Your Selections

Suspension systems
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Committees

Events

Magazine

new

Modelling and Simulation of Vehicle Suspension System with Variable Stiffness Using Quasi-zero Stiffness Mechanism

SAE International Journal of Vehicle Dynamics, Stability, and NVH

University of Petroleum and Energy Studies, India-Mohit Saini
  • Journal Article
  • 10-04-01-0003
Published 2019-12-02 by SAE International in United States
The dynamics and comfort of a vehicle closely depends on the stiffness of its suspension system. The suspension system of a vehicle always had to trade-off between comfort and performance of a vehicle; since for comfort a softer suspension is preferred which in turn decreases the aerodynamics and cornering performance and increases the ride height of the vehicle; whereas in stiffer suspension the ride height can be lowered, but forces due to bumps are transferred all the way up to the drivers cabin. This article aims to design a vehicle suspension model with variable stiffness using quasi-zero stiffness (QZS) mechanism and study its force-displacement characteristics and minimize the fundamental stiffness of the suspension system. The model developed uses the principle of negative stiffness to achieve low stiffness for the softer suspension system. The mechanism designed comprises of a pushrod suspension system with three parallel springs attached to one end of the rocker arm, one primary coil spring is mounted perpendicular to the rocker arm and the other two secondary plate springs are attached to the…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Design & analysis of 2 point aluminum upper control arm in modular multi link rear suspension system

ZF India Pvt Ltd.-Mayur Shamkant Kulkarni
  • Technical Paper
  • 2019-28-2564
Published 2019-11-21 by SAE International in United States
In current automobile market, due to the need of meeting future CO2 limits and emission standards, demand for hybrid systems is on the rise. In general, the requirements of modern automobile architecture demands modular chassis structure to develop vehicle variants using minimum platforms. The multi-link modular suspension system provides ideal solution to achieve these targets. To match ideal stiffness characteristics of system with minimum weight, aluminum links are proving a good alternative to conventional steel forged or stamped linkages. Design of current 2-point link (Upper Control Arm) is based on elasto-kinematic model developed using standard load cases from multi body dynamics. CAD system used is CATIA V5 to design upper control arm for rear suspension. This arm connects steering knuckle & rear sub frame. For Finite Element Analysis we used Hyperworks CAE tool to analyze design under all load cased & further optimization is done to resolve highly stressed zones. An optimized solution presented with a balance of ideal stiffness & strength. A CAD model developed with aluminum forged alloy (6082 - T6) is compared…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Countering the Destabilizing Effects of Shifted Loads through Pneumatic Suspension Design

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Virginia Tech, USA-Yang Chen, Mehdi Ahmadian
  • Journal Article
  • 10-04-01-0001
Published 2019-11-08 by SAE International in United States
This article proposes a novel approach to reduce the destabilizing impacts of the shifted loads of heavy trucks (due to improper loading or liquid slosh) by pneumatic suspension design. In this regard, the pneumatically balanced suspension with dual leveling valves is introduced, and its potential for the improvement of the body imbalance due to the shifted load is determined. The analysis is based on a multi-domain model that couples the suspension fluid dynamics, shifted-load impacts, and tractor-semitrailer dynamics. Truck dynamics is simulated using TruckSim, which is integrated with the pneumatic suspension model developed in AMESim. This yields a reasonable prediction of the effect of the suspension airflow dynamics on vehicle dynamics. Moreover, the ability of the pneumatic suspension to counteract the effects of two general shifted loads - static (rigid cargo) and dynamic (liquid) - is studied. The simulation results indicate that the dual-leveling-valve suspension results in a reduction in roll angle and roll rate of the vehicle body for both static and dynamic load-shifting cases, as compared to the conventional single-leveling-valve suspension. Suppression of…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Towability Design Criteria and Equipment Use - Passenger Cars, Vans, and Light-Duty Trucks

Motor Vehicle Council
  • Ground Vehicle Standard
  • J1142_201910
  • Current
Published 2019-10-28 by SAE International in United States
This SAE Recommended Practice describes the type of equipment commonly used with towing equipment, provides information to calculate safe steering loads, and outlines design criteria.
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Towing Equipment Ratings and Practices

Motor Vehicle Council
  • Ground Vehicle Standard
  • J2512_201910
  • Current
Published 2019-10-24 by SAE International in United States
This SAE Recommended Practice applies to all trucks that are equipped with armlift bodies, carrier bodies, wheel lift bodies, wrecker, and underlift bodies. Additional rating methods are provided for tow slings, truck hitches, and chain assemblies.
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

System Level Design of a Self-Stabilizing Two-Wheeler Suspension Concept

Chalmers University-Dhurai Prabhahar
Sastra Deemed University-Hariharan Sankarasubramanian
Published 2019-10-11 by SAE International in United States
Two-wheeler represent one of the most used mode of transport in countries like India. The data from NCRB shows that most injuries to two-wheeler motorists are after being thrown off the vehicle. A self-stabilized combined with enclosure prevents serious injury in case of a skidding of the two-wheeler. The primary objective of the work is to create a suspension system for the enclosed self-balancing two-wheeler such that it can withstand the load of the vehicle itself and the extra payload. Ride comfort was primary objective of the work.The suspension system was modeled from the first principles, solved using MATLABTM SIMULINKTM and kinematics simulation was performed to learn the behavior of the system in MSC ADAMSTM. Dynamic simulations were also carried out to check if the forces were under permissible levels for overall design. The parameters considered for the work were hard-points, suspension stiffness and damping. With manual parameter iterations, suspension parameters were tuned for optimal suspension travel, load transmission and power transmission to ground.The work presents a concept for suspension system verified for kinematics and…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Modeling and Analysis of Helical and Wave Spring Behavior for Automobile Suspension

Sri Krishna College of Engg. and Tech.-Soundararajan Ranganathan, Sathishkumar Kuppuraj, Girish Vishnu Rajaram Ganesan, Jayasuriya Nandhagopal
Published 2019-10-11 by SAE International in United States
The suspension is an indispensable element of automobiles which plays a crucial role in maintaining stability and the ride comfort. Helical springs are used in automobile suspension for many decades. The stiffness of the spring and presence of shock absorber plays a major role while negotiating a huge amount of load. Therefore, the cost of the suspension increases proportionally in commercial vehicles. In this present work, a helical and wave spring is designed and static cum dynamic analysis is done by using ANSYS 18.1 for comparing their performance and to eliminate the downside of the suspension. The geometry of the helical spring is designed using the helix curve and wave spring is designed using Sinusoidal equation. Modeling of both the springs is done using Solid works 2018. Chrome silicon and music wire are chosen as a spring material. The responses like stress and deflection of helical spring and wave spring for both the materials under static loads of 3000 N, 3500 N, 4000 N is obtained. Further, the dynamic analysis is conducted on both the…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Considerations for Suspension Modification

Motor Vehicle Council
  • Ground Vehicle Standard
  • J2492_201910
  • Current
Published 2019-10-09 by SAE International in United States
The scope of this document is limited specifically to the following types of passenger vehicles: automobiles, light trucks, and sport/utility vehicles. This document addresses modifications as they apply to legal use of the vehicle, and examines suspension modification as it applies to stock (as manufactured) ride height, and changed (raised or lowered) ride height. Note that modifications of ride height are considered, exclusive of wheel and/or tire modifications, which can also have potentially serious side effects, and are outside the scope of this document.
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Link digital suspension uses sensors, ECU to keep cabs stable

SAE Truck & Off-Highway Engineering: October 2019

Terry Costlow
  • Magazine Article
  • 19TOFHP10_07
Published 2019-10-01 by SAE International in United States

Link Manufacturing is beefing up its usage of digital technologies with an upgraded Cabmate, unveiling a cab suspension system that smooths the ride for both drivers and those in sleepers. Link's Road Optimized Innovations (ROI) system uses sensors and an electronic control unit (ECU) to stabilize the entire cab for roughly the cost of two advanced comfort seats.

Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

A Dictionary of Terms for the Dynamics and Handling of Single Track Vehicles (Motorcycles, Scooters, Mopeds, and Bicycles)

Motorcycle Technical Steering Committee
  • Ground Vehicle Standard
  • J1451_201909
  • Current
Published 2019-09-24 by SAE International in United States
Terminology within this document is limited to the dynamics and handling characteristics of single track, two-wheeled vehicles.
This content contains downloadable datasets
Annotation ability available