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Transient analysis of several cracks in an orthotropic material under impact load
M. M. Monfared,M. Ayatollahi 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.8
In this paper, the dynamic response of an orthotropic plane with multiple cracks is analyzed analytically. The anti-plane impact loading condition is considered. The dislocation solution is utilized to derive integral equations for multiple interacting cracks with any location and orientation in an orthotropic plane. These equations are solved numerically thereby obtaining the dislocation density function on the crack faces and stress intensity factors of cracks. Numerical results are presented to illustrate the influences of parameters such as cracks geometry and orientation on the dynamic stress intensity factors.
A New Synchronous Reference Frame-Based Method for Single-Phase Shunt Active Power Filters
Monfared, Mohammad,Golestan, Saeed,Guerrero, Josep M. The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.4
This paper discusses the design of a novel synchronous reference frame (SRF) method that can extract the reference compensating current for single-phase shunt active power filters (APFs). Unlike previous SRF studies, the proposed method has an innovative feature that does not require a fictitious current signal. Other key features of the proposed strategy include frequency-independent operation, accurate reference current extraction, and relatively fast transient response. The effectiveness of the proposed method is investigated by conducting a detailed mathematical analysis. Results of the analysis confirm the superior performance of the suggested approach. Theoretical evaluations are confirmed by the experimental results.
M. Hassani,M.M. Monfared,A. Salarvand 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.86 No.4
In the present paper, multiple interface cracks between a functionally graded orthotropic coating and an orthotropic half-plane substrate under concentrated loading are considered by means of the distribution dislocation technique (DDT). With the use of integration of Fourier transform the problem is reduced to a system of Cauchy-type singular integral equations which are solved numerically to compute the dislocation density on the surfaces of the cracks. The distribution dislocation is a powerful method to calculate accurate solutions to plane crack problems, especially this method is very good to find SIFs for multiple unequal cracks located at the interface. Hence this technique allows considering any number of interface cracks. The primary objective of this paper is to investigate the effects of the interaction of multiple interface cracks, load location, material orthotropy, nonhomogeneity parameters and geometry parameters on the modes I and II SIFs. Numerical results show that modes I/II SIFs decrease with increasing the nonhomogeneity parameter and the highest magnitude of SIF occurs where distances between the load location and crack tips are minimal.
A New Synchronous Reference Frame-Based Method for Single-Phase Shunt Active Power Filters
Mohammad Monfared,Saeed Golestan,Josep M. Guerrero 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.4
This paper discusses the design of a novel synchronous reference frame (SRF) method that can extract the reference compensating current for single-phase shunt active power filters (APFs). Unlike previous SRF studies, the proposed method has an innovative feature that does not require a fictitious current signal. Other key features of the proposed strategy include frequency-independent operation, accurate reference current extraction, and relatively fast transient response. The effectiveness of the proposed method is investigated by conducting a detailed mathematical analysis. Results of the analysis confirm the superior performance of the suggested approach. Theoretical evaluations are confirmed by the experimental results.