Analysis and Research on Influence of Plate-Shell Structure Thickness on Impedance Characteristics
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摘要: 机械设备的振动性能与安装基础结构的阻抗特性密切相关，而结构板厚度是影响结构的阻抗特性的重要因素之一。本文针对船舶机械设备典型板壳类安装基础结构，通过研究结构板厚度对结构的阻抗特性的影响规律，发现只有结构承载面和底面的板厚度对结构的阻抗特性有着较为明显的影响，而支承面的板厚度不会明显影响，由此得出了结构的阻抗特性模拟设计基本方法。根据该方法，设计了结构的阻抗特性模拟体，并进行了阻抗特性试验测试。试验结果表明，结构模拟体的阻抗特性与实际结构的阻抗特性较为接近，验证了设计方法的有效性。Abstract: The vibration performance of mechanical equipment is closely related to the impedance characteristics of the installation infrastructure, and the thickness of the structural plate is one of the important factors affecting the impedance characteristics of the structure. In this paper, for the typical plate and shell installation infrastructure of marine mechanical equipment, by studying the influence law of the thickness of the structural plate on the impedance characteristics of the structure, it is found that only the thickness of the bearing surface and bottom surface of the structure has a significant impact on the impedance characteristics of the structure, but the thickness of the supporting surface does not. Therefore, the basic method for the simulation design of the impedance characteristics of the structure is obtained. According to this method, the impedance characteristic simulator of the structure is designed, and the impedance characteristic test is carried out. The test results show that the impedance characteristic of the structural simulator is close to that of the actual structure, which verifies the effectiveness of the design method.
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Key words:
- Plate-shell structure /
- Impedance characteristics /
- Simulation design /
- Plate thickness
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图 3 不同厚度板2的结构的速度阻抗特性曲线
Figure 3. Velocity Impedance Characteristic Curve of Structure with Different Thicknesses of Plate 2
图 4 不同厚度板3的结构的速度阻抗特性曲线
Figure 4. Velocity Impedance Characteristic Curve of Structure with Different Thicknesses of Plate 3
图 5 不同厚度壳1的结构的速度阻抗特性曲线
Figure 5. Velocity Impedance Characteristic Curve of Structure with Different Thicknesses of Shell 1
图 6 不同厚度壳2的结构的速度阻抗特性曲线
Figure 6. Velocity Impedance Characteristic Curve of Structure with Different Thicknesses of Shell 2
图 7 不同承载面（板1）厚度的结构的速度阻抗特性曲线
Figure 7. Velocity Impedance Characteristic Curve of Structure with Different Thicknesses of the Bearing Surface (Plate 1) of the Structure
图 8 不同结构底面（板4）厚度的结构的速度阻抗特性曲线
Figure 8. Velocity Impedance Characteristic Curve of Structure with Different Thicknesses of the Bottom Surface (Plate 4) of the Structure
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