Abstract: This paper presents a linear approximation method for the steadystate thermal vacuum test system model, and a kind of algorithm for the online joint estimation of time delay and parameters in a class of time varying systems. An adaptive poles assignment controller and compensator are designed with estimated time delay and plant parameters. The system response performance for a given temperature trajectory in tests is greatly improved.

Key words: vacuum thermal tests, delay time estimation, system identification, poleplacement assignment, trajectory control, adaptive compensator