Design, Modeling, Analysis, and Characterization of a Pin-on-Disk Tribometer with a Novel Spring Loading Mechanism

2021 ◽  
pp. 29-39
Author(s):  
Ghulam Hussain ◽  
Shehroze Faisal ◽  
Iftikhar Ahmad ◽  
Wasim Ahmed Khan ◽  
M. Kamran Abbasi ◽  
...  
Keyword(s):  
Modeling Analysis ◽  
Pin On Disk

On the Nonlinear Dynamics of Electromagnetically-Transduced Microresonators

2012 ◽  
Author(s):  
Andrew B. Sabater ◽  
Vijay Kumar ◽  
Aamer Mahmood ◽  
Jeffrey F. Rhoads
Keyword(s):  
Nonlinear Response ◽  
Experimental Characterization ◽  
Complete Understanding ◽  
Mass Sensing ◽  
Permanent Magnetic Field ◽  
Input And Output ◽  
Modeling Analysis ◽  
Electromagnetically Actuated ◽  
A Current

This work investigates the dynamics of electromagnetically-actuated and sensed microresonators. These resonators consist of a silicon microcantilever and a current-carrying metallic wire loop. When placed in a permanent magnetic field, the devices vibrate due to Lorentz interactions. These vibrations, in turn, induce an electromotive force, which can be correlated to the dynamic response of the device. The nature of this transduction process results in an intrinsic coupling between the system’s input and output, which must be analytically and experimentally characterized to fully understand the dynamics of the devices of interest. This paper seeks to address this need through the modeling, analysis, and experimental characterization of the nonlinear response of electromagnetically-transduced microcantilevers in the presence of inductive and resistive coupling between the devices’ input and output ports. A complete understanding of this behavior should enable the application of electromagnetically-transduced microsystems in practical contexts ranging from resonant mass sensing to micromechanical signal processing.

Metallurgical and tribological aspects for squat formation in the aluminothermic weld HAZ edges of rails welded using aluminothermy

2020 ◽  
Vol 72 (9) ◽  
pp. 1123-1131
Author(s):  
Luiz Henrique Dias Alves ◽  
Tiago Carvalho Tepedino ◽  
Mohammad Masoumi ◽  
Gustavo Tressia ◽  
Helio Goldenstein
Keyword(s):  
Weld Metal ◽  
Peer Review ◽  
Microstructural Characterization ◽  
Tensile Tests ◽  
Hardness Profile ◽  
Content Type ◽  
Heavy Haul ◽  
Pin On Disk ◽  
Tribological Characterization

Purpose The purpose of this paper is to present the results of a metallurgical, mechanical and tribological characterization of the weld and heat-affected zone (HAZ) of aluminothermic welding of premium rails used in heavy haul, looking into the origins of the squat defects associated with rail wear. Design/methodology/approach A full factorial design of experiment was carried out for 24 welds of premium and super premium rails. The factors studied were chemical composition, welding gap and preheating time. The welds were inspected visually and by ultrasound to detect superficial and internal defects and characterized by macrographic analysis, hardness profile, tensile tests and microstructural characterization in scanning electronic microscopy. Pin-on-disk test were carried out to compare the tribological behavior of the different regions of the weld rail. Findings Squat formation was shown to be associated with spheroidized pearlite regions formed on the HAZ of the welds, presenting near half the hardness of the weld metal. Thermal analysis showed that spheroidized pearlite is a result of partial austenitization at these positions. Tribological tests showed that low hardness regions presented smaller wear resistance than both the weld metal and the parent rail. Tensile test of the whole region resulted in brittle fracture along the weld metal. Originality/value The results showed that it is essential to reduce the dimensions of the HAZ and the width of the hardness drop area to mitigate squat formation in the HAZ edges. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-01-2020-0020/

Carbonate acidizing: Modeling, analysis, and characterization of wormhole formation and propagation

2015 ◽  
Vol 131 ◽  
pp. 18-33 ◽  
Author(s):  
Mehdi Ghommem ◽  
Weishu Zhao ◽  
Steve Dyer ◽  
Xiangdong Qiu ◽  
Dominic Brady
Keyword(s):  
Modeling Analysis ◽  
Carbonate Acidizing

On the Dynamics of Two Mutually-Coupled, Electromagnetically-Actuated Microbeam Oscillators

2012 ◽  
Vol 7 (3) ◽  
Author(s):  
Andrew B. Sabater ◽  
Jeffrey F. Rhoads
Keyword(s):  
Signal Processing ◽  
Coupled Oscillators ◽  
Practical Applications ◽  
Modeling Analysis ◽  
Predictive Design ◽  
Oscillator Arrays ◽  
And Control ◽  
Electromagnetically Actuated ◽  
Nonlinear Behaviors

This work describes the modeling, analysis, predictive design, and control of self-excited oscillators, and associated arrays, founded upon electromagnetically-actuated microbeams. The study specifically focuses on the characterization of nonlinear behaviors arising in isolated oscillators and small arrays of nearly-identical, mutually-coupled oscillators. The work provides a framework for the exploration of larger oscillator arrays with different forms of coupling and feedback, which can be exploited in practical applications ranging from signal processing to micromechanical neurocomputing.

Wear Characterization of Aluminum Lubricated with Palm Olein at Different Normal Load

2014 ◽  
Vol 554 ◽  
pp. 401-405 ◽  
Author(s):  
Samion Syahrullail ◽  
Ahmad Mohd Azmi ◽  
Norzahir Sapawe ◽  
Amir Khalid
Keyword(s):  
Friction Coefficient ◽  
Palm Olein ◽  
Normal Load ◽  
Pure Aluminum ◽  
Experimental Conditions ◽  
Sliding Mechanism ◽  
Different Types ◽  
Pin On Disk ◽  
Wear Characterization

The pin-on-disk tester is a method used for investigating wear. The sliding mechanism between the pin and the disc experimentally creates wear. In this paper, the wear characteristics of an aluminium pin sliding on an SKD11 disc lubricated with double fraction palm olein were investigated. The pin was made from pure aluminum A1100. The results were compared with those of tests in which the disc was lubricated with commercial hydraulic oil. In both sets of experimental conditions, the normal load varied from 4 to 10 kg. Rotational speed was set to 1200 rpm. From this study, it was found that different types of lubricant affect the wear progression and friction coefficient during a sliding movement. The wear progression and friction coefficient depend also on the load applied, surface roughness, pressure applied and contact surface area.

Broadband Modeling, Analysis, and Characterization of SiGe HBT Terahertz Direct Detectors

2021 ◽  
pp. 1-1
Author(s):  
Marcel Andree ◽  
Janusz Grzyb ◽  
Ritesh Jain ◽  
Bernd Heinemann ◽  
Ullrich R. Pfeiffer
Keyword(s):  
Sige Hbt ◽  
Modeling Analysis

Optical characterization of TiAlON-based film used for solar energy

2014 ◽  
Vol 28 (25) ◽  
pp. 1450196 ◽  
Author(s):  
Minglin Zhao ◽  
Jie Lian ◽  
Zhaozong Sun ◽  
Xiao Wang ◽  
Wenfu Zhang ◽  
...  
Keyword(s):  
Solar Energy ◽  
Photoelectron Spectroscopy ◽  
Optical Constants ◽  
Optical Characterization ◽  
X Ray ◽  
Atomic Force ◽  
Modeling Analysis ◽  
Point Analysis ◽  
Point To Point

Optical characterization of TiAlON film applied in solar energy is presented in this paper. TiAlON -based films with different thicknesses have been deposited by magnetron sputtering. The spectrophotometer and spectroscopic ellipsometry (GES5) have been used to study the samples. Surface morphology and component of the films were investigated using scanning electron microscope (SEM), X-ray diffraction (XRD), atomic force microscope (AFM) and X-ray photoelectron spectroscopy (XPS). The optical constants and film thicknesses of TiAlON films with different thicknesses have been obtained by theoretical modeling analysis fitting (Cauchy model) and point-to-point analysis fitting. Results show that the refraction coefficient and extinction coefficient change with the film thickness increased. Those optical properties are useful for selecting the layers with adequate optical constants and thickness to design a solar selective absorber.

scholarly journals Characterization of the seasonal cycle of south Asian aerosols: A regional-scale modeling analysis

2007 ◽  
Vol 112 (D22) ◽  
Author(s):  
Bhupesh Adhikary ◽  
Gregory R. Carmichael ◽  
Youhua Tang ◽  
L. Ruby Leung ◽  
Yun Qian ◽  
...  
Keyword(s):  
South Asian ◽  
Seasonal Cycle ◽  
Regional Scale ◽  
Scale Modeling ◽  
Modeling Analysis

Characterization of the AISI 304 Alloy Treated in a Large Vacuum Chamber PIII System with a New HV Pulser

2014 ◽  
Vol 802 ◽  
pp. 359-364 ◽  
Author(s):  
Ataide Ribeiro da Silva ◽  
Mario Ueda ◽  
José Osvaldo Rossi ◽  
Matheus Moraes N.F. da Silva ◽  
Mayse do Santos Maciel ◽  
...  
Keyword(s):  
Vacuum Chamber ◽  
Average Power ◽  
Disk Surface ◽  
Industrial Applications ◽  
Nitrogen Plasma ◽  
Large Area ◽  
Aisi 304 ◽  
Pin On Disk ◽  
Surface Diagnostics

Plasma immersion ion implantation (PIII) method is often used to cleaning and enhancing mechanical properties of the surface of materials. In this work, the AISI 304 was treated in a PIII system to improve tribological and wear resistance properties. The new HV pulser was prepared to reach high average power (10 kW) using solid-state technology and a pulse transformer rather than using a conventional one based on hard-tube tetrodes with HV storage capacitors. For preliminary tests, low-density nitrogen plasma and pulses of 10 kV, 30μs width, and 1 kHz were used. A larger vacuum chamber used (600 liters) is very important for treating large area components and for batch processing. This is necessary in industrial applications and in cases that require high quality processing as in spatial or medical components. Stainless steel support was used to hold the samples in our case. XRD, SEM, and pin-on-disk surface diagnostics were used for investigation and characterization of the treated surfaces.

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