Fatigue life calculation procedure for the rotor of an embedded magnet traction motor taking into account thermomechanical loads

Sikanen, Eerik; Nerg, Janne; Tehrani, Mohammad Gerami; Sopanen, Jussi

doi:10.1016/j.ymssp.2018.03.055

Cited by 27 publications

(12 citation statements)

References 18 publications

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“…In fact, it has been shown 14,47,48 that the total accumulated entropy generated measured from the pristine material until the onset of failure is a material property. Using entropy as a damage metric also has been shown to forecast reliable results for the prediction of fatigue life 8,49,50 . The accumulated entropy from the start of the cyclic load ( t = 0) until the failure time ( t = t f ) can be obtained by integrating Equation 21:

FFE = \int_{0}^{t_{f}} \frac{{\overset{w}{true}}_{p}}{T} italicdt

where FFE is known as the fracture fatigue entropy (FFE), a parameter that is independent of load, frequency, and specimen geometry 14 .…”

Section: Theory and Formulationmentioning

confidence: 99%

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Application of thermoelectricity in fatigue of metals

Hajshirmohammadi

Khonsari

2021

Fatigue Fract Eng Mat Struct

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An online approach is proposed to predict the fatigue life of metallic specimens under cyclic loading using the concept of thermoelectricity. The working principle of the methodology is described, and experimental results are performed with a fully reversed bending fatigue testing apparatus to evaluate the efficacy of the approach. Results are presented that correlate the measured thermoelastic potential for low‐carbon steel 1018 specimens measured via an infrared camera. It is shown that the application of thermoelectricity provides a practical methodology for early prediction of fatigue.

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FFE = \int_{0}^{t_{f}} \frac{{\overset{w}{true}}_{p}}{T} italicdt

where FFE is known as the fracture fatigue entropy (FFE), a parameter that is independent of load, frequency, and specimen geometry 14 .…”

Section: Theory and Formulationmentioning

confidence: 99%

“…Su et al 7 characterized fatigue damage by acousto‐ultrasonic waves. Sikanen et al 8 proposed a multidisciplinary method with the superposition of mechanical and thermal stresses to predict fatigue.…”

Section: Introductionmentioning

confidence: 99%

Application of thermoelectricity in fatigue of metals

Hajshirmohammadi

Khonsari

2021

Fatigue Fract Eng Mat Struct

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“…Secondly, let the state x(t ) be constrained by the given output set  o (Ξ, ξ) with Ξ = diag(10 −8 , 10 −8 , 10 −2 , 10 −2 , 10 −8 , 0.25, 0.25), ξ = 0 7,1 so that [𝜔 x (t ), 𝜔 y (t ), T 1 (t ), T 2 (t )] are constrained by the output set while [𝜏 x (t ), 𝜏 y (t ), 𝜔 t (t )] are free states. Lastly, let the objective of stealthy ageing attacks of AT1 be the control of both motors outside of their normal torque levels in order to accelerate their ageing [40]:…”

Section: Analysis and Prevention Of At1mentioning

confidence: 99%

Analysis, prevention, and feasibility assessment of stealthy ageing attacks on dynamical systems

Escudero

Massioni

Zamaï

et al. 2021

IET Control Theory & Appl

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This article provides control theory methods to analyse, prevent, and assess the feasibility of stealthy ageing attacks on controlled physical systems, modelled as dynamical systems. This new type of attacks leads to premature failures of the physical system by accelerating its ageing and remains stealthy by maintaining the system outputs as in the attack-free case. An attacker with restrained capabilities is considered: it can only corrupt the control signals transmitted to the dynamical system. This article provides set-theoretic methods to analyse and prevent these attacks by restraining the control signals in amplitude, whether the system is stable or not. The proposed methods consist in solving optimisation problems under Linear Matrix Inequality constraints. Then, a method based on linear programming is proposed to assess the feasibility of such attacks by finding the optimal attack control signals. At the end of this article, the methods are applied on two application examples to show their relevances: a thin film manufacturing and a satellite reorientation manoeuvre.

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“…on the rotor integrity and ensuring eventually lifelong reliability. Because operating conditions of traction motors vary considerably, such multidisciplinary analyses are preferably conducted over the drive cycle; see for instance [12] or [13]. In practice, many studies are focused on the magnetic aspects of the design, and the mechanical dimensioning only considers the effect of centrifugal forces on the rotor structure [14], [15], and on the fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of Synchronous Reluctance Machines for Railway Traction Application Including Assembly Process Constraints

Kuci

Henrotte

Geuzaine

et al. 2020

2020 International Conference on Electrical Machines (ICEM)

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This paper presents the coupled electromechanical design of a synchronous reluctance machine. The purpose of the study is to decide whether such motor could substitute usual induction machines in railway traction applications. Reluctance machines are indeed competitive for applications requiring high efficiency at low cost. However, it is a challenging task to find design solutions that ensure structural integrity of the motor without compromising its overall performance, in particular in the presence of optimized flux barriers in the rotor. The design strategy presented in this paper is a combined electromagnetic and structural optimization, the latter accounting not only for the centrifugal force but also for the overstress due to manufacturing.

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Fatigue life calculation procedure for the rotor of an embedded magnet traction motor taking into account thermomechanical loads

Cited by 27 publications

References 18 publications

Application of thermoelectricity in fatigue of metals

Application of thermoelectricity in fatigue of metals

Analysis, prevention, and feasibility assessment of stealthy ageing attacks on dynamical systems

Design Optimization of Synchronous Reluctance Machines for Railway Traction Application Including Assembly Process Constraints

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