Attitude Control of Air Spring Mounting System Based on Fuzzy Control

2007 ◽  
Author(s):  
Wenjun Bu ◽  
Lin He ◽  
Shujun Shan
Keyword(s):  
Control Strategy ◽  
Attitude Control ◽  
Vibration Isolation ◽  
Dynamic Properties ◽  
Engineering Application ◽  
Air Spring ◽  
Object A ◽  
Constant Change ◽  
Environment Temperature ◽  
Coupling Characteristic

Air spring is a kind of mount with excellent vibration isolation effect and it uses air as its elastic component. But its height is subject to constant change due to air leak or environment temperature and this restricts its engineering application. So some studies on attitude control are carried out, focusing on statically indeterminate and multivariable coupling air spring mounting systems in this paper. The Statically indeterminate problem is transformed through adding the constraint of loading evenness among air springs. After analyzing the model of this controlled object, a new control strategy based on coupling characteristic recognition is presented and combined with fuzzy logic control to realize attitude control of the multivariable coupling system. Finally, a test is conducted to show that the control strategy is feasible and the control system has good static and dynamic properties.

Attitude Control of Air Spring Isolation System

2013 ◽  
Vol 419 ◽  
pp. 636-641
Author(s):  
Liang Shi ◽  
Ying Long Zhao ◽  
Wen Jun Bo
Keyword(s):  
Control Strategy ◽  
Attitude Control ◽  
Vibration Isolation ◽  
Fault Tolerant ◽  
Technical Difficulty ◽  
Isolation Effect ◽  
Control Parameters ◽  
Air Spring ◽  
Isolation System ◽  
Response Characteristics

Air spring has been increasingly applied in marine raft isolation system to acquire excellent vibration isolation effect. However, it is a key technical difficulty to keep attitude balance for the raft. The response characteristics of raft attitude have been analyzed in detail. The raft attitude controllability condition for air spring leakage fault is discussed. The analyzed conclusion lays a foundation for ascertaining control parameters and designing fault tolerant control strategy.

Effect of Carbon Black on Dynamic Properties of Rubber Vulcanizates

1978 ◽  
Vol 51 (3) ◽  
pp. 437-523 ◽  
Author(s):  
A. I. Medalia
Keyword(s):  
Carbon Black ◽  
Vibration Isolation ◽  
Power Transmission ◽  
Dynamic Properties ◽  
Engineering Application ◽  
Mullins Effect ◽  
Rubber Compounds ◽  
Background Material ◽  
Power Transmission Belts ◽  
Transient Forces

Abstract The term dynamic properties as applied to elastomers refers to the response to periodic or transient forces which do not cause failure or appreciable fatigue (permanent change of properties) during the investigation. Generally this is limited to vulcanizates subjected to deformations not exceeding about 25%; and generally the dynamic properties are measured after several cycles or (in a transient experiment such as resilience) after several preconditioning transients, so that the Mullins effect or difference between first and second strain cycles is not of consequence. Thus, dynamic properties represent the viscoelastic properties of vulcanizates at deformations below about 25%, after reaching a pseudo-equilibrium state. The dynamic properties of rubber are altered tremendously by the addition of a filler. The scope of this article is restricted to the dynamic properties of rubber vulcanizates with carbon black as a filler. The effect covered in this article are important in designing rubber compounds to be used under dynamic conditions, such as tires, power transmission belts, vibration isolation mountings, etc. However, the engineering application of dynamic properties, which has been treated in detail elsewhere, is outside the scope of this review. A certain amount of background material is needed. We will first define the terms used in describing dynamic properties. The methods and instruments used for measuring these properties will be described briefly, and the nature of carbon black will be reviewed. Finally, some historical material is given, together with the dynamic behavior of typical compounds, as a preface to the review of more recent work in this field.

Vibration Characteristics of Al6061-SiC Metal Matrix Composite based Rubber Mount for I.C Engine Chassis

2018 ◽  
Vol 10 (3) ◽  
Author(s):  
T. Ramachandran ◽  
S. Sudhakara Reddy ◽  
S. Jeyakumar
Keyword(s):  
Metal Matrix ◽  
Vibration Isolation ◽  
Dynamic Properties ◽  
Engineering Application ◽  
Weight Ratio ◽  
High Strength ◽  
Steel Plates ◽  
Experimental Investigations ◽  
Matrix Composites ◽  
Engine Mount

Vibrations are found to be dangerous and reduce the life and reliability of the vehicle. The studies were carried out by many researchers to stiff the structures by increasing the wall thickness of the plates, rubber and to minimize the vibration by increasing the damping coefficient of the rubber materials. The conventional materials indicate an improvement in stiffness, but not satisfying the requirements of the engine vibration at different speed and load standards and also increased the mass of the structure. This research on the engine mount vibration isolation aims at developing an alternative material for the structures which exhibit good damping and stiffness characteristics. In terms of properties such as chemical resistance, ease of production, high strength to weight ratio and damping, composite materials are increasingly used in many engineering application where the vibration is predominant. In this paper, the steel plates are replaced by Al6061-SiC Metal Matrix Composites (MMC) and studies are carried out on the engine mount made of Al6061 MMC structural material and integrated with rubber. The static and dynamic properties of the Al6061MMC-rubber mounts are determined using experimental investigations. The harmonic analysis is also carried out to test the damping characteristics of the mounts.

Tests and Modeling of a New Vibration Isolation and Suppression Device

2017 ◽  
Vol 139 (12) ◽  
Author(s):  
Zhao-Dong Xu ◽  
Yeshou Xu ◽  
Qianqiu Yang ◽  
Chao Xu ◽  
Feihong Xu ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Energy Dissipation ◽  
Viscoelastic Material ◽  
Vibration Isolation ◽  
Dynamic Properties ◽  
Excitation Frequency ◽  
Dynamic Responses ◽  
Damping Capacity ◽  
Air Spring ◽  
Energy Dissipation Devices

Vibration is an environmental factor with hazardous effects on the instruments' precision, structural stability, and service life in engineering fields. Many kinds of energy dissipation devices have been invented to reduce the dynamic responses of structures and instruments due to environmental excitations. In this paper, a new kind of vibration isolation and suppression device with high damping performance, fine deformation recoverability, and bearing capacity for platform structures is developed, which is designed by considering the combination of the energy dissipation mechanisms of viscoelastic material, viscous fluid, and air spring. A series of dynamic properties tests on the device are carried out under different excitation frequencies and displacement amplitudes, and a mathematical model considering the coupling effects of energy dissipation of viscoelastic material, viscous liquid, and air spring is proposed. The research results indicate that the vibration isolation and suppression device has high damping capacity, and the proposed mathematical model can well describe the mechanical properties affected by excitation frequency and displacement amplitude.

scholarly journals Vibration isolation characteristics and control strategy of parallel air spring system for transportation under abnormal road and eccentric load conditions

2021 ◽  
pp. 002029402199663
Author(s):  
Di Qu ◽  
Xiandong Liu ◽  
Guangtong Liu ◽  
Tian He
Keyword(s):  
Large Deformation ◽  
Control Strategy ◽  
Vibration Isolation ◽  
Air Spring ◽  
Eccentric Load ◽  
Height Control ◽  
Precision Equipment ◽  
Vibration Isolation Performance ◽  
Isolation Performance ◽  
Equal Height

The precision equipment bears the vibration excited by the road roughness during transportation, and faces the risk of damage arising from the vibration. The parallel air spring vibration isolation system (PAVS) has an excellent vibration isolation performance, so has a good application prospect in the precision equipment transportation. But under the conditions of abnormal road and eccentric load, PAVS bears great vibration excitation, and the resulting large deformation of air spring makes the air spring stiffness nonlinear, so to obtain an excellent vibration isolation performance faces a great challenge. Aiming at this problem, based on the measured parameters, the nonlinear dynamics model of PAVS is proposed. Then, the influence of air spring under large deformation on the vibration isolation characteristics is discussed. Finally, under the condition of eccentricity of precision equipment, the vibration isolation characteristics of PAVS with equal height control strategy is investigated. The results show that PAVS with the equal height control strategy has good vibration isolation characteristics. So for the transportation of large precision equipment, PAVS is a potentially useful method.

Theoretical and Experimental Analysis of the Non-Linear Characteristics of an Air Spring With an Orifice

2011 ◽  
Author(s):  
Yasutaka Yokota ◽  
Toshihiko Asami ◽  
Tomohiko Ise ◽  
Itsuro Honda ◽  
Hiroya Sakamoto
Keyword(s):  
Vibration Isolation ◽  
Dynamic Properties ◽  
Flow Characteristics ◽  
Accurate Method ◽  
Air Spring ◽  
Damping Force ◽  
Linear Flow ◽  
Iterative Calculation ◽  
Non Linear ◽  
Amplitude Dependency

This paper proposes a simple but accurate method for calculating the dynamic properties of an air spring employing an orifice to produce a damping force. Air springs are very common in rail, automotive, and vibration isolation applications. However, because this type of air spring has non-linear flow characteristics, an accurate model is yet to be proposed. The restoring and damping forces in an air spring with an orifice damper vary with amplitude. This amplitude dependency has not been considered in previous studies. Proposed herein is a simple model for calculating the air spring constant and damping coefficient. However, iterative calculation is required due to the non-linearity of the spring. The theoretical and experimental results are found to agree well. The theoretical equations provide an effective tool for air spring design.

Theoretical and Experimental Analysis of the Nonlinear Characteristics of an Air Spring With an Orifice

2013 ◽  
Vol 135 (1) ◽  
Author(s):  
Toshihiko Asami ◽  
Yasutaka Yokota ◽  
Tomohiko Ise ◽  
Itsuro Honda ◽  
Hiroya Sakamoto
Keyword(s):  
Vibration Isolation ◽  
Dynamic Properties ◽  
Flow Characteristics ◽  
Accurate Method ◽  
The Body ◽  
Nonlinear Flow ◽  
Air Spring ◽  
Damping Force ◽  
Nonlinear Characteristics ◽  
Amplitude Dependency

We herein propose a simple but accurate method for calculating the dynamic properties of an air spring that uses an orifice to produce a damping force. Air springs are commonly used in rail, automotive, and vibration isolation applications. However, because this type of air spring has nonlinear flow characteristics, accurate approaches have not yet been proposed. The restoring and damping forces in an air spring with an orifice damper vary with the amplitude of the body. This amplitude dependency has not been considered in previous studies. We herein propose a simple model for calculating the air spring constant and damping coefficient. However, this requires iterative calculation due to the nonlinearity of the air spring. The theoretical and experimental results are found to agree well with each other. The theoretical equations provide an effective tool for air spring design.

scholarly journals Huanglongbing Model under the Control Strategy of Discontinuous Removal of Infected Trees

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1164
Author(s):  
Weiwei Ling ◽  
Pinxia Wu ◽  
Xiumei Li ◽  
Liangjin Xie
Keyword(s):  
Infectious Disease ◽  
Global Stability ◽  
Control Strategy ◽  
Theoretical Basis ◽  
Dynamic Properties ◽  
Transmission Mechanism ◽  
Basic Reproductive Number ◽  
Reproductive Number ◽  
Vector Borne ◽  
Citrus Trees

By using differential equations with discontinuous right-hand sides, a dynamic model for vector-borne infectious disease under the discontinuous removal of infected trees was established after understanding the transmission mechanism of Huanglongbing (HLB) disease in citrus trees. Through calculation, the basic reproductive number of the model can be attained and the properties of the model are discussed. On this basis, the existence and global stability of the calculated equilibria are verified. Moreover, it was found that different I0 in the control strategy cannot change the dynamic properties of HLB disease. However, the lower the value of I0, the fewer HLB-infected citrus trees, which provides a theoretical basis for controlling HLB disease and reducing expenditure.

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