| 何林涛,任建峰,张克非,彭磊.一种连接器振动故障分析[J].装备环境工程,2023,20(1):30-36. HE Lin-tao,REN Jian-feng,ZHANG Ke-fei,PENG Lei.Vibration Fault Analysis for a Connector[J].Equipment Environmental Engineering,2023,20(1):30-36. |
| 一种连接器振动故障分析 |
| Vibration Fault Analysis for a Connector |
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| DOI：10.7643/issn.1672-9242.2023.01.005 |
| 中文关键词: 机载电子模块 连接器 随机振动 振动疲劳寿命 频域法 摩擦 高斯区间法中图分类号:V215.5 文献标识码:A 文章编号:1672-9242(2023)01-0030-07 |
| 英文关键词:airborne module connector random vibration vibration fatigue life frequency domain method friction Gaussian interval method |
| 基金项目:国防基础科研计划(JCKY2020210B009) |
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| 中文摘要: |
| 目的 分析得出轴向弹性触碰式连接器内导体失效的主要原因。方法 以某机载电子模块的连接器在功能振动试验后出现的故障为研究对象，对其进行目测检查、随机振动仿真分析和受力分析，定位故障原因，随后结合应力应变关系公式、高斯区间法和Miner累积损伤定律，推导内导体的疲劳寿命计算公式。结果 计算得到内导体自身的振动响应应力仅为0.26 MPa，不足以产生疲劳破坏，但在振动激励下，连接器随模块的振动位移较大，超出了连接器的间隙容差范围，致使受压的内导体端面出现较大的往复动摩擦力，而摩擦力引起内导体根部的应力(250.13 MPa)超过了材料的疲劳极限，内导体有疲劳断裂的风险。进一步计算出内导体的振动疲劳寿命为0.67 h，小于功能振动试验时间，证实是振动位移引起的摩擦导致了内导体的疲劳断裂。结论 轴向弹性触碰式连接器必须要重视摩擦力的危害，提高模块的安装刚度，可以有效地提高连接器的可靠性。 |
| 英文摘要: |
| The work aims to analyze the main causes for failure of conductors in axial elastic contact connectors. With the failure of the connector of an airborne electronic module after functional vibration test as the research object, visual inspection, random vibration simulation analysis and force analysis were conducted to locate failure causes. Then, the fatigue life calculation formula of inner conductor was derived in combination with the stress-strain relation formula, the Gauss interval method and the Miner's cumulative damage law. The result showed that the vibration stress of the connector’s inner conductor was only 0.26 MPa, which was not enough to cause fatigue damage to the connector. However, under the vibration excitation, the connector had a large vibration displacement with the module, and the displacement exceeded the gap tolerance range of the connector, which caused a large reciprocating friction on the pressed end face of the inner conductor. The stress (250.13 MPa) on the root of the inner conductor which caused by friction exceeded the fatigue limit of the material, therefore the inner conductor had the risk of fatigue fracture. On this basis, the vibration fatigue life of the inner conductor was calculated to be 0.67 h, which was less than the functional vibration test time. The above results confirmed that the fatigue fracture of the inner conductor was caused by friction force of the vibration displacement. Attention must be paid to the harm of friction on axial elastic contact connectors. The reliability of connectors can be improved effectively by increasing the installation stiffness of modules. |
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