The factors that should be considered when using a redundant system for a basket type thermal shock tester are as follows:
1) Reliability can be improved by using a redundant method, but it is not applicable in any situation. For example, the cause of failure is caused by overload, and redundancy does not necessarily solve the problem: components that work under strong vibrations and use redundant methods to improve reliability are useless. Therefore, consider the use of redundant systems and the failure mechanism of the system.
(2) If a unit is complex in structure, large in size, and expensive, it is obviously uneconomical to use multiple parallels to improve system reliability. It is better to take improvement measures to improve unit reliability. So redundancy technology is not the only way to improve system reliability.
(3) In actual work, there is also a method of non-operational redundancy using a manual system, that is, after a system fails, a manual operating system is used to make another standby system work. This method eliminates the need for advanced detection and conversion systems. Although it is not advanced enough, it is generally adopted, especially in automatic control systems.
(4) Under special conditions, "warm storage" can be used. It is a redundant method between work redundancy and non-work redundancy. For example, in a satellite first-stage propulsion unit, a six-tube liquid fuel rocket can meet the requirements. But considering the reliability of the engine is not high enough, it works with 8 tube rockets. Since the detection conversion device is used in flight, it is too late and the reliability is lowered. Therefore, the eight engines were loaded with six units from the beginning, so that the output power of eight units was equal to the output power of six units. When one of the aircraft fails, the faulty engine is immediately shut down and the thrust of the other rockets is automatically increased. This method is called "warm storage." Let the probability of success of the engine being promoted normally be Po, and P1 and P1 >P when the load is reduced. .
(5) It should be considered to apply redundancy technology in the weak link. It is extremely uneconomical to use redundant methods of reconfiguring subsystems or systems. Whenever possible, the redundancy of weak links, such as important but easy-to-fail command channels, should be considered. Turning a single line into a double line improves reliability and the like.
(6) Finally, it should be clarified that regardless of which redundancy method is used, the actual needs of the equipment need to be considered, taking into account the volume, weight, allowable development cycle and funding issues. In particular, the cost problem, the more redundant the number, the more complicated the system, the more the funding increases, and there is a linear relationship between them. The system failure rate decreases with increasing redundancy and is much faster than the linear relationship. Therefore, in practical applications, we must balance the two factors.
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