基于粒子群优化最小二乘支持向量机的离心式制冷机故障诊断

Fault diagnosis of centrifugal chillers based on particle swarm optimization-least squares support vector machine

针对制冷系统传统故障诊断正确率低的问题,引入最小二乘支持向量机(LSSVM)算法用于制冷系统故障诊断。在LSSVM模型基础上,结合粒子群优化(PSO)得到PSOLSSVM模型,利用特征选择方法优化得到LSSVM8模型,利用组合方法得到PSO-LSSVM8模型。分析比较了4种模型的诊断性能。结果表明:PSO-LSSVM模型、LSSVM8模型均可改善基于LSSVM模型的制冷系统故障诊断性能,尤其是对于制冷剂泄漏/充注量不足故障,准确率分别提高1.04%,1.24%;PSO-LSSVM8模型比采用单种优化方法的诊断模型具有更好的诊断性能,可克服人为选择参数的盲目性,在全局优化与收敛速度方面具有较大优势,应用于制冷系统故障诊断具有较好的可行性。

Aiming at the low accuracy rate of traditional fault diagnosis in refrigeration system, presents the least squares support vector machine （LSSVM） algorithm for the fault diagnosis field of refrigeration system. Based on the LSSVM model, obtains the PSO-LSSVM model by combining the particle swarm optimization （PSO） algorithm, the LSSVMs model by the feature selection method, and the PSO-LSSVM8 model by the combination method. Analyses and compares the diagnostic performance of the four models. The results show that the PSO-LSSVM model and LSSVM8 model can improve the performance of the fault diagnosis of the refrigeration system based on the LSSVM model in different aspects, especially for the failure of the refrigerant leakage/filling, and the accuracy rate increases by 1.04%, 1.24% respectively, and the PSO-LSSVM8 model has better diagnostic performance than the single optimization method, it can overcome the blindness of artificial parameters selection, with great advantages in the comprehensive optimization and convergence speed, which has good feasibility in the fault diagnosis of the refrigeration system.