Abstract
As a new torsional vibration absorber, the dual mass flywheel (DMF) contains a symmetric structure in which the damping element is a pair of springs symmetrically distributed along the circumference direction. Through reasonable matching parameters, the DMF functions in isolating torsional vibrations caused by the engine from the transmission system. Our work aims to solve the accuracy of matching models between the DMF and power transmission system. The critical structural parameters of each order modal are treated consecutively by two methods: Absolute sensitivity (e.g., under the idle condition and driving condition), and relative sensitivity. The operation achieves a separation of the parameters and diagnosis of the relationship between these parameters and the natural frequency in the system. In addition, the natural frequency range is determined based upon the area of the resonance speed. As a result, the matching model is established based on the sensitivity analysis method and the natural frequency range, which means the moment of inertia distribution (its coefficient should be used as one structural parameter in relative sensitivity analysis) and the torsional stiffness in multiple stages can be observed under the combined values. The effectiveness of the matching model is verified by experiments of a real vehicle test under the idling condition and driving condition. It is concluded that the analysis study can be applied to solve the parameters matching accuracy among certain multi-degree-of-freedom dynamic models.
Highlights
IntroductionAs the automobile power output and transmission are linked, dynamic characteristics of power transmissions are an important factor in ride safety, fuel economy, and NVH (noise, vibration, and harshness) performance of vehicles
As the automobile power output and transmission are linked, dynamic characteristics of power transmissions are an important factor in ride safety, fuel economy, and NVH performance of vehicles
This study addressed the matching model of the dual mass flywheel (DMF) and the power transmission by integration of the sensitivity analysis method and the vibration reduction theories
Summary
As the automobile power output and transmission are linked, dynamic characteristics of power transmissions are an important factor in ride safety, fuel economy, and NVH (noise, vibration, and harshness) performance of vehicles. It is recognized that vibrations and noises are the most important indicators to evaluate the vehicle NVH performance [1]. Vehicle vibration noises can be caused by the power source, aerodynamics, tires, transmission system, and uneven loads and so on. Torsional vibration is the main source of the vibration noises of power transmission. There are several ways to suppress torsional vibration of the power transmission. The traditional way uses the elastic element to change the natural frequency to avoid the resonance zone and the damping element to attenuate the vibration amplitude [4]. We used a driven plate type clutch torsional vibration damper
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