Projeto e Análise de Sistema Automatizado de Suspensão de Cabine de Caminhão

Design and Analysis of Automated Truck Cab Suspension System

Design and Analysis of Automated Truck Cab Suspension System

Abstract

The suspension system is used to isolate the chassis from shock loads caused by irregularities in the road surface. This must be addressed without compromising the stability, steering or overall handling of the vehicle. The cab suspension system is placed between the chassis using bolts. Loads from the floor and chassis are supported by the suspension. Constraint equations and couples are used to connect various regions of the suspension system. Loads are applied to the spring of the suspension system. Static analysis is done to study the deflection of the leaf spring. Modal analysis is done to check natural frequencies. Harmonic analysis is also done to plot various graphs between frequency and amplitude. Results and discussions are made based on the results obtained in Ansys and conclusions are presented and scope for future work is also given.

Cab suspension

In order to be able to evaluate any passive or (semi)active suspension system, models that accurately describe the dynamic behavior of the vehicle and suspension are often desirable. For a fair comparison of various suspension concepts, they must be applied to the same vehicle model. Additionally, it is important that suspension component model variables are chosen so that the suspension systems perform optimally relative to the same objectives and constraints.

When investigating a truck cab suspension system to improve driver comfort limited by workspace constraints, the most important function of the vehicle model is to describe the cab motion caused by road irregularities and other disturbances.

In addition to the vehicle model, it is important to have representative models of suspension components available. A passive suspension system consists of passive elements such as springs (linear or non-linear) and shock absorbers, stops and possibly inerts. It may be worth evaluating the performance of some of these suspension concepts in a cabin suspension system. Semi-active suspension components can be considered essentially passive, meaning they can only store or dissipate system power, but automated suspension components can be considered essentially active, meaning they can store and dissipate system power simultaneously.

However, a relatively small amount of external energy can be used to change its characteristics. By doing this, the performance of the suspension system can be improved. These automated suspension components are typically variable rate springs and shock absorbers. Instructions on a Suspension System Component The performance of the suspension system can be improved by reducing the impact of vibrations on the cabin system that are caused by various factors, as discussed previously. So, now let's consider improving the performance of a cabin suspension system by carrying out an analysis on a leaf spring, which is an important component of a suspension system.

There are four basic leaf spring designs that are used in stock car racing.

They are:

  • The Mono-Leaf Spring
  • Multi-Leaf Springs
  • Parabolic Springs
  • Composite leaf springs

    • Folha Spring Project

    Considering various types of vehicles that have leaf springs and different loads on them, various types of composite leaf springs have been developed. In the case of multi-leaf composite leaf springs, inter-leaf spring friction plays a detrimental role in damage tolerance. It has to be studied carefully. In the present work, only a leaf spring design with constant thickness and constant width is analyzed.

    The following leaf spring cross-sections are considered for ease of fabrication.

    1. Constant thickness, constant width design

    2. Constant thickness, variable width design

    3. Variable width, variable width design.

    Design and Analysis of Automated Truck Cab Suspension System Design and Analysis of Automated Truck Cab Suspension System

    Spring Leaf Analysis

    The spring modeled in AutoCAD Inventor was imported into ANSYS in IGES format. Since the leaf spring was modeled as a solid element called SOLID187 was used to generate the model mesh. The SOLID187 element is a higher-order 3-D element with 10 nodes.

    SOLID187 has quadratic displacement behavior and is suitable for modeling irregular meshes (such as those produced from various CAD/CAM systems). The element is defined by 10 nodes with three degrees of freedom at each node: translations in the x, y and z nodal directions.

    Authors: madhav.chinna77@gmail.com

    References and download:

    Design and Analysis of Automated Truck Cab Suspension System

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