Design Optimisation of Engine Mounts for Improved Vibration Isolation in Three Wheeled Passenger Vehicles Paper No. 2024-DF-01 Section Research Papers

##plugins.themes.academic_pro.article.main##

Jagadeesh Selvaraj
Mahadevan Pichandi
Hemanth Gupta E.
Anandh U.

Abstract

Powertrain mounting systems play a crucial role in the overall functioning of three-wheeled passenger vehicles equipped with a single-cylinder diesel engine. Primarily, engine mounting systems are tasked with isolating the vehicle and its occupants from the vibrations produced by the engine. A properly designed engine vibration isolation system should ensure the stable positioning of the powertrain within the vehicle, even when subjected to dynamic forces and torque loads. Furthermore, it should accommodate the general motion of the powertrain and prevent any contact between the engine, transmission, and associated components of the vehicle.


The mounting system should additionally shield the engine from loads imposed by chassis torsion or twists while minimizing the shock loads transmitted to the engine caused by road undulations. Moreover, the mounting system needs to prevent the powertrain system frequency from coinciding with suspension wheel hop and tramp frequency, as well as structure-borne and human-organ resonances.


Therefore, a comprehensive examination of the powertrain mount design is crucial to ensure improved vibration isolation.


This paper delves into the design considerations of a powertrain mounting system for a three-wheeled passenger vehicle featuring a transversely mounted single-cylinder diesel engine at the rear. The powertrain relies on three elastomeric mounts, with two positioned at the front of the engine and one at the rear.


In this paper, a design rationale and calculation methodology for determining the stiffness and location of a powertrain mounting system are presented. This approach allows for changes in mount positions within allowable practical limits, considering packaging constraints. The analysis involves studying the vibration patterns of the existing powertrain configuration by examining its rigid body mode shapes. The paper proposes an approach to modifying the stiffness and positions of the elastomeric mounts with the goal of achieving >80% modal purity. This methodology focuses on mitigating vehicle vibrations and noise associated with these mounts, with the primary aim of enhancing the performance of the mounting system, ultimately leading to improved vibration isolation performance of the powertrain mounts.


Keywords: Engine Mounts, Vibration, Three Wheeled, Powertrain, diesel engine, elastomeric mounts, MATLAB, Voigt Model, DOF model, kinetic energy

##plugins.themes.academic_pro.article.details##

How to Cite
Jagadeesh Selvaraj, Mahadevan Pichandi, Hemanth Gupta E., & Anandh U. (2024). Design Optimisation of Engine Mounts for Improved Vibration Isolation in Three Wheeled Passenger Vehicles: Paper No. 2024-DF-01. ARAI Journal of Mobility Technology, 4(2), 1073–1087. https://doi.org/10.37285/ajmt.4.2.1

References

  1. Yunhe Yu, Nagi G Naganathan and Rao V. Dukkipati, "A literature review of automotive vehicle engine mounting systems," Mechanism and Machine Theory 36 , pp. 123-142, 2001. https://doi.org/10.1016/s0094-114x(00)00023-9
  2. M. Iwahara and T. Sakai, “The Optimum Layout of Engine Mounting by Dynamic Analysis,” SAE Technical Papers, 1999.
  3. Brach, R. Matthew. “Automotive Powerplant Isolation Strategies,” SAE Transactions 106 (1997): 2790–95.
  4. Shital, P., Ghosh, C., Talwar, H., Gosain, A. et al., "A Study of Engine Mount Optimisation of Three-Cylinder Engine through Multi-Body Dynamic Simulation and Its Verification by Vehicle Measurement," SAE Technical Paper 2015-26-0126, 2015 https://doi.org/10.4271/2015-26-0126
  5. Yu, Y., Peelamedu, S. M., Naganathan, N. G., and Dukkipati, R. V. (June 9, 1999). "Automotive Vehicle Engine Mounting Systems: A Survey," ASME. J. Dyn. Sys., Meas., Control. June 2001; 123(2): 186–194. https://doi.org/10.1115/1.1369361
  6. Sui, S. J. "Powertrain Mounting design Principles to Achieve Optimum Vibration isolation with dimension Tools," Society of Automotive Engineers (2003).
  7. Bretl, John. “Optimization of engine mounting systems to minimize vehicle vibration,” No. 931322. SAE Technical Paper, 1993. https://doi.org/10.4271/931322
  8. Sakai, T., Takano, Y., and Iwahara, M., "The Optimum Design of Engine Mounting," SAE Technical Paper 982825, 1998 https://doi.org/10.4271/982825
  9. Snyman, J. A., P. S. Heyns, and P. J. Vermeulen. "Vibration isolation of a mounted engine through optimization," Mechanism and Machine Theory 30, no. 1 (1995): 109-118. https://doi.org/10.1016/0094-114x(94)00023-e
  10. Singh, R. "Dynamic design of automotive systems: Engine mounts and structural joints," Sadhana 25 (2000): 319-330. https://doi.org/10.1007/bf02703548
  11. Liu, C. Q. "A computerized optimization method of engine mounting system," SAE transactions (2003): 1650-1655.
  12. Lee, D-H., W-S. Hwang, and C-M. Kim. "Design sensitivity analysis and optimization of an engine mount system using an FRF-based substructuring method." Journal of Sound and Vibration 255, no. 2 (2002): 383-397. https://doi.org/10.1006/jsvi.2001.4160
  13. Garmaroudi, M. Asadi, and J. Mosayebi. "Design and Optimization of Engine Mount," International Review of Mechanical Engineering 2, no. 5 (2008): 682-692. https://doi.org/10.15866/irecon.v5i4.13754
  14. Ford, David M. “An Analysis and Application of a Decoupled Engine Mount System for Idle Isolation,” No. 850976. SAE Technical Paper, 1985. https://doi.org/10.4271/850976
  15. Derby, Thomas F. "Decoupling the three translational modes from the three rotational modes of a rigid body supported by four corner-located isolators," Shock and Vibration Bull 43 (1973): 91-108.
  16. Crede, Charles Edwin. "Vibration and shock isolation." (1951).
  17. Akanda, Anab, and Chandu Adulla. “Engine mount tuning for optimal idle and road shake response of rear-wheel-drive vehicles,” No. 2005-01-2528. SAE Technical Paper, 2005. https://doi.org/10.4271/2005-01-2528
  18. Biswas, S. "An Approach to Minimization of Drive Train Noise Through Redesign of Engine Mounts," International Journal of Vehicle Structures & Systems 9, no. 4 (2017): 251-260. https://doi.org/10.4273/ijvss.9.4.11
  19. Nishioka, Keiichi, Hiroshi Takada, and Takashi Kitahara. “Noise and Vibration Reduction Measures Applied to Diesel Engine Cars,” No. 830925. SAE Technical Paper, 1983.
  20. Zhang, Jie, and Christopher M. Richards. "Dynamic analysis and parameter identification of a single mass elastomeric isolation system using a Maxwell-Voigt model," (2006): 713-721. https://doi.org/10.1115/1.2345676
  21. Spiekermann, C. E., Radcliffe, C. J., & Goodman, E. D. (1985, June 1). Optimal Design and Simulation of Vibrational Isolation Systems. Journal of Mechanisms, Transmissions, and Automation in Design, 107(2), 271–276. https://doi.org/10.1115/1.3258720
  22. Thomson, W. (1996, February 1). Theory of Vibration with Applications. CRC Press. http://books.google.ie/books?id=0fl1pKtaghAC&printsec=frontcover&dq=Theory+of+vibration+with+applications&hl=&cd=1&source=gbs_api
  23. Horovitz, M. "Suspension of internal-combustion engines in vehicles," Proceedings of the Institution of Mechanical Engineers: Automobile Division 11, no. 1 (1957): 17-51.