials (Basel). 2024 Oct 11;17(20):4983. doi: 10.3390/ma17204983.
Wire rope isolator (WRI) devices are widely used in vibration reduction industrial equipment, and stiffness is the key parameter that determines isolation effectiveness. WRI devices show slight nonlinearity under small loads, and the manufacturers generally only provide the initial parameters. To investigate the mechanical behavior changes in the WRI devices under repeated loads, five types of WRI specimens were tested under various amplitudes, loading speeds, and preloads. The test results of large symmetrical compression and tension loads showed that the WRI devices demonstrated stable hysteresis curves under repeated loads, while the hysteresis curves were independent of the loading speed. The test results of small cyclic loads with large preloads show that the stiffness of the WRI specimen follows the logarithmic law, with the cycle number under various loading conditions. Particularly, the stiffness of the specimen increases by about 10-30% after 50 cycles. The initial stiffness decreases linearly with the preloads, while the decrease is quadratic in relation to the cyclic load. The hardening coefficient shows a positive correlation with the loading capacity of the WRI devices, while it shows a negative correlation with the preload and cyclic load amplitudes. It is recommended to consider the stiffness increase in the WRI devices during the evaluation of isolation effectiveness.
钢丝绳隔振器（WRI）装置广泛应用于工业设备的减振，其刚度是决定隔振效果的关键参数。WRI装置在小载荷下呈现轻微非线性，制造商通常仅提供初始参数。为研究WRI装置在反复加载下的力学行为变化，对五种类型的WRI试件在不同振幅、加载速度和预载下进行了测试。大对称压缩和拉伸载荷的测试结果表明，WRI装置在反复加载下呈现稳定的滞回曲线，且滞回曲线与加载速度无关。大预载下小循环载荷的测试结果表明，WRI试件的刚度遵循对数规律，与不同加载条件下的循环次数有关。特别是，试件在50次循环后刚度增加约10 - 30%。初始刚度随预载呈线性下降，而与循环载荷的关系呈二次方下降。硬化系数与WRI装置的承载能力呈正相关，与预载和循环载荷幅值呈负相关。建议在评估隔振效果时考虑WRI装置刚度的增加。
