81001-956-65-R
来源：厦门雄霸电子商务有限公司
发布时间：2022-08-05 14:10:17
81001-956-65-R把连续取N个采样值看成一个队列队列的长度固定为N每次采样到一个新数据放入队尾，并扔掉原来队首的一次数据(*先出原则把队列中的N个数据进行算术平均运算，就可获得新的滤波结果
N值的选取：流量，N=12；压力：N=4；液面，N=4~12；温度，N=1~4优点：对周期性干扰有良好的抑制作用，平滑度高，适用于高频振荡的系统 缺点：
灵敏度低，对偶然出现的脉冲性干扰的抑制作用较差不易消除由于脉冲干扰所引起的采样值偏差不适用于脉冲干扰比较严重的场合，比较浪费RAM五、中位值平均滤波法/防脉冲干扰平均滤波法方法：相当于“中位值滤波法”+“算术平均滤波法”，连续采样N个数据，去掉一个*值和一个*小值，然后计算N-2个据的算术平均值，N值的选取：3~14优点：融合了两种滤波法的优点，对于偶然出现的脉冲性干扰，可消除由于脉冲干扰所引起的采样值偏差缺点：测量速度较慢，和算术平均滤波法一样，比较浪费RAM六、幅平均滤波方法：相当于“限幅滤波法”+“递推平均滤波法”每次采样到的新数据*行限幅处理，再送入队列进行递推平均滤波处理优点：融合了两种滤波法的优点，对于偶然出现的脉冲性干扰，可消除由于脉冲干扰所引起的采样值偏差缺点：
比较浪费RA、一阶滞后滤波法
方法：
取a=0~1
本次滤波结果=（1-a）*本次采样值+a*上次滤波结果
优点：
对周期性干扰具有良好的抑制作用
适用于波动频率较高的场合
缺点：
相位滞后，灵敏度低，滞后程度取决于a值大小
不能消除滤波频率高于采样频率的1/2的干扰信号
In terms of computing power, computers have already surpassed human brain, but this does not mean that computers are intelligent - so far, all types of computers are still only an extension of some functions of human brain (mainly memory and operation).
In the design of PLC system, the control scheme should be determined first, and the next step is the engineering design and selection of PLC. The characteristics and application requirements of the process flow are the main basis for design and selection. The programmable logic controller and related equipment shall be integrated and standard. According to the principle of easy integration with the industrial control system and easy expansion of its functions, the selected programmable logic controller shall be a mature and reliable system with operation performance in relevant industrial fields. The system hardware, software configuration and functions of the programmable logic controller shall be compatible with the device scale and control requirements. Being familiar with programmable controllers, function charts and related programming languages is conducive to shortening programming time. Therefore, when selecting and estimating engineering design, it is necessary to analyze the characteristics and control requirements of the process in detail, clarify the control tasks and scope, and determine the required operations and actions. Then, according to the control requirements, estimate the input and output points, the required memory capacity, determine the functions of the programmable logic controller, the characteristics of external equipment, etc, Then choose the programmable logic controller with high performance price ratio and design the corresponding control system.
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