scholarly journals Wear and Airborne Noise Interdependency at Asperitical Level: Analytical Modelling and Experimental Validation

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7308
Author(s):  
Kevin Lontin ◽  
Muhammad A. Khan
Keyword(s):  
Mild Steel ◽  
Sound Pressure ◽  
Experimental Results ◽  
Analytical Models ◽  
Airborne Sound ◽  
Recorded Sound ◽  
Airborne Noise ◽  
Pin On Disc ◽  
The Relationship ◽  
Theoretical Results

Generation of wear and airborne sound is inevitable during friction processes. Previously, the relationship between the wear and the sound has only been determined experimentally. Analytical models do exist, but they remain rare and do not fully account for the wear and the airborne sound generation especially at the asperitical level. This model attempts to fill the gap by providing a quantifiable relationship at an asperitical level between the wear generated and the sound emitted in a simple pin-on-disc setup. The model was validated for three materials (iron, mild steel, and aluminium T351) under two loads (10 N and 20 N) at 300 RPM. The theoretical model agrees with the experimental results with a varying error of 10 to 15% error in iron and aluminium. However, a larger error is observed in the case of mild steel. The model could be refined to improve the accuracy as it assumes point impacts on the asperities where a distributed impact would be more suitable. Furthermore, the pin is assumed a single asperity to simplify the model at the expense of accuracy. Overall, the experimental results are in good correlation with the theoretical results and this model provides the first step in quantifying wear using only the recorded sound pressure.

scholarly journals Experimental assessment of multiple contact wear using airborne noise under dry and lubricated conditions

2017 ◽  
Vol 231 (12) ◽  
pp. 1503-1516 ◽  
Author(s):  
MA Khan ◽  
Kanza Basit ◽  
SZ Khan ◽  
KA Khan ◽  
AG Starr
Keyword(s):  
Wear Area ◽  
Contact Conditions ◽  
Noise Parameters ◽  
Recorded Sound ◽  
Airborne Noise ◽  
Pin On Disc ◽  
Noise Data ◽  
Wear Damage

The generation of wear and airborne noise is inevitable in the mechanical contacts of the machine components. This paper addresses the effectiveness of the airborne noise data in estimating the wear on a disc under multi-contact conditions. A pin-on-disc rig was employed to study the role of noise parameters on the evolution of the wear area. When a pin slides on the disc, the airborne noise is generated and subsequently a sound signal is obtained. These signals, for various sets of experiments, were recorded using a digital microphone. A Matlab code was developed and employed to estimate the noise parameters from the recorded sound. Noise parameters including values of voltage RMS, noise counts and amplitudes of dominant frequencies were used to analyse the variation in the disc wear at different time intervals. These parameters were found to be effective in the determination of the wear damage evaluation under different loads without lubrication.

Study on Leaking Detecting by Ultrasonic Testing System with Leak Hole Estimation

2012 ◽  
Vol 235 ◽  
pp. 204-209 ◽  
Author(s):  
Hui Heng Xiao ◽  
Tao Wang ◽  
Wei Fan
Keyword(s):  
Reynolds Number ◽  
Ultrasonic Testing ◽  
Sound Pressure ◽  
Experimental Results ◽  
Testing System ◽  
Hole Size ◽  
Fast Detection ◽  
Gas Leak ◽  
The Relationship

The principle of holes leaking create ultrasonic and the relationship between the sound pressure and the pressure or hole size was discussed in this paper. A method of leak hole estimation by the relationship and a design of gas leak ultrasonic testing system were presented. Experimental results which obtained by the gas leak ultrasonic testing system indicated the method is stable, reliable and tallying with the actual results. The method can estimate the leak hole quickly and exactly. Compared with the method of fitting the Reynolds number and amount of leakage, the accuracy has improved to some extent, and it has certain significance in the fast detection of the leak hole size. It could be popularized in the gas leak ultrasonic testing system.

Computing and Analyzing the Sensitivity of Radial-Basis Function Neural Network

2013 ◽  
Vol 321-324 ◽  
pp. 1957-1961
Author(s):  
Jie Li ◽  
Jun Li ◽  
Ying Liu
Keyword(s):  
Neural Network ◽  
Radial Basis Function ◽  
Uniform Distribution ◽  
Basis Function ◽  
Experimental Results ◽  
Radial Basis ◽  
The Relationship ◽  
Theoretical Results ◽  
Input Error ◽  
Good Agreement

This paper proposes an algorithm to compute the sensitivity of the Radial-Basis Function Neural Network (RBFNN) due to the errors of the inputs and others parameters of the net works. For simplicity and practicality, all inputs and weights are assumed to be independent and identically distributed (i.i.d) with uniform distribution. A number of simulations are conducted and the good agreement between the experimental results and the theoretical results verifies the reliability and feasibility of the proposed algorithm. The relationship between the sensitivity of RBFNN and input error and the perturbation of others parameters is given.

Research on Grasping Force of New Type Pneumatic Flexible Finger

2013 ◽  
Vol 401-403 ◽  
pp. 245-249
Author(s):  
Yun Wei Zhao ◽  
De Xu Geng ◽  
Xiao Min Liu ◽  
Jin Tao Zhang
Keyword(s):  
Mathematical Model ◽  
Modular Design ◽  
Normal Pressure ◽  
Experimental Results ◽  
Flexible Joints ◽  
Grasping Force ◽  
New Type ◽  
The Mathematical Model ◽  
The Relationship ◽  
Theoretical Results

This paper develops a new type of flexible finger employing the pneumatic flexible joints base on the modular design concept. In this work, the mathematical model of the grasping force of the flexible finger is derived and analyzed on the relationship between the air pressure and the grasping force. Further the grasping force experiments of finger using dynamometer and acquire the normal pressure of the finger with different combinations ventilation of joints are conducted, Also, the experimental results are compared with the theoretical results, which confirm the validity of the presented model.

Analysis of Interface Deformation of Steel-Concrete-Steel Sandwich Beam

2012 ◽  
Vol 525-526 ◽  
pp. 357-360
Author(s):  
Pei Xiu Xia ◽  
Guang Ping Zou ◽  
Zhong Liang Chang
Keyword(s):  
Sandwich Beam ◽  
Analytical Models ◽  
Sandwich Beams ◽  
Interface Deformation ◽  
Simply Supported ◽  
Interface Slip ◽  
Steel Panels ◽  
Uniformly Distributed Loads ◽  
Relationship Of ◽  
The Relationship

The effect of the interface slip is neglected in most studies on calculating deflection of sandwich beams. By taking a simply supported sandwich beams under uniformly distributed loads as an example, simplified analytical models of the interface slip are established, and corresponding clculation formulas of interface slip between steel panels and concrete and section curvatures are derived. The formula for deflection of sandwich beams are then presented. This formula reflects the relationship of influence each other between the interface slip and deflection.

Parasites and promiscuity: Acute disease salience leads to more restricted sexual attitudes

2021 ◽  
pp. 026540752110309
Author(s):  
James B. Moran ◽  
Nicholas Kerry ◽  
Jin X. Goh ◽  
Damian R. Murray
Keyword(s):  
Social Behavior ◽  
Sexual Attitudes ◽  
Experimental Manipulation ◽  
Sexual Relationships ◽  
Experimental Results ◽  
Acute Disease ◽  
Short Term ◽  
Attitudes And Behaviors ◽  
The Relationship ◽  
Sexual Promiscuity

How does disease threat influence sexual attitudes and behaviors? Although research on the influence of disease threat on social behavior has grown considerably, the relationship between perceived disease threat and sexual attitudes remains unclear. The current preregistered study (analyzed N = 510), investigated how experimental reminders of disease threat influence attitudes and anticipated future behaviors pertaining to short-term sexual relationships, using an ecologically valid disease prime. The central preregistered prediction was that experimental manipulation of disease threat would lead to less favorable attitudes and inclinations toward sexual promiscuity. Results were consistent with this preregistered prediction, relative to both a neutral control condition and a non-disease threat condition. These experimental results were buttressed by the finding that dispositional variation in worry about disease threat predicted less favorable attitudes and inclinations toward short-term sexual relationships. This study represents the first preregistered investigation of the implications of acute disease threat for sexual attitudes.

A Comparison of Theoretical and Experimental Results From Spherical Shells With a Single Radially Attached Nozzle

1967 ◽  
Vol 89 (3) ◽  
pp. 333-338 ◽  
Author(s):  
F. J. Witt ◽  
R. C. Gwaltney ◽  
R. L. Maxwell ◽  
R. W. Holland
Keyword(s):  
Spherical Shell ◽  
Internal Pressure ◽  
Experimental Results ◽  
Strain Gages ◽  
Spherical Shells ◽  
Axial Thrust ◽  
Outside Diameter ◽  
Theoretical Results

A series of steel models having single nozzles radially and nonradially attached to a spherical shell is presently being examined by means of strain gages. Parameters being studied are nozzle dimensions, length of internal nozzle protrusions, and angles of attachment. The loads are internal pressure and axial thrust and moment loadings on the nozzle. This paper presents both experimental and theoretical results from six of the configurations having radially attached nozzles for which the sphere dimensions are equal and the outside diameter of the attached nozzle is constant. In some instances the nozzle protrudes through the vessel.

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