环境试验设备的状态空间法仿真设计

对于环境试验设备的设计,传统的工程设计方法是从指标出发,用半经验、稳态的方法设计系统,按照围护结构稳态放热量和试品冷透来计算制冷系统容量,这种稳态的计算结果通常比实际需要大的多.采用基于状态空间描述的分布参数模型用于系统动态仿真,可以允许对许多先不必要考虑的环节简化处理,对主要的负荷如围护结构、被试品等做精确的处理,可以较准确的得到总的制冷量需求,验证控制策略等,对于初期方案设计中系统制冷、加热设备容量的准确计算、不同方案的验证、控制方案的制定具有明显的意义.

Simulation design based on state-space for environment test equipment

To calculate the system capacity accurately in environment test equipment design, a simulation scheme was introduced. This scheme was based on distributed parameter model and the model was expressed in state space. In the traditional design, refrigeration of loading was regarded as completeness at the end of refrigeration course. As a result, the system capacity is calculated much greater than the actual need. Compared with traditional design, the simulation design scheme is more accurate in system capacity calculation. The simulation scheme can be applied to test and compare different control scheme too. It is of distinct meaning and efficiency in the initial design stage.