A Methodological Study to Analyze and Design the Car Chassis

The car's chassis is also called a structure that locates and mounts all the vehicle's components. It also creates a secure environment for the occupants. The chassis will provide torsional and flexural rigidity to the vehicle that makes the chassis one of the most crucial elements of the vehicle. Therefore, the front impact, rear impact, side impact, front torsional, rear torsional, vertical bending, lateral bending analyses were performed. The contribution of chassis is not limited to supporting the vehicle’s component, but it extends to providing better performance and aesthetics. Therefore, the design of the car chassis must be done accordingly. The current paper deals with the study of the design and analysis of the race car. The deformation, stress, and Factor of safety were considered as the evaluation parameters which were obtained by Finite Element Analysis (FEA) in Ansys software. To design the chassis, the SolidWorks software was utilized. Keywords: Car Chassis, Design, FEA, Material Comparison.

Multidisciplinary Lightweight Optimization for Front Impact Structure of Body Frame Based on Active and Passive Safety

The Analytic Target Cascading (ATC) is an effective method for solving hierarchical Multidisciplinary Design Optimization (MDO) problems. At the same time, this method suffers from poor convergence and low accuracy, which is caused by the inconsistency of system constraints. In this paper, a novel ATC method based on dynamic relaxation factor is proposed. The dynamic relaxation factor of consistency constraint is added in the system level and is adjusted by the deviation of the linking variables between the levels to ensure the feasible region of the design space. The effectiveness and accuracy of this method are verified by a mathematical example. This method is used to solve the lightweight problem of the trussed front part of the vehicle body frame based on active and passive safety to achieve the collaborative optimization of lightweight trussed frame, crash safety, and aerodynamic characteristics. The important value of the novel ATC method based on dynamic relaxation factor in engineering applications is proven.

Brain Injury Caused by Rifle Bullet Impacting Bulletproof Plate: Experiment and Simulation

Background: In wars, when bullets impact the bullet-proof helmet, kinetic energy will be transferred from the skull to brain tissue, resulting in the rapid deformation, stretching, shearing and final destruction of the soft tissue. In recent years, with the continuous upgrading of protective equipment, the penetration ability of bullets into protective equipment has gradually decreased, but the problem of head injuries caused by deformation of the back of the helmet has become increasingly prominent. It is of great significance and value to study the brain trauma caused by the bullet impact of the bullet-proof helmet.Methods: First proceeded the rifle bullet impact physical brain model experiment and the results were used to verify the simulation process of high-speed bullet impact, simulated the bullet hitting brain model from different directions (front, side, rear) and different incident angles (0°, 15°, 30°), then evaluated the craniocerebral injury by analyzing skull stress, intracranial pressure, principal strain, and shear strain.Results: When impact from the rear, the peak intracranial pressure and skull stress increase by 20%-25% compared to the front impact, and the principal strain and shear strain are 1.5-2.2 times than that of the front impact. In the same impact direction, the severity of brain injury will increase with the increase of incident angle. When the incident angle increases from 0° to 15°, the intracranial pressure and skull stress both increase, the principal strain and shear stress increase sharply with 6-7 times.Conclusions: Under different shock conditions, the dynamic response of the brain is sensitive, and the impact position and angle of the bullet have important influences on the brain. It is more likely to be caused injury during rear impact, and as the incident angle increases, the severity of the injury will become more serious.

Buggy Role Cage – Analysis and Design

Design and analysis of Buggy roll cage commonly used as a recreational vehicle on off road terrains have been studied. These vehicles are usually modified from their existing design to provide performance and safety. In this research paper, an attempt has been made to design a roll cage for a buggy considering different members of the roll cage. In this context roll cage has been drawn on solid works CAD software and has been analyzed using finite analysis by applying the different boundary conditions. The roll cage has been designed considering the AISI 4130 steel and carbon fiber considering five cases such as front impact, side impact, rear impact, drop test and roll over test to ensure safety of the operator to survive the impact scenario. The main significance of this study is to analyze buggy role cage from safety point of view of operator. From these results it can be concluded that carbon fiber roll cage is also one of the promising alternatives for roll cage design and can be recommended from safety point of view.

Crash Analysis of Bus Body Structure using Finite Element Analysis

Crash analysis of non-air-conditioned sleeper bus has been carried in present work. Using relevant automotive industry standards (052 and 119) bus dimensions are considered for design. Surface modeling technique is used to prepare computer aided model. Further the bus design is freeze using finite element analysis for different crash conditions as front impact, side impact and rear impact. Crash analysis of the proposed bus design is carried using Ansys Workbench. Using the outcomes from finite element analysis as stresses, deflections, internal and kinetic energies during various crash conditions are estimated. Mesh generator is used to mesh the complex bus model. The stress and deflection magnitudes of proposed bus model are in good agreement with the experimental results available in literature. Design improvements are made using the finite element analysis outcomes, observing the deformation patterns additional pillar members of suitable length are added to increase the dynamic crush and further enhance occupant safety during collisions.

Análisis estructural de chasis prototipo para automóvil tipo SAE BAJA

In the present work, the numerical analysis of the structure of a prototype of a SAE BAJA type automobile chassis is developed. Within the proposal of the model, factors that become important when implementing it are considered, these factors are: driver safety, sufficient spaces for vehicle components, among other basic points. Likewise, the model is subjected to different tests established by the Society of Automotive Engineers (SAE), tests such as: Front impact, rear impact, side impact, overturn, landing tests for front jump and rear jump; the conditions to which these tests are subjected are extracted from articles (tests) and applied in the appropriate areas to have the most accurate and close to reality results. The analysis is carried out with different materials and profiles used for structural members, in this way the appropriate configuration of the profiles and materials is also obtained. Due to the satisfactory parameters obtained, a fairly efficient model is obtained, this has an impact on the necessary safety for the driver, basically, because the system has low deformations in the materials and withstands relatively high stresses.