Optimization design for vibration environmental adaptability of coaxial pulse forming line
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摘要: 以带有悬臂结构的同轴脉冲形成线为研究对象，开展提高振动环境适应性的优化设计。首先，通过实际工况分析及仿真计算，确定形成线内筒的盲孔螺钉可采用的防松措施有：使用施必劳螺纹并涂抹防松胶；优化螺钉数量。其次，通过仿真分析和绝缘试验，优化尾端绝缘子材料，提高悬臂支撑的中内筒连接刚度。最后，开展振动试验考核，优化后的形成线等效件可以通过长时间的振动考核，相比优化前的振动环境适应性有很大提高，验证了优化设计的有效性。该研究结果对同类型脉冲功率源的振动环境适应性设计具有参考意义。Abstract: Taking the coaxial pulse forming line (PFL) with cantilever structure as the research object, we carried out an optimization design for improving the vibration environmental adaptability. Firstly, through the analysis of the actual working condition and simulation calculation, the available anti-loosening measures for the blind hole screw in the inner conductor were determined as follows: using spiralock thread, applying anti-loosening glue and optimizing the number of the screws. Secondly, the insulator material was preferred to improve the connection stiffness of the inner conductor and the middle conductor according to the simulation analysis and the insulation test results. Finally, the vibration test was carried out to verify the effectiveness of the optimization design. The result show that the optimized equivalent parts of PFL could pass the long-term assessment, indicating that the vibration environment adaptability was greatly improved. The research results have reference significance for the vibration environment adaptability design of the same type of pulse power source.
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图 4 中内筒螺纹连接的有限元模型
Figure 4. Finite element model of middle conductor and inner conductor connected by screws
表 1 中内筒连接螺钉谐响应计算结果
Table 1. Harmonic response calculation results of screws for connecting middle conductor with inner conductor (vertical vibration)
condition maximum axial force/kN maximum shear force/kN 6 screws 21.54 3.96 8 screws 14.18 2.96 
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表 2 绝缘测试结果汇总
Table 2. Summary of insulation test
material electric field value of bulk breakdown/(kV·mm−1） electric field value of surface flashover/(kV·mm−1） PEEK 41.4 13.9 glass fiber reinforced PEEK 38.9 12.1 nylon 66 33.8 11.1 glass fiber reinforced nylon 66 19.3 7.1
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表 3 不同弹性模量的模态计算结果
Table 3. Modal calculation results with different elastic modulus
number modal shape inherent frequency/Hz elastic modulus of 3.6 GPa elastic modulus of 8 GPa 1 lateral bending of inner conductor 32.86 45.78 2 vertical bending of inner conductor 32.63 42.9 3 twisting of inner conductor 42.88 46.03 4 bending of inner conductor along the axial direction 55.89 65.73
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表 4 优化设计前后振动试验考核结果对比
Table 4. Comparison of vibration test results before and after optimization design
test condition direction before optimizing after optimizing condition 1 longitudinal 40 min with full order of magnitude 2 h with full order of magnitude lateral 30 min with full order of magnitude 2 h with full order of magnitude vertical 30 min with full order of magnitude 2 h with full order of magnitude condition 2 longitudinal 10 min with full order of magnitude 40 min with full order of magnitude lateral 10 min with full order of magnitude 40 min with full order of magnitude vertical 10 min with full order of magnitude 40 min with full order of magnitude condition 3 three direction 5g 20g
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表 5 安装不同材质尾端绝缘子时中筒尾端响应结果
Table 5. Response results of middle conductor with different insulator materials
test condition response with PEEK response with glass fiber reinforced PEEK longitudinal frequency sweep 0.59g@38.1 Hz 1.38g@39.4 Hz longitudinal wheel vehicle transportation (condition 2) 1.10g, RMS 1.90g，RMS lateral frequency sweep 1.87g@24.6 Hz 1.31g@32.1 Hz vertical frequency sweep 1.23g@23.6 Hz 0.52g@37.9 Hz vertical wheel vehicle transportation (condition 2) 2.73g, RMS 2.60g, RMS
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