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An Investigation of Rotational Response of Accessory Drive Serpentine Belt System
Technical Paper
2001-01-1425
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Serpentine belt system has been widely used during past years to drive automotive accessories like power steering, alternator, and A/C compressor from a crankshaft pulley. Instead of using multiple belt drives, the serpentine belt system uses a multi-rib flat belt, which wraps around several idlers and accessory pulleys. This design requires the use of a tensioning device to maintain adequate belt tension for preventing slip. Crankshaft torsional vibrations can lead to excessive rotational vibrations in poorly designed accessory systems. This can lead to undesirable noise and excessive slip, which can hamper the belt and bearing life. The value of these rotational frequencies and system response is of utmost interest to the accessory drive designer. While it is not practical to shift these rotational frequencies out of the operating range of an engine, a belt layout with these frequencies at non-dwell engine speed is highly desirable.
The presence of a tensioner induces non-linearity since the tensioner arm motion changes the adjacent belt span lengths and hence the stiffness. The coulomb friction in the tensioner arm can lead to stick-slip motion of the arm that can induce a higher harmonic response. Thus, standard linear vibration analysis tools cannot be used to predict the response, and one must resort to numerically integrating the equation of motion. A modular integration technique is suggested where an accessory drive system model can be generated by assembling pre-defined blocks which capture the behavior of individual components like tensioner, belt span, and accessory pulley. Implementation of this model into commercially available software is accomplished easily. The system model is excited by a sine sweep signal to determine the response under entire operating range. By predicting the dynamic response of an accessory layout the effect of a design change is determined rapidly, thus reducing the development time.
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Authors
- J. S. Sandhu - Powertrain CAE, Simulation Department, DaimlerChrysler Corp.
- M. K. Wehrly - Powertrain CAE, Simulation Department, DaimlerChrysler Corp.
- W. F. Resh - Powertrain CAE, Simulation Department, DaimlerChrysler Corp.
- B. A. Rose - Powertrain Engineering, Large Car Platform, DaimlerChrysler Corp.
Citation
Sandhu, J., Wehrly, M., Resh, W., and Rose, B., "An Investigation of Rotational Response of Accessory Drive Serpentine Belt System," SAE Technical Paper 2001-01-1425, 2001, https://doi.org/10.4271/2001-01-1425.Also In
References
- Beikmann, R.S. Perkins, N.C. Ulsoy, A.G. 1997 Design and Analysis of Automotive Serpentine Belt Drive Systems for Steady State Performance ASME Journal of Mechanical Design 119 162 168
- Barker, C.R. Oliver, L.R. Breig, W.F. 1991 Dynamic Analysis of Belt Drive Tension Forces During Rapid Engine Acceleration SAE Congress Detroit, MI 910687 239 254
- Hwang, S.-J. Perkins, N.C. Ulsoy, A.G. Meckstroth, R.J. 1994 Rotational Response and Slip Prediction of Serpentine Belt Drive Systems ASME Journal of Vibration and Acoustics 116 71 78
- Leamy, M.J. Perkins, N.C. 1998 Nonlinear Periodic Response of Engine Accessory Drives With Dry Friction Tensioners ASME Journal of Vibration and Acoustics 120 909 916