scholarly journals Research on the mechanical model of cord-reinforced air spring with winding formation

2021 ◽  
Vol 28 (1) ◽  
pp. 628-637
Author(s):  
Yu-qiang Cheng ◽  
Chang-geng Shuai ◽  
Hua Gao
Keyword(s):  
State Vector ◽  
Integration Method ◽  
Burst Pressure ◽  
Air Spring ◽  
Mechanics Model ◽  
Stiffness Characteristic ◽  
Variation Characteristics ◽  
Stiffness Characteristics ◽  
Iterative Integration ◽  
Thin Shell Theory

Abstract In this article, the parametric model for the stiffness characteristic and burst pressure of cord-reinforced air spring with winding formation is developed. Based on the non-geostrophic winding model and the assumption of cord cross-stability, the cord winding trajectory model of the capsule is established. Then, the anisotropic and nonlinear mechanics model of the capsule with complex cord winding trajectory variation characteristics is constructed by the classical thin-shell theory. The capsule state vector is solved by the extended homogeneous capacity precision integration method. Due to the complex coupling relationship between the capsule state vector and the internal air pressure, the stiffness characteristic is solved by the iterative integration method. The burst pressure of the air spring is solved by the Tsai–Hill strength theory. Eventually, the accuracy and reliability of the proposed method are verified by the experimental results. The effects of the material properties, winding parameters, and geometric structure parameters on stiffness characteristics and burst pressure are discussed. The results of this article provide an important theoretical basis for the performance design of cord-reinforced air springs with winding formation.

A refined stiffness model of rolling lobe air spring with structural parameters and the stiffness characteristics of rubber bellows

Measurement ◽  
2021 ◽  
Vol 169 ◽  
pp. 108355
Author(s):  
Jun-Jie Chen ◽  
Zhi-Hong Yin ◽  
Xian-Ju Yuan ◽  
Guang-Qi Qiu ◽  
Kong-Hui Guo ◽  
...  
Keyword(s):  
Structural Parameters ◽  
Air Spring ◽  
Stiffness Model ◽  
Stiffness Characteristics

Research of Performance Comparison of Topology Structure of Cross-Spring Flexural Pivots

2014 ◽  
Author(s):  
Lang Liu ◽  
Hongzhe Zhao ◽  
Shusheng Bi ◽  
Jingjun Yu
Keyword(s):  
Performance Comparison ◽  
Geometrical Parameters ◽  
Temperature Drift ◽  
Element Analysis ◽  
Small Motion ◽  
Stiffness Characteristic ◽  
The Finite Element Analysis ◽  
Approximate Zero ◽  
Stiffness Variation ◽  
Stiffness Characteristics

Cross-Spring Flexural Pivot (CSFP) has some advantages compared with rigid bearing. However, this kind of flexural pivot is limited in the field of precision positioning due to its small motion stroke, large axis drift, and sensitivity to temperature, etc. In this paper, topology structures of the CSFP were analyzed through defining different geometric parameters λ, spring crossing angle α, and spring number N. Characteristics of stiffness, axis drift, maximum stress, and temperature drift were compared and summarized by the Finite Element Analysis (FEA). Ultimately, a class of flexural pivots, called Inner and Outer Ring Flexural Pivots (IORFP), were selected for their excellent comprehensive performances. This type of flexural pivots has some significant advantages, such as large stroke, approximate zero axis drift and no temperature drift. Finally, the stiffness characteristic of IORFP with different geometrical parameters λ was compared by FEA, and law of stiffness variation was obtained. When λ is 0.1273, the IORFP has linear stiffness characteristics.

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.

Research on Test and Parameter Identification for Nonlinear Stiffness Characteristics of Leaf Spring

2012 ◽  
Vol 602-604 ◽  
pp. 460-463 ◽  
Author(s):  
Yong Jie Lu ◽  
Shao Hua Li ◽  
Cui Yan Wang ◽  
Shuang Yan Li
Keyword(s):  
Ride Comfort ◽  
Least Squares Method ◽  
Structural Features ◽  
Dynamics Simulation ◽  
Leaf Spring ◽  
Nonlinear Characteristics ◽  
Stiffness Characteristic ◽  
Working Principle ◽  
Loading And Unloading ◽  
Stiffness Characteristics

The leaf spring is a key component of heavy vehicle suspension. The stiffness characteristic has an important influence on vehicle ride comfort and road friendliness. Firstly, the structural features and working principle of leaf spring are introduced. Secondly the detail testing scheme of the leaf spring is proposed and the stiffness characteristics are tested through cascaded loading and unloading. The tested results show that the leaf spring has the typical features of non-linearity and hysteresis. In order to satisfy the vehicle dynamics simulation, the Fancher model is chosen to describe leaf spring nonlinear characteristics. Finally, the LSM (Least Squares Method) is utilized to identify five parameters of Fancher model based on experiment results.

A Study on Nonlinear Stiffness Characteristic of Air Spring for a Bus

2002 ◽  
Author(s):  
Hongwei Liu ◽  
Dejun Zhuang ◽  
Yi Lin ◽  
Wangyu Wang ◽  
Fengjun Zhang ◽  
...  
Keyword(s):  
Nonlinear Stiffness ◽  
Air Spring ◽  
Stiffness Characteristic

scholarly journals Mathematical Modeling and Characteristic Analysis of the Vertical Stiffness for Railway Vehicle Air Spring System

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Liufeng Xu
Keyword(s):  
Experimental Tests ◽  
Geometric Parameters ◽  
Railway Vehicle ◽  
Characteristic Analysis ◽  
Air Spring ◽  
Vertical Stiffness ◽  
Stiffness Model ◽  
Spring System ◽  
Stiffness Characteristics ◽  
The Impact

Establishing a correct and reliable vertical stiffness model has an important significance on reproducing the characteristics of an air spring system. In this paper, a dynamic vertical stiffness model is developed based on thermodynamics and fluid dynamics, and geometric parameters are identified by an approximate analytical method. Meanwhile, experimental tests are performed to verify the accuracy and reliability of the proposed model. Furthermore, the impact of geometric parameters on the vertical stiffness characteristics is discussed through a sensitivity analysis. The conclusions show that the dynamic vertical stiffness model can well characterize the dynamic characteristics of the air spring system, which provides a theoretical basis for the optimal design of air spring parameters and the study of mechanical properties.

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.

Modeling and Stiffness Characteristic Analysis of the Semi-Active Interconnected Air Suspension

2014 ◽  
Vol 602-605 ◽  
pp. 220-224
Author(s):  
Li Qin Sun ◽  
Zhen Cui
Keyword(s):  
System Model ◽  
Vehicle Body ◽  
Tire Model ◽  
Spring Stiffness ◽  
Characteristic Analysis ◽  
Air Spring ◽  
Air Suspension ◽  
Stiffness Characteristic ◽  
Working Principle ◽  
Vehicle Dynamic Model

Based on structure and working principle of semi-active interconnected air suspension, whole vehicle dynamic model including interconnected air springs system model, damper model, vehicle body and tire model is established. The changes of parameters such as connect pipe diameter, unilateral or bilateral excitation input phase difference that have effect on the air spring stiffness characteristic are simulated when air springs in the interconnected condition. The simulation results show that, interconnection of air springs can reduce the stiffness of air spring, and vehicle ride performance and riding comfortable performance can also be improved effectively.

A Validated Analytical Solution for the Two-Dimensional Bending of Aluminium Plates under Creep-Ageing Conditions

2014 ◽  
Vol 622-623 ◽  
pp. 1107-1116 ◽  
Author(s):  
Aaron C. Lam ◽  
Jian Guo Lin
Keyword(s):  
Integration Method ◽  
Ageing Time ◽  
Two Dimensional ◽  
Thickness Strain ◽  
Mechanics Model ◽  
Creep Region ◽  
Two Parameters ◽  
Doubly Curved ◽  
Creep Age Forming ◽  
Good Agreement

An analytical method suitable for modelling the creep-age forming (CAF) of doubly curved aluminium plates is presented. This new mechanics model combines an efficient numerical integration method with a robust set of CAF constitutive equations that has been experimentally validated with AA7055 at a CAF condition. Corresponding finite element simulations show good agreement with the analytical results. Using the validated analytical model to investigate a three-stage CAF process (loading, creep-ageing, and unloading), through-thickness strain distributions are studied for aluminium plates that have been subjected to different creep-ageing time. A creep activation point (CAP) is revealed and a correlation is found between the two parameters introduced in this work – the normalised location of CAP, zCAP and normalised bend ratio, β. More specifically, a linear relationship is found between β and zCAP, which indicates that the onset of creep strain, and hence the sizes of the pure elastic core and the outer creep region, can be readily predictable within the limits of study. It is now possible to simulate two-dimensional bending CAF processes for aluminium alloys that have non-spherical precipitates.

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