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Finite element analysis of mechanical stress in in-wheel motor

Xu Jie

Archives of Electrical Engineering

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2022

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Vol. 71, nr 2

455--469

EN

When the in-wheel motor is working, it will be affected by gravity, centrifugal force and electromagnetic force. These three kinds of mechanical loads will affect the mechanical stress characteristics of the in-wheel motor, and then affect the reliability of the in-wheel motor structure. In order to understand the influence of the above loads on the mechanical stress of the in-wheel motor, this paper takes a 15-kW built-in permanent magnet in-wheel motor as the research object. Based on the establishment of the electromagnetic field and structure field coupling analysis model of the in-wheel motor, the mechanical stress of the in-wheel motor under different mechanical loads under rated and peak conditions are calculated and analyzed, and the influence of different mechanical loads on the stress and deformation of the in-wheel motor are studied. The research results show that, regardless of the rated operating condition or the peak operating condition, the in-wheel motor has the largest mechanical stress and deformation under the combined action of centrifugal force and electromagnetic force, and the smallest mechanical stress and deformation under the action of gravity only; under the same load (except for the case of gravity only), the stress and deformation of the in-wheel motor under the peak operating condition are larger than those under the rated operating condition; and the maximum stress and deformation of the in-wheel motor appear at the rotor magnetic bridge and the inner edge of the rotor, respectively, so the rotor is an easily damaged part of the in-wheel motor.

2

Finite element analysis of a composite piston for a diesel aircraft engine

Pietrykowski Konrad, Magryta Paweł, Skiba Krzysztof

Combustion Engines

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2019

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R. 58, nr 4

107--111

EN

The article presents calculations of thermal and mechanical loads of the piston, consisting of two parts: steel and aluminum. The calculations were made using FEM in the Abaqus software. The piston is characterized by a split construction and was equipped with a cooling oil channel. The piston will be used in an aircraft diesel engine characterized by opposite piston movement. The presented geometry of the piston is the next of the ones being developed earlier and contains preliminary assumptions as to the size and main geometrical dimensions. The thermal boundary conditions of the simulation tests assumed defined areas of heat reception surface and heating of the piston by defining a temperature map on its crown. The results of these studies were presented in the form of temperature distribution and heat flux on the surface of the tested element. The strength boundary conditions assumed a mechanical load in the form of pressure resulting from the pressure in the combustion chamber applied to the piston crown surface and the opposite pressure defined on the support at the surface of contact between the piston and the piston pin. The results of these tests were presented in the form of stress distribution on the surface of the tested element. As a result of the analyses carried out, the results constituting the basis for further modernization of the piston geometry were obtained.

3

The Influence of the Use of Fasteners with Different Stiffness in Hybrid Joints Subjected to Complex Mechanical Loads

Sadowski T., Nowicki M., Golewski P.

Archives of Metallurgy and Materials

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2019

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Vol. 64, iss. 4

1263--1268

EN

To this day, most of the papers related to hybrid joints were focused on single and double lap joints in which shear deformation and degradation was the dominant phenomenon. However, in real constructions, complex state of loads can be created by: a) torsion with shear, b) bending with shear, c) torsion with tensile. Analytical and numerical computation for simple mechanical joints is known, however, the introduction of an adhesive layer to this joint makes the load transferred both through: (1) the adhesive and (2) mechanical fasteners. There is also an interaction between the amount and stiffness of mechanical fasteners and the strength of the adhesive layer. The paper presents the results of numerical calculations for the bending with shear type of load for the hybrid structural joint and corresponding simple joints by: (1) pure adhesion and (2) rivets with different quantity maintaining the same cross-sectional area. A total of 9 simulations were performed for: (1) 4 types of pure rivets connections, (2) pure adhesive joint and (3) 4 kinds of hybrid joints. The surface-based cohesive behavior was used for creation of the adhesive layer, whereas the rivets were modelled by connector type fasteners, which simplify complexity of the numerical model. The use of connectors allowed for effort assessment taking into account damage in both types of connections. Application of connector elements can be useful for larger structures modelling, e.g. aircraft fuselage, where the number of mechanical joints is significant and complex load conditions occur.

4

Forced vibrations due to mechanical loads in thermoviscoelastic halfspaces

Sharma J. N., Chand R., Chand D.

International Journal of Applied Mechanics and Engineering

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2006

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Vol. 11, no 1

105-121

EN

In the present article the Kelvin-Voigt model of linear viscoelasticity which describes the viscoelastic nature of a material is used to investigate the forced vibrations due to mechanical loads acting on the boundary of a thermoviscoelastic continuum. The Laplace and Hankel transform technique has been employed to solve the boundary value problem in the transform domain, in the context of various theories of generalized thermoelasticity. The inverse transform integrals are evaluated by using Romberg integration in order to obtain the results in the physical domain. The temperature and stresses so obtained in the physical domain are computed numerically and presented graphically in different situations for a copper material. The comparison of results for different theories of generalized thermoviscoelasticity is also presented at appropriate stages of this work.

5

Łącznik kątowy wielkości 75

Heyman M., Czardybon J.

Bezpieczeństwo i Technika Pożarnicza

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2006

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Nr 2/4

239--242

PL

W niniejszym artykule przedstawiono łącznik kątowy, przeznaczony do współpracy z prądownicą prostą wielkości 75, służący do zmniejszenia obciążeń mechanicznych oddziałujących na strażaka podczas podawania wody linią wężową 75. Przedstawiono także budowę, zasadę działania i korzyści wynikające ze stosowania łącznika kątowego 75.

EN

There was presented nozzle holder, designated for cooperation with smooth nozzle size 75, which serve for reducing of mechanical loads acting on firefighter during delivery of water by hose line 75. There were presented construction, principle of functioning and advantages of use of nozzle holder 75 too.

6

Metody opisu zachowania się metali i stopów w warunkach nieizotermicznych obciążeń cieplno-mechanicznych

Śloderbach Z.

Dozór Techniczny

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2003

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z. 4

81--84, 86

PL

W pracy przedstawiono skrótowo niektóre metody opisujące i przewidujące zachowanie się różnych metali i stopów w warunkach nieizotermicznych obciążeń cieplno-mechanicznych w oparciu o dostępny autorowi przegląd literatury. Przedstawiono różne analityczne zależności, które wynikają z przyjęcia hipotezy Ludwika o istnieniu "mechanicznego równania stanu". Ponieważ podczas nieizotermicznych procesów "mechaniczne równanie stanu" nie istnieje (nie jest słuszne), przedstawiono więc dwie znane hipotezy służące do określenia postaci równań konstytutywnych lub "plastycznego równania stanu", które będą prawidłowo opisywać wyniki badań doświadczalnych dla tych rodzajów procesów. Przedstawiono także opracowaną metodykę zadań doświadczalnych dla wyznaczenia makroskopowego parametru wewnętrznego, który ujmował będzie wpływ efektu historii temperatury i prędkości odkształcenia na aktualne zachowanie się materiału.

7

Optymalizacja technologicznej warstwy wierzchniej w warunkach cyklicznych, stykowych obciążeń mechanicznych i cieplnych.

Gawroński Z., Kubiak T., Sawicki J.

Inżynieria Materiałowa

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2002

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R. XXIII, nr 5

274-279

PL

W omawianej pracy przy użyciu metody elementów skończonych i pakietu ANSYS dokonano optymalizacji technologicznej warstwy wierzchniej modelowej matrycy kuźniczej. Zoptymalizowano kształt matrycy, obróbkę powierzchniową oraz wykazano wpływ rodzaju materiału kutego na rozkład naprężeń w warstwie wierzchniej, decydujących o trwałości narzędzia.

EN

The present paper presents an optimization of technological surface layer of modelled drop-forging die, using the FEM method and ANSYS program. The shape of the die, as well as its surface treatment, has been optimized. The influence of the type of the material died on the distribution of residual stress in the surface layer, which in turn decides about the tool durability, has also been demonstrated.