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Wu L.-G.,Ningbo University | Duan X.-C.,Ningbo Tuopu Steering System Co. | Huang X.,Ningbo Tuopu Steering System Co. | Xu C.,Ningbo Tuopu Steering System Co.
Zhendong yu Chongji/Journal of Vibration and Shock

A semi-active engine mount (SEM) with switchable stiffness decoupler was designed and manufactured, and its dynamic characteristics were measured with MTS 831 servo-controlled hydraulic test rig. A linear lumped parameter (LP) model for the SEM was proposed. The dynamic stiffness and loss angle of the SEM under high amplitude and low frequency excitation were calculated using the linear LP model. The results had a good agreement with the test data, which validated the proposed LP model. Some applications of SEM for solving NVH (noise, vibration and harshness) problems in auto mobiles were illustrated. The presented conclusions were helpful for design and development of SEM. Source

Shangguan W.-B.,South China University of Technology | Shangguan W.-B.,Ningbo Tuopu Steering System Co. | Yao B.-H.,South China University of Technology | Li W.-C.,Ningbo Tuopu Steering System Co. | And 3 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock

Uniaxial fatigue tests for a rubber specimen were conducted, and mean strain effect on fatigue life under constant strain amplitude was analyzed. Taking a dumbbell natural rubber specimen as a study object, the relationship between the loading displacement and the maximum principal strain of the rubber specimen at a critical position was determined with finite element analysis (FEA). A mean strain function was constructed, and a fatigue life prediction model under different strain mean values and amplitudes was established based on the ε-N curve of the natural rubber with 0 strain ratio. The fatigue life of the dumbbell natural rubber specimen predicted with the model agreed well with the tested one. The fatigue life prediction model for a natural rubber component peoposed here was helpful for establishing fatigue life database of natural rubber materials. Source

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