On Modelling Techniques for Mechanical Joints: Literature Study

Karlsen, Øyvind; Lemu, Hirpa G.

doi:10.1007/978-981-15-2341-0_15

Cited by 5 publications

(4 citation statements)

References 26 publications

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“…In the recent works of the authors, however, some research results have been reported. For instance, the expanding pin solution, as a part of a mechanical joint, has been compared to other known joint models and modelling techniques, by Karlsen and Lemu [13,14], with focus on the damage mechanisms that can occur in various connections of mechanical systems, typically such as fretting wear, fretting corrosion, and fretting fatigue. In addition, Akhtar et al [15] reported a study on the capacities of a pin with the combination of radially expanding and axially pre-load capabilities, typically for huge flange systems.…”

Section: Literature Reviewmentioning

confidence: 99%

An Investigation of the Effects and Consequences of Combining Expanding Dual Pin with Radial Spherical Plain Bearings

Karlsen

Lemu

Berkani³

2022

Applied Mechanics

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An expanding pin locks the pin assembly to its supports and bearings and prevents any relative movements between the surfaces in contact. In this study, the diameter changes of the bearing inner ring as a function of the expanding pin’s tightening torque were studied. In addition, the required rotational moment of a set of complete bearings locked to an expanding pin solution was studied by exposing the assembly to a combination of an increasing radially outwards directed load from the bolt torquing and a radially external inwards directed load from a hydraulic jack. The bearings were of type Radial Spherical Plain Bearings (RSPBs), GE 80 ES, steel/steel, and loaded externally up to their maximum dynamic limit of 400 kN. The results indicate a major reduction in the required rotation moment of the bearing when the bearing inner ring is expanded by use of an expanding pin. The reduction of rotation moment indicates reduced contact pressure and friction force between the two bearing rings, which ultimately can have a reduced effect on ring surface wear and a positive effect on the bearing operational lifetime.

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Section: Literature Reviewmentioning

confidence: 99%

An Investigation of the Effects and Consequences of Combining Expanding Dual Pin with Radial Spherical Plain Bearings

Karlsen

Lemu

Berkani³

2022

Applied Mechanics

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“…Повышение грузонапряженности ставит перед железнодорожной отраслью задачи, связанные с разработкой и внедрением современных методов и средств диагностики подшипников [4]. Для контроля колец и роликов в вагоноремонтных депо используются магнитопорошковый и вихретоковый [5,6] Рассчитанные методом конечных элементов собственные частоты с достаточно высокой точностью (относительная погрешность не превышает 2 %) соответствуют экспериментально установленным значениям (рис.…”

Section: Introductionunclassified

Investigation of Spectral and Temporal Characteristics of Free Vibrations of Bearing Rings Press Joints for Solving Problems of Non-Destructive Testing

Ryzhova,

Beher

2022

Intellekt. Sist. Proizv.

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To determine the possibility of controll the fit tightness of the press joints of the inner rings of the bearings with the journals of the wheelset axles by the method of free vibrations, experimental studies of the frequency and time patterns of bearing free rings natural vibrations, tuning samples, which are press joints of rings and shafts with interferences from 20 to 90 microns and joints of bearing rings with real axles of wheelsets, received from operation to the mid-life repair in car repair depots. The influence of various boundary conditions on the natural oscillation parameters of the free ring of the bearing has been studied. The natural frequencies of bearing rings in a free state and samples of rings and shafts press joints were experimentally determined. A comparative analysis of theharmonic spectra of their own oscillations was carried out, on the basis of which a criterion for the fit leakeage of the ring to the axle neck of the wheelset was found. The finite element method is used to calculate natural frequencies and the corresponding modes of ring vibrations in a free state and interference samples. A comparative analysis with the experimentally obtained frequencies was carried out. To analyze the patterns of free oscillation damping, the Fourier signal transformation was performed. Their amplitude-frequency-time characteristics were obtained. The spectra of free vibrations were calculated for bearing rings put on the axle journal manually, without interference with the gap between the contact surfaces of the axle and the ring filled with industrial oil and without it, for a press connection with a tight fit and for a weak press fit. A comparative analysis of the obtained spectra was carried out, on the basis of which a method for determining the fit leakeage of the ring to the axle neck was developed.

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“…Repairing damaged supports is time-consuming and involves direct costs in terms of repairs and materials, and indirect costs in unwanted and often unplanned downtime. In general, there are various methods to join the pin shaft and the supports, such as (i) with a standard, cylindrical pin, (ii) interference by press fitting, (iii) interference by shrink fitting, and (iv) interference fit by radially expanding the pin [2,3].…”

Section: Introductionmentioning

confidence: 99%

A Novel Technique for Temporarily Repair and Improvement of Damaged Pin Joint Support Bores

Karlsen

Lemu

Berkani³

2022

Applied Mechanics

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Damaged support bores due to wear and ovality can be critical for a machine and its operation, in addition to representing a safety problem and risk of pin breakage. It can be a costly operation to perform the required repairs in between planned service periods, especially because of the unplanned down time. A joint with a standard cylindrical pin will often experience wear and ovality in the support bore surfaces, and at some point, repairs will have to be performed. This study investigates and compares five options when a joint with a cylindrical pin has reached a severe level of wear and ovality, outside its planned service stop. The work involved testing the viability of 3D scanning of the damaged bore surface, 3D printing of a metal bushing, and inserting the bushing into the damaged joint. In addition, two pin solutions, i.e., a standard cylindrical pin and an expanding pin type, were installed into the repaired joint, loaded, and the strain on the pin ends close to the supports was measured. For the sake of comparison, the supports had both smooth circular bore and severe wear and ovality. It was concluded that it is possible to produce and install the 3D-printed bushing insert without major problems; the insert had satisfactory capability during test loading, and it most probably represents a good solution when it comes to the reduction in unwanted downtime during unplanned repairs of damaged joints.

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On Modelling Techniques for Mechanical Joints: Literature Study

Cited by 5 publications

References 26 publications

An Investigation of the Effects and Consequences of Combining Expanding Dual Pin with Radial Spherical Plain Bearings

An Investigation of the Effects and Consequences of Combining Expanding Dual Pin with Radial Spherical Plain Bearings

Investigation of Spectral and Temporal Characteristics of Free Vibrations of Bearing Rings Press Joints for Solving Problems of Non-Destructive Testing

A Novel Technique for Temporarily Repair and Improvement of Damaged Pin Joint Support Bores

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