Experimental and Calculation Analysis of Rotational Vibration for an Engine Front End Accessory Drive System

To investigate the rotation vibration dynamics of the pulleys and the tension arms, and to estimate the vibrations of the belts and the slip ratio between the belt and the pulleys in the engine front-end accessory drive systems, a systematic modelling and analytical method is proposed for engine front-end accessory drive systems; this can be used for modelling engine front-end accessory drive systems with different layouts and different numbers of tensioners, including automatic and fixed tensioners. In the modelling, the rotational pulleys are classified as fixed-axis pulleys and moveable-axis pulleys (such as the pulley in the tensioner). Moreover, the belt spans are classified as the belt spans between the two fixed pulleys, and the belt spans adjacent to the pulley of a tensioner. The equations of motion for each type of pulley and the tension calculation equations for each type of belt span are developed. In this way, the equations of motion for all the pulleys and the tensioner arms can be obtained easily, irrespective of the layout of the tensioners. To obtain the dynamic rotational vibration responses of an engine front-end accessory drive system by the conventional Runge–Kutta method, high-efficiency algorithms or methods are also proposed for calculating the tangent-point coordinates between a belt and the adjacent pulleys and the belt length of the contact arc on one pulley. The proposed modelling and analysis methods are validated by modelling different layouts of the engine front-end accessory drive systems with different types and numbers of tensioners, and also by comparisons between the calculated dynamic vibration responses of the pulleys and the belts and the real experimental data.

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Stick–slip oscillations of an engine front-end accessory drive system with a mechanical tensioner

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/0954407020950581 ◽

2020 ◽

pp. 095440702095058

Author(s):

H Zhu ◽

WD Zhu ◽

W Fan

Keyword(s):

Dry Friction ◽

Harmonic Balance ◽

Harmonic Balance Method ◽

Friction Torque ◽

Drive System ◽

Balance Method ◽

Stick Slip ◽

Front End ◽

Rotational Vibration ◽

Calculation Results

This article is aimed to investigate the stick–slip oscillations of an engine front-end accessory drive system with a mechanical tensioner. Based on several assumptions, a generic dynamic model of rotational vibrations of an engine front-end accessory drive system with arbitrary number of accessory pulleys and one mechanical tensioner is established. In this model, the tensioner dry-friction torque is approximated by a hyperbolic tangent function with a scaling factor to control the sticking zone. An improved multiple harmonic balance method is used to solve the governing equations of rotations of the engine front-end accessory drive system and obtain the periodic rotational vibrations of the system accessory components. The calculation results obtained from the improved multiple harmonic balance method are verified by the results obtained from the Runge–Kutta integration method. Amplitude–frequency responses of rotational vibrations of the accessory components in the engine front-end accessory drive system are calculated using the arc-length technique based on the improved multiple harmonic balance method. Stick–slip oscillations of the tensioner arm with different values of the tensioner dry-friction torque are calculated and influences of the tensioner dry-friction on system rotational vibration amplitudes are analyzed. Variations of system vibration energies dissipated by the tensioner dry-friction at different crankshaft speeds with increases of the maximum tensioner dry-friction torque are calculated, and an optimum design of the tensioner dry-friction damping is given according to the results.

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Active front end motor-drive system operation under power and phase loss

2018 IEEE Applied Power Electronics Conference and Exposition (APEC) ◽

10.1109/apec.2018.8341066 ◽

2018 ◽

Author(s):

Ahmed Sayed-Ahmed ◽

Brian Seibel ◽

Russel J. Kerkman

Keyword(s):

Drive System ◽

Motor Drive ◽

System Operation ◽

Front End ◽

Phase Loss ◽

Motor Drive System

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Analysis for Dynamic Performances of Engine Front End Accessory Drive System under Accelerating Condition

10.4271/2020-01-0399 ◽

2020 ◽

Author(s):

Chujian Lin ◽

Shangbin Long ◽

Yi Sun ◽

Weijun Zhao ◽

Wen-Bin Shangguan

Keyword(s):

Drive System ◽

Front End ◽

Dynamic Performances

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Fatigue Life Analysis of an Automotive Tensioner Through Strain-Life Approach

Volume 10: ASME 2015 Power Transmission and Gearing Conference; 23rd Reliability, Stress Analysis, and Failure Prevention Conference ◽

10.1115/detc2015-47915 ◽

2015 ◽

Author(s):

Maryam Talimi ◽

Jean W. Zu

Keyword(s):

Fatigue Life ◽

Stress Analysis ◽

Drive System ◽

Life Assessment ◽

Fatigue Properties ◽

Fatigue Life Assessment ◽

Front End ◽

Life Analysis ◽

Fatigue Life Analysis ◽

Prediction Approach

In this paper, fatigue life assessment of a tensioner is studied through dynamic load analysis, stress analysis, and stress-life fatigue analysis approach. Tensioner is a critical part of an automotive front end accessory drive system, providing pre-tension to the belt. The front end accessory drive systems are responsible for transmitting power from the crankshaft to the accessory components. Due to the engine pulsation, components of the accessory drive including the tensioner are subjected to dynamic loads leading to fatigue failure. The fatigue life assessment of a mechanical component highly depends on loading, geometry, and material properties. In addition, the dynamic behavior of the front end accessory drive is complicated due to coupling between several modes of vibrations in belt, pulleys, and the tensioner arm. Duo to the complexity of the parameters involved and complicated dynamics, the fatigue life analysis of FEAD components is a challenging task. This paper includes three main parts, namely stress analysis, fatigue properties prediction, and life estimation. The dynamic analysis of a generic front end accessory drive system is performed in order to obtain effective loads on the tensioner. Stress state for the tensioner in case of different applied loading conditions is performed via a series of Finite Element (FE) analyses, and the critical region of the part is determined. Finally, fatigue life is estimated through strain-life approach. Modest work has been found in this area providing a comprehensive solution to the fatigue life investigation of power train components. The present study offers a comprehensive modeling approach which predicts the automative tensioner lifetime. The lifetime of any FEAD system components can be determined using the developed fatigue life prediction approach.

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