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A Theory on the Relationship Between Drive Train Vibration and Belt-Driven Engine Cooling Fan Fatigue Failures
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Abstract
Fatigue failures observed in a belt-driven engine cooling fan indicated the presence of significant vibration activity. A testing and analysis program was undertaken in an effort to measure the fan vibration characteristics in a vehicle environment, and relate these characteristics to some known source of excitation. The classical vibration analysis of a fan and fan pulley coupled to a crankshaft pulley by a drive belt commonly predicts the fan to be effectively isolated from crankshaft vibration. The results of this testing program, however, indicated the presence of significant torsional and linear vibration at frequencies that corresponded to crankshaft torsional vibration orders, and thus indicated a complex mechanism of energy transfer through the belt system.
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Citation
Bremer, R., "A Theory on the Relationship Between Drive Train Vibration and Belt-Driven Engine Cooling Fan Fatigue Failures," SAE Technical Paper 760842, 1976, https://doi.org/10.4271/760842.Also In
References
- Hartog Den “Mechanical Vibration” 165
- “CEC Type 9-102 Torsiograph Operation and Maintenance Manual”
- “General Motors Research Velocity Torsiograph Instruction Manual” October 1967
- “CEC Type 1-117-0011 Vibration Meter Operation and Maintenance Manual”
- “CEC Type 1-159-0001 Variable Filter Operation and Maintenance Manual”