Influence of ultrasonic oscillations on static friction characteristics of pneumatic cylinder

2011 ◽  
Author(s):  
Cheng Tinghai ◽  
Gao Han ◽  
Bao Gang ◽  
Guo Xiangdong
Keyword(s):  
Static Friction ◽  
Pneumatic Cylinder ◽  
Friction Characteristics ◽  
Ultrasonic Oscillations

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.

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 of the high precision measurement device of static friction characteristics between surfaces at the fixed coupling section

2019 ◽  
Vol 85 (878) ◽  
pp. 19-00275-19-00275
Author(s):  
Fumihiko INAGAKI ◽  
Noboru MORITA ◽  
Hirofumi HIDAI ◽  
Souta MATSUSAKA ◽  
Tatsuo OHMORI ◽  
...  
Keyword(s):  
High Precision ◽  
Precision Measurement ◽  
Static Friction ◽  
High Precision Measurement ◽  
Measurement Device ◽  
Friction Characteristics ◽  
Fixed Coupling

scholarly journals The THE EFFECT OF HUMID TROPICAL CLIMATE ON FRICTION CHARACTERISTIC OF PNEUMATIC CYLINDERS

2021 ◽  
pp. 1-6
Author(s):  
Thuy Nguyen ◽  
Van Hung Pham
Keyword(s):  
Relative Humidity ◽  
Friction Force ◽  
Static Friction ◽  
Tropical Climate ◽  
Pneumatic Cylinder ◽  
Friction Characteristic ◽  
Humid Tropical Climate ◽  
Geographical Regions ◽  
Climatic Environment ◽  
Pneumatic Cylinders

The pneumatic cylinder is influenced by many various factors at work, including the climate environment. The climatic environment consists of two characteristic factors as temperature (T) and relative humidity (RH), which change according to seasons and different geographical regions. Therefore, changing the climate characteristic factors will affect the friction characteristic of pneumatic cylinders when operating at different speeds. This article presents empirical research on the simultaneous effects of temperature and relative humidity of the environment with the humid tropical climate in Vietnam on the pneumatic cylinder's friction properties. According to experimental planning, the studies were conducted on industrial pneumatic cylinders with two input factors: the temperature of 150C, 320C and 490C and relative humidity of 51%, 75% and 99%, with velocities of 30, 50 and 100 mm/s. The results show that the static friction force and dynamic friction decrease when T, RH increases, and the influence of air relative humidity on friction force is more significant than temperature. The experiment also gives an empirical regression equation on the relationship of friction in the pneumatic cylinder, depending on the two factors of temperature and relative humidity of the humid tropical climate in Vietnam with velocities of 30, 50 and 100 mm/s.

scholarly journals Effect of Temperature on Static Friction Characteristics for Silicon Wafer/Silicon Wafer Contact

1994 ◽  
Vol 114 (2) ◽  
pp. 168-172 ◽  
Author(s):  
Shigeru Watanabe ◽  
Masafumi Suzuki ◽  
Noboru Yoshimura ◽  
Hiroyuki Fujita
Keyword(s):  
Silicon Wafer ◽  
Static Friction ◽  
Effect Of Temperature ◽  
Friction Characteristics

The effect of moisture on friction coefficient of fabrics used on taekwondo personal protective equipment

2018 ◽  
Vol 233 (1) ◽  
pp. 87-94
Author(s):  
WL Li ◽  
HY Shen ◽  
JT Hung ◽  
CP Shih
Keyword(s):  
Friction Coefficient ◽  
Personal Protective Equipment ◽  
Static Friction ◽  
Original Position ◽  
Protective Equipment ◽  
Friction Characteristics ◽  
Weft Knitted Fabric ◽  
Forearm Skin ◽  
Dry Conditions ◽  
Selection Of

The purpose of this study was to investigate the friction characteristics of different fabrics used in personal protective equipment worn during competition and matches. During vigorous taekwondo activity, sweat, movement, and body collisions may cause personal protective equipment to slide from its original position and accordingly fail to protect the athletes effectively. Therefore, a thorough study investigating the friction characteristics among different fabrics used in personal protective equipment and its effect on the skin is needed. This study is intended to be helpful for the athletes in the selection of appropriate personal protective equipment fabrics. Universal Nano + Micro + Macro Materials Tester was used in friction tests between six different personal protective equipment fabrics and the dorsum forearm skin to obtain the coefficients of kinetic friction and static friction. The results indicated that PVC faux leather showed better anti-skid performance under dry conditions. Under wet conditions, however, the friction coefficient of PVC faux leather decreased significantly due to lubrication, and thus lowered the anti-skid performance. In addition, the friction coefficient of fabrics with better water absorption or drainage capacity showed greater adhesion with the increasing of skin hydration. In particular, 100% polyester weft-knitted fabric showed better anti-skid performance under wet conditions. The result of this study provides a good reference in the selection and design of Taekwondo personal protective equipment for athletes, coaches, and manufacturers.

The Influence of Lubricants on Static Friction Characteristics Under Boundary Lubrication

1985 ◽  
Vol 107 (2) ◽  
pp. 188-194 ◽  
Author(s):  
S. Kato ◽  
E. Marui ◽  
A. Kobayashi ◽  
S. Senda
Keyword(s):  
Machine Tool ◽  
Surface Topography ◽  
Contact Pressure ◽  
Boundary Lubrication ◽  
Carrying Capacity ◽  
Static Friction ◽  
Load Carrying Capacity ◽  
Sliding Speed ◽  
Friction Characteristics ◽  
Load Carrying

Based on a new boundary lubrication model, the characteristics of lubricants under boundary lubrication at low sliding speed and low contact pressure such as in machine tool slideways are investigated in relation to surface topography. It is clarified theoretically and ascertained experimentally that the property of lubricants under boundary lubrication can be estimated by the newly defined appraisal coefficient of boundary lubrication property determined by the thickness and load carrying capacity of adsorbed lubricant film and the surface topography.

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