Friction, Wear, Lubrication

Ludema, Kenneth C.

doi:10.1201/9781439821893

Cited by 245 publications

(109 citation statements)

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“…The coefficients depend on bearing materials, operation conditions, environmental external influences, and vibration influences. Therefore, the assumption and knowledge of materials, exploitation conditions and finally external influences enable us to determine the control of wear during the operation time [3,4]. The results obtained in this paper show how to anticipate wear of a slide bearing after many time units of the operation if bearing materials, exploitation and environmental conditions are known.…”

Section: Preliminariesmentioning

confidence: 90%

“…. and for mentioned wear values we assign the respective wear processes described by the following three recurrent equations [1][2][3][4][5][6][7][8]:…”

Section: The Object Of the Problemmentioning

confidence: 99%

“…The problems referring to the experimental and numerical wear of slide bearing exploitation questions require the knowledge of information about the features of the sequence of the existing wear process during the operation time [1][2][3][4]. The abovementioned information includes especially the kind and velocity of the wear value increases during the particular time units of the operation and very important are convergence and divergence phenomena of the wear value increases.…”

Section: Preliminariesmentioning

confidence: 99%

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Control contribution for wear bearing recurrence process

Wierzcholski¹,

Miszczak²

2014

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. This paper presents the methods of control problem solutions using recurrence equations implementation and UOS transformation for the bearing wear estimation during the finite and infinite time units of an operation process. If we have two wear value increase processes then very important is information which process is divergent more slowly. On the other hand, in comparison with two convergent processes we must decide which process is convergent more quickly. The wear process is determined mostly by the summation factor method. Such a method is applied for the solutions of recurrence equations with variable coefficients.Key words: recurrences equations, wear bearing control process. PreliminariesThe problems referring to the experimental and numerical wear of slide bearing exploitation questions require the knowledge of information about the features of the sequence of the existing wear process during the operation time [1][2][3][4]. The abovementioned information includes especially the kind and velocity of the wear value increases during the particular time units of the operation and very important are convergence and divergence phenomena of the wear value increases. If we have two wear value divergent processes, then very important is information which process is divergent more slowly. On the other hand, in comparison with two convergent processes, we must decide which process is convergent more quickly. This paper allows us to consider such a problem. If the wear value process in particular time units of the operating time is decreasing to some wear limit values, then it is possible to obtain the wear bearing stabilization in sufficient many time units of the operation. If the wear value process in particular time units of the operating time is increasing, then we have the phenomenon of wear bearing continuous increments in sufficient many time units of the operation. In both cases mentioned above, the sum of wear values after the considered time units of the operation, i.e. the cumulative function of wear values can be divergent. The most important for practical needs is the convergence or divergence of the cumulative values of bearing wear after the considered time units of the operation. To perform investigations of the abovementioned control problems, the wear value processes are described by non-homogeneous recurrent equations with a variable free term. The results obtained in this paper show that convergence or divergence of the wear processes depends on experimentally determined coefficients which occur in the considered wear recurrent equations. The coefficients depend on bearing materials, operation conditions, environmental external influences, and vibration influences. Therefore, the assumption and knowledge of materials, exploitation conditions and finally external influences enable us to determine the control of wear during the operation time [3,4]. The results obtained in this paper show how to anticipate wear of a slide bearing after many time units of the operation if bearing mater...

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Section: Preliminariesmentioning

confidence: 90%

“…. and for mentioned wear values we assign the respective wear processes described by the following three recurrent equations [1][2][3][4][5][6][7][8]:…”

Section: The Object Of the Problemmentioning

confidence: 99%

Section: Preliminariesmentioning

confidence: 99%

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Control contribution for wear bearing recurrence process

Wierzcholski¹,

Miszczak²

2014

Bulletin of the Polish Academy of Sciences Technical Sciences

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“…Figure 1 shows the wear depth increase versus the succeeding operating times for a constant normal load and various materials of cooperating surfaces, according to the experimental results published according to Bhushan B. and Ludema K.C. [1,2,8]. The effects of severe amplitude vibration on wear, expressed in µm 3 , are elaborated by the Authors on the grounds of the experimental results published by Ludema K.C., Bhushan B., and Kapoor A., Pytko S. [1,2,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Ludema K.C., Bhusha M. and other Authors [1,2,6,8] have made many measurements in the field of wear determination. Such interesting practical achievements are up to now not finally illustrated and elaborated in the simple analytical and numerical expressions [6].…”

Section: Introductionmentioning

confidence: 99%

A Method of the Wear Prognosis of Sliding Bearings

Miszczak¹,

Wierzcholski²

2014

Archive of Mechanical Engineering

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The considerations presented in this paper include a computer analysis of slide bearing wear prognosis using the solutions of recurrence equations complemented with the experimental data values. On the ground of the results obtained from analytical and computational numerical calculations, and taking into account the experimental parameters of bearing material and operation boundary conditions, the control problems of slide bearing wear surfaces have been presented. The obtained results allow us to see a connection between roughness, material properties, the amplitude of vibrations, the kind of the friction forces, the hardness of materials, the sliding speed in one side and the wear increments in succeeding time units of the exploitation process in other side.

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Lubrication and Lubricants

Dickey¹

2005

Kirk-Othmer Encyclopedia of Chemical Technology

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Lubrication is a process in which a lubricant is placed between rubbing surfaces to control friction and reduce wear. This article outlines the nature of the frictional force, the wear process, the role of surface characteristics, and the mechanisms of lubrication. The manufacture and classification of lubricating oil base stocks, including refined petroleum stocks, chemical base stocks, stocks synthesized from other chemicals, and vegetable oils are covered. The composition and function of lube oil additives are described for enhancing oxidation stability, corrosion resistance, wear reduction, friction modifying, viscosity–temperature characteristics, and other important performance characteristics. The performance characteristics of lubricating oils, for selected applications are discussed, including automotive engine oils, diesel engine oils, automatic transmission fluids, automotive gear oils, jet engine lubes, and industrial turbine oils. Metalworking fluids, lubricating grease, solid‐film lubricants, and lubrication in extreme environments are covered, as are the lubricants market and environmental and health concerns.

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Friction, Wear, Lubrication

Cited by 245 publications

References 0 publications

Control contribution for wear bearing recurrence process

Control contribution for wear bearing recurrence process

A Method of the Wear Prognosis of Sliding Bearings

Lubrication and Lubricants

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