KEYWORDS: Satellites, Data analysis, Vibration, Design and modelling, Data storage, Data conversion, Data acquisition, Control software, Vibration control, Software development
In order to solve the problem of consuming a lot of time in data analysis, condition formulation and summary report compilation of satellite mechanics test, a set of software for data analysis of satellite mechanics test was developed. Firstly, the system framework is constructed from the process of satellite vibration test. Then, the functions of the software are divided by sorting out each link of the test data analysis. In addition, according to the flow of data in the test, design the engineering data structure. Finally, combined with the characteristics of data interaction and convenient use of the software, a general module of the software is constructed.
KEYWORDS: Vibration, Data modeling, Data conversion, Thermal modeling, Satellites, Temperature distribution, Space operations, Thermal deformation, Analytical research, Temperature metrology
According to satellite structure with slender rods or thin-walled, drastic temperature changes on orbit cause structure vibration, and further thermal vibration and even thermal induced bending vibration. The paper describes a thermal machine two-way coupling analysis developed based on existing commercial software. A flexible structure was analysis using the method. The analysis results indicate the amount of displacement of the flexible structure on orbit changes over time providing a reference for the follow-up work. The thermal machine two-way coupling analysis proposed in the paper provides a new idea for thermal induced bending vibration analysis of the flexible structure of satellites.
In order to improve the fatigue evaluation system of the satellite in the transportation environment, a fatigue analysis method of satellite transportation environment based on the digital twin was explored in this paper. At first, the basic theories and method of fatigue analysis are introduced in detail. The fatigue damages of the satellite in the transportation environment are evaluated by using the random vibration and sinusoidal vibration stress fatigue analysis separately. And then, digital twin fatigue models based on the acceleration response of random vibration and sinusoidal vibration are established. Finally, fatigue models are utilized to analyze the fatigue damage to the satellite in the transportation environment and are compared with the stress fatigue models before. The results show that all the fatigue damage keeps in accordance with each other verifying the accuracy of the fatigue model based on the digital twin presented in this paper.
In order to further improve the measurement precision of the star sensor and solve the problem on displacement field construction for on-orbit star sensor mounting bracket. In this paper, star sensor mounting bracket is simplified, and the theoretical formula on the displacement field of the star sensor mounting bracket is constructed based on beam bending theory, curvature recursive method and the least square method. Secondly, fiber Bragg grating sensors are embedded in the key nodes of the star sensor mounting bracket, and the strain of the star sensor mounting bracket is measured by the static test. Then, the displacement field of the star sensor mounting bracket is constructed based on the strain test data, and combined with the theoretical formula for the displacement field. Finally, comparing the measured data of displacement mete with the constructed displacement field values and static simulation results, the feasibility and accuracy of the method on constructing the displacement field of star sensor mounting bracket by using embedded fiber Bragg grating for strain monitoring is further verified.
In order to formulate accurate and reasonable random vibration test conditions for optical cameras and solve the problem of conservative design of test conditions caused by inaccurate simulation calculation, this paper proposes a general method for the design of random vibration specification for small satellites’ optical cameras. First, we derive the dynamic response formula, which lays a foundation for the small satellite dynamic simulation calculation. Then, the response of the optical camera mounting surface, which is obtained by the dynamic calculation of the small satellite finite element model, and the random vibration test conditions of the camera process is enveloped to obtain the preliminary random vibration test condition of the new research optical camera. Subsequently, we combine the random vibration test data of the optical remote sensing satellite, which has been used in orbit, and revise the preliminary random vibration test conditions of the new research camera in terms of response magnitude and frequency. Finally, we verify the rationality of this method through random vibration test of a small satellite. This scheme is conducive to the establishment of more reasonable and feasible random vibration test conditions for small satellites’ optical cameras, which is beneficial to the development and production of optical cameras.
Optical remote sensing is widely used in relief and military affairs. However, its detection ability is limited by the contrast between target and background. Polarization imaging detection is different from traditional intensity detection methods. It can effectively detect and identify polarization pattern obvious targets with low contrast, but it has some shortcomings such as large system volume, complex system design and low light efficiency. Therefore, a polarization detection method based on dynamic vision sensor (DVS) is proposed in the paper. The feasibility of the method is studied and analyzed here. A simple experimental system based on DVS and rotating polarizer is built. Moreover, both indoor and outdoor experiments are carried out separately. The results show that our method can effectively detect the targets with different degrees of polarization (Dop) in the scene, and has the advantages of high sensitivity, intuitive detection and small physical size. It holds the potential applications in the field of remote sensing based man-made targets detection.
Due to the military and commercial demands, space activities have become more frequent, and the exploration of the space around the world has been accelerating. The demand for high-speed data communications has prompted the development of satellite laser communication technology. Satellite laser communication has the advantages of large communication capacity, low transmitting power, long transmission distance, strong anti-electromagnetic interference capability and high security, which makes it gradually become an important direction for the development of space backbone network. Satellite laser communications terminals continue to become miniaturized volume, light weight and low power consumption, which makes it possible for small satellites applying laser communications technology. This paper introduces the development history and latest research progress of satellite laser communication in foreign countries, and the development status of domestic satellite laser communication, and summarizes some inspirations for the development of satellite laser communication technology.
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