Let's talk about the advantages and disadvantages of "taking two out of three", "taking out the middle of three" and "taking the average of the three" in conservation?
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Let's talk about the advantages and disadvantages of "taking two out of three", "taking out the middle of three" and "taking the average of the three" in conservation? Under what conditions does each apply?
Two out of three is used more often, and is usually used to protect the logical judgment of the sampling signal. Most people have the final say. When one signal has a large deviation, they will misjudge that the middleman has the final say. Take the average of the three. When all three signals are normal, take the average of the three. Everyone has the final say.: )
Two out of three refers to the voting system during switch control. The same signal uses three redundant signals for voting. If two are satisfied, the conditions are considered satisfied. Often used in protection circuits. What should be done when designing is to get the best out of the three: 1. Take the middle value when normal; 2. When a point is a bad pixel or the deviation exceeds the limit, the bad pixels are automatically eliminated and the remaining two points are averaged; 3. A well-designed logic can arbitrarily specify between the specified single point value, the median value, and the average value. Commonly used in main regulating loops. Taking the average of three, you can add judgment. When the three signals are all normal, take the three average values. When one signal is abnormal, take the average of the two numbers. When two signals are abnormal, take the other normal value. This method is the most widely used in automatic adjustment. Less adoption.
Take two out of three. Many redundancies are like this. If you average, it is easy to include the error signal. For example, some signals are infinite after disconnection or according to the expression 65535. If you take the average, it is still easy to cause the above average problem. But there is still a problem with taking two out of three, that is, there is an interval. If both of them are incorrect, haha~:D
Two out of three is more commonly used, usually for logical judgment. As long as two are valid, you can get the right one out of the three. When a signal has a large deviation, it will cause misjudgment. Take the middle one that is closer to the true value and take the average of the three. When the three signals are all normal, take the three averages.
Taking two out of three is generally used in switching quantity chain control. Taking out two out of three is mainly used for analog quantities, which mainly accounts for random errors. Choosing a correct result and taking the average of three is mainly used for the average value of analog quantities, which can limit system errors. However, random errors caused by instrument failure are difficult to avoid.
Taking two out of three is for digital quantities and is used for interlocking. Using a wide range of three is for analog quantities and is used for control and regulation. Using a wide range of three and taking the average is also for analog quantities. Using the average seems fair, but it ignores the failure of field instruments and has few practical applications.