Influence of Suspension Component Deterioration on Vehicle Handling (original) (raw)
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Influence of deteriorated suspension components on ABS braking
Vehicle System Dynamics, 2008
Vehicle ride control depends not only on vehicle design, but also on the condition of the vehicle components and suspension components in particular. Moreover the current vehicles are equipped with many kinds of electronic devices assisting driver in his daily and emergency situations. The devices focused on the active safety should increase the vehicle handling capabilities, e.g. by a targeted intervention of the brakes on the individual wheels. These systems require the correctly functioning wheel suspension. However, the used vehicles do not guarantee the correctly functioning wheel suspension. The worn dampers have less damping capabilities and the worn bushings results in an improper wheel alignment. This paper presents a simulation study of the influence of worn suspension components such as dampers and shocks on the braking capabilities of the vehicle. Stopping distance of vehicles as well as lateral shift is compared for different levels of worn and defective suspension components.
The influence of the vehicle’s suspension malfunction on its operational efficiency
Ukrainian Journal of Mechanical Engineering and Materials Science, 2018
The main malfunctions that arise when operating a vehicle in Ukraine are the failure of the suspension elements and vehicle tires due to the poor condition of the most roads [11]. The car suspension elements soften the dynamic loads and smooth out the oscillations from the unevenness on the road while riding and provide a good stability and smoothness of the car ride. The car suspension affects not only the handling, stability, stability of the car motion, but also provides comfort and safety of the car, especially, when car is driven on uneven surface of the road and in sharp manoeuvres of the movement. The suspension of the car is a connecting linkage between the wheels and the body of the vehicle through which the forces of the shocks from wheel act on the vehicle body while riding over bumps on the road. Also, especially the front suspension of the car smooths the oscillations from the uneven road and provides the smooth ride. The smoothness of the ride depends on the elasticity of the suspension and car tires, work of shock absorbers and distribution of the vehicle mass. Besides, the smoothness of the ride on the uneven road has the influence on the comfort of the driver and passengers, the average speed of movement (as a consequence it causes the changes in fuel consumption, productivity and cost of transportation), the cargos safety, the reliability of the car. The car suspension is one of the least reliable and durable elements of the car. The work of the faulty suspension reduces the durability of the car in 1.5 times and worsens its steering, thereby reducing its safety [11]. Ultimately, the motion of a car with a faulty suspension can cause an emergency on the road due to possible unpredictable suspension behavior. The analyzing of the typical malfunctions of the car suspension components and its influence on smoothness and safety of motion is provided in the article. The methods of experimental research of the influence of the typical suspension malfunctions on the parameters of the car motion have been developed. The choice of research tools and the mounting place of the sensors on a car suspension is substantiated. On the basis of the experimental research results, the analysis of the influence of the suspension malfunction on the car's condition was performed according to the voltage changing of the sensor-analyzer, and the voltage change was transformed into the linear displacement of the suspension elements. With the use of the MATLAB program in Simulink mode the simulation of the car ride over the typical obstacles with the use of a two-mass structure for sprung and unsprung masses was carried out, the oscillations of the unsprung and sprung masses were obtained in relation to the road with given pressure in the tire and given speed when riding over various types of obstacles with the normal and faulty shock absorbers.
In simple terms, a rubber-to-metal component is a vulcanized rubber block bonded to metal (or plastic), used to join components or structures that must be isolated from noise and vibration. In practice, reaching an effective compromise between durability, safety and comfort when designing each RTM component to suit a specific vehicle model and purpose involves many complex considerations. This leads to unique rubber/additive recipes and product designs to tune dynamic properties while also meeting requirements such as high fatigue strength, resistance to ageing, temperature resistance and recyclability. In addition, vehicle safety systems such as anti-lock braking and traction control can only function perfectly if all suspension components are in faultless condition. Wear in the strut mounts May leads to increased vibration, longer braking distances, or stiff/non-self-centering steering, symptoms that usually develop gradually and go unnoticed by the vehicle owner until a knocking noise prompts investigation [10]. Where possible without dismantling, visual inspection may reveal folds or cracks in the surface of the rubber (see pic, below) or the rubber detaching from the metal. They also create higher loads on new shock absorbers and other suspension components such as drop links, which then wear more rapidly. Therefore motivation for this research is to increase fatigue life of rubber isolator so that there is increase in the life of strut mount of Honda CRV SUV (model no: EX-L 4WD).
The Archives of Automotive Engineering – Archiwum Motoryzacji
The article presents a study of the influence of vehicle’s conditions of use, such as road class, vehicle speed or its load, on its vertical dynamic responses. In the article only the kinematic excitations were analysed, as these are more common than the dynamic ones. The road profiles were artificially generated according to the ISO 8608 standard, which classifies roads based on power spectral density of excitations which they generate. Ride safety, ride comfort and fatigue strength indicators were computed. Ride safety was defined by the DLC – Dynamic Load Coefficient. Ride comfort was judged taking into consideration the recommendations from the ISO 2631 standard (which contains the information on vibration frequencies and their effect on human body, as well as the allowed exposure times to given vibrations) by calculating root mean square values of sprung mass accelerations for bandwidths defined in the standard. Load spectrums for the fatigue analysis were created using forces ...
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
Mechanisms and Machine Science, 2014
The objective of this research is to develop a mathematical model using a seven degree-of-freedom full car. The simulation analyses were conducted to predict the response of the vehicle when driven across speed bumps of different shapes and at range of speeds. Three bump sizes were considered in this study including bump 1 (500 mm x 50 mm), bump 2 (500 mm x 70 mm), and bump 3 (500 mm x 100 mm). These were run through the model at speeds of 8 km/hr, 16 km/hr, 24 km/hr and 32 km/hr. The model was validated using experimental data, which was collected by driving the vehicle across the bump 1 at a speed of 8km/h. The performance of the suspension in terms of ride comfort, road handling and stability of the vehicle were analysed and presented. The vibration analysis for different speed levels of 8 km/hr, 16 km/hr, 24 km/hr and 32 km/hr indicated that, the effect of vehicle speeds on the vibration of the vehicle body increases at lower speeds up to a maximum value after which it began to decrease from the optimum point with increasing vehicle speeds. The model has been used for fault detection of under-inflation of vehicle tyre by 35%, and also to predict possible future suspension faults.
Investigation of Vehicle Stability with Consideration of Suspension Performance
Applied Sciences, 2021
The issue of movement stability remains highly relevant considering increasing vehicle speeds. The evaluation of vehicle stability parameters and the modeling of specific movement modes is a complex task, as no universal evaluation criteria have been established. The main task in modeling car stability is an integrated assessment of the vehicle’s road interactions and identification of relationships. The main system affecting the vehicle’s road interaction is the suspension of the vehicle. Vehicle suspension is required to provide constant wheel to road surface contact, thus creating the preconditions for stability of vehicle movement. At the same time, it must provide the maximum possible body insulation against the effect of unevennesses on the road surface. Combining the two marginal prerequisites is challenging, and the issue has not been definitively solved to this day. Inaccurate alignment of the suspension and damping characteristics of the vehicle suspension impairs the stab...
Modelling and simulation of motor vehicle suspension system
IOP Conference Series: Materials Science and Engineering, 2021
In this work, using a quarter-car model was adopted, the equations of motion were derived for a passive and then the sky-hook semi-active suspension systems. The derived differential equations, solved using the Dormand-Prince pair numerical formula, was then used to simulate values of displacements as affected by damping coefficients and the sky-hook constant. The simulated results showed that the maximum amplitude of the sprung mass, which is linked to ride discomfort, increases while those of unsprung masses, which affects the road holding ability, decreases with increasing depth of pothole. Furthermore, displacements for both sprung and unsprung masses varied directly with damping coefficient. Finally, as the sky-hook constant of the semi active system model increases, values of amplitudes of unsprung masses decreases while those of sprung masses increases. It was, thus, shown that the vertical displacements of vehicle bodies and wheels are dependent on the depth of potholes, dam...
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.