长周期波动 meaning in Chinese

long period fluctuation
long term cyclic fluctuation
long-period fluctuation

With this experimental system , the influence of short cycle fluctuation of the space environment on thermal control system is investigated and the method that reducing the experimental simulation time is tried and analyzed . the experimental results are used to validate the numerical emulational platform
利用该系统，本文实验模拟了热辐射环境的短周期波动对热控制系统造成的影响，用压缩周期的方法模拟了热辐射环境长周期波动的影响并进行了分析。
This platform is then used to study the temperature distribution and fluctuation of module ' s wall , the fluctuations of thermal control system , temperature and humidity in the cabin for the short and long cycles of the thermal environment changes . this thesis suggests a temperature control method for cooling loops , a temperature and humidity control method of the cabin air and simulates their effectiveness
用该平台仿真了舱壁的温度分布及波动特点，研究了热辐射环境的短周期和长周期波动及舱内热负荷波动对热控制系统及舱内空气温度、湿度造成的动态影响；给出了热控回路温度控制方法，利用最佳去湿流量的概念提出了具有回热流程的舱内空气温度、湿度控制方法，对控制效果进行了动态仿真。