Is it possible and practical to build an electronic box with this transfer function?

PID controller is reportedly widely built and used in control systems engineering for industrial applications. The PID-controller has a transfer function as: (Kd*s^2+Kp*s+Ki)/s. Therefore, it...

08 November 2020 7,771 10 View

What if we flip the role of actuator and plant blocks in a linear control system block diagram?

We all have been accustomed to see a block diagram for a linear control system, where in the forward path, first sits the controller, then actuator, and then plant. What if we flip the blocks of...

05 October 2020 9,363 21 View

What are the major causes of rejection of scientific papers?

What determines the success or failure in publication of scientific manuscripts? More often than not, scientific manuscripts are prone to rejection, because of the process being mysterious and to...

30 September 2020 768 1 View

Is it possible to control a control system in real domain, with a control signal which contains complex (imaginary) values?

Assume we have a control system in state space as: xdot1=u1, xdot2=u2, where x is state and u is control. I am interested to know the possibility of complex valued control signal to control such...

27 August 2019 7,065 3 View

How to get and plot the surface of value function v(x,t), for an optimal control problem?

please catch a glimpse on the pdf attached to this question, and let me know, how to plot the surface of value function v(x,u,t). Please also remind me what are the names of coordinate system on...

16 April 2019 5,766 1 View

Why is control set in theoretical control systems theory, assumed convex?

I am interested to know, why is control set in control systems theory, usually assumed convex, more specifically, a convex cone, a convex hull or a convex set? Please let me know if you've gotten...

24 March 2019 7,247 4 View

Which one, tensor strain-rate or engineering strain-rate for 2D fluid flow analysis?

I am to know what is the difference of using tensor strain (particularly its rate) and engineering strain-rate for two dimensional fluid flow analysis. As you may know, the Navier-Stokes momentum...

16 August 2018 5,567 4 View

How can I solve these plain differential equations related to fluid-flow velocity vector field?

Assume: du= f1(u,v).dx+f2(u,v).dy (1) dv= g1(u,v).dx+g2(u,v).dy (2) f1,f2, and, g1,g2 are continuous and known functions. We know further that implicitly h(u,v)=0 and hence we...

25 July 2018 6,300 9 View

How to visualize fluid-flow vector field, having implicit ode of the velocity components?

I want to have insight over fluid-flow vector field, as I have an ordinary differential equation (ode): dv/du=-2(u2+v2)/(v2 - 5u2) where u and v are horizontal and vertical velocity components...

24 July 2018 4,828 5 View

What is the real model associated to ordinary differential equation: xdot=x^3+u?

As I know, the ordinary differential equation (ODE), xdot= -x^3+u, where x is the state variable, and u the control variable, is the control system associated to a falling object in atmosphere...

24 June 2018 7,903 99 View

Could you recommend any books about Number Theory?

Beginner level books. High level books. Analytical Number Theory. Algebraic Number Theory. Combinatorical Number Theory. Books about partitions. Books about primes.

03 March 2021 7,174 5 View

Arena simulation - how do i model the following model in ARENA (see description) (new to ARENA)?

Hello, I'm fairly new to ARENA and I have the following problem: I have two queues in which, in each queue, a different order type arrives (both having an arrival rate of exponential 10). Order...

02 March 2021 2,431 3 View

Isolates of Hymenoscyphus fraxineus?

Dear Dr. Cai, my name is Simone Prospero and I work in the team of Phytopathology at the Swiss Federal Institute for Forest Snow and Landscape Research (WSL;...

01 March 2021 1,133 1 View

How to eliminate Steady state error from Reinforcement learning genetic algorithm code?

The following code (see 1st 2 images attached) is used to produce PID controller values that are designed to control the system (G). The code finds the PID controller values (noted as k) by using...

28 February 2021 6,560 14 View

What is Flat Lens Antenna?

28 February 2021 5,433 3 View

Can impedance of antenna be less than 50 ohms?

I am simulating helix antenna in hfss, right now, giving excitation with 50 ohms port. When I see the results of Z parameter (real). It shows lower than 50 ohms. Do not understand, if it can be...

27 February 2021 4,218 7 View

What are the application of Fixed points thoery in Chemistry.?

It is said that fixed point theory has lot of applications not in the field of mathematics only but also in various areas. So I am looking for applications in Chemistry only..

26 February 2021 3,533 1 View

LEDs on Vis Light photo degradation of MB water sol via N doped TiO2 in a mini flume?

Good day to all, I have no experience with light emitting diodes. I am building a glass mini flume to demonstrate the photo degradation of Methylene Blue in water running over self cleaning...

26 February 2021 4,026 5 View

CGA 300 Regulator for CO2 cylinder?

Has anyone ever tried to deliver CO2 with a CGA 300 regulator? I know that a CGA 320 regulator is standard for CO2. The issue is that I currently do not have any free CGA 320 regulators. I also...

25 February 2021 3,292 3 View

How to interpolate from a time-series database ?

Hi, I am having trouble with a problem, in the field of Optimal Control and the generation of optimal time-series. Let's consider a system, whose dynamics are represented by dx/dt =...

24 February 2021 9,105 2 View