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NVH Improvement of a Bus Through AC Compressor Drive-Ratio Change
Technical Paper
2009-26-0045
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SIAT 2009
Language:
English
Abstract
This paper is an outcome of development work done in improving Noise Vibration Harshness (NVH) performance of a bus. A concern from built-up prototypes was high floor vibration levels at higher speeds when Air-Conditioner (AC) was switched on. Running mode analysis of bus-vibrations was performed to visualize exact behavior of its frame. It was revealed that a 4th order vibrations of the AC compressor was matching with a structural resonance of the bus frame on which the AC compressor was mounted. The frame suffered from high amplitudes of torsional vibrations especially near a power-train mount. And these excitations were transferred to the bus-floor. With a change in drive-ratio of the AC compressor, decoupling of its vibrations from the Bus-frame mode was made. This led to a significant reduction of the floor vibrations and increased comfort to the passengers at higher speeds.
Authors
Topic
Citation
Naga Suresh, I., Sudhakara Naidu, T., Ambardekar, M., and Arora, G., "NVH Improvement of a Bus Through AC Compressor Drive-Ratio Change," SAE Technical Paper 2009-26-0045, 2009, https://doi.org/10.4271/2009-26-0045.Also In
References
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- Kim, Jong-Hyun et al. “Influence of Chassis Flexibility on Dynamic Behavior of Engine Mount Systems” SAE paper No. 942269 1994
- Suzuki, S. et al. “Dynamic Analysis of Forklift Truck using Building Block Approach” JSAE Review 46 53 March 1983