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

Advanced Method for Semi-Rigid Joints Design

2015 ◽  
Vol 725-726 ◽  
pp. 710-715 ◽  
Author(s):  
Nikolai Vatin ◽  
Ruslan Bagautdinov ◽  
Konstantin Andreev
Keyword(s):  
Design Process ◽  
Nonlinear Stiffness ◽  
Safety Factors ◽  
Advanced Method ◽  
Stiffness Characteristic ◽  
Rigid Joints

In this paper was presented analysis of the background and was found the most appropriate ways to consider joints stiffness. The design process algorithm is proposed in order to take into account nonlinear stiffness characteristic, complex of economic, ecologic and safety factors for the different joint types.

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.

scholarly journals Design of 3D printable prosthetic foot to implement nonlinear stiffness behavior of human toe joint based on finite element analysis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hui-Jin Um ◽  
Heon-Su Kim ◽  
Woolim Hong ◽  
Hak-Sung Kim ◽  
Pilwon Hur
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Nonlinear Stiffness ◽  
Element Analysis ◽  
Shape Factors ◽  
Prosthetic Foot ◽  
Human Foot ◽  
Stiffness Characteristic ◽  
General Feeling ◽  
Foot Function

AbstractToe joint is known as one of the critical factors in designing a prosthetic foot due to its nonlinear stiffness characteristic. This stiffness characteristic provides a general feeling of springiness in the toe-off and it also affects the ankle kinetics. In this study, the toe part of the prosthetic foot was designed to improve walking performance. The toe joint was implemented as a single part suitable for 3D printing. The various shape factors such as curved shape, bending space, auxetic structure, and bending zone were applied to mimic human foot characteristics. The finite element analysis (FEA) was conducted to simulate terminal stance (from heel-off to toe-off) using the designed prosthetic foot. To find the structure with characteristics similar to the human foot, the optimization was performed based on the toe joint geometries. As a result, the optimized foot showed good agreement with human foot behavior in the toe torque-angle curve. Finally, the simulation conditions were validated by comparing with human walking data and it was confirmed that the designed prosthetic foot structure can implement the human foot function.

A Study on Stiffness Characteristics of Air Spring With FEM

2005 ◽  
Author(s):  
Zhen-Xia Ye ◽  
Hai-Chao Zhu ◽  
Lin He
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Nonlinear Stiffness ◽  
Air Spring ◽  
Element Analysis ◽  
Layer Composite ◽  
Stiffness Characteristics ◽  
The Finite Element Model ◽  
Transversal Stiffness

The vertical and transversal stiffness of the air spring with multi-layer composite material were studied using the nonlinear finite element analysis. The geometrical non-linearity, the nonlinear elasticity and the contacting nonlinearity were analyzed. The finite element model was built in Marc software, and the nonlinear stiffness characteristics were calculated. The influence of parameters on the stiffness characteristics was analyzed.

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.

The territory of the Russian Federation is a rescue from the COVID-19 coronavirus

2020 ◽  
pp. 26-29
Author(s):  
Yu. Kozlov ◽  
R. Serebryakov
Keyword(s):  
Wind Power ◽  
Rural Areas ◽  
Small Area ◽  
Power Plants ◽  
Air Spring ◽  
Atmospheric Air ◽  
Large Cities ◽  
Wind Power Plants ◽  
The World ◽  
The Russian Federation

A new coronavirus pandemic is raging all over the world, especially in densely populated areas. Unlike most countries, more than half of the territory of Russia is not used by humans — which means that it is possible to settle large cities to avoid crowding people on a small area. The authors of the article consider wind power, namely vortex wind power plants, as a new source of energy that can be quickly and with less harm built in rural areas. The article also discusses the possibilities of an alternative Autonomous non-volatile installation "Air spring" for obtaining fresh water from atmospheric air.

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