Center for Vehicle Systems and Safety (CVeSS)
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The Center for Vehicle Systems and Safety (CVeSS) at Virginia Tech was established in 2004 by Dr. Mehdi Ahmadian, professor of Mechanical Engineering, and director of CVeSS. The center consists of four laboratories: The Advanced Vehicle Dynamics Laboratory (AVDL, established 1995), Vehicle Terrain Performance Laboratory (VTPL, established 2006), Performance Engineering and Research Laboratory (PERL, established 2006) and Railway Technologies Laboratory (RTL, established 2004). The center is served by five full-time faculty, more than twenty graduate students, a large number of undergraduate students and technical personnel. Several other Virginia Tech faculty members and visiting scholars are CVeSS affiliate faculty.
Through its affiliated labs, CVeSS is engaged in a wide variety of research ranging from advanced vehicle suspensions, to measurement and modeling of terrain and terramechanics, to biodynamics, to dynamic control of vehicle systems, to vehicle stability and rollover anlysis. The research at CVeSS is broad. It encompasses a myriad of analytical, modeling, and experimental work. We work closely with our sponsors to come up with ways and methods of improving their existing and future products, improve their market share, and ultimately bring added value to their services and products.
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Recent Submissions
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When is it too Late to Brake?
(2022-11)This paper provides a simulation analysis of the braking action that would prevent untripped rollovers of long combination vehicles (LCV) in turns when the entry speed into a turn exceeds the vehicle’s threshold. A ... -
Design and Implementation of a Redress System for Roller Rig
(Virginia Tech, 2022-12-16)The Virginia Tech – Federal Railroad Administration Roller Rig at the Center for Vehicle Systems and Safety is a state of the art facility used to evaluate the wheel-rail contact mechanics and dynamics of railway vehicles ... -
Video Image System Implementation on the Track Crawler Robot
(Virginia Tech, 2022-05-04)The Track Crawler robot at the Center for Vehicle Systems and Safety, in Blacksburg, Virginia, is a state of the art project that is designed to examine the underbelly of trains while in a dormant state. The idea and ... -
Mechanical Design & Fabrication of Redressing System for the VT-FRA Roller Rig
(Virginia Tech, 2022-01-31)At the Center for Vehicle Systems and Safety at Virginia Tech, the Virginia Tech – Federal Railroad Administration Roller Rig is a state of the art facility used in evaluating the wheel-rail mechanics and dynamics of railway ... -
When is it too late to brake?
(Taylor & Francis, 2022-11-22)This paper provides a simulation analysis of the braking action that would prevent untripped rollovers of long combination vehicles (LCV) in turns when the entry speed into a turn exceeds the vehicle’s threshold. A ... -
Simulation Evaluation on the Rollover Propensity of Multi-Trailer Trucks at Roundabouts
(SAE International, 2019-01-01)The main intent of this study is to provide a simulation analysis of rollover dynamics of multi-trailer commercial vehicles in roundabouts. The results are compared with conventional tractor-semitrailer with a single 53-ft ... -
Countering the Destabilizing Effects of Shifted Loads through Pneumatic Suspension Design
(SAE International, 2019-11-08)This article proposes a novel approach to reduce the destabilizing impacts of the shifted loads of heavy trucks (due to improper loading or liquid slosh) by pneumatic suspension design. In this regard, the pneumatically ... -
Detailed Modeling of Pneumatic Braking in Long Combination Vehicles
(SAE International, 2021-08-23)A detailed model for pneumatic S-cam drum brake systems is developed and integrated into a multibody dynamic model for a 33-ft A-double long combination vehicle (LCV). The model, developed in TruckSim®, is used to study ... -
Pneumatically Balanced Heavy Truck Air Suspensions for Improved Roll Stability
(SAE International, 2015-01-01)This study provides a simulation evaluation of the effect of maintaining balanced airflow, both statically and dynamically, in heavy truck air suspensions on vehicle roll stability. The model includes a multi-domain ... -
A simulation-based comparative study on lateral characteristics of trucks with double and triple trailers
(Inderscience Publishers, 2019-01-01)This paper investigates the lateral stability and manoeuvrability in long combination vehicles (LCVs), namely semi-trucks with 28-ft doubles, 28- ft triples, and 33-ft doubles, using TruckSim. In particular, the likelihood ... -
Failure mode and effects analysis of dual levelling valve airspring suspensions on truck dynamics
(Taylor & Francis, 2019-04-03)Failure mode and effects analysis are performed for a dual levelling valve pneumatic suspension to determine the effect of suspension failure on tractor–semi-trailer dynamics, using a detailed model of suspension pneumatics ... -
Achieving anti-roll bar effect through air management in commercial vehicle pneumatic suspensions
(Taylor & Francis, 2019-12-02)This paper introduces the concept of managing air in commercial vehicle suspensions for reducing body roll. A conventional pneumatic suspension is re-designed to include higher-flow air hoses and dual levelling valves for ... -
Comparative Analysis of Emergency Evasive Steering for Long Combination Vehicles
(SAE International, 2020-10-10)This study provides a simulation-based comparative analysis of the distance and time needed for long combination vehicles (LCVs) - namely, A-doubles with 28-, 33-, and 48-ft trailers - to safely exercise an emergency, ... -
A statistical evaluation of multiple regression models for contact dynamics in rail vehicles using roller rig data
(Taylor & Francis, 2022-01-06)A statistical analysis of a large amount of data from experiments conducted on the Virginia Tech-Federal Railroad Administration (VT-FRA) roller rig under various field-emulated conditions is performed to develop multiple ... -
Quantifying the effect of roadway, driver, vehicle, and location characteristics on the frequency of longitudinal and lateral accelerations
(Pergamon-Elsevier, 2021-10-01)The purpose of this study is to understand and quantify the simultaneous effects of roadway speed category, driver age, driver gender, vehicle class, and location on the rates of longitudinal and lateral acceleration epochs. ... -
Isolation Properties of Low-Profile Magnetorheological Fluid Mounts
(MDPI, 2021-04-19)This study evaluates the stiffness and damping characteristics of low-profile magnetorheological (MR) fluid mounts (MRFM) to provide a better understanding of the vibration improvements offered by such mounts, as compared ... -
Imparting motion to a test object such as a motor vehicle in a controlled fashion with improved accuracy
(United States Patent and Trademark Office, 2017-05-09)An apparatus imparts motion to a test object such as a motor vehicle in a controlled fashion. A base has mounted on it a linear electromagnetic motor having a first end and a second end, the first end being connected to ... -
An SMA Passive Ankle Foot Orthosis: Design, Modeling, and Experimental Evaluation
(Hindawi, 2014-06-02)Shape memory alloys (SMAs) provide compact and effective actuation for avariety of mechanical systems. In this work, the distinguished superelastic behavior of these materials is utilized to develop a passive ankle foot ... -
A Review on Eigenstructure Assignment Methods and Orthogonal Eigenstructure Control of Structural Vibrations
(Hindawi, 2009-01-01)This paper provides a state-of-the-art review of eigenstructure assignment methods for vibration cancellation. Eigenstructure assignment techniques have been widely used during the past three decades for vibration suppression ... -
A Novel Double-Piston Magnetorheological Damper for Space Truss Structures Vibration Suppression
(Hindawi, 2014-07-22)The design, fabrication, and testing of a new double-piston MR damper for space applications are discussed. The design concept for the damper is described in detail. The electromagnetic analysis of the design and the ...
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