The Measurement of Friction and Friction-Induced Vibration

1970 ◽  
Vol 92 (4) ◽  
pp. 543-549 ◽  
Author(s):  
P. L. Ko ◽  
C. A. Brockley
Keyword(s):  
Electronic Devices ◽  
Kinetic Friction ◽  
Design Development ◽  
Friction Forces ◽  
Isolation Techniques ◽  
Displacement Transducers ◽  
Pin On Disk ◽  
Triggering Circuit ◽  
Friction Induced Vibration

The design, development, and application of a pin-on-disk tribometer for the measurement of friction and friction-induced vibration is described. Careful isolation techniques eliminated many of the errors in measurement which are associated with vibration arising from the apparatus or the surroundings. The use of acceleration, velocity, and displacement transducers in association with a one-cycle sequence triggering circuit and other electronic devices permitted the accurate measurement of kinetic friction forces in the presence of friction-induced vibration.

Flexure based gripper to grasp hollow objects by internal surface interaction

2021 ◽  
pp. 095440622110498
Author(s):  
Rajesh Kumar ◽  
Harsh Yadav ◽  
Varan Gupta ◽  
Jitendra P Khatait
Keyword(s):  
Internal Surface ◽  
Surface Interaction ◽  
Design Development ◽  
Friction Forces ◽  
Normal Forces ◽  
Inner Surface

The paper focuses on the design, development, and evaluation of a gripper intended to hold hollow objects by interacting with the inner surface. The gripper moves towards the inside of the hollow object and grips it using the friction forces applied on the surface of the object. The design also ensures the application of variable normal forces on the surface of the object to be grasped. The mathematical architecture is verified using prototypes and experiments.

scholarly journals Dependence of Pin Surface Roughness for Friction Forces of Ultrathin Perfluoropolyether Lubricant Film on Magnetic Disks by Pin-on-Disk Test

2012 ◽  
Vol 2012 ◽  
pp. 1-7
Author(s):  
H. Tani ◽  
Y. Mitsuya ◽  
T. Kitagawa ◽  
N. Tagawa
Keyword(s):  
Surface Roughness ◽  
Ion Beam ◽  
Lubricant Film ◽  
Friction Forces ◽  
Magnetic Disks ◽  
End Groups ◽  
Cluster Ion ◽  
Perfluoropolyether Lubricant ◽  
Gas Cluster Ion Beam ◽  
Pin On Disk

We fabricated supersmooth probes for use in pin-on-disk sliding tests by applying gas cluster ion beam irradiation to glass convex lenses. In the fabrication process, various changes were made to the irradiation conditions; these included one-step irradiation of Ar clusters or two-step irradiation of Ar and N2clusters, with or without Ar cluster-assisted tough carbon deposition prior to N2irradiation, and the application of various ion doses onto the surface. We successfully obtained probes with a centerline averaged surface roughness that ranged widely from 1.08 to 4.30 nm. Using these probes, we measured the friction forces exerted on magnetic disks coated with a molecularly thin lubricant film. Perfluoropolyether lubricant films with different numbers of hydroxyl end groups were compared, and our results indicated that the friction force increases as the surface roughness of the pin decreases and that increases as the number of hydroxyl end groups increases.

Rotational Energy Harvesting Systems for Unpowered Freight Rail Cars

2010 ◽  
Author(s):  
C. Nagode ◽  
M. Ahmadian ◽  
S. Taheri
Keyword(s):  
Energy Harvesting ◽  
Shock Absorber ◽  
Electronic Devices ◽  
Electric Energy ◽  
Rotational Energy ◽  
Coil Spring ◽  
Design Development ◽  
Harvesting Systems ◽  
Electromagnetic Energy Harvesting ◽  
Railroad Applications

Commonly, freight cars have no available source of electric power, thus preventing the use of any electronic devices that could improve convenience, performance, and efficiency of railroad operations. The devices introduced in this paper are motion-based electromagnetic energy harvesting systems. Similar in size and shape to a conventional damper or shock absorber, the systems are to be placed in the coil spring of the suspension to convert part of the energy usually wasted as heat into useful electric energy. This paper will present the design, development and testing of such devices. Tests of prototype devices on a shock dynamometer show that more than 20 Watts RMS of power can be produced with motions that can be encountered in train suspensions. The devices presented, although primarily developed for railroad applications, are not limited to use in freight cars and could be similarly applied in various vehicles with suspension like tractor-trailers, buses or automobiles.

scholarly journals Mechatronics Education in School of Design – Development of Educational Tool to Study Design Expression Using Mechatronics

2011 ◽  
Vol 23 (5) ◽  
pp. 629-637 ◽  
Author(s):  
Atsushi Mitani ◽  
◽  
Tamon Hosoya
Keyword(s):  
Product Design ◽  
Study Design ◽  
Electronic Devices ◽  
Educational Tool ◽  
Design Development ◽  
Human Actions ◽  
Printed Circuit ◽  
Actual Model ◽  
Control Feedback

We developed a printed circuit substrate for studying electronic devices and a PIC processor for design expressions in the mechatronics class of Sapporo City University, School of Design, Product Design Course. We then taught PIC assembler programming for LED blinking control, feedback from sensors and switches, the servomotor driving, and sequential feedback. Students in this class was given a subject to realize an actual model for the design expression of something that moves in reaction to human actions using these skills.

The Effects of Load and Velocity on Friction and Interface Temperature of CGRP Sliding Against Smooth Stainless Steel

2006 ◽  
Author(s):  
B. F. Yousif ◽  
N. S. El-Tayeb ◽  
T. F. Yusaf
Keyword(s):  
Stainless Steel ◽  
Experimental Tests ◽  
Interface Temperature ◽  
Direction Parallel ◽  
Friction Forces ◽  
Temperature Characteristics ◽  
Chopped Strand Mat ◽  
Pin On Disk ◽  
Worn Surface ◽  
Sliding Distance

This paper presents an experimental investigation to study friction and interface temperature characteristics of chopped strand mat fiberglass (type-R) reinforced polyester (CGRP) sliding against smooth stainless steel. Pin-on-disk (POD) apparatus is used to perform the experimental tests under dry sliding condition at room temperature. Several parameters are considered, namely load (30, 60 & 90N), sliding velocity (2.8, 3.52 & 3.9m/s) and sliding distance (0–2.51km). Three different orientations of chopped strand mat with respect to sliding direction, Parallel (P), Anti-parallel (AP) and Normal orientations (N) are investigated. Continuous measurements of friction forces using strain gauges, and interface temperatures using infrared thermometer are performed. In addition, Scanning electron microscopy (SEM) is used to study the worn surface to verify the results. Experimental results show that specimen’s orientations and the tested parameters play a major role in controlling friction and interface temperature characteristics of the CGRP/stainless steel. Maximum friction coefficient was taken place in AP orientation at 3.5 m/s and 2.5km, which was about 0.6. Although, AP-orientation had higher friction interface temperature in comparing to P and N-orientations, which was about 48°C at 3.9m/s and 2.5km.

scholarly journals PhET-assisted electronic student worksheets of physics (eSWoP) on heat for inquiry learning during covid

2021 ◽  
Vol 2104 (1) ◽  
pp. 012030
Author(s):  
A S Budi ◽  
S W Sari ◽  
L A Sanjaya ◽  
F C Wibowo ◽  
I M Astra ◽  
...  
Keyword(s):  
Research Methods ◽  
Electronic Devices ◽  
Inquiry Learning ◽  
Evaluation Research ◽  
Learning Motivation ◽  
Teaching Material ◽  
Design Development ◽  
Physics Learning ◽  
Inquiry Process ◽  
Teaching Physics

Abstract Now, this is referred to as the industrial era 4.0, which is present simultaneously as the era of disruption. Therefore, this study aims to produce Electronic Student Worksheets of Physics (eSWoP) with the help of Sway to use PhET Simulations on physics learning about temperature and heat. This research was conducted using ADDIE (Analyze, Design, Development, Implementation, and Evaluation) research methods. The sample for the application of eSWoP used in the study was 86 students aged 16-18 years from a province in Indonesia. The result of this study is a PhET-assisted eSWoP teaching material that can be used through various electronic devices, using PhET simulations that can help students understand physics subjects at temperature and heat. In the questionnaire given to students, information was obtained that eSWoP media is useful, easy to use and can increase students’ learning motivation. It was suggested that eSWoP technology could be a powerful and effective tool to enable students from the physics lesson into the inquiry process. Moreover, the implications of using eSWoP for teaching physics and recommendations for further studies are also discussed in this study.

scholarly journals Quasi-Harmonic Friction-Induced Vibration

1970 ◽  
Vol 92 (4) ◽  
pp. 550-556 ◽  
Author(s):  
C. A. Brockley ◽  
P. L. Ko
Keyword(s):  
Experimental Investigation ◽  
Friction Velocity ◽  
Velocity Curve ◽  
Harmonic Vibration ◽  
Dynamic Friction ◽  
Sliding Velocity ◽  
Friction Forces ◽  
Automatic Transmissions ◽  
Friction Induced Vibration

A theoretical and experimental investigation of quasi-harmonic friction-induced vibration is reported. The vibration is of near-sinusoidal form and is solely governed by dynamic friction forces. However, the friction-velocity curve must be of a particular shape for the vibration to occur. The amplitude of the quasi-harmonic vibration is shown to increase with sliding velocity until oscillation ceases at some upper velocity boundary. The introduction of suitable damping will quench the vibration entirely. The vibration can exist at high sliding velocities and as a consequence may influence the operation of automatic transmissions, brakes, and clutches.

scholarly journals On the Effect of Friction on Tibiofemoral Joint Kinematics

2021 ◽  
Vol 11 (16) ◽  
pp. 7516
Author(s):  
Ehsan Askari ◽  
Michael S. Andersen
Keyword(s):  
Nonlinear Dynamics ◽  
Knee Joint ◽  
Soft Tissues ◽  
Research Work ◽  
Computational Time ◽  
Elastic Model ◽  
Friction Forces ◽  
Normal Contact ◽  
Mesh Density ◽  
Friction Induced Vibration

The effect of friction on nonlinear dynamics and vibration of total knee arthroplasties is yet to be investigated and understood. This research work aims at studying the influence of friction on nonlinear dynamics, friction-induced vibration, and damage of tibiofemoral joints. For this purpose, a spatial dynamic knee model is developed using an asymmetric nonlinear elastic model accounting for knee joint ligaments and a penalty contact model to compute normal contact stresses in the joint while contact detection is treated such that the associated computational time is reduced. Several friction models are considered and embedded in the dynamic model to estimate tangential friction forces in the knee joint. External loads and moments, due to the presence of all soft tissues, e.g., muscles and hip-joint reaction forces, applied to the femoral bone are determined using a musculoskeletal approach. In the post-processing stage, damage, i.e., wear and creep, are estimated using three wear models and an empirical creep formulation, respectively. In addition, a FFT analysis is performed to evaluate likely friction-induced vibration of tibiofemoral joints. Mesh density analysis is performed and the methodology is assessed against outcomes available in the literature. It can be concluded that friction influences not only the tribology, but also dynamics of the knee joint, and friction-induced vibration is likely to take place when the friction coefficient increases.

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