Structural Analysis of Double-Wishbone Suspension System

A suspension system is a crucial part of the vehicle system which assists in handling the vehicle and safety of the occupants. From leaf spring type suspension to multi-link suspension and modern adaptive suspension systems, different modifications and researches are practiced to enhance dynamic characteristics of suspension optimizing drivability and ride comfort. The presented study focuses on the analysis of double wishbone suspension system. The components used and working of this suspension are also explained as well as the numerical calculation for creation of the spring is presented. The Finite Element Analysis (FEA) is carried out using Simscale software. The suspension is analyzed through static analysis and results show acceptable values. Keywords: Structural Analysis, Vehicle Suspension System, Double Wishbone Suspension System, Analysis of Suspension System, Finite Element Analysis (FEA), SIMSCALE, Suspension Spring, Suspension Spring Calculation.

The Design, Simulation and Fabrication of an Omnidirectional Inertial Switch with Rectangular Suspension Spring

An omnidirectional inertial switch with rectangular spring is proposed in this paper, and the prototype has been fabricated by surface micromachining technology. To evaluate the threshold consistency and stability of omnidirectional inertia switch, the stiffness of rectangular suspension springs is analyzed. The simulation result shows that the coupling stiffness of the rectangular spring suspension system in the non-sensitive direction is a little more than that in the sensitive direction, which indicated that the omnidirectional switching system’s stability is reinforced, attributed to the design of rectangular springs. The dynamic response simulation shows that the threshold of the omnidirectional inertial switch using the rectangular suspension spring has high consistency in the horizontal direction. The prototype of an inertial switch is fabricated and tested successfully. The testing results indicate even threshold distribution in the horizontal direction. The threshold acceleration of the designed inertial switch is about 58 g in the X direction and 37 g in the Z direction; the contact time is about 18 μs.

Random analysis of coupled vehicle-bridge systems with local nonlinearity based on explicit time-domain method

Based on the explicit time-domain method in conjunction with the equivalent linearization technique, an efficient analysis algorithm is developed for the random vibration analysis of the coupled vehicle-bridge system with local nonlinear components under the random irregular excitation from a bridge deck. With the coupled vehicle-bridge system divided into two subsystems, the equivalent linearized subsystem for the vehicle subsystem with the hysteretic suspension spring is constructed for the given time instant using the equivalent linearization technique. Then the dimension-reduction vibration analysis for the equivalent linearized coupled vehicle-bridge system can be carried out based on the time-domain explicit method, which has been proven to be highly efficient. The numerical example indicates that the proposed approach is of feasibility.

Vibration Isolation

This chapter discusses vibration isolation of STM and AFM. First, the basic concepts of vibration isolation are illustrated by a one-dimensional system using elementary mechanics. The source of vibration, the environmental vibration, its characteristics, and methods of measurement are presented. The importance of vibration isolation at the laboratory foundation level and the proper mechanical design of STM and AFM are then discussed. The focus of this chapter in on the most important vibration isolation system: two-stage suspension spring with eddy-current damping. A detailed analysis of the two-stage spring system as well as aspects of practical design is presented. The principles and design charts for eddy-current damping system are discussed. Finally, the commercial pneumatic vibration isolation system is briefly discussed.

Experimental investigation of fatigue failure in an ASTM A401 compression spring of a passenger car

This work outlines the fatigue failure in a failed helical coiled compression spring of a passenger car used as a commercial vehicle. As a failure investigation case study, the fractured left rear axle suspension spring of the car is thoroughly examined. The fractographic investigations included the visual examination, spectroscopy, microstructure analysis, SEM and micro-hardness testing. The foremost causes of failure have been identified. From the SEM fractograph, microvoid coalescence is observed at the grain boundaries on of the fractured surface which eventually resulted in intergranular dimple rupture. Residual stress is also measured on the fractured surface through two-dimensional (2-D) imaging using a Debye Scherrer ring, with the conclusion that the spring under investigation experiences micro-stress due to the variation of theintergranular spacing resulting from the vibrations induced by overloading, road conditions and prolonged use which eventually results in a rupturing of the compression spring.

Analysis of the Mechanisms for Compensation in Clock B

This chapter assesses the design requirements of the grasshopper escapement, the pendulum and suspension spring to provide compensation for changing density and viscosity of the air surrounding the pendulum and changing escapement torque. It assesses the key components of the Harrison system: a pendulum bob of modest mass; a pendulum operating at a large running arc; and the grasshopper escapement’s increased torque delivery, ability to run without lubrication, its composers that allow fine adjustment to the torques delivered before and after the escaping arcs are reached and the importance of the thickness of the suspension spring that runs within circular cheeks. It also compares the system to the traditional pendulum clock design that traditionally employs a pendulum with a large mass and high-quality factor—high Q. Furthermore, it discusses Harrison’s stipulation that the pendulum needed to slightly reduce its length when warm.

Design And Analysis Of Two Wheeler Suspension Spring

In modern trends of the automobile industry, the ride comfort for drivers is the safety and suspension performance of a vehicle. In vehicles, vibration is one-factor causing damages to the base of the vehicle, wear and tear, etc. Vibration control is a major factor to satisfy customers. In this study, the suspension system in the vehicle is the main component to control the vibration. From the concept of suspension system in a vehicle, there are different approaches in the suspension system such as to modified design in suspension, the alternate system instead of the conventional method, Material changing, etc. In this work from suspension system, spring is playing an important component which withstands the load and cause for vibration. Analytical work is carried out with changing the material properties of the spring resulted that vibration has reduced in composite material. The existing material in suspension spring is steel alloy which withstands vibration to a certain limit beyond that it gets failed and breaks. To overcome such a problem in this work we propose new material based on MMC (Carbon Steel 50%, Copper 25%, and Magnesium 25%). By validating the analytical result in structurally by deformation, equivalent stress, and dynamically observed vibration, etc. Finally, the Comparative analysis has derived and concluded for the feasible material in spring manufacturing. Modeling work is done with SOLIDWORKS Software and analysis is carried out with ANSYS software which is best for FEM.