DESIGN AND EVALUATION OF A RIDE COMFORT BASED SUSPENSION SYSTEM USING AN OPTIMAL STIFFNESS-DETERMINATION METHOD

2016 ◽  
Vol 40 (5) ◽  
pp. 773-785 ◽  
Author(s):  
Jing Zhao ◽  
Pak Kin Wong ◽  
Zhengchao Xie ◽  
Caiyang Wei ◽  
Rongchen Zhao
Keyword(s):  
Ride Comfort ◽  
Determination Method ◽  
Air Spring ◽  
Mathematical Relationship ◽  
Hydraulic Damper ◽  
Modeling Process ◽  
Promising Solution ◽  
Overall Performance ◽  
Optimal Stiffness ◽  
Gas Chamber

This paper focuses on a ride comfort based suspension (RCS) system using an optimal stiffness-determination method. The proposed RCS system is composed of a variable hydraulic damper with gas chamber (VHDGC) and an air spring. In this work, the detailed structure, modeling process and parameter sensitivity of the proposed VHDGC are presented. Moreover, the mathematical relationship between the proposed damper and the air spring is considered. Numerical results reveal that the ride comfort of the proposed RCS system can be greatly improved as compared with the passive suspension. In addition, the overall performance of the RCS system is also guaranteed. In sum, the proposed RCS system is a promising solution in improving the ride comfort of the vehicle.

scholarly journals Detection and alleviation of the abnormal vibration of the monorail based on experiment and simulation

2019 ◽  
Vol 38 (2) ◽  
pp. 282-295 ◽  
Author(s):  
Yongzhi Jiang ◽  
Pingbo Wu ◽  
Jing Zeng ◽  
Lai Wei ◽  
Kaikai Lv ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Ride Comfort ◽  
Detection Method ◽  
Dominant Frequency ◽  
Experimental Results ◽  
Indirect Detection ◽  
Prominent Feature ◽  
Air Spring ◽  
Vertical Stiffness ◽  
Vehicle Acceleration

Wheel out of round, which has a significant influence on the ride comfort of vehicles, is very difficult to detect, especially for vehicles with rubber tires like a monorail. The prominent feature of wheel eccentricity caused by wheel out of round is that there will be a dominant frequency of the vehicle acceleration that varies with the speed of the vehicle, while the wavelengthes are all equal to the wheel circumference. By studying the experimental results of Chongqing straddle monorail, an indirect detection method of the wheel out of round is put forward. Then a simulation model of the monorail vehicle under the influence of the wheel out of round is established. The numerical analysis and experimental results lead to that the main reason for the abnormal vibration of the vehicle is the wheel out of round. Through the analysis of the vertical dynamic equation of the monorail system, all other factors that may affect the dominant frequency of vehicle vibration are analyzed. Finally, it is concluded this abnormal vibration caused by wheel out of round can only be reduced by increasing the vertical stiffness of the air spring and car body mass other than changing wheels.

Improvement of both handling stability and ride comfort of a vehicle via coupled hydraulically interconnected suspension and electronic controlled air spring

2019 ◽  
Vol 234 (2-3) ◽  
pp. 552-571
Author(s):  
Hengmin Qi ◽  
Yuanchang Chen ◽  
Nong Zhang ◽  
Bangji Zhang ◽  
Dong Wang ◽  
...  
Keyword(s):  
High Performance ◽  
Ride Comfort ◽  
Fuzzy Controller ◽  
Air Spring ◽  
Heavy Load ◽  
Air Chamber ◽  
Analytical Work ◽  
Suspension Model ◽  
Multi Body ◽  
High Center

The trade-off between handling stability and ride comfort is a disadvantage for the bus fitted with passive suspension due to its high center of gravity and heavy load. A novel suspension configuration with both hydraulically interconnected suspension and electronic controlled air spring is created to handle this conflicting requirement. The proposed whole vehicle system model has three subsystems: a 9-degree-of-freedom vehicle multi-body model, hydraulically interconnected suspension model, and electronic controlled air spring. The electronic controlled air spring comprises an air spring and an auxiliary air chamber, and its height can be adjusted by a fuzzy controller. Then, analytical work is performed to evaluate the handling stability and ride comfort of the vehicle with different suspension configurations under various maneuvers and suspension height modes. Finally, the vehicle on-road test is conducted to experimentally validate the proposed models. Both analytical and experimental results indicate that the vehicle fitted with hydraulically interconnected suspension and electronic controlled air spring can obtain high performance for both handling stability and ride comfort.

Analysis and Optimization of Ride Comfort for Semi-Active Suspension Based on Variable Damping

2014 ◽  
Vol 1055 ◽  
pp. 175-181
Author(s):  
Shao Bo Zhang ◽  
Mei Li ◽  
Yan Xia Liu
Keyword(s):  
Ride Comfort ◽  
Influencing Factor ◽  
Dynamical Analysis ◽  
Force Model ◽  
Air Spring ◽  
Evaluation Indexes ◽  
Car Model ◽  
Before And After ◽  
Variable Damping ◽  
Ride Comfort Evaluation

Based on NEWTON and dynamical analysis the half car model is built, in which air spring is a nonlinear system on the basis of force model and the shock absorber has soft and hard states. By the simulation of the model and combination with experiments, the model is proved right and the influencing factor of angle-displacement and acceleration of body can be gained. Then with the application of genetic algorithm in Matlab tools, appropriate control parameters is being set, the above-mentioned model can be optimized, results of optimizations will be compared with three ride comfort evaluation indexes before optimizations. By judging the corresponded extents of curve before and after optimizations, it shows that the parameters after optimizations can improve the ride comfort.

Getting Started Getting Students Modeling: Designing and Facilitating Open-ended Math Modeling Experiences

2019 ◽  
pp. 164-167
Author(s):  
Ben Galluzzo ◽  
Katie Kavanagh
Keyword(s):  
Real World ◽  
Mathematical Representation ◽  
Math Modeling ◽  
Mathematical Relationship ◽  
Modeling Process ◽  
Actual Creation

“Modeling” is a term that has several meanings in general, but particularly in mathematics. Here math modeling refers to the process of creating a mathematical representation of a real-world scenario to make a prediction or provide insight. There is a distinction between using a formula that arises from an application (for example, distance equals rate times time) and the actual creation of a mathematical relationship itself that can be useful in an applied setting. In this two part workshop, we demonstrate how to develop authentic math modeling challenge problems that are accessible and relevant to students. In the second part of the workshop we talk about how to facilitate math modeling so that students have an opportunity to be creative and innovative in their modeling process while having ownership over their solution.

scholarly journals Theoretical modeling of the vertical stiffness of a rolling lobe air spring

2020 ◽  
Vol 103 (3) ◽  
pp. 003685042094089
Author(s):  
Liufeng Xu
Keyword(s):  
Analytical Model ◽  
Ride Comfort ◽  
Experimental Tests ◽  
Geometric Parameters ◽  
Air Spring ◽  
Vertical Stiffness ◽  
Approximate Analytic Method ◽  
Proposed Model ◽  
Stiffness Characteristics ◽  
The Relationship

In order to study the characteristics of a rolling lobe air spring, a vertical stiffness analytical model is constructed based on thermodynamics and hydrodynamics. The merit of this vertical stiffness analytical model is that an analytical solution of geometric parameters is obtained by an approximate analytic method. Meanwhile, experimental tests are carried out to verify the accuracy of the vertical stiffness analytical model. The vertical stiffness analytical model can be used to qualitatively analyze the influence of geometric parameters on the vertical stiffness characteristics of a rolling lobe air spring. Therefore, the relationship between geometric parameters and the vertical stiffness characteristics is analyzed based on the proposed model. The conclusions show that the vertical stiffness analytical model can well predict the mechanical characteristics of a rolling lobe air spring and provide guidance for parameter design and vehicle ride comfort improvement.

Nonlinear dynamic model of air spring with a damper for vehicle ride comfort

2017 ◽  
Vol 89 (2) ◽  
pp. 1545-1568 ◽  
Author(s):  
Hengjia Zhu ◽  
James Yang ◽  
Yunqing Zhang ◽  
Xingxing Feng ◽  
Zeyu Ma
Keyword(s):  
Dynamic Model ◽  
Nonlinear Dynamic ◽  
Ride Comfort ◽  
Nonlinear Dynamic Model ◽  
Air Spring

Evaluation of Ride Comfort in a Railway Passenger Vehicle With Integrated Vehicle and Human Body Bond Graph Model

2017 ◽  
Author(s):  
Smitirupa Pradhan ◽  
Arun Kumar Samantaray ◽  
Ranjan Bhattarcharyya
Keyword(s):  
Ride Comfort ◽  
Graph Model ◽  
Bond Graph ◽  
Railway Vehicle ◽  
Domain Modeling ◽  
Passenger Vehicle ◽  
Air Spring ◽  
Energy Domain ◽  
Railway Passenger ◽  
Secondary Suspension

Ride comfort is the level of comfort sensed by the passengers when they are continuously exposed to the vibration and noise. To diminish the vibration level, air springs are used in the secondary suspension system instead of coil springs, especially in the modern railway vehicles. This article focuses on the modeling of Nishimura air spring with non-linear damper and human biodynamic (bio-mechanical) model by using multi-energy domain modeling approach, bond graph. The car body of the railway vehicle is treated as a beam and the first five modes including three flexible modes are considered in the model. We use International Organization for Standardization 2631 for evaluating ride comfort for different durations of the travel time (1 h, 2.5 h, 4 h and 8 h) on flexible and irregular tracks.

scholarly journals Study on FuzzPID control of Shared Chamber Air Suspension for ride comfort

2019 ◽  
Vol 293 ◽  
pp. 01002
Author(s):  
Mei Li ◽  
Dezhi Wang ◽  
Shaobo Zhang ◽  
Silong Tan ◽  
Yingcong Ji
Keyword(s):  
Ride Comfort ◽  
Suspension System ◽  
Vehicle Body ◽  
Air Spring ◽  
Air Suspension ◽  
Specific Performance ◽  
Result Show ◽  
New Type ◽  
Comfort Parameters ◽  
Sinusoidal Excitation

In order to study a new type of air suspension system, the quarter dynamic model of semi-active suspension system is established based on FuzzPID control theory; At the same time, a test bench is established. Through analyzing the data which got in simulation and test, the result show that the performance of air spring parameters has obvious improvement on the acceleration of the vehicle body. Butthe performance on the deflection of the suspension and the dynamic tire load is not the same. By changing the frequency of sinusoidal excitation, the specific performance of ride comfort parameters in different sinusoidal excitation has been studied

scholarly journals Research on nonlinear modeling and dynamic characteristics of lateral stiffness of vehicle air spring system

2020 ◽  
Vol 12 (6) ◽  
pp. 168781402093045
Author(s):  
Liufeng Xu
Keyword(s):  
Ride Comfort ◽  
Mechanical Performance ◽  
Nonlinear Modeling ◽  
Lateral Stiffness ◽  
Air Spring ◽  
Damping Force ◽  
Stiffness Model ◽  
Spring System ◽  
Stiffness Characteristics ◽  
The Impact

This paper established a lateral stiffness coupling model to investigate the lateral characteristics of air spring system under crosswind conditions. The nonlinear super-elastic characteristics, coupling characteristics of the air spring, lateral stiffness characteristics of emergency spring, and damping force are studied. The accuracy of the lateral stiffness model is validated by comparing with experimental data. In addition, the impact of geometric parameters on the lateral stiffness characteristics is discussed by a sensitivity analysis method, as well as the effect of the lateral stiffness model on vehicle mechanical performance is analyzed. The conclusions show that the lateral stiffness model can well predict the lateral characteristics of the air spring system, and provide theoretical guidance for the parameter design of rail vehicles and vehicle ride comfort improvement.

Sign in / Sign up

Export Citation Format

Share Document