scholarly journals Research on Vibration Reduction Design of Foundation with Entangled Metallic Wire Material under High Temperature

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Yue Zhu ◽  
Yiwan Wu ◽  
Hongbai Bai ◽  
Zheyu Ding ◽  
Yichuan Shao
Keyword(s):  
High Temperature ◽  
Insertion Loss ◽  
Power Flow ◽  
Vibration Reduction ◽  
Low Frequency ◽  
Composite Foundation ◽  
Metallic Wire ◽  
Transfer Path ◽  
Wire Material ◽  
Full Speed

When the submarine is sailing at full speed, the power cabin has an abnormally high temperature. However, in the previous research on the vibration reduction design of the foundation, the influence of high temperature on the vibration characteristics of the foundation is not taken into account. In this paper, a new composite foundation with entangled metallic wire material (EMWM) is presented to reduce the vibration of the foundation. The energy transfer path of the foundation was obtained by the power flow method, and then the layout of EMWM was determined. The optimization of the constraining layer was carried out by modal analysis. The damping performance of the composite foundation with EMWM was validated by the thermal-vibration joint test. The results show that, at room temperature, the composite foundation has remarkable vibration reduction efficiency in the middle and high-frequency bands. The maximum insertion loss can reach 15.37 dB. The insertion loss varies with the location of the excitation point. As the temperature rises to 300°C, the insertion loss in the low-frequency band was improved, and the insertion loss is not influenced by the excitation position.

Vibration transmission path analysis of underwater vehicle power plant based on TPA power flow

2021 ◽  
pp. 147509022110240
Author(s):  
Yang Yang ◽  
Guang Pan ◽  
Shaoping Yin ◽  
Ying Yuan
Keyword(s):  
Power Plant ◽  
Path Analysis ◽  
Power Flow ◽  
Sea Water ◽  
Low Frequency ◽  
Underwater Vehicle ◽  
Vibration Energy ◽  
Vibration Transmission ◽  
Transmission Path ◽  
Transfer Path

In order to obtain the energy contribution of all paths transmitting vibration from the underwater vehicle power plant to the outer shell, a new method named TPA (Transfer Path Analysis) power flow which combines classical TPA and power flow theory was proposed. Calculation results showed that isolators were the critical paths for transmitting vibration energy to the shell in low frequency band. In addition the main engine and sea water pump were critical vibration sources, which provided directions for reducing the vibration energy transmitted from vibration sources to the target body. To the best of our knowledge, this was the first time to assess the vibration transmission path of the underwater vehicle by TPA power flow method. This method can be employed in other works that need to evaluate the contribution of vibration energy.

scholarly journals Analysis and Experimental Research on Vibration Reduction in Ship High-Temperature Pipeline Based on Long Coated Damping Structure

2021 ◽  
Vol 9 (8) ◽  
pp. 838
Author(s):  
Bao Zi ◽  
Feng Jiang ◽  
Yiwan Wu ◽  
Hongbai Bai ◽  
Yu Tang ◽  
...  
Keyword(s):  
High Temperature ◽  
Structural Analysis ◽  
Vibration Reduction ◽  
Experimental System ◽  
Metallic Wire ◽  
Attenuation Effect ◽  
Vibration Attenuation ◽  
Temperature Environment ◽  
Coated Layer ◽  
High Temperature Environment

To reduce the vibration of a ship’s high-temperature pipeline, a long coated damping structure (LCDS) with entangled metallic wire material (EMWM) is proposed in this paper. The structural analysis of the long coated damping structure for pipelines is carried out. The theoretical analysis indicates that increasing the thickness of the damping layer in a particular range can improve the vibration attenuation effect of an LCDS. Additionally, experimental verification confirms this analysis after an experimental system for pipelines. From the results, it is observed that increasing the thickness of the coated layer can effectively improve the damping property of LCDS to a certain extent. The change of the coated length and the temperature has little effect on the vibration attenuation effect of an LCDS, indicating that the LCDS can work well in a high-temperature environment.

scholarly journals Coupled vibration characteristics of a submarine propeller-shaft-hull system at low frequency

2019 ◽  
Vol 39 (2) ◽  
pp. 258-279
Author(s):  
Feng Chen ◽  
Yong Chen ◽  
Hongxing Hua
Keyword(s):  
Power Flow ◽  
Large Scale ◽  
Low Frequency ◽  
Vibration Characteristics ◽  
Propeller Shaft ◽  
Coupled Vibration ◽  
Transfer Path ◽  
Great Consistency ◽  
Frequency Excitation ◽  
Submarine Hull

The coupled longitudinal and transverse vibration characteristics of a submarine propeller-shaft-hull system at low frequency are studied in this paper. Two substructures, which are the propeller-shaft subsystem and the submarine hull, are first modelled using the finite element method. The two substructures are then connected through bearings, which are simplified as longitudinal and lateral springs and dampers. The modes, the natural frequencies and the coupled vibration characteristics of the two substructures and their synthesized system are simulated. An experiment studying the dynamic characteristics of a large-scale submarine test-rig is proceeded and compared with the numerical results, showing great consistency. Finally, transfer path analysis of the low frequency excitation forces using power flow method is discussed.

Research on Vibration Isolation Parameters of Double-Deck Isolation System of Heat Water Pump

2013 ◽  
Vol 694-697 ◽  
pp. 316-320
Author(s):  
Xiang Jun Kong ◽  
Er Ming Song ◽  
Chang Zheng Chen
Keyword(s):  
Power Flow ◽  
Vibration Isolation ◽  
Low Frequency ◽  
Mass Effect ◽  
Transmitted Power ◽  
Intermediate Mass ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Upper Deck ◽  
Vibration Power Flow

Isolation system of the heat water pumps can be simplified as a double sources exciting and double output double-deck vibration isolation system model, expressions of transmitted power flow and vibration speed to the basement are deduced based on the double sources exciting and double output double-deck vibration isolation system electric-force(E-F) analog picture, the curves of power flow and vibration speed transmitted to basement how the upper deck vibration isolation and intermediate mass effect are drawn by using mat lab program. The results show that the adjusting the upper deck vibration isolation stiffness parameters has little effect on the amplitude of vibration power flow, increasing intermediate mass can move first peak to the low frequency, increasing intermediate mass can obviously reduce t transmitted power flow and transmitted vibration speed amplitude to the basement.

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