Suspension Parameter Measurements of Wheeled Military Vehicles (original) (raw)
Related papers
2014
This paper describes the VIPER II, the Vehicle Inertia Parameter Evaluation Rig, developed by SEA, Ltd at the request of the US Army’s Tank Automotive Research, Development and Engineering Center (TARDEC). The previous machine was the VIPER I, built in 2000. The new machine is built to measure vehicle center-of-gravity height, the pitch, roll, and yaw moments of inertia, and the roll/yaw cross product of inertia. It is made to test nearly all of the Army’s wheeled vehicles, covering a range of weights from 3000 to 100,000 lbs, up to 150 inches in width and up to 600 inches in length. Commercial vehicles could also be tested. The machine was installed in March, 2014 in the TARDEC facility in Warren, MI. The paper describes the need for such measurements, the basic features of the machine, the test procedure, and the results of early testing. The design specification for accuracy was 3% for all measurements, but the actual VIPER II accuracy is usually better than 1%.
A Laboratory Automotive Suspension Test Rig: Design, Implementation and Integration
2017
In the present paper, a laboratory test rig is designed and constructed at Hashemite University to study and analyze the effects of road terrains on automotive suspension systems. It is also used to study and analyze the nonlinear dynamic behavior of suspension systems. The proposed experimental suspension setup facilitates testing and validating various identification and controller designs. Hence, a useful educational, training, and research tool is introduced to emulate the effects of wide range of realistic road conditions on automotive suspension systems, while rapidly measuring, recording, and analyzing system variables. It should be noted that the focus of this paper is on the design and construction of a laboratory automotive suspension system test rig. Experimental testing is intended to be conducted in the future to practically demonstrate the performance of vehicular suspension under different operating modes.
International Journal of Transport Development and Integration
The stability of a vehicle (especially if operating off-road, such as a farm tractor, possibly with an implement attached) can be statically investigated by means of a test installation such as the one described here. It consists of a platform (dimensions: 6.42 × 4.46 m) having two degrees of freedom (inclination, rotation) and on which the vehicle is positioned motionless. By acting on these degrees of freedom, it is possible to precisely and simultaneously control all the characteristic angles of a vehicle (roll, pitch, yaw), thus discovering, in complete safety, its operational limits (i.e. its incipient rollover conditions). Furthermore, the ability to misalign up to two of the four quadrants composing the platform allows the testing of further critical situations for the vehicle, in which the front-axle pivot joint and the tyres elasticity are involved, potentially up to a scenario in which the vehicle rests on only three of its four supports and its support polygon degenerates into a triangle. The basic test scenarios that can be investigated with this installation allow the study of many aspects of a vehicle, pertaining both to the general chassis performance of the vehicle (therefore related to its balance) and to the load state of some specific components (internal or interfacing the vehicle with the outside, e.g. the wheels). The obtained data, referred to reference test scenarios, allow the experimenters to: (1) interpret sensors readings in real operating situations, thus including also the contribution of the tyres vertical flattening and lateral deflection, (2) complete the safety documentation at the users' disposal with some specific graphs, the vehicle 'equilibrium maps' (or 'stability charts'), possibly referred also to the vehicle with some accessories/implements connected to it. By demonstrating the undeniable usefulness of such an installation, the authors hope to propose new testing paradigms with the ultimate aim of increasing the overall safety of vehicles and, particularly, of agricultural and work machinery.
SUSPENSION PARAMETERS ESTIMATION OF A RWD VEHICLE Suspension Parameters Estimation of a RWD Vehicle
In this work, an inverse problem approach is employed to estimate the suspension parameters of a light vehicle based on field tests. The modeling process of a rear-wheel drive (RWD) vehicle is depicted. The model considers only the vertical dynamics of the vehicle. The experimental data were measured by sensors installed on the vehicle during specific road tests in a proving ground. The inverse problem is solved by using the Particle Swarm Optimization (PSO), minimizing the quadratic error between experimental data and numerical results of the vehicle simulation. Accuracy, computational time, efficiency and efficacy of the model were compared regarding the behavior of the performance responses of the vehicle measured on the road tests. Throughout this process, the vehicle model was validated to be used in future studies of vehicle dynamics.
IRJET- THE KINEMATICS AND COMPLIANCE TEST ON A SUSPENSION SYSTEM USING ADAMS CAR
IRJET, 2020
The experimental approach is usually used as the way to develop or modify a suspension system to obtain maximum ride comfort and handling characteristics. This approach is a time-consuming process, costly, and may not guarantee the optimum solution. Thus, to avoid this, a virtual vehicle suspension system is necessary. In this paper, a half-car body of an actual suspension system based on a four wheel vehicle was modeled and simulated. In total, 10 components consisting of different joint types and a number of degrees of freedom. The model was developed by defining the location of the hard point or coordinate before specifying the component characteristics and joint type. The completed suspension model was simulated using the vertical parallel movement test. Integral-link suspension modeling and simulation was carried out using ADAMS/Car. Toe, camber and caster variation with respect to vertical displacement of the wheel are obtained and the curve trends are compared with the existing model for validating the concept model.
International Journal of Vehicle Safety, 2013
The present study exposes an analysis of the suspension system technical state evaluation for civil vehicles that have been subject to armouring processes. Such evaluation is performed through a mechanised revision established by state regulation and is based on the method defined by EuSAMA. The development of this analysis focuses on establishing the existing relation between the ballistic resistance integrated to a vehicle and the dynamic effect exercised for the modification of its mass, according to two reliability/safety driving measurement criteria: (i) tyre-road adhesion index and (ii) tyre excitation phase angle. The study proposes new elements to the current procedure established to evaluate the suspension of civil armoured cars considering the two measurement criteria, which can be acquired by a standard commercial suspension tester machine.
Developing a Test Site for Testing the Suspension of Vehicles with Omnidirectional Wheels
2020
The paper presents a test site for determining the excitations that occur as a result of the contact between the omnidirectional wheel and the road and affect the single suspension column in motor vehicles. The specific nature of these excitations during the movement of omnidirectional wheels is caused by the irregular envelope of the wheel. The proposed test site enables to determine the vertical displacements of the wheel that is rolling along the paving of the road. The conducted experiment demonstrates that the test site was constructed correctly.
Analysis of vehicle’s suspension's dynamic responses during test track rides and real exploitation
2018
The following paper presents a study of dynamic responses of a passenger vehicle in typical exploitation conditions. It describes the process of acquiring data from the test rides and their further analysis using statistical values using MatLab. The analysis focuses on accelerations of sprung and unsprung mass, suspension deflection and its speed, comparing the values achieved on different road surfaces, taking into account safety limits and suspension characteristic. The data acquired are presented as graphs of density of probability and cumulative empirical probability, as well as tables listing dynamic responses undergoing analysis. The results allow for estimation of expected dynamic responses of a vehicle, thus making the preparation of future experiments more thorough. Keywords:suspension, dynamic responses, kinematic excitation
Observation of Automobile Suspension Systems: Modeling and Definition of Parameters
The automotive industry experiences increasing competition in its market and requires alternative strategies to advance its products. To meet this objective, one of the investments auto companies have been exploring into is new and improved suspension systems. Suspension systems not only improve comfort for the driver and performance of the vehicle, but also slows down the wear of the car. This paper discusses the conventional suspension system arrangement involving a static spring and its effects on a vehicle traveling over a bump with given parameters. The study will be further expanded to analyze the appropriate spring and damper constants and relate the effects of the suspension system has on a traveling vehicle.
ESTIMATION OF PRIMARY SUSPENSION PARAMETERS FROM LATERAL DYNAMIC RESPONSE OF A WHEELSET
Globally, maintenance tasks for railway vehicles have generally calendar based schedules. However, apparent changes may occur in vehicle structure and environment. Suspension malfunction and substantial change in adhesion conditions can be given as an example for such situations. Since these kinds of changes may affect especially safety, necessary actions must be taken as soon as possible without waiting schedule. This is possible with condition monitoring systems, which lead vehicles to be smarter, as they can inform decision makers for actions. Dynamic response of a vehicle, which includes information about changes in vehicle's structure and environment, can be used for condition monitoring. In this study, a condition monitoring scheme is proposed to identify primary lateral suspension parameter from dynamic response of a wheelset. Identification is based on the well-known model based filtering method, namely unscented Kalman filter.