A numerical method for the calculation of dynamic response and acoustic radiation from an underwater structure

Zhou, Qi; Joseph, Phillip

doi:10.1016/j.jsv.2004.05.028

Cited by 40 publications

(35 citation statements)

References 16 publications

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“…In wind-induced analysis of such structures, these parameters should be considered. In still air, added mass and aerodynamic damping can be calculated by potential theory [1][2][3], and the results have been proved by experiment [4]. Yet under the action of fluctuating wind, these two parameters will change with the wind speed, test has to be done to reveal the rule.…”

Section: Introductionmentioning

confidence: 99%

The identification of added mass and aerodynamic damping using HHT method under wind action

Sun¹,

Hu²

2017

Proceedings of the 2017 6th International Conference on Energy, Environment and Sustainable Development (ICEESD 2017)

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Abstract. For the long-span roof structures which have relatively low frequency and light mass, the vibration property under the action of fluctuating wind is significantly influenced by the added mass and aerodynamic damping. Since the influence can be reflected by the change of structural frequency and damping ratio, the problem can be classified as modal parameter identification. Based on Hilbert-Huang Transform, Empirical Mode Decomposition method is applied on the output signal after IIR band pass filter. Then the Random Decrement Technique is used synchronously on all the components of degree of freedom to obtain the free decay signal of required mode, so the frequency, damping ratio and mode shape can be identified. The results of numerical example show that this method can restrain noise effectively and extract the modal parameters accurately. Taking the Geiger type cable dome as example, the added mass and aerodynamic damping under the action of fluctuating wind was identified according to the principle of highly similar mode shape, and the change law of these two parameters was also obtained compared with still air environment.

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Section: Introductionmentioning

confidence: 99%

The identification of added mass and aerodynamic damping using HHT method under wind action

Sun¹,

Hu²

2017

Proceedings of the 2017 6th International Conference on Energy, Environment and Sustainable Development (ICEESD 2017)

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“…Plates and shells are widely used as basic components in many engineering structures, such as aircrafts [1] and underwater structures [2]. Until now, their fundamental physical mechanisms and phenomenons, such as free vibration [3], wave propagation [4,5], and power flow [6], have been discussed intensely.…”

Section: Introductionmentioning

confidence: 99%

Vibration Transmission of a Cylindrical Shell with an Interior Rectangular Plate with the Receptance Method

Zhang

Sheng

Yang

2012

Advances in Acoustics and Vibration

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Vibration transmission characteristics of a cylindrical shell with a rectangular plate are discussed in this paper by the substructure receptance method. The system is divided into two substructures: the plate and the shell. After finding the theoretical receptance function of each substructure, the coupling equation of the combined system is solved by considering the continuity conditions at the joint between the plate and the shell. The numerical results are compared with the experimental ones to show the validity of the formulation. After that, effects of the plate's parameters on vibration transmission characteristics are discussed. The parameter study shows that it is important to avoid impedance matching for the plate and the shell in the design of suitable structures with low vibration and noise radiation characteristics.

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“…Usually the elastic structure is modelled with finite elements; the fluid can be modelled with finite elements, l-4 infinite elements, [5][6][7][8] or boundary element techniques. [9][10][11][12] However, there are few studies of the structural-acoustic coupling from the energy flow point of view in the literature. In the vibration control of fluid loaded structures and in the study of sound radiation from elastic structures, it is very important to understand the mechanisms of energy flow within the fluid and structure.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis and visualisation of energy flow by intensity vector method for a fluid-loaded structure

Zhaoa

2011

Journal of Marine Engineering & Technology

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The vibration energy flow in a fluid-loaded stiffened plate and the structural-acoustic coupling from the energy flow point of view are investigated using the intensity vector technique.The spatial distribution of the vibration and acoustic energy flow is visualised to show the position of energy source, the direction of flowing energy and the amount of radiation sound energy. The numerical results show that fluid loading changes the vibrational and sound energy flows. A spectrum plot shows that the structural-acoustic energy flow under air loading condition is generally at a smaller rate than that for the under water loading condition. From graphical plots, it is the sound energy flow, not the structural vibrational energy flow, that shows clearly the structural vibration mode shape. Furthermore, significant discrepancy is observed between the sound energy distribution near the surface of the plate and the vibration energy in the stiffened plate. An external damper significantly influences the vibrational and sound energy flows and the damping control strategies are investigated. Visualisations of the energy show that the damper should be placed close to the energy input source and more damping resulted in more energy dissipated.Numerical analysis and visualisation of energy flow by intensity vector method for a fluid-loaded structure Volume 10 Issue 3 September 2011Journal of Marine Engineering and Technology 42 Numerical analysis and visualisation of energy flow by intensity vector method for a fluid-loaded structure

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A numerical method for the calculation of dynamic response and acoustic radiation from an underwater structure

Cited by 40 publications

References 16 publications

The identification of added mass and aerodynamic damping using HHT method under wind action

The identification of added mass and aerodynamic damping using HHT method under wind action

Vibration Transmission of a Cylindrical Shell with an Interior Rectangular Plate with the Receptance Method

Numerical analysis and visualisation of energy flow by intensity vector method for a fluid-loaded structure

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