Modeling of nonlinear torsional vibration of the automotive powertrain

A vibration model of the powertrain can be used to predict its dynamic behavior when excited by fluctuations in the engine torque and speed. The torsional vibration resulting from torque and speed fluctuations increases the rattle noise in the gearbox and it should be controlled or minimized in order to gain acceptance by clients and manufactures. The fact that the proprieties of the torsional damper integrated into the clutch disc alter the dynamic characteristic of the system is important in the automotive industry for design purposes. In this study, bench test results for the characteristics of a torsional damper for a clutch system (torsional stiffness and friction moment) and powertrain torsional vibration measurements taken in a passenger car were used to verify and calibrate the model. The adjusted model estimates the driveline natural frequency and the time response vibration. The analysis uses order tracking signal processing to isolate the response from the engine excitation (second-order). It is shown that a decrease in the stiffness of the clutch disc torsional damper lowers the natural frequency and an increase in the friction moment reduces the peak amplitude of the gearbox torsional vibration. The formulation and model adjustment showed that a nonlinear model with three degrees of freedom can represent satisfactorily the powertrain dynamics of a front-wheel drive passenger car.

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Research on the Method of Circumferential Spring Dual Mass Flywheel Damper Matching with Diesel Engine

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.419-420.65 ◽

2009 ◽

Vol 419-420 ◽

pp. 65-68

Author(s):

Zheng Feng Jiang ◽

Lei Chen

Keyword(s):

Diesel Engine ◽

Torsional Vibration ◽

Torsional Stiffness ◽

Vibration Damper ◽

Passenger Car ◽

Inertia Coefficient ◽

New Type ◽

Working Principle ◽

Relationship Of ◽

The Relationship

As a new type of torsional vibration damper, a Dual Mass Flywheel (DMF) has different configuration and working principle from the traditional clutch. Focusing on the problem of matching DMF with a diesel engine, the relationship of circumferential spring dual mass flywheel (CS-DMF) and gearbox is analyzed based on a multi-freedom model, and then the methods of gearbox selection, rotary inertia coefficient ascertain and optimization of torsional stiffness are proposed in this paper. The methods have been applied to a CS-DMF matching with a passenger car with diesel engine. Modal simulation and torque fluctuating experiment show the CS-DMF has excellent damping performance.

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Decoupled Engine for Exterior-Noise Reduction an a Lower-Mid-Class Front-Wheel-Drive Passenger Car

10.4271/870633 ◽

1987 ◽

Cited By ~ 2

Author(s):

H.-J. Oberg ◽

D. Pundt ◽

H. A. Fachbach

Keyword(s):

Noise Reduction ◽

Front Wheel ◽

Passenger Car ◽

Wheel Drive

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Exploration of a New Leaned Blade Flat Hydrodynamic Torque Converter

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.37-38.457 ◽

2010 ◽

Vol 37-38 ◽

pp. 457-461

Author(s):

Xi Lin Zhu ◽

Chun Bao Liu ◽

Wen Xing Ma ◽

Xiao Qiang Wu

Keyword(s):

Power Transmission ◽

Torque Converter ◽

Front Wheel ◽

Practical Significance ◽

Effective Diameter ◽

Passenger Car ◽

The Core ◽

Wheel Drive ◽

Flat Shape ◽

Engine Power

Regarding front-wheel drive passenger car, because of the limit of power transmission system space, a torque converter was developed to the flat shape. In this paper, a leaned blade flat torque converter was developed with an increasingly narrower torus's profile for the purpose of achieving a smaller axial size. It is composed of a pump having a leaned pump blade, a turbine having a leaned turbine blade and a stator, and the flatness ratio is 0.21. The core of the pump blade's inlet and outlet is opposite separately in the shell and moves 1/3 cascade spacing along the pump's hand of rotation. The core of the turbine blade's inlet and outlet is opposite separately in the shell along the turbine revolving and go astern 1/3 cascade spacing. The computational results indicate that the torque ratio decreases slightly but the torus is more flat when the blade is leaned. And the capacity factor decreases, the nominal torque improves, it may use the small effective diameter to satisfy the match request of passenger car with the same engine power, and it has more vital practical significance to solve the question of front-wheel drive layout's limit.

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The Influence of Torsional Damper Performance Parameter on Transmission System Torsional Vibration

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.241-244.2015 ◽

2012 ◽

Vol 241-244 ◽

pp. 2015-2018

Author(s):

Wen Ku Shi ◽

Guang Ming Wu ◽

Shi Da Nie ◽

Shi Chao Wang ◽

Zhi Yong Chen

Keyword(s):

Torsional Vibration ◽

Forced Vibration ◽

Theoretical Basis ◽

Degrees Of Freedom ◽

Transmission System ◽

Torsional Stiffness ◽

Vibration Model ◽

Rotational Vibration ◽

Positive Meaning ◽

Stiffness And Damping

In order to research the influence that the torsional stiffness and damping characteristic of the torsional damper had on the transmission rotational vibration, a multi-degrees-of-freedom model of torsional vibration of a transmission system of an FR type vehicle was built. The frequency of the torsional vibration model of transmission system was calculated, and the forced vibration in the transmission was analyzed; the sensitivity of the torsional stiffness and damping characteristic of the torsional damper on vibration response was researched. This method provides theoretical basis for solving the transmission system rotational vibration of the vehicle, and it has positive meaning in the development of the rear drivetrain NVH.

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Rating forces grip and driving and accelerations of the car with drive different configuration

Journal of Konbin ◽

10.1515/jok-2015-0057 ◽

2015 ◽

Vol 36 (1) ◽

pp. 65-78

Author(s):

Mariusz Kowalski

Keyword(s):

Adhesive Strength ◽

Driving Force ◽

Rear Axle ◽

Front Wheel ◽

Drive System ◽

Passenger Car ◽

Wheel Drive ◽

Drive Systems ◽

Four Wheel Drive ◽

Mathematical Relations

Abstract The paper shows a typical drive systems used in today's vehicles, mainly cars. Approximated scheme of the formation of the driving force of the vehicle and the necessary mathematical relations for the calculation. For example, a typical passenger car BMW 320 was analyzed and calculations obtained a driving force, of adhesion and acceleration. The calculations were performed for the drive system, the classical (i.e. the rear axle of the vehicle) for front-wheel drive and four-wheel drive (4×4). Virtually assumed that to the above mentioned vehicle it is possible buildings of each of said system. These are shown graphically in diagrams bearing a distribution of the forces acting on the substrate and the reactions - the data necessary for the calculations. The resulting calculation is graphically shown in the diagrams, in which is illustrated a change value of the resulting adhesive strength, and the acceleration depending on the drive type vehicle.

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Torsional Vibration Dynamics Modeling and Simulation Research on Harvester

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.443.160 ◽

2013 ◽

Vol 443 ◽

pp. 160-163

Author(s):

Zhan Guo Wei

Keyword(s):

Modeling And Simulation ◽

Natural Frequency ◽

Torsional Vibration ◽

Power Transmission ◽

Torsional Stiffness ◽

Dynamics Modeling ◽

Dynamics Model ◽

Simulation Research ◽

Torsion Effect ◽

Vibration Dynamics

building picking mechanical torsional vibration dynamics model, carries on the equivalent moment of inertia, equivalent torsional stiffness calculation, torsional system intrinsic characteristics are analyzed, and the programming, the Harvester power transmission system of each order natural frequency and engine low harmonic times incentive relations, so as to make the vehicle torsion effect effectively restrain.

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Directional Stability of a Front Wheel Drive Passenger Car with Preemptive Use of the Direction Sensitive Locking Differential (DSLD)

Lecture Notes in Mechanical Engineering - Advances in Dynamics of Vehicles on Roads and Tracks ◽

10.1007/978-3-030-38077-9_147 ◽

2020 ◽

pp. 1271-1277

Author(s):

Mathias Lidberg ◽

Jonas Alfredson

Keyword(s):

Front Wheel ◽

Passenger Car ◽

Directional Stability ◽

Wheel Drive

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Study on the Method of Online Adaptive Adjustment Method for Torsional Vibration Model of Turbine Shafting

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.602-605.684 ◽

2014 ◽

Vol 602-605 ◽

pp. 684-688

Author(s):

Xi He ◽

Yu Jiong Gu

Keyword(s):

Natural Frequency ◽

Torsional Vibration ◽

Taylor Expansion ◽

Torsional Stiffness ◽

Adaptive Function ◽

Adaptive Process ◽

Vibration Model ◽

Adaptive Adjustment ◽

The Difference ◽

Analysis System

The accuracy of safety analysis can be guaranteed when the torsional vibration model is adjusted online according to the inherent characteristics of the torsional vibration of the shafting. Torsional stiffness of model is set as the object for adjustment. The sensitivity of the natural frequency of torsional vibration model to structure parameters is analyzed and the sensitivity of the natural frequency of torsional vibration model to torsional stiffness is calculated. According to the difference between the natural frequency of torsional vibration which is get from actual shafting and the natural frequency of torsional vibration which is calculated by torsional vibration model, the adaptive adjustment of the torsional stiffness of mode is solved by using the method of Taylor expansion which ignore two times or more correction. The logic structure of the adaptive process of torsional vibration model is designed and the online adaptive function of torsional vibration model is implemented in the torsional vibration safety and analysis system. The torsional vibration modelof 1000WM turbogenerator is used as an example and the accuracy of the method is verified.

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