Study on dynamic characteristics of bolt-PEEK vibration isolation pad connection structure
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摘要: 文中建立了基于梁模型的隔振材料动力特性识别实验台, 对聚醚醚酮(PEEK)材料的弹性模量和阻尼进行了识别和验证。建立了螺栓隔振结构的有限元模型, 搭建了实验台, 验证了螺栓隔振结构模型的精确性。为研究隔振结构对鱼雷噪声控制的贡献, 应用虚拟样机技术提取了鱼雷动力的激励力和扭矩, 建立了鱼雷的结构动力学模型, 在发动机与鱼雷壳体连接处应用了前述的螺栓隔振结构模型。本文首次结合隔振圈建模理论和螺栓隔振结构, 建立了鱼雷动力的整机隔振仿真模型。仿真结果揭示, 综合使用隔振圈结合螺栓连接采取隔振措施可使鱼雷振动噪声可降低3.64 dB。研究结果指出PEEK作为隔振材料可实现鱼雷振动控制提供了有力的理论支撑。Abstract: In this paper, a dynamic characteristics identification bench of vibration isolation materials based on beam model was established, and the elastic modulus and damping of poly-ether-ether-ketone materials were identified and verified. The finite element model of bolt vibration isolation structure was established, and an experimental bench was built to verify the accuracy of the bolt vibration isolation structure model. In order to study the contribution of vibration isolation structure to torpedo noise control, the virtual prototype technology is used to extract the excitation force and torque of torpedo power, establish the structural dynamics model of torpedo, and apply the aforementioned bolt vibration isolation structure model at the connection between the engine and the torpedo shell. In this paper, combined with the vibration isolation ring modeling theory and bolt vibration isolation structure, this paper establishes a torpedo-powered vibration isolation simulation model. The simulation results show that the vibration and noise of torpedoes can be reduced by 3.64 dB by comprehensively using vibration isolation rings combined with bolted connections. The results show that polyetheretherketone as a vibration isolation material can realize the vibration control of torpedoes, which provides a strong theoretical support.
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Key words:
- torpedo /
- vibration isolation /
- PEEK /
- dynamic characteristics /
- vibration control
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图 1 鱼雷发动机隔振结构示意图
Figure 1. Schematic diagram of torpedo engine vibration isolation structure
图 10 系统总刚度随单个隔振垫弹性模量变化曲线
Figure 10. Curve of total system stiffness with elastic modulus of individual vibration isolators
表 1 弹性模量求解结果
Table 1. Elastic modulus results
单位：Pa 编号 1 2 3 4 5 平均值 PEEK1 1.008×1010 1.011×1010 1.011×1010 1.011×1010 1.012×1010 1.01×1010 PEEK2 8.082×109 8.169×109 8.224×1009 8.271×109 8.265×109 8.20×109 PEEK3 9.906×109 1.018×1010 1.016×1010 1.024×1010 1.023×1010 1.01×1010 PEEK4 9.487×109 9.517×109 1.104×1010 9.310×109 9.313×109 9.73×109 PEEK5 9.428×109 9.405×109 9.390×109 9.508×109 9.473×109 9.44×109 PEEK6 1.083×1010 1.121×1010 1.105×1010 1.104×1010 1.098×1010 1.10×1010 PEEK7 1.531×1010 1.532×1010 1.529×1010 1.534×1010 1.536×1010 1.53×1010 PEEK8 8.573×109 8.678×109 8.649×109 8.648×109 8.721×109 8.65×109 PEEK9 8.174×109 8.122×109 8.032×109 8.043×109 8.066×109 8.09×109 PEEK10 8.300×109 8.409×109 8.411×109 8.419×109 8.458×109 8.40×109 
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表 2 等应力梁弹性模量实验结果
Table 2. Test results of elastic modulus with equal stress beam
位置 实验1 实验2 弹性模量/Pa 误差% 弹性模量/Pa 误差/% 位置1 8.81×109 1.84 8.74×109 1.04 位置2 9.36×109 8.20 9.19×109 6.24
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表 3 阻尼比结果
Table 3. Damping ratio results
编号 ω/Hz ξ PEEK1 30.042 0.007 PEEK2 31.956 0.008 PEEK3 31.416 0.008 PEEK4 31.523 0.009 PEEK5 32.089 0.005 PEEK6 33.104 0.006 PEEK7 37.095 0.010 PEEK8 28.473 0.005 PEEK9 27.672 0.005 PEEK10 29.875 0.010
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表 4 不同阶次下固有频率
Table 4. Natural frequencies at different orders
阶数 固有频率/Hz 橡胶 PEEK 1 100.95 39.76 2 158.01 109.4 3 362.27 207.92 4 468.67 334.36 5 758.04 491.72
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表 5 鱼雷组件材料参数
Table 5. Material parameters of torpedo components
组件 材料 密度/(g·cm3) 弹性模量/MPa 泊松比 $\alpha $ $\beta $ 隔振圈 丁腈橡胶 1.1 5 0.4 1.4×10−5 19.84 金属橡胶 2.3 7.84 0.3 2.06×10−4 297.63 隔振垫
隔振环PEEK 1.4 8.4×103 0.38 1.3×10−5
1.5×10−44.19
50.33壳体、隔板等 结构钢 7.85 2×105 0.3 — —
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表 6 典型节点振动烈度和振动噪声
Table 6. The calculation results of vibration intensity and vibration noise of some nodes
节点编号 振动烈度/(mm/s) 振动噪声/dB 降噪效果/dB 低阻尼材料 高阻尼材料 低阻尼材料 高阻尼材料 108 1.939 342 1.277 884 105.557 4 101.928 7 3.628 637 120 1.995 689 1.332 296 105.782 8 102.248 8 3.533 955 207 1.967 842 1.312 443 105.671 4 102.132 0 3.539 351 640 1.941 273 1.331 294 105.565 1 102.242 9 3.322 186 725 1.945 700 1.353 521 105.582 8 102.373 7 3.209 151 995 1.973 407 1.383 786 105.693 6 102.551 7 3.141 945 1164 1.988 512 1.336 963 105.754 0 102.276 3 3.477 795 1242 2.012 558 1.324 683 105.850 2 102.204 0 3.646 216 3100 2.019 205 1.358 765 105.876 8 102.404 5 3.472 320 3323 2.001 042 1.352 946 105.804 2 102.370 3 3.433 897 3562 2.046 586 1.353 055 105.986 3 102.370 9 3.615 433 5845 2.033 917 1.371 620 105.935 7 102.480 1 3.455 549 6108 2.080 410 1.367 072 106.121 6 102.453 4 3.668 278 61313 2.022 758 1.393 535 105.891 0 102.609 0 3.282 005 63879 2.082 463 1.389 795 106.129 9 102.587 0 3.542 823 76879 2.086 463 1.381 234 106.145 9 102.536 7 3.609 177 92603 2.052 027 1.373 695 106.008 1 102.492 3 3.515 781 94347 2.079 145 1.335 765 106.116 6 102.269 2 3.847 376
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