【摘要】 针对空调器包装运输过程中的断管问题,通过数值分析和实验建立一种空调室外机运输振动疲劳可靠性评价方法。基于Palmgren-Miner线性疲劳累积损伤理论及高斯分布三区间法则,研究了空调管路运输过程随机振动疲劳寿命的预估方法。通过模态分析、随机振动仿真分析,并运用疲劳寿命预估方法结合空调用铜材的S-N曲线对管路的疲劳寿命进行了验算;通过雨流计数法统计随机振动试验应力峰值概率密度分布区间阈值,并与仿真结果对比,验证仿真结果准确性。结构表明:模态和随机振动分析结果和试验结果较吻合,空调配管的排气第1弯疲劳累计损伤系数达到15.743,排气第2弯达到2.255,吸气第1弯达到4.423,超出了铜管的疲劳累积准则,配管存在疲劳失效的隐患。4 h的随机振动实验发现排气第1弯出现裂缝,验证了数值分析结果的准确性。空调管路随机振动疲劳可靠性评价方法,准确度较高,实现了工程化运用,能够给业内人士提供参考。更多还原

【Abstract】 For the problem of pipe breakage of air conditioners during the transportation,a method for evaluating the reliability of air conditioner transportation vibration fatigue was established through numerical analysis and experiments.Based on the Palmgren-Miner linear fatigue cumulative damage theory and the Gaussian distribution three-interval rule,the method for predicting the fatigue life of air conditioner pipe is studied under random vibration.Through model analysis and random vibration analysis,the fatigue life of the pipeline is checked by the fatigue life prediction method combined with the S-N curve.At last the probability density distribution interval threshold of the stress peak of the random vibration test is measured by the rain flow counting method and the simulation results are compared.The results show that:the modal analysis and random vibration analysis results are consistent with the experimental results.Air conditioner piping exhaust first fatigue cumulative damage reached 15.743,exhaust second bend to 2.255,suction first bend to 4.423 which beyond the copper pipe fatigue damage criteria.And the piping exist the risk of fatigue failure.After four-hour random vibration experiment,a crack has been found in the first bend of the exhaust which validated the numerical results.The reliability evaluation system of random vibration fatigue reliability evaluation system of air conditioner has high accuracy,and its engineering application is realized,which can provide reference for industry people.更多还原