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      저자 : Fengfeng Hu (검색결과 2 건)
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        Elastic dynamic research of high-speed multi-link precision press considering structural stiffness of rotation joints

        Fengfeng Hu,Yu Sun,Binbin Peng 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.10

        An elastic dynamic model of high-speed multi-link precision press considering structural stiffness of rotation joints was established by the finite element method. In the finite element model, rotation joint was established by four bar elements with equivalent stiffness, and connected link was established by beam element. Then, the elastic dynamics equation of the system was established, and modal superposition method was used to solve the dynamic response. Compared with the traditional elastic dynamic model with perfect constraint of the rotation joints, the elastic dynamic response value of the improved model is larger. To validate the presented new method of elastic dynamics analysis with stiffness of rotation joints, a related test of slider Bottom dead center (BDC) position in different speed was designed. The test shows that the model with stiffness of rotation joints is more reasonable. So it provides a reasonable theory and method for dynamic characteristics research of sucha multi-link machine.

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        Dynamic modeling of a high-speed over-constrained press machine

        Yejian Li,Yu Sun,Binbin Peng,Fengfeng Hu 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.7

        This paper presents a study on the dynamic modeling of a high-speed over-constrained press machine. The main contribution of the paper is the development of an efficient approach to perform the dynamic analysis of a planner over-constrained mechanism. The key idea is the establishment of a more general methodology, which is to gain a deformation compatibility equation for the over-constrained mechanism on the basis of the deformation compatibility analysis at each position of the mechanisms. And this equation is then used together with the force/moment equilibrium equations obtained by the D’Alembert principle to form a total equation for the dynamics of the over-constrained mechanism. The approach is applied to a particular press machine to validate the effectiveness of the approach, and in the meantime to provide some useful information for the improvement of the design of this press machine.

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