scholarly journals Dynamic input loads evaluation of a recreational vehicle frame using multibody dynamics hybrid modeling validated with experimental and full analytical modeling data

2021 ◽  
Vol 13 (8) ◽  
pp. 168781402110346
Author(s):  
Carl Blanchette ◽  
Maxime Boisvert ◽  
Nicolas Joubert ◽  
Denis Rancourt ◽  
Alain Desrochers
Keyword(s):  
Load Path ◽  
Tyre Model ◽  
The Road ◽  
Force Transducers ◽  
Multibody Dynamic ◽  
Vehicle Structure ◽  
Measurement Units ◽  
Modeling Data ◽  
Tire Models ◽  
Load Evaluation

Knowledge of frame loads at the limits of the intended driving conditions is important during the design process of a vehicle structure. Yet, retrieving these loads is not trivial as the load path between the road and the frame mounting point is complex. Fortunately, recent studies have shown that multibody dynamic (MBD) simulations could be a powerful tool to estimate these loads. Two main categories of MBD simulations exist. Firstly, full analytical simulations, which have received great attention in the literature, are run in a virtual environment using a tire model and a virtual road. Secondly, hybrid simulations, also named semi analytical, uses experimental data from Wheel Force Transducers and Inertial Measurement Units to replace the road and tire models. It is still unclear how trustworthy semi analytical simulations are for frame load evaluation. Both methods were tested for three loads cases. It was found that semi analytical simulations were slightly better in predicting vehicle dynamic and frame loads than the full analytical simulations for frequencies under the MF-Tyre model valid frequency range (8 Hz) with accuracy levels over 90%. For faster dynamic maneuvers, the prediction accuracy was lower, in the 50%–80% range, with semi analytical simulations showing better results.

Modal Analysis of a Utility Bicycle From the Perspective of Riding Comfort

2019 ◽  
Author(s):  
Alberto Doria ◽  
Edoardo Marconi ◽  
Pierluca Cialoni
Keyword(s):  
Modal Testing ◽  
Vibration Modes ◽  
Response Functions ◽  
The Road ◽  
Power Spectral ◽  
Vehicle Structure ◽  
Power Spectral Densities ◽  
On The Road ◽  
The Relationship ◽  
Insight Into

Abstract The correlation between the modal properties and the comfort characteristics of a utility, step-through frame bicycle are investigated. In-plane modal testing of the vehicle is carried out both without and with the rider, and the major differences between the results obtained with the two conditions are highlighted. In order to have an insight into the contribution of the various bicycle components to the transmission of vibrations, the frequency response functions (FRFs) between the main interface points in the vehicle structure are measured and studied. Finally, the modal characteristics are compared with road tests data, emphasizing the relationship between the in-plane vibration modes and the main peaks in the acceleration power spectral densities (PSDs) measured on the road.

Research of Modern Railway Vehicle Structure Fatigue Design Method Based on Multibody Dynamic Simulation

2010 ◽  
Vol 118-120 ◽  
pp. 327-331 ◽  
Author(s):  
Bing Rong Miao ◽  
Wei Hua Zhang ◽  
L.M. Zhang ◽  
Tao Zhu ◽  
H.T. Yin
Keyword(s):  
High Speed ◽  
Optimization Problems ◽  
Design Method ◽  
Parallel Optimization ◽  
Railway Vehicle ◽  
Local Vibration ◽  
Integrated Method ◽  
Durability Analysis ◽  
Multibody Dynamic ◽  
Vehicle Structure

For high-speed railway carbody structure durability analysis problems in China, one integrated method based on MBS (multibody simulation) is proposed here. Firstly, one EMU (Electricity Multiple Unit) full vehicle was performed to dynamic modeling and simulation. The numerical simulation results were applied to illustrate the vehicle dynamic characteristics. And the relationships between structural strength, stiffness, and frequency characteristics were also studied. Secondly, the multidisciplinary design technique was used to solve multi-mode coupled vibration of carbody structure on the cumulative effects of local vibration and damage effects, as well as structure light-weighting and other parallel optimization problems. Finally, the effective measures were proposed to control carbody structure’s physical failure.

Way Forward to Halt Pressure Loss in Automotive Tyres

2015 ◽  
Vol 761 ◽  
pp. 510-514
Author(s):  
M.J. Raguvaran ◽  
Sivaraos ◽  
M.A. Amran ◽  
T. Joseph Sahaya Anand ◽  
Qumrul ◽  
...  
Keyword(s):  
Pressure Loss ◽  
Permeation Rate ◽  
Sudden Loss ◽  
The Road ◽  
Wide Range ◽  
Vehicle Structure ◽  
Acoustic Comfort ◽  
On The Road ◽  
Natural Pressure ◽  
Air Permeation

Tyre is one of the most crucial components in a vehicle structure not only to have the vehicle running smoothly on the road, but also to provide physical and acoustic comfort for the passengers. But, since the day the inflatable tyres were invented, sudden loss of air in a tyre acts as a major problem associated with tyres; and are still being treated to date by professional researchers and giant tyre manufacturers. The phenomena where tyre experiences natural pressure loss over the time is called air permeation which causes tyre to deflate on its own. Besides reviewing the primary theories and findings that contribute to natural air permeation that literally causes the pressure drop of an automotive tyre, this paper also reveals the experimentally validated results of the significant factor which contributes to air permeation of an automotive tyre. Additionally, a relevant nanobased solution to reduce the air permeation rate to stop the tyre deflation is also highlighted to establish the way forward total solution suiting wide range of tyres used on domestic cars.

scholarly journals THE ROLE OF A TIRE IN VEHICLE AND ROAD INTERACTION

Transport ◽  
2002 ◽  
Vol 17 (2) ◽  
pp. 39-45 ◽  
Author(s):  
Arūnas Rutka ◽  
Jonas Sapragonas
Keyword(s):  
Surface Texture ◽  
Road Surface ◽  
Smoothing Function ◽  
The Road ◽  
Surface Description ◽  
Tire Models ◽  
Narrow Ring

Major difficulties in road surface description lies in the evaluation of the tire and road interaction. Main purpose of this paper is to analyse the influence of the tire in vehicle and road interaction with the purpose to choose more commons, but enough precise tire models. Data of profile used in investigations were measured in real roads. For the investigation of the tire's smoothing function two models were used: flexible narrow ring-2D estimates the tire and road contact in a line and flexible band-3D estimates dimensional contact between the road and tire. Results of computations are presented in figures. There were determinate that tire does not fully smooth irregularity of surface texture level.

scholarly journals Design of a Submarine Vehicle for Higher Natural Frequency Using U∗ Index Theory Approach

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Weiyan Shang ◽  
Qingguo Wang
Keyword(s):  
Natural Frequency ◽  
Load Transfer ◽  
Excitation Frequency ◽  
Index Theory ◽  
Theory Approach ◽  
Original Design ◽  
The Road ◽  
Index Approach ◽  
Vehicle Structure ◽  
Design Paradigm

The natural frequency of a vehicle structure should be far higher than the road excitation frequency in order to avoid dynamic problems caused by structural resonance. Submarine vehicles or robots are facing the same issue as mentioned above. This paper proposed a means to effectively increase the natural frequency of submarine vehicles or robots by using U∗ index approach. The U∗ theory was originally introduced to investigate load transfer paths within a structure. It is a new design paradigm for vehicle structures. In this study, the U∗ index theory was applied to evaluate the internal stiffness distribution of a submarine vehicle structure and then a modified design was achieved based on the U∗ analysis. Compared to the original design, the natural frequency of the modified vehicle structure was increased by more than 40% while the weight of the modified vehicle was only raised by 4.6%.

Evaluation of vehicle-based tyre testing methods

2018 ◽  
Vol 233 (1) ◽  
pp. 4-17 ◽  
Author(s):  
Anton Albinsson ◽  
Fredrik Bruzelius ◽  
Bengt Jacobson ◽  
Egbert Bakker
Keyword(s):  
Development Process ◽  
Simulation Models ◽  
Lateral Force ◽  
Road Surface ◽  
Passenger Cars ◽  
Tyre Model ◽  
The Road ◽  
Full Vehicle ◽  
Physical Testing ◽  
Experimental Vehicle

The demand for reduced development time and cost for passenger cars increases the strive to replace physical testing with simulations. This leads to requirements on the accuracy of the simulation models used in the development process. The tyres, the only components transferring forces from the road to the vehicle, are a challenge from a modelling and parameterization perspective. Tests are typically performed on flat belt tyre testing machines. Flat belt machines offers repeatable and reliable measurements. However, differences between the real world road surface and the flat belt can be expected. Hence, when using a tyre model based on flat belt measurements in full vehicle simulations, differences between the simulations and real prototype testing can be expected as well. Vehicle-based tyre testing can complement flat belt measurements by allowing reparameterization of tyre models to a new road surface. This paper describes an experimental vehicle-based tyre testing approach that aims to parameterize force and moment tyre models compatible with the standard tyre interface. Full-vehicle tests are performed, and the results are compared to measurements from a mobile tyre testing rig on the same surface and to measurements on a flat belt machine. The results show that it is feasible to measure the inputs and outputs to the standard tyre interface on a flat road surface with the used experimental setup. The flat belt surface and the surface on the test track show similar characteristics. The maximum lateral force is sensitive to the chosen manoeuvres, likely due to temperature differences and to vibrations at large slip angles. For tyre models that do not model these effects, it is vital to test the tyres in a manoeuvre that creates comparable conditions for the tyres as the manoeuvre in which the tyre model will be used.

Efficient Acquisition of Tire Data and Its Application in Vehicle Handling Simulation

2012 ◽  
Vol 40 (4) ◽  
pp. 234-245 ◽  
Author(s):  
Henning Olsson ◽  
Emmanuel Hugon ◽  
Claude Rouelle
Keyword(s):  
Laboratory Testing ◽  
Vehicle Performance ◽  
Vehicle Handling ◽  
Simulation Methodology ◽  
Tire Force ◽  
Handling Characteristics ◽  
Force Transducers ◽  
Design Changes ◽  
Tire Models

ABSTRACT: Tire force and moment data can be collected from laboratory testing or track testing using wheel force transducers. The data can then be used to generate semiempirical tire models. Examples of the two methods are presented; differences in the results between the two methods are discussed. With novel simulation methodology, tire models have been used to successfully predict vehicle handling characteristics. The influence of tire design changes on overall vehicle performance can quickly be evaluated both in terms of on-center stability and at the limit balance.

Capturing Planer Tire Enveloping Properties Using Static Constraint Modes

2006 ◽  
Author(s):  
John B. Ferris
Keyword(s):  
Elastic Foundation ◽  
Nonlinear Dynamic ◽  
Recursive Algorithm ◽  
Road Surface ◽  
Geometric Constraints ◽  
New Method ◽  
Tire Model ◽  
The Road ◽  
Road Surfaces ◽  
Tire Models

This work establishes a new method for predicting the deformed shape of a tire with unilateral geometric constraints imposed by the road surface. Specifically, a method is developed for determining the static constraint mode that captures the planer enveloping properties of a tire for uneven road surfaces. This new method uses a recursive algorithm for determining which geometric constraints are active. A simple planer tire model, described by a linear ring on an elastic foundation, is used to demonstrate the method. The result of this method is a set of active geometric constraints on the tire and the static constraint modes that compose the deflection of the tire along its circumference. The success of the method is demonstrated by an example. This work forms the basis for developing nonlinear dynamic tire models that accurately account for active, unilateral, geometric constraints on the tire.

Gradient Load Evaluation of Chassis Frame Mounted Specialised Structure Designed for Heavy Off-Road Vehicles

2016 ◽  
Vol 8 (2) ◽  
Author(s):  
V.R. Deulgaonkar
Keyword(s):  
Strain Measurement ◽  
Load Variations ◽  
The Road ◽  
Measurement And Analysis ◽  
Experimental Strain ◽  
Cross Country ◽  
Specialized Structure ◽  
Load Evaluation ◽  
Sufficient Strength ◽  
Closed Environment

Chassis mounted structures provide a levelled base to the transport vehicles intended for on-road and off-road driving. These structures acts as cushioning elements to sophisticated cargos like intelligent tracking systems placed in shelters closed environment. These structures need sufficient strength and rigidity to withstand the load variations arising from tire-road interactions during rough road travel. Such structures need special attention during the design phase itself in order to improve the specified payload carrying capacity with optimized dimensions. Present paper focuses on formulation of a specialized structure mounted on chassis intended to carry shelters. A scaled prototype is manufactured and tested for different grade-load combinations. This is done through experimental strain measurement and analysis of the results. The data is acquired for nine different load magnitudes and is categorised into three sets as low, moderate and high magnitudes. Interrelation between the stress/strain values acquired during each load and gradient state is developed. The structure behaviour is hypothesized through the gradient strain measurement outcomes. Major design concerns include the spacing and orientation of cross-members, load locations on the structure and the road profiles. Cross-country and rough road terrain behaviour of the structure is attempted in present work.

Numerical Characterization and Validation of Vehicle Collisions

2008 ◽  
Vol 385-387 ◽  
pp. 153-156
Author(s):  
Alfonso Grimaldi ◽  
Alessandro Soprano ◽  
Francesco Caputo
Keyword(s):  
Numerical Data ◽  
Road Accident ◽  
Vehicle Collisions ◽  
The Road ◽  
Numerical Characterization ◽  
Vehicle Impact ◽  
Vehicle Structure ◽  
Impulsive Model ◽  
The Impact

In the recent years the road accident analysis has been one of the main fields of research for automotive engineering, because of the heavy costs which Europe has to sustain each year in terms of injuries, fatalities and related costs. In this paper, starting from an impulsive model available in literature, a numerical characterization of vehicle collisions and deformation process is proposed and validated, identifying the main parameters which describe the vehicle impact behaviour. The study, conducted by using both empirical and numerical data (simulated trough Ls- Dyna), analyses the impact process by considering several situations, with different severity and geometry of impact; furthermore, with reference to the main parameters which describe the vehicle behaviour in the impact, the authors present a wide analysis, classified according to the severity of impact and to the different parts of the vehicle structure which absorb the impact energy.

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