Wu J.,South China University of Technology |
Wu J.,Guangdong Key Laboratory for Automotive Engineering |
Shangguan W.,South China University of Technology |
Shangguan W.,Guangdong Key Laboratory for Automotive Engineering |
Pan X.,Ningbo Tuopu Vibro Acoustics Technology Inc.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2010
The dynamic properties of rubber materials are related to excitation amplitude and excitation frequency. Based on the overlay method of constitutive models, the hyperelastic-viscoelastic-plastoelastic constitutive model is built for characterizing the dynamic properties of rubber materials. The hyperelastic model is used to describe the elastic property of rubber materials, and the viscoelastic and plastoelastic models are used to characterize the frequency and amplitude dependency, respectively. Parameter identification method and the computational aspects of the frequency- and amplitude-dependent dynamic properties of the rubber isolators are investigated. The model parameters are identified by using the simple shear experimental data of rubber specimens. Based on the identified model parameters, the dynamic properties of a powertrain rubber mount are calculated by using the finite element analysis method and the calculated results agree well with the experimental data. It is shown that the presented model can predict the frequency- and amplitude-dependent dynamic properties of the rubber materials with little relative errors. Therefore, the presented method can be used for prediction and optimization design of the dynamic properties of rubber isolators. © 2010 Journal of Mechanical Engineering.
Zhang P.,SAIC |
Chai G.,Zhejiang University of Technology |
Pan X.,Zhejiang University of Technology |
Pan X.,Ningbo Tuopu Vibro Acoustics Technology Inc |
Shangguan W.,South China University of Technology
Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis | Year: 2010
Uniaxial extension, biaxial extension and planar extension tests were conducted to obtain the stress-strain curves of rubber specimens in three states. The parameters of various hyperelastic models for rubbler were obtained by the least square method. The static stiffness in three directions of an automotive powertrain rubber isolator was calculated utilizing the obtained model parameters and compared with the measured. The static stiffness in three directions of the rubber isolator was calculated by using the constitutive model parameters, which were fitted by stress-strain curve in different strain levels. Influences of the Mullin effect and the bulk deformation on static stiffness prediction were investigated.
Shangguan W.-B.,South China University of Technology |
Shangguan W.-B.,Ningbo Tuopu Vibro Acoustics Technology Inc. |
He L.-Y.,South China University of Technology |
Tian Z.-L.,South China University of Technology |
And 2 more authors.
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | Year: 2010
An equipment and the measurement method based on Trifilar Torsional Pendulum (TTP) for obtaining these parameters are presented in this paper. The key improvements to the conventional TTP are: (1) a body with irregular shape is suspended under the TTP, so the c. g. of the body is in line with the torsional axial of the TTP naturely; (2) the methods are based on matrix transformation. The data in the matrix are calculated with the coordinates that are measured with tri-coordinate measurement system. The measured coordinates are with high precisions, so the calculation methods are also with high precisions; (3) the data obtained in each measurement that the body are suspended for different directions can be used both for calculating the c. g. and the inertia properties of an irregular body, such as a powertrain. The method for identification the length and the empty mass of the TTP are described in detail. The c. g. and inertia properties for a regular body that merged with two different regular rectangular bodies are measured. The results are compared with the theoretical solution obtained from the CAD model. The comparisons show that the test rig based on the proposed method and the data processing technologies in the paper is effective. Finally, the c. g. and the inertia properties for an automotive powertrain from the two approaches are given. One approach is to measurement the parameters from the powertrain. And the second is to calculate the parameters based on the c. g. and the inertia properties for the engine and the transmission, which are identificated from the measurement on the engine and the transmission, respectively. The parameters from the two approaches agree reasonably well. It is demonstrated that the test rig has good characteristics for repeat measurement and with high precision. The test methods and experimental data processing technologies proposed in this paper can be also used for getting the c. g. and the inertia properties for other irregular bodies.