Conceptual Design of Road Vehicles Related to Dynamics

Mastinu, Giampiero

doi:10.1201/b15560-14

Cited by 12 publications

(31 citation statements)

References 35 publications

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“…The test obstacles that have deterministic geometric profiles include cleat, vertical rail, pothole, jump bump/depression, and lane groove. 10,18 These obstacles are modeled by basic mathematical functions. For example, a step function could be used for modeling of a cleat.…”

Section: Synthetic Road Surface Profilementioning

confidence: 99%

“…To assess and optimize the capability of suspension system, both objective (quantitative) and subjective (qualitative) methods could be used. 2,10,21…”

Section: Evaluation and Optimization Of The Modelmentioning

confidence: 99%

“…For a human body exposed to whole body vibration, different resonances exist at frequencies above 3 or 4 Hz. 10,21 Hence, it could be deduced that the best ride quality associated with the most comfortable human experience is achieved when the main resonance of the chassis happens below 3 Hz.…”

Section: Evaluation and Optimization Of The Modelmentioning

confidence: 99%

“…Comparatively, for handling analysis, the steering controllability and lateral-yaw stability of the vehicle are the two main issues. 6,10 The main motions affecting the handling behavior are high-magnitude low-frequency longitudinal (surge), lateral (sway), yaw, and roll motions of the vehicle chassis.

Figure 1.Road inputs and dynamic responses of a road vehicle’s ride model. …”

Section: Introductionmentioning

confidence: 99%

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Dynamic response multiobjective optimization of road vehicle ride quality—A computational multibody system approach

Mohajer

Asayesh

Nahavandi

2016

Proceedings of the Institution of Mechanical Engineers, Part K:

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Computational multibody system (MBS) method is a practical technique utilized for modeling, simulation, and optimization of mechanical systems. In the methodology of computational multibody system, equations of motion are derived, formulated, and solved through a systematic, generalized, and well-structured computational-mathematical approach. In this paper, the computational multibody system formulation, based on the appended Lagrangian method, is implemented to establish the governing equations of ride dynamics for a nonlinear ride model that represents a versatile half-car twotrack model of a road vehicle. The input to the system is a simulated road surface model based on the ISO road surface classification. The solution of the equation of motion is obtained using the direct integration approach along with constraint violation elimination and control techniques. Following the simulation, a time-domain multiobjective design optimization procedure is performed to improve the ride quality of the model. The ride quality comprises both ride comfort and ride safety. The optimization considers relevant objective functions including vibration isolation, suspension travel, road holding, and force index. The results of work show that the proposed method could acceptably estimate the optimal values of design variables for specific road classes and vehicle driving speeds. The simulation-based ride quality optimization performed here could facilitate improvement of suspension and tyre.

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Section: Synthetic Road Surface Profilementioning

confidence: 99%

“…To assess and optimize the capability of suspension system, both objective (quantitative) and subjective (qualitative) methods could be used. 2,10,21…”

Section: Evaluation and Optimization Of The Modelmentioning

confidence: 99%

Section: Evaluation and Optimization Of The Modelmentioning

confidence: 99%

Figure 1.Road inputs and dynamic responses of a road vehicle’s ride model. …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic response multiobjective optimization of road vehicle ride quality—A computational multibody system approach

Mohajer

Asayesh

Nahavandi

2016

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…For primary ride frequencies up to 5 Hz are usually considered, continued by secondary ride up to about 25 Hz. 4 As an example, road-induced vibrations of the engine may lead to engine stutter, which has to be supported by the EMS.…”

Section: Introductionmentioning

confidence: 99%

Mode decoupling concepts of an engine mount system for practical application

Angrosch

Plöchl

Reinalter³

2015

Proceedings of the Institution of Mechanical Engineers, Part K:

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In recent years, appropriate engine mount system design has become increasingly important due to a consistent trend towards lighter car bodies combined with more power-intensive engines and often lower idle speed. Decoupling dominant vibration directions of the engine-gearbox assembly (EGA) from input excitation direction, in particular based on elastic axis decoupling and torque roll axis decoupling concepts, are often referred to in literature. However, their practical application remains scarce. Hence, multi-body system dynamics simulation and numerical optimization is used in order to introduce an easily applicable implementation of the referred concepts. Therefore, the modal kinetic energy distribution of the EGA with respect to physical directions is considered. Effects of coupling or decoupling of EGA eigenmodes regarding engine-excited (e.g. from engine run-up or idling) as well as road-induced vibrations (e.g. from rough road or cobblestones) are addressed in an engine mount system parameter design study for a small-sized engine. Decoupling modal kinetic energy fractions of all rigid body modes considerably reduces effects from engine-excited vibrations, while strong coupling might offer benefits for road-induced vibrations. As modal kinetic energy fractions can easily be varied by means of optimization and/or by using findings from correlation coefficients derived with design of experiment methods, the adaptation of design parameters (mount positions and inclinations, stiffnesses, and loss angles) is possible in a quite straightforward manner for an effective compromise.

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Straight-ahead running of road vehicles – analytical formulae including full tyre characteristics

Mastinu

Lattuada

Matrascia

2018

Vehicle System Dynamics

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During straight-ahead running, the longitudinal axis of road vehicles, notably cars, is not parallel to road axis. This occurrence is general and is due both to road cross slope (road banking) and to tyre characteristics, particularly ply-steer and conicity. In order to describe such a phenomenon, the paper develops a new and relatively simple analytical model. Despite the model is linear, the solution which is provided is exact, since straight-ahead motion occurs with small angles and both the elastokinematics of suspension system and tyre characteristics can be modelled by linearised equations.The Handling Diagram theory is updated and completed by introducing the actual shifts of tyre characteristics influencing running at vanishing lateral acceleration.The validation of the analytical expressions is performed by using a MSC Adams TM full model of a car. The lateral drift coming from the null steering manoeuvre is simulated by both the simple model and the full MSC Adams TM model, with satisfactory results. The same two models are used to simulate successfully the weave test.A subjective-objective experimental test campaign provides preliminary substantiation of the ability of the derived formulae to describe tyre performance.By means of the unreferenced analytical formulae developed in the paper, we allow, given the vehicle, the proper tyre design specification, and vice-versa. In particular, a formula is given to make null the steering torque during straight-ahead driving. The derived analytical formulae may provide a sound understanding of the straight-ahead running of road vehicles.

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Conceptual Design of Road Vehicles Related to Dynamics

Cited by 12 publications

References 35 publications

Dynamic response multiobjective optimization of road vehicle ride quality—A computational multibody system approach

Dynamic response multiobjective optimization of road vehicle ride quality—A computational multibody system approach

Mode decoupling concepts of an engine mount system for practical application

Straight-ahead running of road vehicles – analytical formulae including full tyre characteristics

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