Analysis of the input power flow characteristics of cylindrical shells with combination boundaries

Chen, Luyun; Liu, Yong

doi:10.1177/1461348418814123

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…The main components of an axial fan include an intake box, inlet and outlet flexible connection, main casing, impeller and supporting main bearing group, diffuser, hydraulic regulation system, etc. [8]. When the fan is in operation, the air flowing into the fan from the system pipeline changes direction through the intake box and flows to the impeller to achieve pressurization after converging and accelerating through the collector.…”

Section: Working Principle and Resonance Mechanismmentioning

confidence: 99%

Research on structural resonance of large axial fan in power plant

Kang,

Ao,

2024

J. Phys.: Conf. Ser.

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According to the structural characteristics of the axial fan, the causes of equipment resonance are analyzed. Four reference methods are proposed, including strengthen the structural stiffness, change the exciting frequency, weaken the exciting force, and strengthen the damping. The characteristics of the response treatment measures are discussed. Take the two-stage axial-induced draft fan of a 600 MW unit as an example, the axial resonance problem has been dealt with well by improving the support stiffness and reducing the excitation force. The research results and treatment can provide an experience reference for the analysis and treatment of the resonance problem of large axial fans.

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Section: Working Principle and Resonance Mechanismmentioning

confidence: 99%

Research on structural resonance of large axial fan in power plant

Kang,

Ao,

2024

J. Phys.: Conf. Ser.

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“…According to the research results by Chan [20], Chen [21,22] and Guo [24], the double reflection method is highly effective to solve the acoustic radiation problem in the quarterinfinite acoustic space. The double reflection method states that the quarter-infinite space has four acoustic radiation sources, as shown in Figure 3.…”

Section: Double-reflection Theorymentioning

confidence: 99%

“…The double reflection method is presented to address multiple issues caused by the acoustic boundary [19,20]. Multiple boundary problems can be solved by combining the double reflection method with the elastic wave Graf addition principle and the research scope for vibro-acoustic problems to vibration power flow problems has been extended with the inclusion of the right-angle domain of the acoustic radiation from the cylindrical shell structure [21][22][23][24]. It is necessary and feasible to study the noise characteristics caused by a pipeline structure in a rigid corner of a cabin.…”

Section: Introductionmentioning

confidence: 99%

Flow-Induced Noise Characteristics Analysis of a Pipeline Structure in a Cabin Rigid Corner

Chen,

et al. 2023

Applied Sciences

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The acoustic radiation characteristics of pipeline structures caused by turbulent fluctuating pressure are among the most important acoustic radiation sources in vessel cabins. Studying the vibro-acoustic characteristics of pipeline structures is of great relevance to engineering. The turbulence fluctuation pressure of pipeline structures’ inner surfaces was numerically analyzed by using the large eddy simulation (LES) method. At first, the vibro-acoustic differential equation of the pipeline structure system was derived by defining the fluctuation pressure as the excitation loading. According to the acoustic radiation characteristic in the quarter-infinite space, which had a combination of two rigid wall interfaces at the same time for the pipeline structures in the vessel cabins, the double reflection method, mirror image method and elastic wave Graf addition principle were applied, and the analytical function of the acoustic radiation for the cylindrical shell was derived. For the pipeline structures in the quarter-infinite acoustic space, for example, the numerical calculation for the acoustic radiation of cylindrical shell was carried out, which was excited by the turbulent pulsating pressure. Finally, the influence of inner flow velocity, frequency, and pipeline installation position were compared using numerical analysis. The results can provide technical support for the acoustic design of pipeline structure systems with complex acoustic boundaries.

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Vibrational Power Flow Analysis for the Sandwich Cylindrical Shell Structure with a Metal–Rubber Core in the Thermal Environment

Xue

et al. 2023

Int. J. Str. Stab. Dyn.

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This research is designed to investigate the vibrational characteristics of a sandwich cylindrical shell structure with an elastic-porous metal–rubber core in the thermal environment by the power flow method. The finite element models of the homogeneous and sandwich cylindrical shell structures are established for harmonic response analysis completed by the mode superposition method. Further, the structural power flow is calculated and visualized based on the results of the finite element analysis. A comparison is made with the results for a plate available in the literature validating the effectiveness of the power flow visualization method. The effects of some key factors, such as the frequency, the metal–rubber core, the length-to-radius ratio, and the temperature on the power flow of the sandwich cylindrical shell structure, are analyzed using power flow cloud pictures and vector diagrams. The results reveal that the frequency affects the distribution of power flow, and the metal–rubber core can dissipate energy, whereas the length-to-radius ratio and temperature do not have a significant influence on the power flow of the sandwich cylindrical shell structure with a metal–rubber core (SCS-MR). This work should be valuable for the noise and vibration control application of the SCS-MR.

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Analysis of the input power flow characteristics of cylindrical shells with combination boundaries

Cited by 3 publications

References 24 publications

Research on structural resonance of large axial fan in power plant

Research on structural resonance of large axial fan in power plant

Flow-Induced Noise Characteristics Analysis of a Pipeline Structure in a Cabin Rigid Corner

Vibrational Power Flow Analysis for the Sandwich Cylindrical Shell Structure with a Metal–Rubber Core in the Thermal Environment

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