A Study Of Calculation And Optimization For Performance Of Press Fitted Type Rubber Damped Torsional Vibration Absorber

Owing to the simple structure and low manufacturing cost, press fitted type rubber damped torsional vibration absorber(PFRDTVA) is widely installed in front of the engine crankshaft, playing the role of reducing the torsional vibration. In this paper, each performance of PFRDTVA is researched based on the deficiencies emerged during the manufacturing process, including the resonance frequency performance and assembly performance.The measures of reducing the shaft torsional vibration were analyzed, and the principle of reducing vibration and design steps of PFRDTVA were illustrated emphatically. Torsional vibration model of crankshaft with PFRDTVA was established based on the AVL EXCITEdesigner. The result validate the PFRDTVA matching method with EXCITE-designer software by comparing the EXCITE-designer calculated values and the PAK measured values with an inline three-cylinder engine.The rotational inertia of inertia ring, material hardness and compression ratio of rubber ring are closely related to resonance frequency performance of PFRDTVA. The hyper-elastic properties in quasi-static status of the rubber were gained from the column uniaxial compression test and specimen plane tensile test. The Mooney-Rivlin constructive models for characterizing the hyper-elastic properties were described after fitting the data consolidation. The dedicated fixture of rubber shear specimen were designed and the static and dynamic performance of the rubber shear specimen with different hardness and compression ratios were gained from the tests. The Prony series constructive models for characterizing viscoelastic properties were described after fitting the data consolidation, the resonant frequency of one PFRDTVA was calculated based on the hyperelastic-viscoelastic constitutive model, and the results validate the model by comparing with the real test.Axial run-out of gear, push out force and slip torque are three assessment criteria of the assembly performance of PFRDTVA. The push-out force and slip torque with a PFRDTVA were calculated with ABAQUS, and the results validates the model by comparing with the real rest results. The value of axial run-out of gear, push out force and slip torque mainly depend on the contour design of inertia ring and hub(drum-shaped design). Scale of straight line, minimum interspaces and rubber ring compression ratio are three factors which mostly affect the design of the drum-shaped. Extremum difference analysis was used to evaluate the importance among each factors on the assembly performances. Two schemes for drum-shaped design were proposed: triangle drum and spline drum, the spline drum is superior to the triangle drum according to the assembly performance. The optimization method for obtaining the factors of drum-shaped to maximum the assembly function of a PFRDTVA was proposed based on the BP neural network along with genetic algorithms. The optimized results validates the proposed optimized methods by comparing with real tests.