On the achievable performance using variable geometry active secondary suspension systems in commercial vehicles

2011 ◽  
Vol 49 (10) ◽  
pp. 1553-1573 ◽  
Author(s):  
Willem-Jan Evers ◽  
Igo Besselink ◽  
Arjan Teerhuis ◽  
Henk Nijmeijer
Keyword(s):  
Variable Geometry ◽  
Commercial Vehicles ◽  
Suspension Systems ◽  
Secondary Suspension

scholarly journals Hybrid Secondary Suspension Systems

2009 ◽  
Vol 16 (5) ◽  
pp. 467-480 ◽  
Author(s):  
Nader Vahdati ◽  
Mehdi Ahmadian
Keyword(s):  
Mathematical Model ◽  
Vibration Absorbers ◽  
Simple Mathematical Model ◽  
System Behavior ◽  
Engine Mounts ◽  
Suspension Systems ◽  
Tuned Vibration Absorbers ◽  
Simulation Results ◽  
Secondary Suspension ◽  
The Mathematical Model

Passive fluid mounts are used in the fixed wing applications as engine mounts. The passive fluid mount is placed in between the engine and the fuselage to reduce the cabin's structure- borne noise and vibration generated by the engine.To investigate the benefits of passive fluid mounts used in conjunction with tuned vibration absorbers (TVA), a simple mathematical model is developed. This mathematical model includes the mathematical model of a passive fluid mount, a TVA, and a spring representing the fuselage structure. The simulation results indicate that when passive fluid mounts are used in conjunction with TVAs, an active suspension system behavior is nearly created.

A novel tripped rollover prevention system for commercial trucks with air suspensions at low speeds

2017 ◽  
Vol 232 (11) ◽  
pp. 1516-1527 ◽  
Author(s):  
Haitao Ding ◽  
Amir Khajepour ◽  
Yanjun Huang
Keyword(s):  
Road Safety ◽  
Commercial Vehicles ◽  
Dynamics Model ◽  
Air Spring ◽  
Severe Injuries ◽  
Low Speed ◽  
Suspension Systems ◽  
Rollover Prevention ◽  
Air Suspension ◽  
Prevention System

This paper presents a novel system to avoid tripped rollovers at low-speed operations for commercial vehicles with air suspension systems. This is of particular significance since truck rollovers have become a serious road safety problem, which usually lead to severe injuries and fatalities. Several active anti-rollover systems have been proposed in the past two decades; however, most of them focus on untripped rollover prevention instead of the tripped rollovers. Up to now, very few pieces of literature discuss the approaches that are used to avoid tripped rollovers of trucks. Furthermore, the air suspension is widely used for commercial vehicles, thus it provides an opportunity to prevent rollovers when properly manipulated. Therefore, a novel tripped rollover prevention system is proposed for trucks at low-speed operations with air suspensions. A roll dynamics model with an air spring is built to investigate the dynamic behavior and the time response of the whole system. More importantly, the feasibility of this new anti-rollover system is discussed and verified by the co-simulations in TruckSim and MATLAB/Simulink under two possible tripped rollover conditions.

Safety Analysis for High Speed Bogie Technologies of CRH3 EMU

2012 ◽  
Vol 479-481 ◽  
pp. 797-802
Author(s):  
Shu Lin Liang ◽  
Ren Luo ◽  
Ping Bo Wu
Keyword(s):  
High Speed ◽  
High Property ◽  
Air Spring ◽  
Running Safety ◽  
Suspension Systems ◽  
Safety And Reliability ◽  
Point Control ◽  
Roller Rig ◽  
Suspended Structure ◽  
Secondary Suspension

The bogie technology of the 350km/h EMU train is one of the key parts for China high speed railways. Through analysis of the high speed bogy for CRH3 EMU train, the design conceptions and methodologies of the bogy structure and suspension systems are better understood. Technical procedures for the bogie design are carefully investigated, which includes the wheel/rail interaction, helical spring and high property rubber pad used in primary suspension, high flexible and large convolution bellows type air spring, anti-roll bar and two point control of air springs used in secondary suspension, and the elastic frame suspended structure used for traction motor. Comparison between different bogy techniques are carried out by using the dynamic simulation, roller rig test and field test, and the efficient way to raise the bogie running safety and reliability is analyzed.

Preview-Based Control of Suspension Systems for Commercial Vehicles

1999 ◽  
Vol 32 (2-3) ◽  
pp. 237-247 ◽  
Author(s):  
J.H.E.A. Muijderman ◽  
J.J. Kok ◽  
R.G.M. Huisman ◽  
F.E. Veldpaus ◽  
J.G.A.M. van Heck
Keyword(s):  
Commercial Vehicles ◽  
Suspension Systems

Study of Train Derailments Caused by Damage to Suspension Systems

2015 ◽  
Vol 11 (3) ◽  
Author(s):  
S. H. Ju
Keyword(s):  
Finite Element ◽  
Nonlinear Finite Element Method ◽  
Train Derailment ◽  
Interval Time ◽  
Suspension Systems ◽  
Derailment Coefficient ◽  
Parametric Studies ◽  
Train Speed ◽  
Rail Irregularities ◽  
Secondary Suspension

A nonlinear finite element method was used to investigate the derailments of trains moving on multispan simply supported bridges due to damage to suspension systems. At the simulation beginning, the initial vertical trainloads to simulate the train gravity weight are gradually added into the mass center of each rigid body in the train model with large system damping, so the initial fake vibration is well reduced. A suspension is then set to damage within the damage interval time, while the spring and/or damper changes from no damage to a given percentage of damage. Finite element parametric studies indicate the following: (1) the derailment coefficients of the wheel axis nearby the damage location are significantly increased. (2) Damage to the spring is more critical than that to the damper for the train derailment effect. (3) The derailment coefficient induced by damage to the primary suspension is more serious than that to the secondary suspension. (4) If rail irregularities are neglected, the train speed has little influence on the derailment coefficients generated from damage to suspensions. (5) The train derailment coefficients rise with a decrease in the damage interval time, so sudden damages to suspension systems should be avoided.

Ride Quality of High-Speed Trains Traveling Over the Corrugated Rails

2006 ◽  
Author(s):  
H. Farahpour ◽  
D. Younesian ◽  
E. Esmailzadeh
Keyword(s):  
High Speed ◽  
Ride Comfort ◽  
The Body ◽  
Ride Quality ◽  
Comfort Index ◽  
Suspension Systems ◽  
Power Spectral ◽  
High Speed Trains ◽  
Train Speed ◽  
Secondary Suspension

Ride comfort of high-speed trains is studied using Sperling's comfort index. Dynamic model is developed in the frequency domain and the power spectral density (PSD) of the body acceleration is obtained for four classes of tracks. The obtained acceleration PSD is then filtered using Sperling's filter. The effects of the rail roughness and train speed on the comfort indicators are investigated. A parametric study is also carried out to evaluate the effects of the primary and secondary suspension systems on the comfort indicators.

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