Research On Dynamic Torsion Angle Testing Method Of Dual-mass Flywheel

Dual mass flywheel(DMF) has been used as a kind of torsional vibration damperin cars for a long history. But the domestic theory for this components especially inthe field of dynamic characteristics are not very useful for guiding the design work ofDMF. As to the dynamic characteristics of DMF, both domestic study and studyabroad, often research in the field like theoretical model and experimental study. Asdifferent theoretical models based on different assumptions and simplified method,experimental study provide very obvious ways to verify the theoretical models.Experimental study of DMF mainly include static characteristic test, fatigue test,engine vibration test, the dynamic characteristic test, etc., which are used to study thestatic characteristics, fatigue characteristics, vibration torsional vibration attenuationcharacteristics, dynamic characteristics of DMF, etc.For DMF dynamic characteristic test, the main test contents are DMF torsionAngle fluctuation and torque fluctuation under dynamic conditions, this paperresearch for the DMF torsional angle test methods.First, this paper analyzes the torsional Angle and the torsional vibration testmethods in the domestic and overseas, aiming at non-stationary signals underdynamic conditions, summarizes the signal processing methods, introduced a seriesof DMF test bench.Then, this paper summarizes the DMF static torsion deformation theory, figureout the new static characteristics on consider of the changing spring coil curvatureand spiral angle. At the same time, analysis the static torsion deformation by usingfinite element method, and compare the results. Set up the static characteristics testbench, complete the torsion deformation test.Thirdly, introduce a series of key technologies in DMF dynamic test, mainlyinclude synchronous process of the signals, the relative torsion angle signalacquisition method, the torsional vibration signal acquisition, signal preprocessingmethod, time domain and frequency domain analysis method of signals, separationand reconstruction, etc.Finally, introduced to DMF dynamic force model, and set up the dynamiccharacteristics test bench, complete the experiment of dynamic torsional characteristics without vibration exciting, vibration attenuation of torsional vibration,characteristics under the accelerate condition.