SELECTING THE VALUE OF THE STOCK RATIO WHEN SETTING UP SAFETY FRICTION CLUTCHES

2020 ◽  
Author(s):  
S.V Lesniak ◽  
◽  
O.V Lesniak ◽  
D.V Baryshnikov
Keyword(s):  
Coefficient Of Friction ◽  
Probability Of Occurrence ◽  
Average Value ◽  
Minimum Value ◽  
The Coefficient Of Friction ◽  
Nominal Load

It is shown that the coefficient of safety friction clutches is not enough to transfer the nominal load of the machine without slipping in cases when the coefficient of friction decreases to a minimum value. It is established that the existing theory of calculation and design of safety clutches contains an erroneous position that the nominal torque of the machine is constant and does not change in time. This leads to an increase in the probability of occurrence of unmotivated actuations of safety friction clutches with a decrease in the coefficient of friction below the average value.

Influence of the second-generation adaptive friction clutch configuration method (basic version) for its maximum load

2020 ◽  
pp. 552-557
Author(s):  
M.P. Shishkarev
Keyword(s):  
Safety Factor ◽  
Coefficient Of Friction ◽  
Second Generation ◽  
Maximum Load ◽  
Maximum Torque ◽  
Minimum Value ◽  
Average Coefficient ◽  
Friction Clutch ◽  
The Coefficient Of Friction ◽  
Basic Version

It is shown that the maximum torque of adaptive friction clutches of the second generation (baseline) when it is configured with the minimum coefficient of friction less than the setting based on an average coefficient of friction, if a ratio of the coefficient of friction to its minimum value more than the value of the safety factor.

Effect of Hardness and Position on Wear Behavior of Steel Pairs

2012 ◽  
Vol 263-266 ◽  
pp. 95-98
Author(s):  
Zhu Jun Li ◽  
Zheng Wu Jiang ◽  
Huan Wei Zhou
Keyword(s):  
Friction Coefficient ◽  
Coefficient Of Friction ◽  
Room Temperature ◽  
Wear Behavior ◽  
Friction Pair ◽  
Wear Volume ◽  
Average Value ◽  
Small Impact ◽  
Test Conditions ◽  
The Coefficient Of Friction

In this paper, the effect of hardness and position on the 40CrNiMoA steel and 18Cr2Ni4WA steel friction pairs’ friction coefficient and wear volume were studied without lubrication, at room temperature. The results show that: Under test conditions, the fluctuation in the friction coefficient is bigger, when the up specimen is the harder 18Cr2Ni4WA steel. And when the up specimen is the softer 40CrNiMoA steel, the fluctuation in the friction coefficient is relatively small. When the up specimen is the 40CrNiMoA steel, the hardness of 40CrNiMoA steel is a relatively small impact on the average value of the coefficient of friction.When the up specimen is the softer 40CrNiMoA steel, the coefficient of friction is relatively larger than that when the up specimen is the harder 18Cr2Ni4WA steel. The wear volumes is relate to the position of friction pair. When the up specimen is the harder 18Cr2Ni4WA steel, both sides of the friction pairs has the same wear volumes when the hardness of 40CrNiMoA steel is about 43HRC. When the up specimen is softer 40CrNiMoA steel, and its hardness is about 54HRC, the wear volumes curves of two materials intersect.

Synthesis and analysis of adaptive friction oupling with negativezero feedback

2020 ◽  
pp. 499-505
Author(s):  
M.P. Shishkarev
Keyword(s):  
Coefficient Of Friction ◽  
Negative Feedback ◽  
Minimum Value ◽  
Maximum Value ◽  
Maximum Accuracy ◽  
The Coefficient Of Friction

It is shown that the maximum accuracy of the adaptive friction coupling with negative-zero feedback is achieved when the torque increases monotonously in the range of changes in the coefficient of friction, the occurrence of a spacer force from the torque of the friction group covered by the negative feedback at the minimum value of the coefficient of friction and the negative feedback is turned off at the maximum value of the coefficient of friction.

PENERAPAN STRATEGI DRTA (DIRECTED READING THINKING ACTIVITY) UNTUK MENINGKATKAN KEMAMPUAN SISWA DALAM MENCARI GAGASAN POKOK KARANGAN NARASI PADA SISWA KELAS IV SDN 003 PAGARAN TAPAH DARUSSALAM

2017 ◽  
Vol 5 (3) ◽  
pp. 42
Author(s):  
Marnius '
Keyword(s):  
Action Research ◽  
Achievement Test ◽  
Class Action ◽  
Narrative Writing ◽  
Research Instrument ◽  
Student Activity ◽  
Average Value ◽  
Minimum Value ◽  
Directed Reading ◽  
Class Iv

This research is motivated by the low ability students in finding ideas principal authorshipnarration in class IV SDN 003 Pagaran Tapah Darussalam. Goals to be achieved in thisresearch is to improve the ability of students in the basic idea for narrative writing in class IVSDN 003 Pagaran Tapah Darussalam through DRTA Strategy (directed reading thinkingactivity) carried out for 1 month. This research was conducted in SDN 003 Pagaran TapahDarussalam. Classes are meticulous researchers are class IV by the number of students asmany as 20 people. The study of this class action commenced in early September 2014. Thisform of research is classroom action research. The research instrument consists ofinstruments teacher and student activity sheets and achievement test. Based on the results ofthe study, the research concluded that the ability to search for the key idea fourth gradestudents of SDN 003 Pagaran Tapah Darussalam can be enhanced through DRTA strategy.This is evident from the increase in the student's ability in finding the key idea of the strategyDRTA before being applied to the second cycle of the second meeting. Known frompreliminary data the average value of students is 63. If the views of classical completeness,there are 30% of students (6) who finished obtaining a minimum value of 65 (according to thestandard KKM), the first cycle the first meeting denganrata average increased to 65, 3%circuitry completeness reach 10 or 50%, while in the second meeting mkembali increased to69.5 by the thoroughness of 12 people or 60% and sikluy II first meeting back in an averageincrease of 75% with the thoroughness of 16 or 80% and increased again in meetings second,reaching 80.5% with 100% completeness. The overall ability of students increased from theinitial tests until the fourth meeting of (20%). Thus, this study was successful

Experimental Investigation of aluminum doping crumb rubber/epoxy composite in reciprocating motion

2015 ◽  
Vol 3 ◽  
pp. 1
Author(s):  
Goutam Chandra Karar ◽  
Nipu Modak
Keyword(s):  
Experimental Investigation ◽  
Coefficient Of Friction ◽  
Epoxy Composite ◽  
Normal Load ◽  
Crumb Rubber ◽  
The Other ◽  
Reciprocating Motion ◽  
Molding Process ◽  
Friction Tester ◽  
The Coefficient Of Friction

The experimental investigation of reciprocating motion between the aluminum doped crumb rubber /epoxy composite and the steel ball has been carried out under Reciprocating Friction Tester, TR-282 to study the wear and coefficient of frictions using different normal loads (0.4Kg, 0.7Kgand1Kg), differentfrequencies (10Hz, 25Hz and 40Hz).The wear is a function of normal load, reciprocating frequency, reciprocating duration and the composition of the material. The percentage of aluminum presents in the composite changesbut the other components remain the same.The four types of composites are fabricated by compression molding process having 0%, 10%, 20% and 30% Al. The effect of different parameters such as normal load, reciprocating frequency and percentage of aluminum has been studied. It is observed that the wear and coefficient of friction is influenced by the parameters. The tendency of wear goes on decreasing with the increase of normal load and it is minimum for a composite having 10%aluminum at a normal load of 0.7Kg and then goes on increasing at higher loads for all types of composite due to the adhesive nature of the composite. The coefficient of friction goes on decreasing with increasing normal loads due to the formation of thin film as an effect of heat generation with normal load.

scholarly journals Tribological Aspects, Optimization and Analysis of Cu-B-CrC Composites Fabricated by Powder Metallurgy

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4217
Author(s):  
Üsame Ali Usca ◽  
Mahir Uzun ◽  
Mustafa Kuntoğlu ◽  
Serhat Şap ◽  
Khaled Giasin ◽  
...  
Keyword(s):  
Weight Loss ◽  
Wear Rate ◽  
Coefficient Of Friction ◽  
Applied Load ◽  
Practical Significance ◽  
Tribological Characteristics ◽  
M 10 ◽  
Wide Range ◽  
The Coefficient Of Friction ◽  
Four Levels

Tribological properties of engineering components are a key issue due to their effect on the operational performance factors such as wear, surface characteristics, service life and in situ behavior. Thus, for better component quality, process parameters have major importance, especially for metal matrix composites (MMCs), which are a special class of materials used in a wide range of engineering applications including but not limited to structural, automotive and aeronautics. This paper deals with the tribological behavior of Cu-B-CrC composites (Cu-main matrix, B-CrC-reinforcement by 0, 2.5, 5 and 7.5 wt.%). The tribological characteristics investigated in this study are the coefficient of friction, wear rate and weight loss. For this purpose, four levels of sliding distance (1000, 1500, 2000 and 2500 m) and four levels of applied load (10, 15, 20 and 25 N) were used. In addition, two levels of sliding velocity (1 and 1.5 m/s), two levels of sintering time (1 and 2 h) and two sintering temperatures (1000 and 1050 °C) were used. Taguchi’s L16 orthogonal array was used to statistically analyze the aforementioned input parameters and to determine their best levels which give the desired values for the analyzed tribological characteristics. The results were analyzed by statistical analysis, optimization and 3D surface plots. Accordingly, it was determined that the most effective factor for wear rate, weight loss and friction coefficients is the contribution rate. According to signal-to-noise ratios, optimum solutions can be sorted as: the highest levels of parameters except for applied load and reinforcement ratio (2500 m, 10 N, 1.5 m/s, 2 h, 1050 °C and 0 wt.%) for wear rate, certain levels of all parameters (1000 m, 10 N, 1.5 m/s, 2 h, 1050 °C and 2.5 wt.%) for weight loss and 1000 m, 15 N, 1 m/s, 1 h, 1000 °C and 0 wt.% for the coefficient of friction. The comprehensive analysis of findings has practical significance and provides valuable information for a composite material from the production phase to the actual working conditions.

scholarly journals Influence of Beam Power on Young’s Modulus and Friction Coefficient of Ti–Ta Alloys Formed by Electron-Beam Surface Alloying

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1246
Author(s):  
Stefan Valkov ◽  
Dimitar Dechev ◽  
Nikolay Ivanov ◽  
Ruslan Bezdushnyi ◽  
Maria Ormanova ◽  
...  
Keyword(s):  
Electron Beam ◽  
Young’S Modulus ◽  
Coefficient Of Friction ◽  
Young's Modulus ◽  
Beam Power ◽  
Surface Alloying ◽  
Surface Alloys ◽  
X Ray ◽  
The Coefficient Of Friction ◽  
Beam Surface

In this study, we present the results of Young’s modulus and coefficient of friction (COF) of Ti–Ta surface alloys formed by electron-beam surface alloying by a scanning electron beam. Ta films were deposited on the top of Ti substrates, and the specimens were then electron-beam surface alloyed, where the beam power was varied from 750 to 1750 W. The structure of the samples was characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). Young’s modulus was studied by a nanoindentation test. The coefficient of friction was studied by a micromechanical wear experiment. It was found that at 750 W, the Ta film remained undissolved on the top of the Ti, and no alloyed zone was observed. By an increase in the beam power to 1250 and 1750 W, a distinguished alloyed zone is formed, where it is much thicker in the case of 1750 W. The structure of the obtained surface alloys is in the form of double-phase α’and β. In both surface alloys formed by a beam power of 1250 and 1750 W, respectively, Young’s modulus decreases about two times due to different reasons: in the case of alloying by 1250 W, the observed drop is attributed to the larger amount of the β phase, while at 1750 W is it due to the weaker binding forces between the atoms. The results obtained for the COF show that the formation of the Ti–Ta surface alloy on the top of Ti substrate leads to a decrease in the coefficient of friction, where the effect is more pronounced in the case of the formation of Ti–Ta surface alloys by a beam power of 1250 W.

Reducing the Coefficient of Friction for Fast-Absorbing Gut Suture

2009 ◽  
Vol 35 (12) ◽  
pp. 2004 ◽  
Author(s):  
Jonathan Lee Bingham ◽  
Mariah R. Brown ◽  
Julian Ramsey Mellette
Keyword(s):  
Coefficient Of Friction ◽  
The Coefficient Of Friction

First Paper: Effect of Under-Lip Temperature on the Lubrication of Rotary Shaft Garter Spring Seals

1966 ◽  
Vol 181 (1) ◽  
pp. 185-190 ◽  
Author(s):  
D. J. Lines ◽  
J. M. Lawrie ◽  
J. P. O'Donoghue
Keyword(s):  
Coefficient Of Friction ◽  
Operating Temperature ◽  
Lubrication Theory ◽  
Fluid Film ◽  
Hydrodynamic Parameter ◽  
Accurate Knowledge ◽  
The Coefficient Of Friction ◽  
Surface Thermocouple ◽  
Sealing Mechanism ◽  
Film Lubrication

Although rotary shaft garter spring seals are widely used throughout industry, very little is known about the sealing mechanism of the lip-shaft interface. It is now generally accepted that some sort of fluid film separates the lip and the shaft. Previous workers have also postulated a relationship between the coefficient of friction and a non-dimensional hydrodynamic parameter, as in standard lubrication theory. This present paper clarifies this relationship, and shows that seals can also operate over the mixed friction, as well as the full film lubrication region. The results were obtained by accurate knowledge of the operating temperature under the sealing lip. Two types of surface thermocouple were developed to do this and these are described in full.

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