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Torsional vibration analysis of automotive drivelines\ud

By El-Adl Mohammed Aly Rabeih


One of the most important source of noise and vibrations associated with vehicles is the vibration of driveline systems. Such phenomena are subjectively associated with\ud customer complaints. In this study the torsional vibrations of driveline systems were investigated using discretised and lumped mass models of the system.\ud \ud In the literature, many of the problems associated with torsional vibrations and refinement in drivelines have been tackled through relatively simple, lumped mass models combinedw ith experimentalm easurements. However, some problems remain particularly where instabilities occur or complex coupling with other vehicle vibration modes exists. The review of previous work showed that although it is important to understand the dynamic behaviour of the individual driveline components; for example, engine, clutch, gearbox, etc., the whole system must be analysed together because of all the coupling which occurs.\ud \ud The main source of excitation for torsional vibration of the driveline system is the engine fluctuating torque. A computer program using MATLAB subroutines was developed to obtain this fluctuation torque for different engine parameters for subsequent use in the modelling.\ud \ud A substructure approach, using stiffness coupling technique with combined use of residual flexibility and modal synthesis, was used to analyse free and forced vibrations\ud of the system, as a linear system. A computer program using MATLAB subroutines was designed to facilitate application of this technique. Good agreement between results for the overall system model and substructure model was found even for a few considered modes. This substructure technique offers significant computational advantages over other methods.\ud \ud The effect of non-linear sources in the driveline system such as backlash, non-linear spring stifffiess, Hooke's joint and angularity of the propeller shaft on the system\ud torsional vibrations was investigated. The effect of backlash in the driveline system was significant and, as expected, vibration levels increased as backlash increased.\ud \ud Hooke's joints caused an additional complex source of excitation but their significance is dictated by the details of the particular driveline design.\ud \ud The modelling showed that instabilities commonly referred to a shunt or shuffle could occur during clutch engagement. The stick slip frictional properties of the clutch were\ud crucial in this behaviour and the relative importance of various design features was quantified.\ud \ud A mathematical model including torsional motion of the driveline system and other vehicle body motions was developed to analyse the ways in which the driveline\ud couples with other dynamic components. Two running conditions were considered; steady state running and transient during clutch engagement. It was shown that the\ud complete system was capable of self-excited oscillations under certain conditions during normal running as well as the instability which could occur during clutch engagement.\ud \ud This comprehensive model represents an important contribution of the work in this area of research in two ways. First, it clarifies understanding of the dynamic coupling between the rotational and translational components of the whole vehicle system. Second, it provides design information to tackle instability problems and to lead to reductions in overall vibration levels.\u

Publisher: School of Mechanical Engineering (Leeds)
Year: 1997
OAI identifier: oai:etheses.whiterose.ac.uk:893

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  1. A CAD System for the Analysis of Vehicle Driveline Noise". IMechE, C 121/79,
  2. (1958). A Handbook on Torsional Vibration",
  3. A Modal of Clutch Engagement", IMechE, C147/79,
  4. A Non-Linear Mathematical Model for Dynamic Analysis of Spur Gears Including Shaft and Bearing Dynarnics", doi
  5. (1983). A Study of the Torsional Vibration of Automotive Power Trains",
  6. (1971). A Survey of Modal synthesis Methods", doi
  7. A system Approach to Reducing Gear rattle", doi
  8. An Experimental Study of Vehicle Driveline Vibrations", IMechE, Paper No.
  9. (1992). Analysis of the Friction Surface on Clutch Judder",
  10. Analysis of Vibration by Substructure Synthesis Method (Part 3, Application to Diesel Generator Package)", doi
  11. Analysis of Vibration by Substructure Synthesis Method (Part 4, doi
  12. Application of Modal Modelling and Mount System Optimization to Light Duty Truck Ride Analysis", doi
  13. Automobile Drive-Line Vibration and Internal Noise", Annual Conf. of the stress Analysis Group of the Inst. of physics, "Stress, Vibration and Noise Analysis in Vehicles",
  14. Automotive Driveline Vibration Analysis", NMII, FISIA Congress,
  15. (1990). Clutch Chatter",
  16. Clutch Engagement Simulation: Engagement Without Throttle", doi
  17. Clutch Judder",
  18. (1978). Clutch Manipulation During Engagement", Automotive Engineering,
  19. (1982). Computer Method for Forced Torsional Vibration of Propulsive Shafting System of Marine Engine With and Without Damping",
  20. Computer Modelling of a vehicle Powertrain for Driveability Development", IMechE,
  21. Computer Simulation of Driveline Vibration Due to Universal Joints in Heavy and Medium Duty Truck", doi
  22. (1978). Constant-Velocity Joints", Technical File No 50, Engineering, pp I-VIIII,
  23. (1980). Coupled Torsional-Flexural Vibration of a Shaft in a Geared System of Rotors (I st Report)", doi
  24. (1992). Driveline Vibration Simulation in a Four-Wheel Drive Vehicle. Total Vehicle Dynamics", IMechE,
  25. Dynamic Analysis of High Speed Gears by Using Loaded Static Transmission Error". doi
  26. Dynamic Analysis of Large Structures by Modal Synthesis Techniques", doi
  27. Dynamic Characteristics of Truck Driveline Systems", doi
  28. Dynamic Modelling of the Transmission Line of an Agricultural Tractor", doi
  29. Dynamic Simulation of Road Vehicle Performance Under Transient Acceleration Conditions",
  30. (1988). Dynarnic Stiffhess Matrix Method for the Three-Dimensional Analysis of Crankshaft Vibrations",
  31. Effect of Transtnission Design on Gear Rattle and Shiftability".
  32. Efficiency of Constant Velocity Universal Joints", SAE International, "Automotive Transmissions and Drivelines",
  33. Engagement of Automobile Clutches: Experiments and Theory", Leeds-Lion Conference, Leeds, doi
  34. Engine Torque and Balance Characteristics", doi
  35. (1989). Estimate of Indicated Torque from Crankshaft Speed Fluctuations: a Model for the Dynamics of the IC Engine", doi
  36. (1983). Experiments on the coupling and Transmission Behaviour of Crankshaft Torsional, Bending and longitudinal vibrations in f1igh Speed Engines",
  37. Fundamental Knowledge of Gear Noise -A Survey",
  38. (1992). Fundamentals of Vehicle Dynamics", doi
  39. (1987). Gear Noise Simulation Using a Displacement Based Finite Element Method".
  40. (1990). Lateral Excitation of a Rotating Shaft Driven by a Universal Joint With Friction". doi
  41. Lateral-Torsional Coupled Vibrations of a Rotating Shaft Driven by a Universal Joint. (Derivation of Equations of Motion and Asymptotic Analysis)", doi
  42. Noise and Vibration Control Measures in the Powertrain of Passenger Cars", doi
  43. (1991). Noise and Vibration in the Driveline of Passenger Cars", IMechE Automotive Congress, Seminar 37, Paper No.
  44. (1980). Noise and Vibration of Drive Train",
  45. On the Combined Use of Residual Flexibility and Modal Synthesis Techniques for Large Structures",
  46. On the Necessary and Sufficient Conditions for Homokinetic Transn-Ă½ission in Chains of Cardan Joints", doi
  47. Practical Solution of Torsional Vibration Problems", Chapman &
  48. (1992). Prediction of Torsional Vibration Caused by Hook's Joint in Drive Train Total Vehicle Dynan&s",
  49. Research on the Coupling Power Train Torsional Vibration With Body Fore-Aft and Vertical Vibration of a 4x2 Vehicle", IMechE,,
  50. Self-Excited Vibrations of Truck Tandem Axle Suspension and Transmission System", doi
  51. Simple Modelling and Analysis for Crankshaft Three-Dimensional Vibrations, part 2: Application to an Operating Engine Crankshaft". doi
  52. (1995). Simple Modelling and Analysis for Crankshaft ThreeDimensional Vibrations, part 1: Background and Application to Free Vibrations", doi
  53. The Application of Non-Linear Displacements Modelling Techniques to an Automotive Driveline for the Investigation of Shunt",
  54. The Dynamic Characteristics of Automobile Drivelines",
  55. The Mechanics of Axle Tramping Vibrations", I Mech E, C137/84,
  56. The motor Vehicle", doi
  57. The Nature and Prevention of Axle Tramp", doi
  58. The Optimization of the Vibration of the Vibrational Dynatnic Behaviour of Industrial Vehicle Power Trains",
  59. (1994). Theoretical Study of Structural Modification Control and Analytical Model Reduction of Torsional Vibration in FR-Type Automotive Power Drivetrain", XXV FISITA Congress, Technical Papers, Vehicle Dynamics,
  60. Torsional Vibration Analysis of Tractor and doi
  61. Torsional Vibrations in the Drive Train of Motor Vehicles, Principle Considerations",
  62. Torsional Vibrations in Tractor Power-Take-off Drivelines", IMechE, C134/79,
  63. (1975). Torsional Vibrations of the Driveline of a Vehicle", MSc. Thesis, Granfield Institution of Technology,
  64. Tyre Factors and Front Wheel Vibrations",
  65. Using Gratings in Driveline Noise Problems", IMechE,
  66. Vibration Analysis of Movable Part of Internal Combustion Engine (Part I Crank Shaft)", doi
  67. Vibration Optimisation of Automotive Drivetrains",

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