SShOL-1.1.6/12-M 3.UCh.2 electric shaft surface

N. L. Nisnevich

doi:10.1007/bf01144887

Study of the character and causes of destruction of the cardan shaft of the propeller engine

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2019-85-12-43-50 ◽

2019 ◽

Vol 85 (12) ◽

pp. 43-50

Author(s):

D. A. Movenko ◽

L. V. Morozova ◽

S. V. Shurtakov

Keyword(s):

Mechanical Properties ◽

Chemical Composition ◽

Yield Point ◽

Protective Coating ◽

Fracture Pattern ◽

Corrosion Cracking ◽

Tempered Martensite ◽

Neck Formation ◽

Static Mechanism ◽

Shaft Surface

The results of studying operational destruction of a high-loaded cardan shaft of the propeller engine made of steel 38KhN3MFA are presented to elucidate the cause of damage and develop a set of recommendations and measures aimed at elimination of adverse factors. Methods of scanning electron and optical microscopy, as well as X-ray spectral microanalysis are used to determine the mechanical properties, chemical composition, microstructure, and fracture pattern of cardan shaft fragments. It is shown that the mechanical properties and chemical composition of the material correspond to the requirements of the regulatory documentation, defects of metallurgical origin both in the shaft metal and in the fractures are absent. The microstructure of the studied shaft fragments is tempered martensite. Fractographic analysis revealed that the destruction of cardan shaft occurred by a static mechanism. The fracture surface is coated with corrosion products. The revealed cracks developed by the mechanism of corrosion cracking due to violation of the protective coating on the shaft. The results of the study showed that the destruction of the cardan shaft of a propeller engine made of steel 38Kh3MFA occurred due to formation and development of spiral cracks by the mechanism of stress corrosion cracking under loads below the yield point of steel. The reason for «neck» formation upon destruction of the shaft fragment is attributed to the yield point of steel attained during operation. Regular preventive inspections are recommended to assess the safety of the protective coating on the shaft surface to exclude formation and development of corrosion cracks.

Download Full-text

Mathematical model of a radial sliding bearing with a porous layer on its operating surface with a low-melting metal coating on shaft surface

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1064/1/012005 ◽

2021 ◽

Vol 1064 (1) ◽

pp. 012005

Author(s):

K S Akhverdiev ◽

E A Bolgova ◽

M A Mukutadze ◽

V V Vasilenko

Keyword(s):

Mathematical Model ◽

Porous Layer ◽

Metal Coating ◽

Sliding Bearing ◽

Shaft Surface

Download Full-text

Optimized Design of Vibration Controllers for Steady and Transient Excitation of Flexible Rotors

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/pime_proc_1995_209_139_02 ◽

1995 ◽

Vol 209 (3) ◽

pp. 155-168 ◽

Cited By ~ 16

Author(s):

P S Keogh ◽

C Mu ◽

C R Burrows

Keyword(s):

Measurement Error ◽

Controller Design ◽

Optimized Design ◽

Rotor Vibration ◽

Transient Vibration ◽

Flexible Rotors ◽

Vibration Attenuation ◽

Measured Displacement ◽

Control Forces ◽

Shaft Surface

Controller designs for the attenuation of rotor vibration are investigated. Disturbance inputs leading to vibration are classified and related to control forces and defined control states. Optimization based on the H∞ norm is then used to minimize the influence of forcing disturbances, modelling error and measurement error. The practicalities of applying the method to an experimental rotor-bearing system, with hardware constraints on controller order, are stated. The controller was implemented experimentally to conduct steady state and mass loss tests. Steady synchronous, non-synchronous and transient vibration attenuation was demonstrated. It was also shown that measurement error, caused by shaft surface roughness, can be incorporated into the controller design without the need to remove the roughness component from the measured displacement signals. If the roughness influence is not included in the design and the uncontrolled vibration is small, unnecessary control forces may result, causing an increase in vibration.

Download Full-text

Paper Polished Shaft Surface Finish for Radial Lip Seals

10.4271/930534 ◽

1993 ◽

Author(s):

Bruce Lyle Murden

Keyword(s):

Surface Finish ◽

Lip Seals ◽

Shaft Surface

Download Full-text

A Friction-Reducing Shaft Surface for Use With Standard Radial Sharp Lip Oil Seals

10.4271/810201 ◽

1981 ◽

Cited By ~ 2

Author(s):

James D. Symons

Keyword(s):

Friction Reducing ◽

Shaft Surface

Download Full-text

Brush seal with thermo-regulating bimetal elements

Open Engineering ◽

10.1515/eng-2018-0037 ◽

2018 ◽

Vol 8 (1) ◽

pp. 307-313 ◽

Cited By ~ 1

Author(s):

Michał Stanclik

Keyword(s):

Heat Flux ◽

Contact Area ◽

Heat Load ◽

Experimental Results ◽

Frictional Heat ◽

Brush Seal ◽

Thermoregulatory Function ◽

Shaft Surface

Abstract This paper presents a new brush seal construction idea. It was shown that it is possible to use bimetallic elements for the construction of the brush seal, which have a thermoregulatory function by relieving a contact area between bristles and a shaft surface reducing frictional heat flux. This should improve the durability of the seal by diminishing the heat load and significantly decreases the temperature of the seal during the startup/ shutdown. This article shows a simplified construction of the concept brush seal as well as numerical and experimental results.

Download Full-text