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Article
Publication date: 5 March 2010

Yasuaki Hashikura, Koji Takahashi, Yuji Miyazaki, Keiji Houjou and Kotoji Ando

The purpose of this paper is to study the effects of overload on the threshold stress intensity factor range (ΔKth) in SUS316.

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Abstract

Purpose

The purpose of this paper is to study the effects of overload on the threshold stress intensity factor range (ΔKth) in SUS316.

Design/methodology/approach

The fatigue tests are carried out to determine the resultant threshold stress intensity factor range (ΔKth). The mechanism of the improvement of ΔKth by the tensile overloading is analyzed using the Dugdale model.

Findings

It is clarified that the value of ΔKth increases as increasing the overloading.

Research limitations/implications

The apparent value of ΔKth of stainless steel can be improved by a tensile overload, the fatigue strength of structural members that have a surface crack can be increased by a tensile overload.

Originality/value

As a result, the reliability and safety of structures, such as energy plants, can also be improved.

Details

International Journal of Structural Integrity, vol. 1 no. 1
Type: Research Article
ISSN: 1757-9864

Keywords

Available. Content available
Article
Publication date: 30 August 2011

M.M.I. Hammouda

246

Abstract

Details

International Journal of Structural Integrity, vol. 2 no. 3
Type: Research Article
ISSN: 1757-9864

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Article
Publication date: 4 September 2017

Yuji Shindo, Akihisa Kameari and Tetsuji Matsuo

This paper aims to discuss the relationship between the continued fraction form of the analytical solution in the frequency domain, the orthogonal function expansion and their…

132

Abstract

Purpose

This paper aims to discuss the relationship between the continued fraction form of the analytical solution in the frequency domain, the orthogonal function expansion and their circuit realization to derive an efficient representation of the eddy-current field in the conducting sheet and wire/cylinder. Effective frequency ranges of representations are analytically derived.

Design/methodology/approach

The Cauer circuit representation is derived from the continued fraction form of analytical solution and from the orthogonal polynomial expansion. Simple circuit calculations give the upper frequency bounds where the truncated circuit and orthogonal expansion are applicable.

Findings

The Cauer circuit representation and the orthogonal polynomial expansions for the magnetic sheet in the E-mode and for the wire in the axial H-mode are derived. The upper frequency bound for the Cauer circuit is roughly proportional to N4 with N inductive elements, whereas the frequency bound for the finite element eddy-current analysis with uniform N elements is roughly proportional to N2.

Practical implications

The Cauer circuit representation is expected to provide an efficient homogenization method because it requires only several elements to describe the eddy-current field over a wide frequency range.

Originality/value

The applicable frequency ranges are analytically derived depending on the conductor geometry and on the truncation types.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 36 no. 5
Type: Research Article
ISSN: 0332-1649

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Book part
Publication date: 21 July 2011

Jon S.T. Quah

The Lockheed scandal was exposed during the 4 February 1976 hearings of the Sub-Committee on Multinational Corporations of the United States Senate Committee on Foreign Relations…

Abstract

The Lockheed scandal was exposed during the 4 February 1976 hearings of the Sub-Committee on Multinational Corporations of the United States Senate Committee on Foreign Relations. These hearings revealed that Lockheed Aircraft Corporation paid illegal payments in several countries including Japan to promote the sale of its planes to prevent bankruptcy. The Securities Exchange Commission obtained documents showing that Lockheed paid more than US$10 million to Yoshio Kodama, a “fixer” and Lockheed's secret representative, and the Marubeni Corporation, which was Lockheed's agent in Japan since 1959. During the same hearings on 6 February, A. Carl Kotchian, vice president of Lockheed, informed the committee that a senior Japanese government official received US$2 million from Marubeni and that his company relied on Kenji Osano, a close associate of former Prime Minister Kakuei Tanaka, as an intermediary in its efforts to sell 21 Lockheed's L-1001 Tristar airbuses to All Nippon Airways (ANA) (Macdougall, 1988, pp. 193–195).

Details

Curbing Corruption in Asian Countries: An Impossible Dream?
Type: Book
ISBN: 978-0-85724-819-0

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Article
Publication date: 21 August 2009

Fei Wang, Chengdong Wu, Xinthe Xu and Yunzhou Zhang

The purpose of this paper is to present a coordinated control strategy for stable walking of biped robot with heterogeneous legs (BRHL), which consists of artificial leg (AL) and…

611

Abstract

Purpose

The purpose of this paper is to present a coordinated control strategy for stable walking of biped robot with heterogeneous legs (BRHL), which consists of artificial leg (AL) and intelligent bionic leg (IBL).

Design/methodology/approach

The original concentrated control in common biped robot system is replaced by a master‐slave dual‐leg coordinated control. P‐type open/closed‐loop iterative learning control is used to realize the time‐varying gait tracking for IBL to AL.

Findings

The new control architecture can simplify gait planning scheme of BRHL system with complicated closed‐chain mechanism and mixed driving mode.

Research limitations/implications

Designing and constructing a suitable magneto‐rheological damper can greatly improve the control performance of IBL.

Practical implications

Master‐slave coordination strategy is suitable for BRHL stable walking control.

Originality/value

The concepts and methods of dual‐leg coordination have not been explicitly proposed in single biped robot control research before. Master‐slave coordinated control strategy is suitable for complicated BRHL.

Details

Industrial Robot: An International Journal, vol. 36 no. 5
Type: Research Article
ISSN: 0143-991X

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