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What type of control system is this? open loop?
Suppose I have a liquid in a container, the type of liquid is such that it expands when its temperature rises. The contrainer is marked with scale to measure the height of liquid expanded. There is a...
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Calculating a derivative in a loop?
I am not sure where else to post this, so here goes. I have a velocity profile ($v_{\phi}$) for a radial distance ($r$). From this velocity profile I am trying calculate the shear rate ($y$) which can...
View ArticleFinding stability of open loop system connected to closed loop system
I have a simple cruise control closed-loop system with negative feedback and have no problem using the Nyquist stability criterion to find its stability. However, I have another function that...
View ArticleHow to improve a PID control loop by adding feedforward?
Assume you have a system model that is controlled by a PID controller (feedback). You want to add feedforward to improve the characteristics of the controlled system. How can you design the transfer...
View ArticleCan a PID controller have a simple on/off output?
The crux of a PID controller is:- output = Kp * error + Ki * integral + Kd * derivative So typically there is proportionality and a continuously varying (analogue) output. In the case of a simple...
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What 's the function of COMP pin(Pin 3) in LM5030 - Push Pull IC?
I'm a student. Now, I am learning to use LM5030 IC to design a Push-Pull converter. So, I read LM5030's datasheet and can not understand the function of COMP pin (Pin 3). The red line is Feedback...
View ArticleHow to repeat on ABAQUS FEM simulations without reloading the mesh?
I would like to perform several FEM simulations on a given mesh with ABAQUS, where only the orientation of an element set would change in between.Currently, I'm just generating several inp files (see...
View ArticlePhysical interpretation of a Bode plot
I have a few questions regarding the physical interpretation of the information presented on a Bode plot. I believe it is one of those cases where I "don't know what I don't know", so please bear with...
View ArticleLow accuracy current feedback measurement in motor control
Given a very low accuracy current sensor in a 3 phase inverter (in my case used for motor control) what is the best way to tackle the issue and keep reasonable performance and robustness at the same...
View Articlemass-friction-spring system with closed loop
My professor told us that it is possible to see the friction in a mass-friction-spring as the contribution of a closed loop control system. He wrote the following formulas:Transfer...
View ArticleCrossflow HX tube and fin, derive Tout hot side as a function of mdot hot...
Apparatus:Crossflow Tube and fin HX. (liquid-to-air Intercooler),Hot Side: Tube side, gas flowing internallyCold Side: fin side, water flowing in crossflowGoal:Generate an environment in "OpenAI gym"...
View ArticleTuning Feedforward + PID Controller just with Feedforward Data
Hello there, hope you are all doing well.Right now I am trying to design a Feedforward + PID Controller for KUKA youBot on simulation. Since I do not have the equation of the system, I am trying to...
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How can I get final value of $V_{out}$ at $t=∞$ in RC circuit?
I can obtain the transfer function in this RC circuit.$$ \frac{V_{out}}{V_{in}} = \frac{1}{(RCs+1)} $$When $V_{in}$ is set to $10V$, how can I get final value of $V_{out}$ at $t=∞$?I tried to use the...
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Feedback loop and zero - error in steady state
I need help with this exercise. I 've tried many times with pen and paper but I'm stuck. I don't want a full answer but some feedback .Here is my progess:$$\frac{dx}{dt} = Ax(t) + Bu(t) \Rightarrow...
View ArticleFeedback Control Question: Finding compensator numerator (B(s)) and...
I wish to find the polynomials B(s) and A(s) in the following compensator equation:A(s)D(s) + B(s)N(s) = F(s)Given,$$N(s) = s - 2$$$$D(s) = s^2 - 1$$$$F(s) = s^2 + 3*s + 4$$ConditionThe degree of B(s)...
View ArticleIs it true that points of root locus only satisfiy the angle condition?
So , I was reading a course book : ''Modern Control Engineering '' by Ogata and I came forward this statement that made me skeptical:''The points of root locus only satisfiy the angle - condition....
View ArticleWhat does "analytical design" mean?
What is meant by "designing analytically" ?Especially in control systems designDoes it mean theoretically design?
View ArticleHow to convert a DC motor into a servo motor using a rotary encoder and a...
Operating/ Rated Voltage: 24VNo load Speed: 350 rpmNo load Current: 150mA (max)Max efficiency: 1.4 Kg-cm/300 rpm/ 14.2W/ 0.87AMax power: 4.5 Kg-cm/180 rpm/28.2W/1.4AStall Current: 2.9 A (max)Stall/ max...
View ArticleWhat is the feedback signal used in the speed control of a brushless DC motor?
In a brush-less DC (BLDC) motor the commonly used speed is sensed using the feedback from Hall effect sensors and the back or counter EMF. The linked article on Wikipedia also mentions that 'Other...
View ArticleHow does feedback implementation look like in a real word closed- loop process?
I'm looking for a generic term/process that explains how we can make a closed- loop control system.The typical elements of a closed loop systems are controller, actuator, plant and sensors.If you...
View ArticleWhat is a "Unidirectional Input" (?) Closed Loop Control Algorithm Called and...
PID systems inherently require some amount of overshoot in order to stabilize around a target. This often requires adding or subtracting some resultant term in order to shrink the relative error....
View ArticleSteady state error of negative feedback system - zeroes of feedback function
I am currently studying control systems from the KUO - GOLNARAGHI book. Regarding the steady state error the book makes the following distinction:Feedback function H(s) has no zero at s = 0Feedback...
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How to determine the components of a feedback control loop given following...
Based on this feedback control loopwhere $w$ is the desired setpoint, $x$ the process variable, $e$ the error value, $y$ the correcting value and $z$ the disturbance value.Did I interpret the...
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Can an electric motor act as a load for the electric generator rotated by...
I have an experimental generator and an off-the-shelf motor that I intend to arrange like in Fig. 1. The problem is that if I connect the required load to the output of the generator the power drawn...
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Discharge through a gate - Feedback needed
I need to make a PI feedback loop for a hydro power plant. The discharge through one gate is given by Q in equation 4.2. I need to keep (regulate) H = 116 m.a.s.l (meters above sea level) where H = Hg+...
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How to observe open loop characteristics with loading conditions?
I have derived transfer function of a dc motor (armature controlled). Its input is armature voltage and output is speed of motor in rad/s. How do I observe open loop characteristics with an external...
View ArticleHow to calculate the integral and derivative term and integral and derivative...
I am designing a PID controller.While calculating integral controller, should you calculate mean of all the past errors or only calculate mean of past n samples? In the case of latter, how to pick...
View ArticleCreating a model of an unknown plant/control system
I am getting stuck on the math of control systems. I would like to represent my control system as a differential equation/model. Though many examples use constants which I dont seem to have.I have a...
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Stability of a closed-loop with disturbance in output. Characteristic...
A general block diagram of a feedback controlled process with a disturbance in the output is:If we assume that the following blocks are equal to 1, and therefore we remove them:$$ K_m = G_v = G_m =...
View ArticleMultiplicative Vs Additive (PID) Feedback Loops
I normally think of PID feedback loops as being additive. This might not be quite standard, but, e.g. for a simple discrete-time proportional gain loop,$$C_{t+1}=C_{t}+G(S-M_t) \tag 1$$Where $C_{t}$ is...
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