数值模拟建模已经成为产品设计过程中一个非常重要的组成部分。暖通空调系统的重要产品可靠性风险之一是制冷管道系统的振动疲劳失效。制冷剂管路过度振动最终可能导致裂纹或接头故障，以及制冷剂加注量损失。振动由压缩机驱动，压缩机由动态负载组合激发，例如转子不平衡和与压缩过程相关的压力脉动。当激励频率与管道共振（也称为“固有频率”或“模式”）一致时，会出现管道系统问题。为了降低这种风险，使用有限元分析（FEA）进行数值模拟，以计算管道共振及其相关应力水平。使用数值模型，可以识别潜在的共振问题，并在制造原型装置之前完善管道系统设计。 本文介绍了有限元模拟过程的描述，包括关键建模假设，以及模型如何与测试相关的示例。生产单位统计数据证实，振动模拟可以显著降低疲劳失效的风险。引用:德克萨斯州达拉斯ASHRAE会议论文。

Numerical simulation modeling has become a very important and integral part of product design process. One of the significant product reliability risks for HVAC systems is vibration fatigue failure of refrigeration piping systems. Excessive refrigerant line vibration can ultimately result in cracks or joint failures, and loss of refrigerant charge. The vibration is driven by compressor, which is excited by a combination of dynamic loads, such as rotor imbalance and pressure pulsations associated with the compression process. Piping system problems arise when the excitation frequencies coincide with piping resonances (also called "natural frequencies" or "modes"). To mitigate this risk, numerical simulation using Finite Element Analysis (FEA) is conducted to calculate piping resonances and their associated stress levels. Using numerical models, it is possible to identify potential resonance problems, and refine the piping system design prior to making prototype units. This paper presents a description of the FEA simulation process, including key modeling assumptions, as well as examples of how the models correlate with test. Production unit statistics confirm that vibration simulation can significantly reduce the risk of the fatigue failure.