# What is Process control: Definition and 13 Discussions

An industrial process control in continuous production processes is a discipline that uses industrial control systems to achieve a production level of consistency, economy and safety which could not be achieved purely by human manual control. It is implemented widely in industries such as automotive, mining, dredging, oil refining, pulp and paper manufacturing, chemical processing and power generating plants.There is a wide range of size, type and complexity, but it enables a small number of operators to manage complex processes to a high degree of consistency. The development of large industrial process control systems was instrumental in enabling the design of large high volume and complex processes, which could not be otherwise economically or safely operated.The applications can range from controlling the temperature and level of a single process vessel, to a complete chemical processing plant with several thousand control loops.

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1. ### Engineering Sinusoidal response to sinusoidal input (Process control)

This a homeawork from my graduate course. I know that a sinusoidal input affects both the amplitude and phase of the response, but I don't know how it does. I'd be really glad if someone could help. Thanks
2. ### Engineering Calculating valve sizes for a compressible liquid

I have converted given pressures from bar gauge to bar abs Inlet pressure = 20 - 1.013 = 21.013 bar abs Outlet pressure = 6 + 1.013 = 7.013 bar abs therefore pressure drop (x) x = {p_1 -p_2 \over p_1 } = {21.013 - 7.013 \over 21.013} = 0.6662542236 bar abs Comparing to the chart values for...
3. ### Engineering Thermodynamics: Pass-out Turbine Question

Hello Physics Forums, I have been struggling with this question for some time now and I'm not sure my method is correct - please see attached. Any help you can give to check I'm on the right lines would be very much appreciated! Cheers, C
4. ### Operational Amplifiers & Resistors to form a Black Box

So basically I am trying to give an output of Vo = 10(V2-V1) From Figure 9 Example Gain of first Op Amp = Rf / R1, if R1 & R2 are equal. What's throwing me off is using 5 resistors to create a circuit rather than 6 or just 3. My initial thoughts were the following: To use the first loop...
5. ### Engineering Tuning Rules for Lag Dominated FOPDT (first-order plus deadtime) model

I am trying to find an alternative tuning rule for use with the transfer function specified. Please could someone help by pointing me in the right direction, thanks. Process transfer function: ## \frac {27e^{-3s}} {30s+1} ## Also, am I right in thinking that this process transfer function is...
6. ### Tank Change in Flow Process Modeling

Hi All, I'm really struggling with the below question - I'm not sure if I've taken the correct approach to determining the model as there may be an easier way to do this? Any help in much appreciated, please let me know if I have submitted this template correctly as this if my first time...
7. ### I Transfer Function relating momentum and force

Hey all, I hope this is the correct forum section to post this in. I heard about this problem from a youtube video but I've not been able to simulate it because the video was meant only for an introduction into PID control. Here's the problem: A remote control helicopter is hovering just...
8. ### Process Control/Direct Synthesis

Homework Statement Hi everyone, I am so stuck in this one homework problem. Any help is greatly appreciated The question asks to use direct synthesis to design a controller for the transfer function below. The desire closed loop time constant is 1 Homework Equations (-s+1)*e^(-s)/(5*s+1)^2...
9. ### Types of signals in process control

Hello, PF! I've been learning some process control on my own lately, and some questions have come to my head while on it. Consider the following on-off control loop: Let's say we want to control the temperature of the fluid inside the tank. We set up an on-off control loop and establish a...
10. ### The angular velocity of a process control motor is (21−(1/2t^2)) rad/s

Homework Statement The angular velocity of a process control motor is (21−(1/2t^2)) rad/s, where t is in seconds. 1.) At what time does the motor reverse direction? 2.) Through what angle does the motor turn between t =0 s and the instant at which it reverses direction? Homework Equations...
11. ### Need Help Understanding Process Control System?

i have problem to understand the concept of process control system... anyone can help me to find source or link that related?
12. ### Implementing critically damped in a process control system.

Doing a Cascade Control lab and I'm stuck on a question. Its asking me how to implement critically damped into a control system. I can't find it any where in my books or the net. thanks.
13. ### Optimizing Process Control: Calculating Mass Flow Rate for Natural Gas Ignitors

Neglecting friction: I have a four inch diameter pipe that has a constant 8 psi input of natural gas(It is regulated and any psi drop throughout the pipe are negligable in this situation). I found a site to tell me that the avg natural gas density is 0.4445 kg/m^3 at .06 MPa which I...