Study on Friction Characteristics of Energizing Pneumatic Cylinders

2014 ◽  
Vol 904 ◽  
pp. 306-310 ◽  
Author(s):  
Yan Jia Zhan ◽  
Tao Wang ◽  
Bo Wang
Keyword(s):  
Special Kind ◽  
Friction Model ◽  
Pneumatic Cylinder ◽  
Working Pressure ◽  
Friction Characteristics ◽  
Factors Affecting ◽  
Output Force ◽  
Experimental Apparatus ◽  
Depth Study ◽  
Pneumatic Cylinders

As a special kind of pneumatic cylinder, energizing pneumatic cylinder can increase the output force without changing diameter by a series of two or more piston on a piston rod. Since the friction characteristics of pneumatic cylinders is one of the most important factors affecting the nonlinearity, a new experimental apparatus is designed to have an in-depth study, base on exhaust throttle. The friction of energizing pneumatic cylinder was tested under different working pressure and velocity to ascertain the parameters of stribeck model. The results show that friction model of the energizing pneumatic cylinder can be the superposition of the models of each piston.

scholarly journals Development, Kinematic Modeling and Analysis of 3 (DoF) Pneumatic Gantry Robot

2020 ◽  
Vol 5 (6) ◽  
pp. 646-650
Author(s):  
Awad Eisa G. Mohamed ◽  
Abuobeida Mohammed Elhassan
Keyword(s):  
Controller Design ◽  
Low Cost ◽  
Weight Ratio ◽  
Friction Model ◽  
Pneumatic Cylinder ◽  
Kinematic Modeling ◽  
Low Friction ◽  
Modeling And Analysis ◽  
Gantry Robot ◽  
Pneumatic Cylinders

Low friction pneumatic cylinders are now being considered in applications for which only electric motors or hydraulics were previously considered suitable. One potential application of low friction pneumatics is robotic for metallurgical operations where the high power to weight ratio and low cost could be exploited. As part of an ongoing project to develop a pneumatic robot, this paper presents the kinematic analysis of pneumatic cylinder characteristics that simplifies controller design. Using mathematical modeling and simulation, non-linearity of modern pneumatic systems have been investigated. The derived models give an excellent representation of the system, despite the inclusion of a simplified friction model.

Research on a New Model for Accelerated Life Test of Pneumatic Cylinders

2010 ◽  
Vol 40-41 ◽  
pp. 760-765 ◽  
Author(s):  
Chuan Dong Bai ◽  
Yan Wang ◽  
De Yi Wang
Keyword(s):  
Test Data ◽  
Accelerated Life Testing ◽  
Accelerated Life Test ◽  
Pneumatic Cylinder ◽  
Life Test ◽  
Working Pressure ◽  
Accelerated Life ◽  
Long Lifetime ◽  
Log Linear ◽  
Pneumatic Cylinders

Pneumatic cylinders, as a long lifetime product, are used continuously under normal conditions. So Accelerated Life Testing is an important tool to get information quickly on lifetime which is achieved by subjecting the test cylinders to conditions that are more severe than the normal ones. This paper firstly analyze the failure mechanism of pneumatic cylinder, then based on the General Log-Linear relationship and Weibull distribution, describes a model for multiple stress-type accelerated life data analysis. The paper gives the parameter statistical method of the mode by using likelihood theory. Based on the test data from ALT of pneumatic cylinders which adopt four test stresses including air temperature, motion frequency, working pressure and operation velocity, the parameter of the model are fitted. According to the test data and the estimated model, the paper extrapolates the pneumatic cylinder’s lifetime information under the normal user level.

Study of the effects of relative humidity and velocity on the friction characteristics of pneumatic cylinders

2020 ◽  
Vol 34 (22n24) ◽  
pp. 2040139
Author(s):  
Thuy-Duong Nguyen ◽  
Van-Hung Pham
Keyword(s):  
Relative Humidity ◽  
Sliding Friction ◽  
Static Friction ◽  
Pneumatic Cylinder ◽  
Dynamic Friction ◽  
Friction Forces ◽  
Measuring Device ◽  
Friction Characteristics ◽  
Rod Seals ◽  
Pneumatic Cylinders

The movement of a piston rod in a pneumatic cylinder is directly affected by the air humidity in the atmosphere, especially in the case of piston rods without any means of protection or grease on their surfaces. In a pneumatic cylinder system, the friction between the piston rod and the rod seal is sliding friction, and it has a significant value that varies with the variation in the moisture on the piston rod’s surface. In this paper, an investigation of the friction characteristics of piston rods and rod seals in a pneumatic cylinder was carried out with different humidity and velocity values to understand the effect of lubricants on the moving parts of pneumatic systems in humid environments, where the friction characteristics of the displacements corresponding to the static and dynamic friction forces were displayed on a measuring device. The research results showed that the static friction forces tended to decrease by [Formula: see text] and that the dynamic friction forces tended to decrease by [Formula: see text] when the relative humidity increased from 51% to 99% at different velocities between 5 and 100 mm/s.

Development of Accelerated Life Test Method of Pneumatic Cylinder

2006 ◽  
Vol 326-328 ◽  
pp. 653-656 ◽  
Author(s):  
Bo Sik Kang ◽  
H.E. Kim ◽  
Yong Cheol Kwon ◽  
Chang Seop Song
Keyword(s):  
Test Method ◽  
Accelerated Life Test ◽  
Test Time ◽  
Pneumatic Cylinder ◽  
Life Test ◽  
Working Pressure ◽  
Piston Velocity ◽  
Working Temperature ◽  
Accelerated Life ◽  
Pneumatic Cylinders

This paper proposed a new life test method of pneumatic cylinders used in pneumatic system, whose loads consist of working pressure, piston velocity, and working temperature. It is expected to reduce accelerated life test time greatly in case of accelerated life test with creating combined accelerated model of these three factors. We can determine the maximum accelerated factor by calculating the combined accelerated factor of working pressure, piston velocity and working temperature for various cases.

scholarly journals Experimental investigation of friction behavior in pre-sliding regime for pneumatic cylinder

2014 ◽  
Vol 36 (4) ◽  
pp. 283-290
Author(s):  
Tran Xuan Bo ◽  
Pham Tat Thang ◽  
Do Thanh Cong ◽  
Ngo Sy Loc
Keyword(s):  
Friction Force ◽  
Friction Model ◽  
Operating Conditions ◽  
Experimental Results ◽  
Hysteretic Behavior ◽  
Pneumatic Cylinder ◽  
Experimental Investigations ◽  
Friction Behavior ◽  
Piston Displacement ◽  
Pneumatic Cylinders

Friction always presents in pneumatic cylinders and causes difficulties in controlling position and velocity of pneumatic systems. In order to improve the control performance of the pneumatic systems, it is necessary to fully understand behavior of friction in the pneumatic cylinders. So far, dynamic friction behavior of pneumatic cylinders has been investigated but mainly focused on the friction behavior in sliding regime. In pre-sliding regime, friction behavior has not been investigated. In this paper, experimental investigations of friction behavior of a pneumatic cylinder in pre-sliding regime are made. The friction force is calculated from the equation of motion of the piston using the measured values of pressures in the two cylinder chambers and the piston displacement. The pressures are controlled by using two proportional pressure control valve. The friction force versus piston displacement characteristics are measured and analysed under various operating conditions of the applied force and the pressures. Experimental results show that: i) the piston motion in pre-sliding regime exhibits a nonlinear spring behavior; ii) hysteretic behavior with nonlocal memory is verified; iii) the pressures have influence only on the size of the hysteretic loop. These experimental results can be applied to develop a friction model for pneumatic cylinders.

Study on GPS Navigation Navigation System

2014 ◽  
Vol 556-562 ◽  
pp. 3313-3316
Author(s):  
Hao Ran Song
Keyword(s):  
Global Positioning System ◽  
Navigation System ◽  
Systems Design ◽  
Design System ◽  
Factors Affecting ◽  
Gps Navigation ◽  
Communications Technologies ◽  
Global Positioning ◽  
Depth Study ◽  
System Requirements

Currently, GPS global positioning system has been in the areas of precise positioning, navigation, timing has been widely used. By GPS-OEM combined with computer and communications technologies, users are able to easily and independently developed to meet the specific needs of GPS systems. Design system based on GPS navigation navigation system requirements package, in-depth study of the main factors affecting the precision of navigation. Several factors made corresponding solutions, implements navigation navigation system the main functions of the software.

Research of Particle Mechanics Application Based on Conveying Machinery

2014 ◽  
Vol 1021 ◽  
pp. 218-221
Author(s):  
Zhi Qiang Xu
Keyword(s):  
Mechanical Properties ◽  
Qualitative Research ◽  
Friction And Wear ◽  
Applied Research ◽  
Conveyor Belt ◽  
Mechanical Analysis ◽  
Conveyer Belt ◽  
Friction Characteristics ◽  
Factors Affecting ◽  
Belt Conveyors

The conveyer belt is a major component of the conveyor , whose cost accounted for half of the of the entire cost of the conveyor. The loss of the conveyor is mainly due to the use of friction and wear generated in the process, so study on the friction characteristics is very meaningful. The friction and wear of the conveyor is one of the factors affecting their life. Therefore, conducting applied research on belt conveyors and mechanical analysis becomes increasingly important. In this paper, some qualitative research on the mechanical properties is carried out, starting from the application of the conveyor belt.

Analysis of the Impact of Organisational Factors in Managerial Hospitality Configurations

2002 ◽  
Vol 4 (2) ◽  
pp. 130-143
Author(s):  
Mercedes Melchior Navarro ◽  
Eduardo Parra López ◽  
Angel Ramos Domínguez
Keyword(s):  
Structural Changes ◽  
Cultural Development ◽  
Regional Economic Growth ◽  
Competitive Advantages ◽  
Factors Affecting ◽  
Depth Study ◽  
Hospitality Sector ◽  
Tourism Destinations ◽  
Organisational Factors ◽  
The Impact

Tourist activity constitutes one of the signs of economic and socio-cultural development in the Canaries; it is considered the fundamental and strategic point of regional economic growth and the driving force behind the growth of other sectors. This paper attempts to define and provide a more in-depth study and awareness of these questions. For this reason, the prompt identification and appropriate response to these structural changes and new demands will aid the hospitality sector in achieving suitable competitive advantages. The aim of the paper is to analyse various organisational factors affecting hotel units located in different tourism destinations in the Canary Islands and to study distinctive organisational populations, with their own contextual and structural answers.

Detecting pneumatic actuator leakage using acoustic emission monitoring

2020 ◽  
Vol 62 (1) ◽  
pp. 22-26
Author(s):  
H Mahmoud ◽  
P Mazal ◽  
F Vlašic
Keyword(s):  
Acoustic Emission ◽  
Root Mean Square ◽  
Diagnostic Procedure ◽  
Pneumatic Cylinder ◽  
Mean Square ◽  
Emission Testing ◽  
Acoustic Emission Testing ◽  
Maximum Root ◽  
The Difference ◽  
Pneumatic Cylinders

This paper focuses on the development of an efficient new diagnostic procedure for checking the function of pneumatic cylinders using acoustic emission. This diagnostic procedure is able to detect distinctive differences that determine whether the cylinder is damaged or undamaged. Moreover, the paper aims to find the diagnostic criteria that can be used to evaluate the pneumatic cylinder and detect defects. In this study, acoustic emission testing of several undamaged cylinders is carried out before artificial defects are created in each one. The signals from the progress and retreat strokes are recorded and analysed according to many parameters. The root mean square is normalised and the different responses of damaged and undamaged pneumatic cylinders are recognised by the time delay of the strokes. The differences are identified by comparing the maximum root mean square from sensor A and the maximum root mean square from sensor B for one cycle in the retreat stroke. The damaged and undamaged cylinders are distinguished using the difference in energy values present in the signals of the two sensors in the retreat stroke. The final evaluation of the cylinder is determined by calculating the total value of the root mean square. This paper is a continuation of a prior article and the extension of that work.

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