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Journal articles on the topic 'Transient friction measurement'

Author: Grafiati

Published: 6 September 2023

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1

Li, Yufeng, and Aric Kumaran Menon. "A Theoretical Analysis of Breakaway Friction Measurement." Journal of Tribology 116, no. 2 (1994): 280–86. http://dx.doi.org/10.1115/1.2927210.

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The transient response of an I-beam friction measurement system to a constant disk acceleration is theoretically analyzed. The friction measurement system is modeled as a single-degree-of-freedom system. It is found that the true breakaway friction is different from the measured breakaway friction, and that the true breakaway time is also different from the measured breakaway time. The system measurement error is evaluated as a function of the acceleration, the effective mass, the spring stiffness, as well as the static and kinetic coefficients of friction. A closed-form dimensionless solution

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2

Prölß, Maximilian, Hubert Schwarze, Thomas Hagemann, Philipp Zemella, and Philipp Winking. "Theoretical and Experimental Investigations on Transient Run-Up Procedures of Journal Bearings Including Mixed Friction Conditions." Lubricants 6, no. 4 (2018): 105. http://dx.doi.org/10.3390/lubricants6040105.

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This paper focuses on the operating behavior of journal bearings for industrial machinery application during run-ups. For this purpose, a numerical simulation code that is based on a two-dimensional extended and generalized Reynolds equation and a full three-dimensional energy equation, was advanced by a theoretical model considering the effects of mixed friction and warming of journal components during start-up. The mixed friction routine contained the elastic half-spaces model proposed by Boussinesq, which considers the influence of rough surfaces by implementing flow factors and calculates

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3

Hoić, Matija, Alen Miklik, Milan Kostelac, Joško Deur, and Andreas Tissot. "Analysis of the Accuracy of Mass Difference-Based Measurement of Dry Clutch Friction Material Wear." Materials 14, no. 18 (2021): 5356. http://dx.doi.org/10.3390/ma14185356.

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The paper demonstrates that the dry clutch friction plate wear rate, measured based on the plate mass difference method, exhibits a transient behavior after each change of friction interface temperature level. The effect is hypothesized to be caused by a temperature-dependent change in the moisture content/mass level in the friction material. To test this hypothesis, a series of synchronized characterization experiments have been conducted by using two friction plates, one for wear tests and the other for drying in an oven under the same temperature conditions. Based on the analysis of test re

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4

Hwang, J. J., G. J. Hwang, R. H. Yeh, and C. H. Chao. "Measurement of Interstitial Convective Heat Transfer and Frictional Drag for Flow Across Metal Foams." Journal of Heat Transfer 124, no. 1 (2001): 120–29. http://dx.doi.org/10.1115/1.1416690.

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Convective heat transfer and friction drag in a duct inserted with aluminum foams have been studied experimentally. The combined effects of foam porosity (ε=0.7, 0.8, and 0.95) and flow Reynolds number (1900⩽Re⩽7800) are examined. Frictional drags for flow across the aluminum foam are measured by pressure taps, while interstitial heat transfer coefficients in the aluminum foam are determined using a transient single-blow technique with a thermal non-equilibrium two-equation model. Solid material temperature distribution is further measured for double check of the heat transfer results. To unde

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5

Wei, Wei, Jian Wei Yu, Tao You, Xiao Fen Yu, and Yong Hong Wang. "Evaluation of the Transient Temperature Distribution of End-Face Sliding Friction Pair Using Infrared Thermometry." Key Engineering Materials 613 (May 2014): 213–18. http://dx.doi.org/10.4028/www.scientific.net/kem.613.213.

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A real-time temperature measurement system was designed for end-face sliding friction pairs with an infrared (IR) probe and IR thermography installed on it. The approximate temperature of contact surface was measured by the probe while non-contact surface’s temperature distribution was determined with the IR thermography. Two experiments with constant load but varied rotational speeds were carried out, and a preliminary study was made to analyze the variation of temperature in the friction process. Furthermore, the probe data was used as thermal load to calculate the temperature field by the F

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6

Gulino, R., S. Bair, W. O. Winer, and B. Bhushan. "Temperature Measurement of Microscopic Areas Within a Simulated Head/Tape Interface Using Infrared Radiometric Technique." Journal of Tribology 108, no. 1 (1986): 29–34. http://dx.doi.org/10.1115/1.3261139.

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This study concerns the infrared measurement of steady-state and transient temperatures of microscopic areas within the contact region formed by a magnetic tape passing over a simulated recording head. This research demonstrates that the tape surface temperature can be measured within specific limits of response time and sensitivity. Due to its high tranmissivity in the relevant infrared band, sapphire was chosen as the material to be used in the fabrication of a simulated recording head. A Barnes RM2A infrared microscope was the principle radiometer used, while a best effort was made in scann

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7

Meng, Fei, and Junqiang Xi. "Numerical and Experimental Investigation of Temperature Distribution for Dry-Clutches." Machines 9, no. 9 (2021): 185. http://dx.doi.org/10.3390/machines9090185.

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The temperature rise of the engaging clutch during shifting depends heavily on the transmitted torque. Precisely estimating the clutch temperature not only improves clutch control but also the optimal design of the clutch. However, the contact surface of the friction lining is closed, and the surface temperature is often difficult to measure accurately. In this study, a theoretical model of a two-dimensional transient temperature field for the friction disc has been established. In the radial and axial directions under different launching conditions, the temperature field of a friction disc is

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8

Hu, Yusheng, Rongting Zhang, Jinquan Zhang, Qifeng Song, and Guangxiong Chen. "Friction-Excited Oscillation of Air Conditioner Rotary Compressors: Measurements and Numerical Simulations." Lubricants 10, no. 4 (2022): 50. http://dx.doi.org/10.3390/lubricants10040050.

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The oscillation of a rotary compressor was measured and analyzed in the frequency and time domains. The harmonic wavelet transform was used to dissolve the oscillation signal into a series of single-frequency components. A power spectrum analysis of the single-frequency components shows that there are many vibration components whose frequencies are one, double, triple, quadruple, and even tens of times the rotating frequency. An envelope spectrum analysis shows that some single-frequency components originate from the friction-excited oscillation of the compressor. A full-size mode-coupling mod

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9

Irawan, Yudy Surya, Moch Agus Choiron, and Wahyono Suprapto. "Tensile strength and thermal cycle analysis of AA6061 friction weld joints with different diameters and various friction times." Eastern-European Journal of Enterprise Technologies 2, no. 12 (110) (2021): 15–21. http://dx.doi.org/10.15587/1729-4061.2021.227224.

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The paper reports measurement of tensile strength and the thermal cycle of AA6061 aluminum alloy circular bar friction weld with different diameters and various friction times. A continuous drive friction welding (CDFW) of AA6061 was conducted to weld the AA6061 circular bar with different diameters of 30 mm for the rotating part and 15 mm for the stationary part. The CDFW process was carried out with the revolution speed of 1,600 rpm, the initial compressive force of 2.8 kN during the friction stage for various friction times of 10, 12, and 14 seconds, and an upset force of 28 kN for 60 secon

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10

Chen, Chao, and Chongmin She. "Creep Effect Analysis at the Friction Interface of a Rotary Ultrasonic Motor." International Journal of Applied Mechanics 07, no. 02 (2015): 1550031. http://dx.doi.org/10.1142/s1758825115500313.

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Theoretical and experimental studies for the creep mechanism at the friction interface between rotor and stator of traveling wave type rotary ultrasonic motors (TRUM) are performed in this work. A modeling method is developed to investigate the creep and the distributed contact pressure in the friction interface for the piezoelectric composite stator with complex geometries. The annular laminated structure of the stator is discretized into a semi-analytical plate element in the radial direction, and the teeth on top of the stator are modeled by the finite element (FE) method. Then a coupled ap

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11

Wang, Xudong, Zhaofeng Wang, and Man Yao. "Online Measurement for Transient Mold Friction Based on the Hydraulic Oscillators of Continuous-Casting Mold." Metallurgical and Materials Transactions B 44, no. 6 (2013): 1499–508. http://dx.doi.org/10.1007/s11663-013-9919-4.

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12

Keong, Le-Onn, and Choe-Yung Teoh. "Topology Analysis of Bicycle Rim Brake Pad to Improve Braking Performance." MATEC Web of Conferences 217 (2018): 04004. http://dx.doi.org/10.1051/matecconf/201821704004.

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Various parameters of rubber brake pad tribology will affect the braking performance of a rim brake system of a bicycle. Out of those, three main parameters are contact length of brake pad, surface topology of friction surface, and the thickness of rim brake pad. the goals of this study are to improve the braking performance of rim brakes to have better friction performance while retaining its simplicity of manufacturing and to investigate the effect on friction performance through the modifications of external dimensions and surface topology of rim brakes. Moreover, through this study, it can

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13

Ma, Kuikui. "Field Measurement and Mechanism Analysis of Rail Corrugation on Steel Spring Floating Slab Track Section." Sustainability 14, no. 18 (2022): 11790. http://dx.doi.org/10.3390/su141811790.

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In this study, a combination method of field measurements and numerical simulations is used to investigate the mechanism of rail corrugation in the curve’s inner rail in urban rail transit. Firstly, field measurements on rail corrugation and rail vibration characteristics were conducted on the steel spring floating slab track (SSFST) section of a metro line; secondly, a three-dimensional finite element model of the wheelset-SSFST was established, and complex eigenvalue analysis and transient analysis were conducted. It was found that the main frequency of measured rail vertical vibration and t

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14

Skadsem, Hans Joakim, Amare Leulseged, and Eric Cayeux. "Measurement of Drilling Fluid Rheology and Modeling of Thixotropic Behavior." Applied Rheology 29, no. 1 (2019): 1–11. http://dx.doi.org/10.1515/arh-2019-0001.

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Abstract Drilling fluids perform a number of important functions during a drilling operation, including that of lifting drilled cuttings to the surface and balancing formation pressures. Drilling fluids are usually designed to be structured fluids exhibiting shear thinning and yield stress behavior, and most drilling fluids also exhibit thixotropy. Accurate modeling of drilling fluid rheology is necessary for predicting friction pressure losses in the wellbore while circulating, the pump pressure needed to resume circulation after a static period, and how the fluid rheology evolves with time w

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15

Stąsiek, Jan, Adam Stąsiek, and Marek Szkodo. "Modeling of Passive and Forced Convection Heat Transfer in Channels with Rib Turbulators." Energies 14, no. 21 (2021): 7059. http://dx.doi.org/10.3390/en14217059.

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The main goal of the research presented in this paper was the experimental and numerical analysis of heat enhancement and aerodynamic phenomena during air flow in a channel equipped with flow turbulators in the form of properly configured ribs. The use of ribs intensifies the heat transfer and at the same time increases not only the flow resistance but also the energy costs. Therefore, designing modern heat exchangers with optimal thermal and flow parameters requires the knowledge of the theory of heat exchangers as well as measurement methods and numerical calculations. Bearing in mind the ab

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16

Chen, Wei, Yuelin Shen, Rongbing Chen, Zhengxin Zhang, and Sheldon Andre Rawlins. "Simulating Drillstring Dynamics Motion and Post-Buckling State with Advanced Transient Dynamics Model." SPE Drilling & Completion 36, no. 03 (2021): 613–27. http://dx.doi.org/10.2118/199557-pa.

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Summary As drilling sections become deeper and longer, transferring more weight downhole to improve rate of penetration is the primary concern for the operator. Drillstring dynamics and buckling are some primary limiters for drilling efficiency. Aggressive drilling parameters may lead to severe downhole dynamics, which leads to cutter breakage and tool damage. When axial compression exceeds a certain threshold, the drillstring buckles sinusoidally inside the wellbore first, followed by helical buckling. Buckling leads to accelerated joint wear, tool fatigue failures, and lower drilling efficie

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17

Kamaludin, Khairun Najmi, Lokman Abdullah, Syed Najib Syed Salim, et al. "TRIPLE NONLINEAR HYPERBOLIC PID WITH STATIC FRICTION COMPENSATION FOR PRECISE POSITIONING OF A SERVO PNEUMATIC ACTUATOR." IIUM Engineering Journal 24, no. 2 (2023): 315–36. http://dx.doi.org/10.31436/iiumej.v24i2.2766.

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Accurate and precise positioning control is critical in designing a positioning servo pneumatic system. The internal friction force of the pneumatic is one of the disturbances that make it challenging to achieve accurate and precise positioning. Dynamic friction identification and modelling are usually very complex and computationally exhaustive. In addition, pneumatic actuators are nonlinear systems, and applying linear control to the system is a mismatch. This study proposes an enhanced triple nonlinear hyperbolic PID controller with static friction (T-NPID+FSS) feedback module. T-NPID is in

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18

Tu, Jay F., and Jeffrey L. Stein. "On-Line Preload Monitoring for Anti-Friction Spindle Beatings of High-Speed Machine Tools." Journal of Dynamic Systems, Measurement, and Control 117, no. 1 (1995): 43–53. http://dx.doi.org/10.1115/1.2798522.

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Catastrophic and premature bearing failure caused by excessive thermally-induced bearing preload is a major design problem for spindle bearings in high-speed machine tools. Due to a lack of low cost and easy to maintain on-line preload measuring techniques, the traditional solution is to limit the maximum spindle speed and the initial bearing preload. This solution is incompatible with the trend of high-speed machining, which requires increasing both spindle speed and spindle stiffness. Therefore, it would be valuable if thermally-induced preload can be monitored on-line for regulating bearing

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19

Ji, Jiandu, Rongjing Hong, Fuzhong Sun, and Xiaodiao Huang. "Thermal characteristic analysis of Z-axis guideway based on thermal contact resistance." Advances in Mechanical Engineering 10, no. 10 (2018): 168781401880532. http://dx.doi.org/10.1177/1687814018805321.

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The Z-axis feeding system of large computer numerical control (CNC) gear grinding machine tools generates lots of heat during processing, which leads to tilt and pitch deformation of the Z-axis guideway and reduces the machining accuracy. In view of this situation, a three-dimensional finite element analysis method is proposed to conduct transient thermal-structural coupling analysis of the Z-axis guideway and feeding system. Considering the microscopic contact state on machine tool joint surfaces and using the root mean square measurement method, the fractal parameter is identified and the th

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20

Zhao, Wenping, and Przemyslaw Zagrodzki. "Study of Wet Friction Material Test Under Severe Thermal and Mechanical Loading (“Bump Test”)." Journal of Tribology 123, no. 1 (2000): 224–29. http://dx.doi.org/10.1115/1.1331056.

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One of the fatigue tests used for friction materials is the so called “bump test”. In this test, one of the reaction disks in a pack of disks has machined bumps across the contact surface. These bumps generate locally high contact pressure and temperature. In this way, severe contact conditions like that arising in service can be reproduced. The major difficulty in utilizing the “bump test” is estimation of the local pressure and temperature. In this paper, a model is developed and experimental verification of thermoelastic contact is presented. The model represents a multi-surface contact pro

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21

Krasnov, M. L., P. L. Kachurin, S. G. Vishnyakov, et al. "SELF-OSCILLATION OF THE TENSION STATIONS OF AN ETCHING UNIT COMBINED WITH THE TANDEM COLD-ROLLING MILL 2000." Bulletin of the South Ural State University series "Mechanical engineering industry" 23, no. 2 (2023): 61–71. http://dx.doi.org/10.14529/engin230206.

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On multi-cage cold rolling mills combined with a continuous etching unit, self-oscillations can occur not only on the mill stands but also on the tensioning stations of the etching unit. Fatigue cracks can appear on the rollers of the tension stations, and characteristic defects can appear on the surface of the polyurethane-coated roller. To measure self-oscillations, MEMS accelerometers are installed on the roller bearing supports. The collection of vibrational data takes place in parallel with the measurement of technological parameters. Time series databases are used for data storage. The h

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22

Antipov, A. S., and S. A. Krasnova. "Stabilization System of Convey-Crane Position Via Sigmoidal Function." Mekhatronika, Avtomatizatsiya, Upravlenie 20, no. 10 (2019): 609–14. http://dx.doi.org/10.17587/mau.20.609-614.

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In this paper, we consider the convey-crane system, which can transport loads for industrial purposes. The mathematical model, describing the motion of convey-crane, is presented by a Lagrangian mechanical system of nonlinear equations with two degrees of freedom and one control action. It is supposed that the rope has no mass, its stiffness is not taken into account, and there is no friction in the joints. The stabilization problem of the desired convey-crane position is posed underuncertain mass inertia characteristics, an action of non-smooth bounded disturbances and incomplete measurements

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23

Koch, Sebastian, Holger Gödecker, and Utz von Wagner. "On the interrelation of equilibrium positions and work of friction forces on brake squeal." Archive of Applied Mechanics 92, no. 3 (2021): 771–84. http://dx.doi.org/10.1007/s00419-021-02071-4.

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AbstractBrake noise, in particular brake squeal, is a permanent topic both in industry and academia since decades. Nonlinearities play a decisive role for this phenomenon. One nonlinear effect widely ignored so far is that the brake can engage multiple equilibrium positions with severe consequences on the noise behavior. In fact in an automotive disk brake, the essential elements carrier, caliper and pad are elastically coupled with each other and their behavior is nonlinear that multiple equilibrium positions are possible. The engaged equilibrium position depends, for example, on the initial

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Prashu, Raj Nandkeolyar, Premful Kumar, Vivek Kumar Sinha, and Vivek Sangwan. "Entropy Generation and Regression Analysis of Magnetohydrodynamic Stagnation Point Flow of a Casson Fluid with Radiative and Dissipative Heat Transfer and Hall Effects." Mathematical Problems in Engineering 2023 (January 19, 2023): 1–17. http://dx.doi.org/10.1155/2023/8154625.

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The phenomenon of heat transfer is prevalent in industries and has an extensive range of applications. However, mostly the discussion of heat transfer problems is limited to the study of the first law of thermodynamics, which deals with energy conservation. It is just restricted to the quantity of energy, not to its quality; i.e., there is no difference between the work (high-grade energy) and the heat (low-grade energy). A measurement of the degree of randomness of energy in a system is known as entropy. It is unavailable for doing useful work because work takes place only from ordered molecu

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25

Tal, Yuval, Vito Rubino, Ares J. Rosakis, and Nadia Lapusta. "Illuminating the physics of dynamic friction through laboratory earthquakes on thrust faults." Proceedings of the National Academy of Sciences 117, no. 35 (2020): 21095–100. http://dx.doi.org/10.1073/pnas.2004590117.

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Large, destructive earthquakes often propagate along thrust faults including megathrusts. The asymmetric interaction of thrust earthquake ruptures with the free surface leads to sudden variations in fault-normal stress, which affect fault friction. Here, we present full-field experimental measurements of displacements, particle velocities, and stresses that characterize the rupture interaction with the free surface, including the large normal stress reductions. We take advantage of these measurements to investigate the dependence of dynamic friction on transient changes in normal stress, demon

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26

Nygaard, Gerhard Haukenes, Erlend H. Vefring, Kjell Kåre Fjelde, Geir Naevdal, Rolf Johan Lorentzen, and Saba Mylvaganam. "Bottomhole Pressure Control During Drilling Operations in Gas-Dominant Wells." SPE Journal 12, no. 01 (2007): 49–61. http://dx.doi.org/10.2118/91578-pa.

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Summary To obtain an underbalanced pressure condition, nitrogen gas can be injected into the drillstring. Simultaneous injection of liquids and gases leads to a highly dynamic flow system. During pipe connections, pressure transients can cause the bottomhole pressure to rise above the pore pressure of the reservoir or fall below the reservoir collapse pressure. Migration of gas during pipe connection and inflow from the reservoir will also cause bottomhole pressure changes. This paper presents a methodology for controlling the bottomhole pressure during drilling operations in gas-dominant well

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27

Minas, I., N. Morris, S. Theodossiades, M. O’Mahony, and J. Voveris. "Automotive dry clutch fully coupled transient tribodynamics." Nonlinear Dynamics 105, no. 2 (2021): 1213–35. http://dx.doi.org/10.1007/s11071-021-06605-x.

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AbstractDetermining the root causes of Noise, Vibration and Harshness (NVH) phenomena in modern automotive drivetrains is a task of critical importance. This research investigates the stability of dry clutch systems vibrational behaviour during engagement. A fully coupled dry clutch numerical model including the influence of friction is presented and validated using vehicle measurements. The clutch component frictional properties are measured using parts that exhibit aggressive NVH behaviour using representative tribometric experiments. The validated numerical tool highlights the occurrence of

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28

Xizhi, Ma, and Wang Gang. "Study on temperature rise in the screw pair under high frequent oscillation." Industrial Lubrication and Tribology 68, no. 2 (2016): 197–205. http://dx.doi.org/10.1108/ilt-07-2015-0102.

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Purpose – This paper aims to study the mechanism of heat generation in a screw, and investigates the heat flux in the connection screw pair under high frequent oscillation along the axial direction. Heat generated in the screw under high frequent oscillation could be observed in a lot of situations and was significant, and it could cause damage of screw joining and transmission. Design/methodology/approach – A heat flux model in a screw pair under high frequent oscillation along the axial direction is established. Bulk temperature field in the connected parts is calculated by means of finite e

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29

Price, G. R., R. K. McBrien, S. N. Rizopoulos, and H. Golshan. "Evaluating the Effective Friction Factor and Overall Heat Transfer Coefficient During Unsteady Pipeline Operation." Journal of Offshore Mechanics and Arctic Engineering 121, no. 2 (1999): 131–36. http://dx.doi.org/10.1115/1.2830078.

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This paper presents a method to determine the effective friction factor and overall heat transfer coefficient for a high-pressure, natural gas pipeline during fully transient flow conditions. Time-varying SCADA (supervisory control and data acquisition) measurements at the pipeline boundaries (i.e., inlet and outlet) provide boundary conditions for a transient flow model, as well as additional information which is utilized to determine these parameters. The resulting friction factor and overall heat transfer coefficient minimize the least-squared difference between the additional SCADA measure

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30

Polycarpou, Andreas A., and Andres Soom. "Boundary and Mixed Friction in the Presence of Dynamic Normal Loads: Part II—Friction Transients." Journal of Tribology 117, no. 2 (1995): 261–66. http://dx.doi.org/10.1115/1.2831240.

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The normal dynamic model of the sliding system developed in Part I of this paper is combined with a friction model, obtained separately from the same apparatus, to provide estimates of the friction under dynamic loading conditions. The two-dimensional friction model, developed from measurements at constant normal load and slowly varying sliding speeds, includes the normal approach of the sliding bodies as a key variable. From the combined model, estimates of friction under harmonic loading and of friction transients associated with short duration impacts are compared with measurements. The ver

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31

Rubino, Vito, Yuval Tal, Ares J. Rosakis, and Nadia Lapusta. "Evolution of dynamic shear strength of frictional interfaces during rapid normal stress variations." EPJ Web of Conferences 250 (2021): 01016. http://dx.doi.org/10.1051/epjconf/202125001016.

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Pressure shear plate impact tests have revealed that when normal stress changes rapidly enough, the frictional shear resistance is no longer proportional to the normal stress but rather evolves with slip gradually. Motivated by these findings, we focus on characterizing the dynamic shear strength of frictional interfaces subject to rapid variations in normal stress. To study this problem, we use laboratory experiments featuring dynamic shear cracks interacting with a free surface and resulting in pronounced and rapid normal stress variations. As dynamic cracks tend to propagate close to the wa

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32

Chen, W., R. Mills, and R. S. Dwyer-Joyce. "Direct load monitoring of rolling bearing contacts using ultrasonic time of flight." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 471, no. 2180 (2015): 20150103. http://dx.doi.org/10.1098/rspa.2015.0103.

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The load applied by each rolling element on a bearing raceway controls friction, wear and service life. It is possible to infer bearing load from load cells or strain gauges on the shaft or bearing housing. However, this is not always simply and uniquely related to the real load transmitted by rolling elements directly to the raceway. Firstly, the load sharing between rolling elements in the raceway is statically indeterminate, and secondly, in a machine with non-steady loading, the load path is complex and highly transient being subject to the dynamic behaviour of the transmission system. Thi

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33

Watton, J. "The Dynamic Performance of an Electrohydraulic Servovalve/Motor System With Transmission Line Effects." Journal of Dynamic Systems, Measurement, and Control 109, no. 1 (1987): 14–18. http://dx.doi.org/10.1115/1.3143811.

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The transient response of an electrohydraulic servovalve coupled to an axial piston ball motor is analyzed. In particular, the effect of long lines between the servovalve and motor is studied together with coulomb friction effects at the motor. The dynamic characteristics of the basic system with short lines is first established via frequency response measurements coupled with a small signal linearized analysis. Longer lines are then added and the method of characteristics, coupled with a quasi-analytical solution for the motor-end equations, is used to predict the large signal transient respo

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34

Gassenfeit, E. H., and A. Soom. "Friction Coefficients Measured at Lubricated Planar Contacts During Start-Up." Journal of Tribology 110, no. 3 (1988): 533–38. http://dx.doi.org/10.1115/1.3261670.

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Measurements of instantaneous coefficients of friction and associated motions during start-up at a planar contact are presented for four different lubrication conditions. The various patterns of transient behavior are discussed. Difficulties in interpreting static friction coefficients during rapidly applied tangential loads are described in relation to the motion data. It is shown that a molybdenum disulphide grease yields a friction characteristic that is quite different from either dry or boundary lubricated conditions in the presence of liquid lubricants. Transition distances from a static

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35

Taniguchi, Koichi, Yong Chae Lim, Alexis Flores-Betancourt, and Zhili Feng. "Transient Microstructure Evolutions and Local Properties of Dual-Phase 980 MPa Grade Steel Via Friction Stir Spot Processing." Materials 13, no. 19 (2020): 4406. http://dx.doi.org/10.3390/ma13194406.

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Friction stir processing is a novel solid-state process to modify microstructures and their properties by intense, localized plastic deformation. However, little research has been reported for microstructure evolutions of advanced high-strength steels during the process. The present work focuses on the study of transient microstructure changes and local mechanical properties for friction stir spot processed dual-phase (DP) 980 MPa grade steel (DP980) under different peak temperatures. A pinless silicon nitride ceramic tool was used to produce relatively simple material deformation and flow nea

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36

Fan, D., and A. Tijsseling. "Fluid-Structure Interaction With Cavitation in Transient Pipe Flows." Journal of Fluids Engineering 114, no. 2 (1992): 268–74. http://dx.doi.org/10.1115/1.2910026.

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The interactions between axial wave propagation and transient cavitation in a closed pipe are studied. Definitive experimental results of the phenomenon are produced in a novel apparatus. The apparatus is characterized by its simplicity and its capability of studying transient phenomena in a predictable sequence. The influence due to friction is small and the representations of the boundary conditions are straightforward. Measurements with different severity of cavitation are provided to enable other researchers in the area to compare with their theoretical models. A new cavitating fluid/struc

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37

Grolman, Eric, and Jan M. H. Fortuin. "Transient Gas-Liquid Flow in Upward Sloping Pipes, Approaching the Wavy-to-Slug Flow Transition." Journal of Fluids Engineering 118, no. 4 (1996): 729–35. http://dx.doi.org/10.1115/1.2835502.

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A model is presented for transient, cocurrent gas-liquid pipe flow in the stratified-smooth and stratified-wavy flow regimes. It is based on the equations of continuity and motion in the direction of flow and results in two hyperbolic partial differential equations, which are solved numerically using the combined methods of lines (Schiesser, 1991) and characteristics (Stoker, 1957). In wavy gas-liquid pipe flow, three different interfacial areas and corresponding shear stresses are identified. Three friction-factor correlations were derived on the basis of an extensive set of 2500 steady-state

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Kucinschi, B., and M. Fillon. "An Experimental Study of Transient Thermal Effects in a Plain Journal Bearing." Journal of Tribology 121, no. 2 (1999): 327–32. http://dx.doi.org/10.1115/1.2833940.

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The present study deals with the experimental determination of temperature distribution in a plain, steadily loaded journal bearing, during transient thermal periods such as start-up or slow changing in velocity. A number of chromel-alumel thermocouples, placed circumferentially in the median section of the bearing, are used in order to carry out the measurements. The temperature at film-shaft interface is also measured by means of a chromel-alumel thermocouple and a mercury transmitter. The effects of journal speed and load on bearing temperature and fluid friction torque are analyzed. The be

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Slabka, Iryna, Sören Henniger, David Kücükkaya, Michael Dawoud, and Hubert Schwarze. "Influence of Rheological Properties of Lithium Greases on Operating Behavior in Oscillating Rolling Bearings at a Small Swivel Angle." Lubricants 10, no. 7 (2022): 163. http://dx.doi.org/10.3390/lubricants10070163.

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In this study, the behavior of greases during oscillating bearing operation with a small oscillation angle and high frequency was investigated. This mode of operation entails demands on the lubrication system that differ significantly from those for continuously rotating bearings. In order to determine the variables influencing the suitability of a lubricating grease for small angle oscillating operation, the grease samples were examined with particular regard to their rheological properties. The focus of this investigation was to find a relationship between the rheological parameters and the

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McNelley, Terry R., Keiichiro Oh-ishi, and Alexandre P. Zhilyaev. "Microstructure Evolution and Microstructure-Property Relationships in Friction Stir Processing of NiAl Bronze." Materials Science Forum 539-543 (March 2007): 3745–50. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.3745.

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Friction stir processing (FSP) has been employed for localized modification and control of microstructures in NiAl bronze materials, which are widely utilized for marine components. The thermomechanical cycle of FSP results in homogenization and refinement and the conversion of microstructures from a cast to a wrought condition within stir zones in the material. However, the direct measurement of stir zone temperatures, strains, strain rates and cooling rates is difficult due to steep gradients and transients in these quantities, and this is an impediment in the assessment of FSP-induced micro

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Fares, Y. R. "Transient bottom topography changes in alluvial streams." Canadian Journal of Civil Engineering 27, no. 2 (2000): 309–18. http://dx.doi.org/10.1139/l99-063.

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The development of a quasi two-dimensional computational model for simulating the transient variations of bed topography profiles in alluvial river channels is reported. The formulation of the model is based on combining the longitudinal flow momentum with the continuity principle of the sediment bed load. The Engelund-Hansen formula is employed in estimating the total sediment bed load along the reach of a river channel. The lateral bed load contribution from the total load is calculated in the same way as in calculating the lateral secondary currents from the main flow velocities. The numeri

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Potdar, Yogesh K., and Alan T. Zehnder. "Measurements and Simulations of Temperature and Deformation Fields in Transient Metal Cutting." Journal of Manufacturing Science and Engineering 125, no. 4 (2003): 645–55. http://dx.doi.org/10.1115/1.1596571.

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Advanced finite element software makes it possible to perform accurate simulations of orthogonal metal cutting provided all input parameters such as material properties, friction and material separation criteria are known. In principle, such properties can be determined by performing a series of cutting experiments and mechanical property tests, and then iterating the finite element simulations until acceptable agreement is reached. Cutting measurements have generally included only cutting forces and tool-chip temperatures. We hypothesize that by closely coupling simulations to conventional cu

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Mishra, P. C., H. Rahnejat, and P. D. King. "Tribology of the ring—bore conjunction subject to a mixed regime of lubrication." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 223, no. 4 (2008): 987–98. http://dx.doi.org/10.1243/09544062jmes1220.

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This paper provides a detailed analysis of the compression ring—bore/liner conjunction. The analysis includes ring—bore conformability and global in-plane deformation of ring fitted in situ. The analysis for fitted ring in an out-of-round bore shows very good agreement with precise measurements, using a coordinate measuring machine. The analysis also includes the lubricated conjunction under a transient regime of lubrication, taking into account combined elastohydrodynamics and asperity interactions. The transient nature of the tribological conjunction has been demonstrated, particularly the p

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Assemien, Modeste, and Alain Le Bot. "Vibration level induced by the friction of two rough surfaces weakly loaded." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 5 (2021): 1261–66. http://dx.doi.org/10.3397/in-2021-1795.

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This paper presents an experiment to measure the vibration level generated when a light solid slides over a dry and rough surface. The experimental set-up is based on linear constant motion with speed range from 1 to 1000 mm/sec. The aim is to study the evolution of the vibration level as a function of the sliding speed and the friction area. Measurements show that the vibration level is a logarithmic increasing function of the sliding speed with a transient velocity. It is also observed that two regimes exist for the evolution of vibration level versus apparent contact area. On the one hand t

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MOSS, E. A., A. KRASSNOKUTSKI, B. W. SKEWS, and R. T. PATON. "Highly transient squeeze-film flows." Journal of Fluid Mechanics 671 (January 25, 2011): 384–98. http://dx.doi.org/10.1017/s0022112010005756.

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The aim of this work was to investigate the flow evolution with time of fluid between two parallel disks and the corresponding pressure variations at the centre of the lower disk that occur subsequent to an impact-loading situation arising from dropping a mass onto the upper disk from a chosen height. During the event a fixed amount of energy is dissipated in the fluid between the disks through the action of friction. Therefore, this fundamental system may be regarded as a constant energy one, as distinct from one in which the upper disk is moving at a constant velocity, or is acted upon by a

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Yao, Bin, and Masayoshi Tomizuka. "Adaptive Robust Motion and Force Tracking Control of Robot Manipulators in Contact With Compliant Surfaces With Unknown Stiffness." Journal of Dynamic Systems, Measurement, and Control 120, no. 2 (1998): 232–40. http://dx.doi.org/10.1115/1.2802414.

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High performance robust motion and force tracking control of robot manipulators in contact with compliant surfaces is considered in this paper. The robot parameters and the stiffness of the contact surface may not be known. The system may also be subjected to uncertain nonlinearities coming from the joint friction of the robot, external disturbances, the contact surface friction model, and the unknown time-varying equilibrium position of the contact surface. An adaptive robust motion and force tracking controller is proposed, which needs measurements of position, velocity, and interaction forc

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Wang, Z., P. T. Ireland, S. T. Kohler, and J. W. Chew. "Heat Transfer Measurements to a Gas Turbine Cooling Passage With Inclined Ribs." Journal of Turbomachinery 120, no. 1 (1998): 63–69. http://dx.doi.org/10.1115/1.2841390.

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The local heat transfer coefficient distribution over all four walls of a large-scale model of a gas turbine cooling passage have been measured in great detail. A new method of determine the heat transfer coefficient to the rib surface has been developed and the contribution of the rib, at 5 percent blockage, to the overall roughened heat transfer coefficient was found to be considerable. The vortex-dominated flow field was interpreted from the detailed form of the measured local heat transfer contours. Computational Fluid Dynamics calculations support this model of the flow and yield friction

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Ramudu, Eshwan, Benjamin Henry Hirsh, Peter Olson, and Anand Gnanadesikan. "Turbulent heat exchange between water and ice at an evolving ice–water interface." Journal of Fluid Mechanics 798 (June 7, 2016): 572–97. http://dx.doi.org/10.1017/jfm.2016.321.

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We conduct laboratory experiments on the time evolution of an ice layer cooled from below and subjected to a turbulent shear flow of warm water from above. Our study is motivated by observations of warm water intrusion into the ocean cavity under Antarctic ice shelves, accelerating the melting of their basal surfaces. The strength of the applied turbulent shear flow in our experiments is represented in terms of its Reynolds number $Re$, which is varied over the range $2.0\times 10^{3}\leqslant Re\leqslant 1.0\times 10^{4}$. Depending on the water temperature, partial transient melting of the i

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Chen, P.-H., and Z.-C. Chang. "Measurements of Thermal Performance of the Regenerator of a Cryocooler with a high Number of Transfer Units Value." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 210, no. 4 (1996): 341–52. http://dx.doi.org/10.1243/pime_proc_1996_210_206_02.

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Hundreds of stacked wire screens are used in the regenerator matrix of a common cryocooler. The number of transfer units of such a matrix (denoted as NTUm) may well exceed 60. However, most of the earlier studies reported are limited to studies of regenerators with NTUm values less than 60, as the single-blow method was employed to measure the NTUm value of the regenerator matrix. Furthermore, in these earlier studies, the effect of heat transfer from the working fluid to the external tube and the Joule-Thomson effect were neglected. In the present study, three regenerators having high NTUm va

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Pleskun, H., A. Syring, and A. Brümmer. "Transient chamber filling in rotary positive displacement vacuum pumps." IOP Conference Series: Materials Science and Engineering 1267, no. 1 (2022): 012016. http://dx.doi.org/10.1088/1757-899x/1267/1/012016.

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Chamber model simulation is a common approach to simulate rotary positive displacement vacuum pumps. Therefore the pump is abstracted into working chambers and connecting clearances, whereby the clearance leakages can be identified as the major loss mechanism in such machines. The clearance mass flow rates are calculated with respect to the thermodynamic states in the adjacent chambers, which are inhomogeneous for rarefied gases due to the movement of the rotors which causes a pressure gradient within the chamber. This effect increases with higher Knudsen numbers, because of the increasingly d

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