Design Method Of Centrifugal Pendulum Dual Mass Flywheel And Analysis Of Torsional Vibration Isolation

Torsional vibration of power transmission system is an important aspect of NVH performance.It affects the comfort of the vehicle and the service life and reliability of the parts.Therefore,it is necessary to reduce and control torsional vibration.Dual mass flywheel as a new type of torsion damper can effectively reduce the low order natural frequency of transmission system and make it low to the engine idle.And engine vibration can be effectively isolated to avoid resonance.With the rapid development of dual mass flywheel technology,a large number of new structures have emerged.And the centrifugal pendulum dual mass flywheel represents the current development level of dual mass flywheel technology.The shock absorber has better performance and the vibration caused by ignition excitation of engine can be attenuated.In this paper,the working principle and vibration isolation performance of centrifugal pendulum dual mass flywheel are analyzed theoretically and the performance of the system is simulated by AMESim software.The main content of this article is as follows.(1)In this paper,the drive train torsional vibration problems and the research significance of centrifugal pendulum dual mass flywheel are briefly introduced.Combine with the dual mass flywheel research status at home and abroad to introduce the working principle of dual mass flywheel and several typical structures.(2)The main excitation source that caused torsional vibration of power transmission system is the vibration of engine.Therefore,it is necessary to study the engine excitation.In this paper,the motivation of single cylinder engine are analyzed,and then the four-cylinder engine excitation are analyzed.By using the simplified principle of power transmission system to establish the equivalent model of transmission system,and then its vibration differential equation is derived,finally the intrinsic characteristic of the system and the natural frequency are analyzed.(3)The moment of inertia of dual mass flywheel,the selection of damping system and the calculation of torsional rigidity are studied and the structure of centrifugal pendulum are briefly introduced.Motion analysis is carried out by the structure of centrifugal pendulum which model to simplify the mathematical movement model.By using Newton's law to derive the vibration differential equation,and then the natural frequency is analyzed.Find that the natural frequency is proportional to the steady speed of the flywheel.According to this characteristic,Use the resonance theory and the theory of forced vibration to analyze vibration isolation performance.Get the conclusion that through reasonable design of the structure parameters can be very effectively to eliminate the vibration of the engine ignition order(4)The vehicle power transmission system model with centrifugal pendulum dual mass flywheel is established by AMESim software and the vibration isolation effect of the shock absorber with the model is analyzed.It is also compared with ordinary dual mass flywheel to analyze the performance of vibration isolation.The conclusion shows that the centrifugal pendulum dual mass flywheel can effectively reduce the vibration of the engine under low order incentive and especially attenuate vibration of engine ignition order incentive.(5)The test method of centrifugal pendulum dual mass flywheel and the test scheme of bench test and vehicle performance test are studied.The bench test is used to verify the correctness of the torsion spring design method.The vehicle performance test is used to verify the vibration isolation effect of the shock absorber.They can provide some reference for the experimental research and development of centrifugal pendulum dual mass flywheel.