The Influence of Suspension System Design on Vertical Loads Imposed on the Track

Joint Rail ◽  
2003 ◽  
Author(s):  
Philip M. Strong
Keyword(s):  
System Design ◽  
Dynamic Model ◽  
Vehicle Dynamics ◽  
Short Wavelength ◽  
Suspension System ◽  
Relative Importance ◽  
Relative Significance ◽  
Dynamic Component

The relative significance of vehicle dynamics on the dynamic component of wheel-rail interface vertical forces caused by relatively short wavelength track perturbations is estimated, based on a simple dynamic model, for a range of suspension design types. The results indicate the relative importance of suspension design on track damage. This study is analytical. However, it provides a basis for testing to ensure that the influence of suspension design on track-induced vertical loads is better documented and understood.

Vehicle Dynamics Simulation and Suspension System Design

1997 ◽  
Author(s):  
T. G. Chondros ◽  
P. A. Belokas ◽  
K. Vamvakeros ◽  
A. D. Dimarogonas
Keyword(s):  
System Design ◽  
Vehicle Dynamics ◽  
Suspension System ◽  
Dynamics Simulation

Compliant dynamics of a rectilinear rear-independent system

2016 ◽  
Vol 231 (5) ◽  
pp. 785-806
Author(s):  
Xiang Liu ◽  
Jing-Shan Zhao ◽  
Zhi-Jing Feng
Keyword(s):  
Dynamic Model ◽  
Vehicle Dynamics ◽  
Ride Comfort ◽  
Suspension System ◽  
Good Effect ◽  
Redundant Constraints ◽  
The Road ◽  
Wheel Alignment ◽  
First Time ◽  
Apparent Influence

The rectilinear rear-independent suspension investigated in this paper could remain the wheel alignment parameters invariable in theory. However, its dynamics is much more complex than that of the existing suspensions because of its redundant constraints in structure. Considering the elasticity of the rectilinear rear-independent suspension, a rigid-flexible half-car dynamic model is established for the first time based on the discrete time transfer matrix method. At the same time, a rigid half-car dynamic model is established as a comparison. The natural frequency characteristics and dynamic response of the rectilinear rear-independent suspension under random road excitations are analyzed and compared with those of rigid half-car dynamic model. The results reveal that the suspension system has apparent influence to the dynamics of vehicle. The wheel alignment parameters will fluctuate within a narrow range which is mainly determined by the rolling vibration of vehicle. And the suspension system could reduce and filter the road excitations with high frequency and small amplitude. This provides a good effect on the ride comfort of vehicle. Dynamics analysis of the rectilinear rear independent suspension reveals that the proposed modeling approach could deal with the dynamics of rigid-flexible multibody systems with redundant constraints effectively.

Dynamic model of an air spring and integration into a vehicle dynamics model

2008 ◽  
Vol 222 (10) ◽  
pp. 1813-1825 ◽  
Author(s):  
F Chang ◽  
Z-H Lu
Keyword(s):  
Dynamic Model ◽  
Vehicle Dynamics ◽  
Simulation Method ◽  
Heat Transfer Process ◽  
Spring Model ◽  
Dynamics Model ◽  
Air Spring ◽  
Full Vehicle ◽  
Body Dynamics ◽  
Multi Body

It is worthwhile to design a more accurate dynamic model for air springs, to investigate the dynamic behaviour of an air spring suspension, and to analyse and guide the design of vehicles with air spring suspensions. In this study, a dynamic model of air spring was established, considering the heat transfer process of the air springs. Two different types of air spring were tested, and the experimental results verified the effectiveness of the air spring model compared with the traditional model. The key factors affecting the computation accuracy were studied and checked by comparing the results of the experiments and simulations. The new dynamic model of the air spring was integrated into the full-vehicle multi-body dynamics model, in order to investigate the air suspension behaviour and vehicle dynamics characteristics. The co-simulation method using ADAMS and MATLAB/Simulink was applied to integration of the air spring model with the full-vehicle multi-body dynamics model.

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

2018 ◽  
Vol 224 ◽  
pp. 02039 ◽  
Author(s):  
Kirill B. Evseev ◽  
Aleksander B. Kartashov ◽  
Idris Z. Dashtiev ◽  
Aleksey V. Pozdeev
Keyword(s):  
Composite Materials ◽  
Vehicle Dynamics ◽  
Viscoelastic Properties ◽  
Main Part ◽  
Suspension System ◽  
Spring Element ◽  
Reinforced Composite ◽  
Vibration Properties ◽  
Negative Effect ◽  
Spring Type

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.

Online aircraft velocity and normal acceleration planning for rough terrain following

2017 ◽  
Vol 121 (1244) ◽  
pp. 1561-1577
Author(s):  
Omid Kazemifar ◽  
Ali-Reza Babaei ◽  
Mahdi Mortazavi
Keyword(s):  
Dynamic Model ◽  
Vehicle Dynamics ◽  
Online Algorithm ◽  
Flight Path ◽  
Rough Terrain ◽  
Mountainous Areas ◽  
Level Flight ◽  
Terrain Following ◽  
Workload Reduction ◽  
Normal Acceleration

ABSTRACTThis paper attempts to develop an efficient online algorithm for terrain following in completely unknown rough terrain environments while incorporating aircraft dynamics in the guidance strategy. Unlike most existing works, the proposed algorithm does not generate the flight path directly. The algorithm employs acquired information from the vehicle onboard sensors and rapidly issues appropriate Guidance Commands (GCs) at every point along the way. A suitable dynamic model is developed which takes the lags in the vehicle dynamics into account. The flight path forms gradually as a result of applying the GCs to the vehicle dynamics. Terrain-conforming capability afforded by this approach allows for autonomous and safe low-level flight in unknown mountainous areas. It considerably enhances the autonomy level of the vehicle and in the case of manned aircraft could significantly lead to pilot workload reduction. The proposed scheme is proven to be promising for online applications.

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