This paper presents a comparative of different active and semi-active suspension systems in order to research the improvement ride comfort handling stability compared with equivalent passive systems. The two-degrees-of-freedom model (quarter-car model) is employed analysis seven control strategies: LQR-LQG, Robust design, Kalman filter, Skyhook damper, Pole-assignment, Neural network Fuzzy logic. Computer simulations models are performed obtain vertical acceleration sprung mass wheel load...

The main objective of this work is to determine the limit safe driving conditions by identifying maximal friction coefficient in a real vehicle. study will focus on finding method before reaching skid, which valuable information context traffic safety. Since it not possible measure directly, be estimated using appropriate tools order get most accurate information. A vehicle instrumented collect general kinematics and steering tie-rod forces. real-time algorithm developed estimate forces...

A virtual test rig is presented using a three-dimensional model of the elasto-kinematic behaviour vehicle. general approach put forward to determine position body and main parameters which influence handling For design process, variable input data are longitudinal lateral acceleration curve radius, defined by user as goal. optimisation once vehicle has been built, travel four struts steering wheel angle, obtained through monitoring The applied standard validity results proven.

This article deals with the dynamic response optimization of mechanical systems, based on computation independent state sensitivities. Specifically, behavior a coach is analyzed in detail so as to improve its terms handling and ride comfort behaviors. To that end, modeled an 18DOF multibody system, whose equations motion are posed using efficient formulation Maggi's equations. Next, direct-automatic differentiation approach for sensitivities applied. allows one quantify effect 19 design...

An iterative algorithm is proposed for determining the optimal chassis design of an electric vehicle, given a path and reference time. The balances capacity battery pack dynamic properties chassis, seeking to optimize tradeoff between mass its energy consumption, travel variables include geometrical inertial values, as well characteristics powertrain. optimization constrained by slopes, curves, grip, posted speeds different sections track. Particular service constraints are also considered,...

This paper introduces a methodology for the identification of events or potentially dangerous situations in road traffic by extracting information from OBD-II interface. The proposed system identifying hazardous locations includes GNSS positioning system. As such, with use existing navigation systems newly installed equipment, exact geographic location where given risk occurs will be identified.

This paper presents a procedure developed to predict the fatigue life in components made of steel, based on mechanical properties base material and Thermally Affected Zones (TAZs) owing welding. The cycles studied are obtained certain survival probability provided by Weibull distribution. is thought be applied semi-trailer components, therefore it proposed for steels that typically used its manufacturing. A criterion adjustment exponent stress stroke curve welded joints which parameters...

This paper presents a study for assessing the dynamic structural deformations of one most modern, and portable, measurement equipment: Coordinate Measuring Arms (CMAs or AACMMs).The errors derived from use these instruments is still controversial due to certain lack traceability reliability in measurements influence human factor acting on complex 3D structure (with 6 7 degrees-of-freedom).When contact are taken into account, variable originates non-uniform forces, stability, different...

Abstract This paper presents the development of a dynamic model an electric vehicle with motors in all four wheels. The detailed model, is been developed ADAMS® platform. It has 14 degrees freedom and it are included elements actual such as coil springs, telescopic shock absorbers pneumatic validated experimentally vehicle, showing goodness fit. simulator will serve test bed for improving driver pretesting traction stability.

Abstract A new methodology for constructing stability maps (phase-plane analysis) is presented and validated application to complex multibody vehicle models implemented in Multibody Dynamics simulation software (Adams ® ). Traditional methodologies are developed be applied explicit mathematical models. Given the complexity of some special systems, particularly dynamics, simplifications needed apply this analysis technique. The main limitation when using simplified need neglect components...

Abstract A key factor to understand the vehicle dynamic behaviour is know as accurately possible interaction that occurs between tyre and road, since it depends on many factors influence response of vehicle. This paper aims develop a methodology in order characterise tyre–road behaviour, applying obtain grip coefficient. based use simulation virtual model, integrated into genetic algorithm identifies friction coefficient adjust obtained by real data. The numerical model was developed...

This paper presents an optimization methodology applicable to racing car chassis. The proposed procedure is sequentially structured, and starts with analysis of existing vehicle, goes through intermediate prototype finishes a final design. It applied real case, the redesign steel tubular chassis for ‘Copa de España vehículos CM’, as part full vehicle development. dynamic response modelled using finite element application techniques structural design validated lab tests. In this way, various...

The impact of motorcyclists against the posts roadside barriers is one most frequently and harmful accidents.In order to avoid or minimize effects, different safety systems are being installed in many roads world.These should conform technical standards.European Technical Specification 1317-8 defines how it be testing procedure placement prevent such accidents.The full-scale crash test with a dummy requires certain values not exceeded neck forces, moments Head Injury Criterion (HIC).This...

This work develops a software tool to calculate and predict the energy consumption of an electric vehicle (EV) for any desired route. The is based on mathematical model vehicle, which relates with factors such as speed terrain slope. In addition, driving style, weather conditions traffic congestion can be taken into account. has been validated real data from vehicle. On other hand, this proposes methodology use EV, long its basic characteristics are known. results obtained in applied...

In sports competitions with wheeled vehicles, the resistances to movement that most affect vehicle performance are aerodynamic drag, rolling resistance, inertial forces and gravitational forces. When a powerful engine is available, resistance negligible but, in where has low-power or lack of it, significant influence on performance. The advance curve due steer angle (curve resistance) not taken into account during design process. However, as noted other research for this type vehicle, cannot...

For the accurate design of some types mechanisms, it is necessary to combine multibody dynamics computer simulations with finite element structural analysis.These mechanisms are in which body (frame) stiffness bodies have same magnitude as their elastic elements.With this mind, traditional go-kart chassis process reviewed.The approach evaluate properties its frame consists an iterative FEM techniques applied considering constant load cases.These cases defined according maximum stresses will...

Evolutionary bilevel algorithms are used for approximating the running resistance on basis of long-term fuel consumption data a diesel passenger train in different routes. The input comprises geometry these routes, speed and acceleration limits certain engine properties. A is found which consumptions predicted by model equal to logged vehicle each routes training set. has been validated with simulated known properties also diesel-hydraulic railcar operating 94 km route northern Spain. error...

At present, there is a common effort to reduce the environmental effect of energy consumption. With this objective, transportation sector seeks improve emissions in all its modes. In particular, rail transport industry analysing various alternatives for non-electrified lines. These services are mainly carried out with diesel units. As an alternative fuel, present study use liquefied natural gas (LNG) railway traction was analysed. A predictive model developed and implemented order estimate...

Analysis of the fatigue life a semitrailer structure necessitates identification loads and dynamic solicitations in structure. These forces can be introduced computer simulation software (multibody + finite element) for analysing response different design solutions to them. numerical models must validated some parameters need measured directly field test with real vehicles under various driving conditions. In this study, low-cost monitoring system is developed application fleet semitrailers....