Part Of Suspension System Research Articles

REDUCTION OF M8 LEAKAGES IN FRONT FORKASSEMBLY CELL

Front fork is one of the part of suspension system. Front fork serves as rigidity component just like a frame in two and three wheeler vehicle. As it is an important part of the suspension system but the manufacturers of front fork assembly is facing the leakage problem. The purpose of the study is to detect and reduce M8 leakages in front fork assembly and to reduce the rejection rate due to leakages. In this study also the analysis of different materials when used for manufacturing of oil seal has been carried and also the theoretical as well analytical analysis has been done. For analytical analysis Ansys workbench ver.2022 has been used. There are various parameters responsible for M8 leakages in front fork assembly, few parameters like pressure and torque contributes to more rejection rate. So, these parameters are considered for study. This study and analysis of the parameters, will not only help to increase the profit of the company but also help to improve the quality of front forks assembly.

A Technological Review of Magnetorheological Dampers

Damper is part of suspension system where it is function to prevent noise, bumps, and vibrations. Most dampers are categorized in three categories which is active, semi-active and passive damper. Magnetorheological (MR) damper is categorized under semi-active damper. This type of damper utilize rheological fluids which is in normal state its free-flowing liquid but when magnetic field or current is applied, the fluid will change its viscosity. This paper review 8 MR damper which are hybrid with eddy current, multi-coil, rotary high torque, orifice hole, permanent magnet, serial-type with flow channel, extra grooves around the housing, and high speed adaptability. The research and development still on going to find the best means as possible to utilize rheological fluids in MR damper. This review is very important to the new researcher in order to find new way to further improve MR damper.

SOME STUDY ON FATIGUE LIFE OF OPEN COIL SUSPENSION SPRINGS

A helical compression spring being an important part of the vehicle suspension system absorbs energy and shocks that are received by the wheel from road irregularities. Helical compression spring in a suspension system supports the loading effect on the system. It is subjected to different influences of stress and fatigue. The four springs; one at each wheel of vehicle, are subjected to road conditions and driving movements. it is necessity to check the stress, factor of safety and fatigue strength of spring and other parts of the suspension system. The fatigue life of the helical compression spring is significantly affected by physical and chemical properties of the materials that make each component of the vehicle suspension system. The main purpose of this work is focus on the fatigue life of spring used in light vehicle suspension spring with different materials. Results obtained using analytical procedures are compared with those obtained using FEA. From estimation of fatigue life of Chrome Vanadium, Chrome Silicon and Hard Drawn alloy steel spring FEA approach gives fatigue life are 9x 106, 5.0108x107 and 1.484x103 cycles respectively.

Automotive leaf spring design and manufacturing process improvement using failure mode and effects analysis (FMEA)

Nowadays human safety and comfort are the most considerable parameters in designing and manufacturing of a vehicle, that is why every organization ensures the quality and reliability of components used in the vehicle. Leaf spring is also a component of vehicle which plays an important role in human safety and comfort. It acts as a structural member and an integral part of suspension system. It is important to eliminate the failures in designing and manufacturing process of leaf springs because of its importance in functionality and safety of vehicle. In this research, failure mode and effects analysis has been used to analyze and reduce the risks of 42 possible failures that can occur in automotive leaf spring. It starts from determining, classifying, and analyzing all potential failures and then rating them with the help numeric scores. The four numeric scores namely severity, occurrence, detection, and Risk Priority Number (RPN) are used to find the high potential failures of semi-elliptical leaf springs. In the end, actions are recommended for RPN greater than 250, to increase quality and reliably of product.

Non-linear control of vehicle's rollover using sliding mode controller for new 8 degrees of freedom suspension model

Stability control system is a part of active safety systems in vehicles, which is designed to control the vehicles' dynamic motion in emergency manoeuvres. In present study, modelling and simulation of a 4 degrees of freedom (4DOFs) passive suspension system initially is considered and then in order to improve the efficiency of controlling system, a new suspension system with 8DOFs by adding masses to sprung and unsprung parts of suspension system and using hybrid semi-active damper is designed. To investigate the effect of DOF on the controller performance, sliding mode controller (SMC) for models with 8DOFs are designed in MATLAB and controller performances are studied. Also, numerical results from a typical vehicle that is simulated in CarSim are the input for MATLAB simulation. Investigations show that increasing degrees of freedom accompany with applying hybrid semi-active damper lead to better stability and good handling characteristics of vehicle.

Analysis and Optimization of Lower Control Arm

Control arm in automotive vehicle acts as a linkage between sprung and unsprung mass of vehicle. Lower control arm is subjected to various loads. Due to this type of loading, there are chances of bending of control arm. Hence failure of lower control arm occurs. Weight reduction of vehicle component is one of the main concerns. The aim of the paper is to analyze and optimize the lower arm using finite element analysis. The model of lower control arm is done in CAD software. Static analysis of lower control arm is carried out in analysis software. Topology optimization of lower arm is performed for weight reduction. After topology optimization static analysis of optimized lower control arm is carried out. Results obtained from analysis where studied to check whether the design is within the yield strength. Cost analysis of existing and optimized lower control arm has been carried out to know the cost effectiveness. The purpose of automobile suspension system is passenger comfort and vehicle control. The lower control is one of the important parts of suspension system.

Analysis viscoelastic properties of fiber-reinforced composite spring for the all-terrain vehicle

For today’s composite materials have many advantages over steel materials. The composite materials take the main part in modern automobile constructions. Suspension system is the main automobile part. Components of suspension system are made of metal. Therefor suspension system have a high weight that have a negative effect for all of vehicle especially for vehicle dynamics and stability properties. The main part of suspension system is a spring element. Coil springs are the most widely used spring type for independent wheel suspension for trucks and passengers vehicles. Using composite springs can less vehicle weight especially less unspring masses. It is one of the main features of composite materials. Another feature is viscoelastic properties and hysteresis effect. That can be give excellent noise and vibration properties for vehicles.

Design and Analysis of Shock Absorber: A Review

The vehicle suspension system connects a vehicle to its wheels and contributes to the vehicle's road handling and braking for better safety and driving pleasure, and offering a comfortable ride well isolated from road noise, bumps, vibrations etc. Many people have own vehicles but they don’t know the importance of shock absorber and how to maintain it. So, it becomes important that the shock absorbers are efficient, durable and cost efficient. Material used for the helical coil spring is of great importance as it is one of the main part of suspension system. Various research papers arebased on analysis done using different materials. Many papers were published regarding “Analysis and Design of Shock Absorbers”. This paper is a review of previous literatures that cover the topic of design and analysis of shock absorbers. Observations and recommendations are shared according to the research gaps in the literature.

허브스페이스의 구조적 안전성 해석에 대한 연구

Abstract : This study investigates the analysis result of structure and fatigue due to the models of the hub space with bolt joint at wheel and the existence or nonexistence of hub ring as the part of suspension system of vehicle. As the static analysis result, the structural vulnerability can be found at hub bolt and the center of wheel at three models. Model 2 and 3 have nearly same deformation and model 1 can be endured at the least load among three models. As the fatigue analysis result, fatigue lives of three models are same at the severest load of SAE bracket history. As many screw threads of weak bolts are jointed in case of model 1, model 1 is shown to be the weakest at fatigue damage among three models. By the result of this study, model 1 with bolt joint becomes most weakest among three models. As model 2 with no hub ring and model 3 with hub ring have the nearly same states of analysis results, hub ring is shown to have no influence on the safety of automotive driving. Key words

Controllable Vibration Damper Using Magnetorheological Fluid.

Magnetorheological (MR) fluid is a functional material that responds to an applied magnetic field with a change in rheological behavior. The essential characteristic of this fluid is its ability to reversibly change from free-flowing, linear viscous liquid to semi-solid, which has controllable yield strength in milliseconds when exposed to a magnetic field. The MR fluid can, therefore, play an important role in the controllable vibration damper. In this paper, based on the experimental data, an improved mechanical model for MR damper is developed and confirmed by one degree of freedom vibration system. The model consists of a hysteresis part and a variable viscous damper proportional to the added voltage. In addition, numerical simulation are performed when the MR damper is used in the ground vehicles as a part of suspension system, while the MR damper is considered in two-stage state and on-off state. The results show that, as a controllable damper, MR damper is very effective for vibration isolation of the vehicle body acceleration and suspension travel, both in on-off state and two-stage state.