The Design Of Satellite Simulative SADA Test System

In order to check performance of the Components of satellite, plenty of ground modeling and simulation tests must be carried out before launching. The modeling method includes mathematical modeling and physical modeling. Physical modeling can be divided into whole simulation and partial simulation.Partial modeling simulates a certain part of satellite and do research on ground. Such as satellite’s solar array (SA) and related components. SA is generally the largest flexible structure of the satellite, it is easy to vibrate. Moreover, under the environment of no air damping space, once the vibration is evoked, it is difficult attenuating naturally. Vibration will bring unpredictable result of satellite’s running and safety. Therefore, it is necessary to make experiments on the factors which may cause vibration of SA. This paper mainly concentrates on speed vibration of solar array drive assembly (SADA), proposes an intact testing system for simulation test on the ground.First of all, the paper thoroughly analyzes the principles of SADA based on the existing simulation test equipment. If SADA’s revolving speed is not stable, it will make speed change abruptly when adjusting SA’s direction, vibration will be caused. However, the key factor of ground test is simulating the weightless environment as truly as possible, for example, zero gravity. Simulating zero gravity has two ways:hanging and air flotation. Hanging will produce extra friction and torture, which is appropriate for static environment or small scale movement simulation. In contrast, air flotation is used more widely and researched more profoundly. So the test plan is based on the single-shaft air flotation system. Using multidimensional force sensor and acceleration sensor to acquire data and intelligent acquisition card based on FPGA of the National Instruments Company to processes data.Secondly, designs system’s hardware of test equipment. The equipment needs to versatility to make sure different types of SADA can carry out the experiments. Meanwhile, moment of inertia and frequency of various types SA should be simulated. Therefore, a theoretical models have been simulated before the whole set of equipment were processed and manufactured, include three-dimension modeling of parameter and finite element analysis, making sure the key parameters can meet actual requirements.Then, it carries out designs and researches of the software about test system, Using LabVIEW achieving the function of signal acquisition based on high quality FPGA module. Develops low position FPGA program, communication interface program and the host computer program. Making host computer contains functions of data processing, waveform analysis, data display and preservation.Finally, it carries out debugging and experimenting of the integrated system. Use signal data filter and frequency analysis method to analyze experimental data and Vivificate the function of test equipment.