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Author

Masaru Matsumoto

Bio: Masaru Matsumoto is an academic researcher from Kyoto University. The author has contributed to research in topics: Flutter & Wind tunnel. The author has an hindex of 24, co-authored 100 publications receiving 2316 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, a time domain approach for predicting the coupled flutter and buffeting response of long span bridges is presented, where the frequency dependent unsteady aerodynamic forces are represented by the convolution integrals involving the aerodynamic impulse function and structural motions or wind fluctuations.
Abstract: A time domain approach for predicting the coupled flutter and buffeting response of long span bridges is presented. The frequency dependent unsteady aerodynamic forces are represented by the convolution integrals involving the aerodynamic impulse function and structural motions or wind fluctuations. The aerodynamic impulse functions are derived from experimentally measured flutter derivatives, aerodynamic admittance functions, and spanwise coherence of aerodynamic forces using rational function approximations. A significant feature of the approach presented is that the frequency dependent characteristics of unsteady aerodynamic forces and the nonlinearities of both aerodynamic and structural origins can be modeled in the response analysis. The flutter and buffeting response of a long span suspension bridge is analyzed using the proposed time domain approach. The results show good agreement with those from the frequency domain analysis. The example used to demonstrate the proposed scheme focuses on the treatment of frequency dependent self-excited and buffeting force effects. Application to nonlinear effects will be addressed in a future publication.

305 citations

Journal ArticleDOI
TL;DR: In this article, the effects of aerodynamic coupling among modes of vibration on the flutter and buffeting re- sponse of long-span bridges are investigated by introducing the self-excited aerodynamic forces in terms of rational function approximations.
Abstract: The effects of aerodynamic coupling among modes of vibration on the flutter and buffeting re- sponse of long-span bridges are investigated. By introducing the unsteady, self-excited aerodynamic forces in terms of rational function approximations, the equations of motion in generalized modal coordinates are transformed into a frequency-independent state-space format. The frequencies, damping ratios, and complex mode shapes at a prescribed wind velocity, and the critical flutter conditions, are identified by solving a complex eigenvalue problem. A significant feature of this approach is that an iterative solution for determining the flutter conditions is not necessary, because the equations of motion are independent of frequency. The energy increase in each flutter motion cycle is examined using the work done by the generalized aerodynamic forces or by the self-excited forces along the bridge axis. Accordingly, their contribution to the aerodynamic damping can be clearly identified. The multimode flutter generation mechanism and the roles of flutter derivatives are investigated. Finally, the coupling effects on the buffeting response due to self-excited forces are also discussed.

185 citations

Journal ArticleDOI
TL;DR: In this article, the aerodynamic damping of two-dimensional rectangular prisms in smooth flow is described, and their generation mechanisms are discussed on the basis of aerodynamic derivatives, obtained from the unsteady pressure measurement under the 1DOF heaving/torsional forced vibration.

130 citations

Journal ArticleDOI
TL;DR: In this article, a series of wind tunnel tests has indicated that rain-wind induced vibration of cables can be classified into three types, that is a "galloping" type, which includes both divergent galloping and velocity restricted galloping, related to a negative slope of the lift force caused by an upper water rivulet and/or "axial flow", the vortex shedding type with long period, and their mixed type.

120 citations

Journal ArticleDOI
TL;DR: In this paper, the aerodynamic instability of inclined cables would occur by the fluid interaction between Karman vortex and axial vortex and also the axial flow along the cable axis and the upper water rivulet control this aerodynamic imbalance.

111 citations


Cited by
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Journal ArticleDOI
TL;DR: A review of mathematical models used to investigate vortex-induced vibration (VIV) of circular cylinders is given in this article, with a focus on single-degree-of-freedom (SFOF) models.

602 citations

Journal ArticleDOI
TL;DR: In this paper, the authors provide a perspective on the past, present and future of Computational Wind Engineering (CWE) and provide a more detailed view on CFD simulation of pedestrian-level wind conditions around buildings.

570 citations

Journal ArticleDOI
TL;DR: In this article, a time domain approach for predicting the coupled flutter and buffeting response of long span bridges is presented, where the frequency dependent unsteady aerodynamic forces are represented by the convolution integrals involving the aerodynamic impulse function and structural motions or wind fluctuations.
Abstract: A time domain approach for predicting the coupled flutter and buffeting response of long span bridges is presented. The frequency dependent unsteady aerodynamic forces are represented by the convolution integrals involving the aerodynamic impulse function and structural motions or wind fluctuations. The aerodynamic impulse functions are derived from experimentally measured flutter derivatives, aerodynamic admittance functions, and spanwise coherence of aerodynamic forces using rational function approximations. A significant feature of the approach presented is that the frequency dependent characteristics of unsteady aerodynamic forces and the nonlinearities of both aerodynamic and structural origins can be modeled in the response analysis. The flutter and buffeting response of a long span suspension bridge is analyzed using the proposed time domain approach. The results show good agreement with those from the frequency domain analysis. The example used to demonstrate the proposed scheme focuses on the treatment of frequency dependent self-excited and buffeting force effects. Application to nonlinear effects will be addressed in a future publication.

305 citations

Journal ArticleDOI
TL;DR: In this article, the exciting factors and mechanism of rain-wind induced vibration of polyethylene-lapped cable of cable-stayed bridges and the aerodynamic countermeasure to suppress the vibration are discussed.

267 citations

Journal ArticleDOI
TL;DR: In this paper, a new concept of energy-harvesting, the flutter-mill, is proposed in which these flutter motions are utilized to generate electrical power, based on the energy analysis of the fluid-structure interaction system.

256 citations