The boards and racks used in the “Spacecraft Simulation Systemâ€, in addition to the simulation boards, all adopt commercial shelf products (COTS), which reduces the difficulty of maintenance, maintenance and replacement work in the later stage; There will also be a higher performance compatible board for selection. System software and application software are also common commercial products, with long application time and a large number of use cases to ensure the reliability of the software. Due to the backward compatibility of the new version of the software, it is guaranteed that the same type of simulator can also run the algorithm of the original simulator. Because the general configuration software is adopted, the simulation algorithm of the simulator can be configured and generated, which avoids the cumbersome and error-prone programming process, and also makes the modification and maintenance of the later algorithm simple and easy. At the same time, since the generated simulation algorithm is stored in the form of a file and is called in a standard module manner, collecting the completed simulation algorithm can generate a test assembly (TPS) for later emulator calls, alleviating the same type of simulation later. The difficulty of research and development. "Spacecraft Simulation System" is developed on the basis of the original "KT8000 Universal Automatic Test Platform" technology. It adopts the same architecture and the same system and application software as the test platform. Therefore, it has good compatibility with the test platform. . When using the "KT8000 Universal Automatic Test Platform" for spacecraft testing, since the test platform downloads the test algorithm through the dispatcher, and the simulator and the test platform use the same configuration software, the Ethernet connection simulator and dispatcher are connected. The simulation algorithm can also be configured, modified and downloaded by the dispatcher, thus realizing the integration of the configuration, modification, downloading and debugging of the test algorithm and the simulation algorithm. Advantages of test simulation integration The test simulation integrated technology is used to realize the integration of the configuration, modification, downloading and debugging of the test algorithm and the simulation algorithm, so that the test system and the simulator are organically combined, which has the following advantages: (1) Using the same configuration platform, saving manpower and material resources. Since the test algorithm and the simulation algorithm can be configured, modified, downloaded, and debugged together on the dispatcher, the debug device of the simulator is saved, and the tester has the ability and condition to modify and debug the simulation algorithm. (2) When the progress of component development is delayed, the simulator can be used as a substitute to participate in system debugging. Because the simulator uses a large number of mature products and technologies, the development time is very short. When the simulation algorithm is mature, it can be used as a substitute for the simulated object in advance, and the system joint debugging is added to provide guarantee for debugging the system and other components in advance. In order to parallelize the development process of each component, the development time of the entire system is greatly shortened. (3) Synchronous control test process and simulation process. The emulator is connected to the test system via Ethernet. The dispatcher can access the emulator via Ethernet, send control commands, and read the running status. Therefore, synchronous scheduling of the test system and the emulator can be realized, and the height of the test process and the simulation process can be realized. Synchronize. (4) Simultaneous storage of simulation data and test data to achieve fitting of simulation and test data. Since the simulator and the test system adopt the same architecture and the same software, the simulator connects the test system through Ethernet, and the calculation data of the internal mathematical model can be transmitted to the server of the test system in real time, and the server compares the theoretical data of the simulator with the test system. The test data is stored synchronously and real-time fit, and the fitting curve is displayed in real time on the client of the test system. The tester adjusts the algorithm and parameters in the simulator at any time through the dispatcher, which greatly improves the correctness of the simulation algorithm and parameters. And precision. Conclusion The above test and simulation integration technology is widely used in the development of various types of spacecrafts, and has developed simulators for nearly 20 components such as earth sensors, gyro, windsurfing, momentum wheels, and telemetry remote control. The simulator has the advantages of short development cycle, stable performance, flexible use and easy maintenance. With the rapid development of test technology, simulation technology and computer technology, there will be more and better new methods, new systems and new equipment for test and simulation. These new technologies will also be more and more widely applied to various lines. In all industries, we provide support to improve labor productivity in various industries. Previous page
NSK manufacture a full range of deep groove ball bearings. These bearings are the most common type and are used in a wide variety of applications. Nsk Bearing,High Temperature Bearings,Nsk Ball Roller Bearings,Nsk Ball Bearing Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.longsbearings.com
Single-Row Deep Groove Ball Bearings
Pressed Steel Cages
Single-row deep groove ball bearings are the most common type of rolling bearings. Their use is very widespread.
In addition to open type bearings, these bearings often have steel shields or rubber seals installed on one or both sides and are prelubricated with grease. Also, snap rings are sometimes used on the periphery. As to cages, pressed steel ones are the most common.
For big deep groove ball bearings, machined brass cages are used.
Machined cages are also used for high speed applications.
Extra Small Ball Bearings and Miniature Ball Bearings
Miniature and instrument ball bearings can be divided into two basic types, deep groove and angular contact. The first (deep groove) can be further divided into the following five classes depending on their design details:
Standard type
Flanged outer ring
Extended inner ring
Expanded type in which one ring has a radial thickness that is larger than normal compared with the bearing width.
Thin section type in which both rings are extra thin in the radial direction. They can also be classified as: open, shielded, or sealed.
Maximum-Type Ball Bearings
Maximum-Type ball Bearings contain a larger number of balls than normal deep groove ball bearings because of filling slots in the inner and outer rings. Because of their filling slots, they are not suitable for applications with high axial loads. types of bearings have boundary dimensions equal to those of single-row deep groove ball bearings of Series 6200 and 6300 respectively. Besides the open type, ZZ type shielded bearings are also available. When using these bearings, it is important for the filling slot in the outer ring to be outside of the loaded zone as much as possible. Their cages are pressed steel.