Vibrational power flow from machines into built-up structures, part I: Introduction and approximate analyses of beam and plate-like foundations

Goyder, Hugh; White, Robert G.

doi:10.1016/0022-460x(80)90452-6

Cited by 215 publications

(101 citation statements)

References 4 publications

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“…The in#uence of in-plane vibration increases as the angle between the two plates deviates from a right angle. 4. CONCLUSION Based on the concept of the power #ow density vector and its time-averaged value (or structural intensity) in a continuum, a dynamic substructure approach is used to derive the power #ow density vector of an L-shaped plate system by combining the force balance and geometrically compatible conditions at the coupled edge.…”

Section: Rigidly Connected Coupling Edgementioning

confidence: 99%

An Investigation of Power Flow Characteristics of L-Shaped Plates Adopting a Substructure Approach

Wang¹,

Xing²,

Price³

2002

Journal of Sound and Vibration

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Section: Rigidly Connected Coupling Edgementioning

confidence: 99%

An Investigation of Power Flow Characteristics of L-Shaped Plates Adopting a Substructure Approach

Wang¹,

Xing²,

Price³

2002

Journal of Sound and Vibration

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“…Some studies present the way to study the power #ow between the primary and secondary structures under harmonic [14] and white noise [15] input. Under the seismic input, because the energy comes from the ground, passes through the primary structure, and lastly, arrives at the secondary structures, it is certainly true that the secondary structures are always energy absorbers under the seismic input.…”

Section: Relative Power Flowmentioning

confidence: 99%

A Study on the Interaction Between the Primary and Secondary Structures of Combined Structures

Zhang

Liang

2000

Journal of Sound and Vibration

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“…Meanwhile, many researchers analyzed the problem by using the power flow theory. Since the late 1970s, the power flow was used to measure the vibration noisy has been accepted widely [3][4]. After that, White and Gardomin, etc., thoroughly induced the research results about the power flow, and then they used it on the analysis of the machine vibration transfer and the noisy and obtained some significant achievements [5][6].…”

Section: Introductionmentioning

confidence: 99%

Research on the hydraulic turbine vertical vibration power flow in the head cover system

Zhi¹,

Y²

2012

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. On the basis of the prior models about the vertical vibration of the hydraulic vibration source, this research introduced a sub-system---head cover. Head cover is one of the main paths when vibration is transferred from the water vibration source to the stable structure. This essay aims to analyze the hydraulic turbine vertical vibration power flow in the head cover system. The research is based on the power flow theory and the probability perturbation method; meanwhile, it considered on the reciprocal coupling effect of the water machine parts and power house structure, etc. Therefore, the results of can clearly provide the random power flow of the vibration transfer path system, which including the head cover system, in frequency domain by given of some uncertain factors in one project. In conclusions, the research provide an overall analysis on the hydropower station vertical vibration transfer path; and it suggest some simplified and efficient solutions in the analysis on the vibration path with some random parameters. IntroductionIn the system of the hydropower station powerhouse and unit vibration, the fluid is the sole energy source of the vibration, as well as the moving medium; therefore, the hydraulic vibration is the main vibration source in the vibration system. It can be proved by the field and model experiments that there are three main transfer paths which transfer from the hydraulic turbine vibration to the powerhouse structure [1]. The three transfer paths are separately: (1) runner-shafting-bearing-fixed parts (machine frame, head cover)-powerhouse; (2) filling water pressure-spiral case-powerhouse; (3)runner-negative runner pressure area-head cover-powerhouse. Now, many researches about the vertical vibration of the hydraulic vibration source mainly focused on the path (1) and usually ignored the path (2) and path (3) [2]. With the development of the large scale and complication of the hydropower station structure, the including control parts and its weight of the head cover system increased continually, then its influence on the hydraulic vibration become more important. Therefore, the analysis on path (3) appears more important.The hydropower station vibration system problem belongs to the classic random structure system problem, due to the complexity of the hydropower station structure and the uncertainty of the parts production, installation as well as materials parameters. Now, the main methods, which are used to solve the random structure system problem, could be found the traditional Monte-Carlo simulation method, the second-order moment method, the probability perturbation method and the random finite element method, etc.. Meanwhile, many researchers analyzed the problem by using the power flow

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Vibrational power flow from machines into built-up structures, part I: Introduction and approximate analyses of beam and plate-like foundations

Cited by 215 publications

References 4 publications

An Investigation of Power Flow Characteristics of L-Shaped Plates Adopting a Substructure Approach

An Investigation of Power Flow Characteristics of L-Shaped Plates Adopting a Substructure Approach

A Study on the Interaction Between the Primary and Secondary Structures of Combined Structures

Research on the hydraulic turbine vertical vibration power flow in the head cover system

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