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Some Aspects of Rigid Body Dynamics of Power Trains Using Dedicated Software with Respect to Noise and Vibration
Technical Paper
2015-01-2256
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper considers important aspects of rigid body dynamics of power trains with respect to noise and vibration (by definition a power train (PT) term here is an engine plus transmission). Flexibility of PT's and their ancillaries leads to unwanted levels of noise and vibration. By employing rigid body concepts we can assess the levels of unwanted flexibility of whole PT's and their ancillaries e.g. mounting brackets. Using dedicated software based on rigid body theory it is possible to define vibration and noise ‘entitlement’ i.e. minimum vibration and noise that can theoretically be achieved. Targets can then be to set based upon these entitlements. This can then lead to better more robust designs to achieve higher levels of refinement. The use of generic 3 and 4 cylinder one liter in-line PT's modes are used within the software to aid this study. These PT's can be shown to adhere more to rigid body behavior due to their compact designs and lower (frequency) dominant orders of excitation. This paper steps through from basic understanding of rigid PT behavior then shows some rigid vibration and noise results for generic 3 and 4 cylinder PT's at key mount positions it then leads into leads onto how and why rigid vibration theory can help improve refinement with accompanying graphs and schematics to clarify understanding.
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Citation
Troth, C., "Some Aspects of Rigid Body Dynamics of Power Trains Using Dedicated Software with Respect to Noise and Vibration," SAE Technical Paper 2015-01-2256, 2015, https://doi.org/10.4271/2015-01-2256.Also In
References
- Moetakef , M. and Bonhard , B. Statistical Analysis of Rigid Body Modes of Engine Mounting System Due to Mount Rates Variability SAE Technical Paper 2006-01-3466 2006 10.4271/2006-01-3466
- Sui , J. , Hoppe , C. , and Hirshey , J. Powertrain Mounting Design Principles to Achieve Optimum Vibration Isolation with Demonstration Tools SAE Technical Paper 2003-01-1476 2003 10.4271/2003-01-1476
- EVRA - (Engine Vibration Rigid Analysis) Rigid body 3 dimensional Fortran program that computes x/y/z vibration/force/noise for up to 4 Spatial points (engine mount tips) using fundamental mass/inertia/geometry/cylinder gas pressures. The code originally written for mainframes was known as EVA was developed for Austin Rover, Antony Spillane, Colin Troth, and Derek Gardner
- ENRA - (Engine Noise Rigid Analysis) A compliment Fortran program to EVRA it uses EVRA front end and then computes structural noise through engine mounts using noise transfer functions (NTF's) and mount stiffness data. The code originally for mainframes, was known as ETA was developed for Austin Rover Group, Antony Spillane, Colin Troth, and Elizabeth Bright