WTO harmonization and HS codes

List of contents of this article:

• 1
  、Adjust the impact of pid parameters on the single-capacy water tank
• 2、single capacity water tank liquid level PID control system
• 3,WTO harmonization and HS codes What is the difference between the double-capacity water tank system liquid level pid control system and the single-capacity water tank system
• 4, How to evaluate the performance of a single-capome liquid level system?

Adjust the impact of pid parameters on the single-capace water tank

Qualitatively analyze the impact of parameter changes of P, PI and PID regulators on system performance.

Proportional adjustment effect proportionally responds to the deviation of the system. Once there is a deviation in the system, the proportional adjustment immediately produces a regulating effect to reduce the deviation. The proportional effect is large, which can speed up the adjustment and quickly respond to the error, so as to reduce the steady-state error. However, proportional control cannot eliminate steady-state errors.

The function of proportional parameter KP is to accelerate the response speed of the system and improve the adjustment accuracy of the system. With the increase of KP, the faster the response speed of the system, the higher the adjustment accuracy of the system, but the system is prone to overmodulation, the stability of the system becomes worse, and even leads to system instability.

PID control includes three links: proportional link P, integral link I, and differential link D.One or two of them can be used, or all three can be used, depending on the characteristics of the process and the control requirements. Proportional link P: The output of the controller is proportional to the input error signal.

Differential time (Td): Differential time is the third parameter in the PID controller. It determines the degree of influence of differentiation on the rate of error change. Differential action can inhibit the oscillation and oscillation of the system, making the system more stable.

The control of this derivative will respond to the changes in the system. The larger the result of the derivative, the faster the control system responds to the output result. This D parameter is also the reason why PID is called a predictable controller. The D parameter is very helpful to reduce short-term changes in the controller.

Single capacity water tank level PID control system

1. The experimental purpose of the single capacity water tank level PID control system is to familiarize yourself with the composition and working principle of the single-loop feedback control system through the experiment. Study the step response when the system uses P, PI and PID regulators respectively. Research the anti-disturbance action when the system uses P, PI and PID regulators respectively.

2. The impact of adjusting pid parameters on a single-capacitance water tank is as follows: Proportional coefficient P: The larger the proportional coefficient, the greater the impact on the water tank temperature, and the response speed of the control system will also be accelerated, but an excessive proportional coefficient may cause system shock or instability.

3. Dual-capacity sink is a common control object in the industrial production process. It is composed of two self-balancingThe single-capacity sink is connected in series, which usually requires fixed control of the lower sink level. The lower sink level in the double-capacity sink is the controlled amount in this system, and the inlet flow of the upper sink is usually selected as the manipulation amount.

What is the difference between the liquid level pid control system of the dual-capacitance water tank system and the single-capacitance water tank system

The single-capacitance liquid level control system has only one storage tank, so there is no lag effect, sound It should be faster and easier to achieve stable control.

Integral effect is enhanced. The enhancement of the integral effect makes the system unstable and becomes a second-order system, and the output may oscillate, which makes the dual-capacitance liquid level control system more difficult to stabilize than the single-capacity liquid level control system. The proportion should be increased while the integral action is enhanced.

Because the double volume is equivalent to the series of two single volumes, it becomes a second-order system, and the output may oscillate. The single volume is a first-order system, and the output is exponentially monotonous.

The impact of adjusting pid parameters on the single-capacity water tank is as follows: Proportional coefficient P: The larger the proportional coefficient, the greater the impact on the water tank temperature, and the response speed of the control system will also be accelerated, but an excessive proportional coefficient may cause system shock or instability.

The single-volume liquid level system is a simple liquid level control system, and its performance evaluation can be carried out from the following aspects: Stability: The stability of the single-volume liquid level system depends on the parameters of the system, such as the density of the liquid, the size and shape of the container, the speed of liquid level change, etc.

Stability. According to the query of Baidu education information, the performance indicators of the single-capomer liquid level system include stability, control accuracy and response speed.Dual-capacity liquid level system is a common control system in industrial production, which is used to control the liquid level between two storage tanks.

How to evaluate the performance of a single-capome liquid level system?

The methods to evaluate the performance of the system are: stability, accuracy and response speed.Stability: How is the liquid level stability of the single-capacitance liquid level system under different working conditions, and whether there will be liquid level fluctuations, instability, etc. Accuracy: Whether the liquid level measurement of the single-capome liquid level system is accurate, and whether there will be a large measurement error.

Stability. According to the query of Baidu education information, the performance indicators of the single-capomer liquid level system include stability, control accuracy and response speed. Dual-capacity liquid level system is a common control system in industrial production, which is used to control the liquid level between two storage tanks.

The single-capacitive liquid level control system has the characteristics of nonlinearity, lag, coupling, etc., and can simulate the characteristics of industrial processes very well.

The experimental purpose of the single-capacity water tank liquid level PID control system is to familiarize yourself with the composition and working principle of the single-loop feedback control system through experiments.Study the step response when the system uses P, PI and PID regulators respectively. Research the anti-disturbance action when the system uses P, PI and PID regulators respectively.