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Song L.,Chongqing University | Zhou J.,Chongqing University | Wu R.,Chongqing University | Yin Y.,Chongqing University | And 3 more authors.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2012

The design theory of friction double-stage piecewise variable stiffness dual mass flywheel is proposed. Using the given design method, the flexibility with low spring rate of dual mass flywheel at low speed, low torque and low wind-up angle can be realized, and high spring rate and high counter torque at high wind-up angle can also be achieved. The structure and working principle of the proposed friction double-stage piecewise variable stiffness dual mass flywheel is analyzed. The structure for two-stage overload protection is designed, then the mathematical-mechanical model of torque characteristics of friction double-stage piecewise variable stiffness dual mass flywheel is derived, and the test show that the test results of torque characteristics is consistent with the simulation analysis of the constructed model. The affection of spring rate on transmission system's first and second order resonance speed is researched. The idea that using friction to increase torque and to realize overload protection is introduced into the design of dual mass flywheel, so the design method for high quality dual mass flywheel can be got, the intrinsic nature for vibration damper of double-stage piecewise variable stiffness dual mass flywheel is also revealed. © 2012 Journal of Mechanical Engineering.


Song L.,Chongqing University | Yin Y.,Chongqing University | Zhou J.,Chongqing University | Zeng L.,Chongqing University | And 2 more authors.
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2013

A torque characteristics mathematics-mechanical model of dual mass flywheel is established. The torque characteristics curve which is consistent with the test results is obtained by dynamics simulation analysis of the dual mass flywheel by using ADAMS. It is concluded that the work process of the dual mass flywheel can be more authentic and the torque can be increased greatly by taking the friction characteristics into account in the simulation model. Moreover, by the wedging friction of the spring seats' heads, the torque non-linearly increases on the condition of large torsion angle. Thus the requirements that low torque and small torsion angle should be flexible, high torque and large torsion angle should be of high counter torque are satisfied. Then the design goal that the driven system's first-order and second-order resonant speeds are beyond the normal speed of the engine can be achieved.


Song L.,Chongqing University | Li L.,Chongqing University | Zhou J.,Chongqing University | Luo S.,Chongqing Guangda Industry Co. | Tian H.,Chongqing Guangda Industry Co.
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2013

Dual-clutch transmission and double-turbine torque converter's flexible flywheel is the newly developed type which has applied the design of a two-body flexplate. Corresponding 3D modeling of this new type of flywheel has been constructed by virtue of the software Pro/Engineer. Further comparative analysis has been studied in terms of structural stress, modal, and harmonic by the finite element software ANSYS Workbench, Through all these studies, the simulation results show that two-body flexible is a kind of the structure has a better performance. On this basis, the shape of the flexplate in the flywheel has been optimized with different flexibility to meet the requirement of dynamic characteristics, the test verifies the correctness of analytical approach and the rationality of product structure. A feasible design and practical analytical approach has been brought up through this study.


Song L.,Chongqing University | Niu H.,Chongqing University | Zeng L.,Chongqing University | Tian H.,Chongqing Guangda Industry Co.
Qiche Gongcheng/Automotive Engineering | Year: 2015

For exploring the influence of kinetic parameters on the dynamic responses of vehicle powertrain system, and realizing the reasonable matching of dual mass flywheel so as to achieve the goal of torsional vibration attenuation, a torsional vibration model for vehicle driveline is established, consisting of subunits including engine, dual mass flywheel, transmission and differential etc. Through sensitivity analysis, the effects of kinetic parameters of subunits on the inherent characteristics of system are revealed, and both simulation and test verification on the forced vibration of system are conducted. The results show that the input excitation torque model proposed with consideration of friction and inertia force is realistic with concise expression, and the modeling approach based on unit analysis reveals the internal connection between parameters and inherent characteristics of system, providing a theoretical basis for the optimization of system kinetic parameters, and a guidance for the reasonable matching and design of dual mass flywheel. ©, 2015, SAE-China. All right reserved.


Song L.,Chongqing University | Zhi Z.,Chongqing University | Zeng L.,Chongqing University | Tian H.,Chongqing Guangda Industry Co.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2015

Combining with the design and development of circumferential short spring automobile dual mass flywheel, the safety protection device based on auto-lock theory is proposed. This device can automatically connect the primary and secondary flywheel together by wedging the profiles of them with the auto-lock feature to avoid driving accident when flywheel fails, and this device is reliable and with simple mechanism. By establishing the force analysis model considering friction, the equation of ensuring auto-lock shape constraint profile is obtained. Based on the above and with the application of Winkler elastic theory, the analysis calculation model of contact force and torque-torsion angle based on shape constraint is established. With the application of the theoretical method, the safety protection device of the dual mass flywheel assembled on the 2.0 L engine is designed. Results of finite element analysis and real test verify the theoretical method and the calculation model proposed comply with the reality. By thorough analysis and research, design criteria of safety protection device of dual mass flywheel is summarized and the proposed design theory and method can be applied to design practice, which broadens the design theory of dual mass flywheel. ©, 2015, Journal of Mechanical Engineering.


Song L.,Chongqing University | Li L.,Chongqing University | Yin Y.,Chongqing University | Luo S.,Chongqing Guangda Industry Co. | And 2 more authors.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2012

It is required that dual mass flywheel of small torsion and low torque should be flexible, while high torque and large torsion should be of high counter torque. According to this requirement, and combining with the engineering design of product R&D, research and practice are devoted into realizing the design object that the dual mass flywheel with circumferential short spring can reach the standard of continuous variable stiffness, which creatively propose the solution that shape constraint can be accomplished in the way of altering the internal contact profile of primary flywheel. Besides, selection principle of curve has been suggested by analyzing and comparing the structure of shape constraint. Based on the study of the torque characteristics of dual mass flywheel on shape constraint, the analytical mode has been built by comparing the simulation calculation results and the experimental measurements. Through analyzing the impact of torsional stiffness k 1 and k 2 on the driven system's first and second-order's resonance speed, it is concluded that k 2 is not sensitive to the first-order's resonance speed, instead, the second-order's resonance can be affected evidently. On the condition of small torsion angle, the reduction of k 1 can keep the first-order's resonance far away from idling speed, which can keep the resonance being averted completely. Moreover, case study has been made in the mechanical characteristics lying in torsional stiffness and the resonance speed of the dual mass flywheel based on shape constraint, showing that the non-linear torque characteristics of the continuous variable stiffness is of great advantage that a simpler structure can fulfill the expectation of required torque, stiffness and vibration isolation. ©2012 Journal of Mechanical Engineering.

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