Abstract
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.
Highlights
In modern warfare, the acoustic stealth performance of submarines directly affects their survival and attack. e prime sources of underwater noise for submarines are fluid noise, machinery noise, and structural borne noise [1]. e machinery noise mainly comes from various mechanical devices, weapons, and electrical equipment installed on submarines. e mechanical vibration and noise generated by these devices are transmitted to the hull structure through the support system
E foundation is a key link of the vibration transmission path. e vibration characteristic of the foundation is related to the acoustic stealth performance of submarines. e foundation is usually designed as an elastic support structure with damping function
Test Results and Analysis of entangled metallic wire material (EMWM) Composite Foundation. e electromagnetic exciter sends sinusoidal sweep force to continuously excite the foundation. e parameters of the excitation signal are given in Table 7. e response of the foundation is detected by the use of four accelerometers. e excitation and response signals are recorded and processed using the signal source and data acquisition
Summary
The acoustic stealth performance of submarines directly affects their survival and attack. e prime sources of underwater noise for submarines are fluid noise, machinery noise, and structural borne noise [1]. e machinery noise mainly comes from various mechanical devices, weapons, and electrical equipment installed on submarines. e mechanical vibration and noise generated by these devices are transmitted to the hull structure through the support system (such as the foundation). Us, flexible vibration isolation technology cannot be used to reduce the vibration of rigid foundation To solve this problem, there are three methods to reduce the vibration of rigid foundation: adding blocking masses, using composite foundation, and laying viscoelastic damping material [2]. E results show that the blocking masses can improve the structural vibration damping performance by over 5 dB. By the use of topology optimization method, Qing et al [12, 13] obtained the optimal negative Poisson’s ratio structure of functional units and designed a negative Poisson’s ratio foundation with better low-frequency vibration damping performance and bearing capacity. E core material and the panel with strong energy absorbing performance can form a sandwich structure, which has broad application prospects in ship vibration reduction. To reduce the vibration of the foundation under high temperature, a composite foundation with entangled metallic wire material is proposed. A thermal-vibration joint test for foundation is conducted to validate the proposed method
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