Abstract
The conventional multi-rate spring with high-static-low-dynamic (HSLD) stiffness may not apply to massive payload low frequency vibration isolation due to the poor lateral stability of the spring with pre-compression. The new type of multi-rate spring refers to as a kind of liquid spring consists of a hydraulically driven spring and several pre-compressed slave springs. The payload is supported by the piston of the liquid spring, and the excitation force from the payload is transferred to the pistons of slave springs by hydraulic pressure. The liquid spring shows an HSLD stiffness property. It is found that the proper design of pistons’ cross-section area and the number of slave springs of the liquid spring can achieve an ideal piecewise linear stiffness property. Moreover, the slave spring owns better lateral stability under the condition that both the conventional multi-rate spring and the liquid spring have the same stiffness property. The lateral stability of a pre-compressed linear spring and the stiffness model of the liquid spring have been investigated.
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