Questions tagged [matlab]

Use of Matlab to solve engineering problems.

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Linear and nonlinear model outputs are different using the same input

I'm working on something in nonlinear control, and we want to compare the output of the obtained linear model (state space form using steady state data) w.r.t the nonlinear model. Attached is a ...
Chek Mate's user avatar
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Designing transfer function compensator to create a stable response

I am working on create a control system to control a satellite to be fixed with respect to a distant start (theoretically). The transfer function of the dynamic model of the system is shown below in ...
Oliver's user avatar
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Autonomous vehicle lateral control

I am working on a control system for autonomous vehicles, i am using a kinematic bicycle model simulated on matlab simulink and the formula i used for the steering angle is given in the figures below ...
Asmaa GZ's user avatar
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Simulating falling and moving wooden house?

In Sweden, a newly constructed 150 m2 wooden residence built atop a mud foundation has exhibited significant structural instability. Over a period of 500 days, the house has settled by 90 millimeters ...
Léo Léopold Hertz 준영's user avatar
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Calculating noise floor level and SNR

I have N samples of a baseband IQ signal that I took from an SDR (Pluto) with a certain fs (BW = fs). How can I accurately calculate the noise floor level of that signal in dBm, SNR in dB and Peak To ...
Daniel Cohen's user avatar
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Genetic Algorithm (GA) MATLAB

I want to find the point that a two variable function has a maximum using a genetic algorithm in MATLAB. The following code implements my function. The initial function has no minus sign. ...
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81 Level Inverter Problem when using a Motor as a Load (Simulink)

i made a VFD based on (See reference 1). The problem is that, when connecting a Motor (Asyncrhonous Machine SI) as the load... the Noise just goes crazy. First, using an RLC Series Load (Default) i ...
MastergGM's user avatar
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Signal processing and modulation in Simulink

I want to add input to my Simulink model from PC / Laptop keyboard. I found a few similar s-functions in which this opportunity is implemented but the problem is that it only shows a discrete "...
syat-cd's user avatar
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How to add wireless capability to DC Electric Charging Vehicle Diagram?

I am using this DC EV Charger model as a base for research provided by Mathworks: https://www.mathworks.com/help/sps/ug/dc-fast-charger.html I want to add some wireless receiver/transciever to the ...
ADAS20's user avatar
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Optimizing Launch to LEO

I recently decided I would try to develop my own launch to LEO optimizer, as I have always been fascinated with the complexity of that problem. I have been using matlab, as I am very comfortable with ...
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How to implement H-infinity controller in STM32 platform?

I used matlab to simulate some H infinity controllers, and I have some understanding of the related theory. But I don't know how to implement H-infinite controller on STM32 platform using C/C++ code. ...
zymaster's user avatar
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What is the Z transform of the Discreate PI control model?

I have a discreate PI controller implemented in stm32 MCU, it has the following form: $$ PI=K_p\cdot[r(t_i)-y(t_i)] + (K_I)\cdot\sum_{n=0}^{i}[r(t_n)-y(t_n)]\cdot\Delta t $$ where $r(t_i)$ is the ...
zymaster's user avatar
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Is a vibrating Euler beam supposed to behave in this way?

I am a student of mathematics and for my modelling seminar, I need to dip a little bit into engineering in order to model the movements of a suspension bridge under influence of wind. This will be ...
Eriol's user avatar
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steering wheel angle control

I am working on an autonomous vehicle's control, specifically the steering wheel angle control. Knowing that I used kinematic bicycle model, my questions are: How do I choose the actuator for my ...
Asmaa GZ's user avatar
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MATLAB allmargin() function return multiple GainMargin, but how to identify them on the Bode plot?

I have a high order discrete transfer function model which has the following form. When I use the allmargin function to get the gain margin, I get the following result: ...
zymaster's user avatar
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What is the effect of the resonant frequency of the system function Porter diagram on the stability of the system and how to analyze it?

I am a novice in automatic control, the theoretical basis is not very good. We have a large electric clamping jaw, single degree of freedom, the motor is controlled by the torque output, the motor has ...
zymaster's user avatar
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Orientation and horizontal position control of a bar in 2D

I have a scenario where I have a bar of 0.1 m in length, 10N weight is applied in the center. Two forces are applied on the bar at both ends vertically, right one if 5.1 N and the left one is at ...
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Proposing a Transfer Function from a Response Graph

I need to propose a transfer function from the following graph. The K value (or amplifier gain?) we were given is 2 and it has a step response of 2 as well. When looking at the graph though it looks ...
CluelessEng's user avatar
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How to Use a parameter in Matlab Simulink?

I want to include a parameter in Simulink. For example, like the block in the picture. How to use a parameter in the gain and get the output which is L*(input), which 'L' is only a parameter, like '...
Qing's user avatar
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Simulink models comparison issue

I'm comparing two simulink models and in the report i'm getting the following difference. I don't really figure out what that difference is. Any idea is appreciated
Mohammad's user avatar
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2 answers
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How to Determine a Valid Relationship Equation Between Two Finite Datasets -- Python, Matlab or Other [closed]

I struggled to find a clear solution online so I'm resorting to asking a fresh question. I have two finite datasets (call them 40x1 vectors) that are equal in length and generate non-linear curves, ...
Austin Prater's user avatar
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What is the solutions of the following 1D diffusion equality using Crank–Nicolson method?

Through my research I faced to the following equality and need to find $c_i^{t+1}$. Moreover, I found that it can be solved by Crank–Nicolson method (see here: https://en.wikipedia.org/wiki/Crank%...
soodehMehboodi's user avatar
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Structured trianglar finite element mesh in MATALB

The available triangular mesh in the MATLAB PDE tool box here gives an unstructured triangular mesh. How can I get a structured triangular mesh from the tool box with a similar data structure [p,e,t]. ...
Morcus's user avatar
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Extraction Flash Calculation - 4 Component and 2 Phase System

I am performing extraction flash calculations for 4 component and 2 phase system in Matlab. For anyone somewhat shaky with what extraction flash calculation is; extraction is performed, feed ...
Dario Mirić's user avatar
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364 views

Modeling a second order system in time and frequency domain

For school I was asked to model the transfer function $H(s)=\frac{3}{(s+4)(s+5)}$ in both the time and frequency domains using initial conditions $y(0)=2,y'(0)=3$, a step input, and Simulink. I would ...
Red's user avatar
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Double Summation of Matrices in Convex Optimization in CVX

I want to implement the following optimization problem from the following paper Randomized Gossip Algorithms, Page 10 Eq. 53\ 1- In this problem, $W$, $P$, and $P_{ij}$ are $n\times{n}$ matrices. I ...
Spring Breeze's user avatar
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434 views

Simulink Treating Discrete-Time State-Space as Continuous-Time?

I have a MATLAB script wherein I take a second-order ODE on $\mathbb{R}^3$ (vector field on the phase space), then, at a critical point, take the Jacobian matrix $A$, use a "fully-actuated" ...
Jeffrey Rolland's user avatar
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"Roll My Own" Integrator Block for Multiple Signals

Is it possible to create a user-defined block in Simulink (and, later, XCos) that accepts a variable number of signals (I anticipate working with mainly 12 signals but not necessarily that number of ...
Jeffrey Rolland's user avatar
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Unstable System. Error Trying to model the Red Bull Stratosphere Free Fall

I tried to model a problem months ago and still I can't solve, I don't want forget this problem so I would like to share what I tried and if you know what is happening with my graph. This is the ...
rubengavidia0x's user avatar
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Why matlab returns a damp ratio as 1 for a over damped system?

I have a second order system with the transfer function as: "1/(s^2 + 5.45s + 1)", I thought it should be an over-damped system, but when I use the damp function in MatLab, it returns the ...
LHX's user avatar
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Reject Negative Input Simulink

Note: The design is implemented in Simulink. Suppose I have a system wherein I am computing the sum of errors per discrete time interval. Now, I only want to consider positive errors to be summed up ...
Rob Christian Caduyac's user avatar
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116 views

How do I find the gain from the root locus with given perfomance, where I know the real part of the poles?

I have an exercise to draw a root locus plot and determine its gain to make sure that it fulfills the performance requirements. the given system G(s) is $$G(s) = \frac{1}{s^2+s}$$ And the given ...
Zain's user avatar
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Errors obtained in the numerical solution of the 1D convection-diffusion equation

I have been trying to solve the 1D convection-diffusion equation In implementing the above, I have tried to follow closely the method described here: https://uk.mathworks.com/support/search.html/...
gary105's user avatar
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Do I need a feedback loop while testing PID controller?

This is a homework for my university course control theory. The task is simple: Test the P, the I and the D controllers separately to see the effect. We don't have to connect the controllers to a ...
Sam B's user avatar
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Pole placement with damping ratio and natural frequency

how can I find out the poles of a system if I have the damping ratio $ ζ = 0.707$ and the natural frequency $ω_n = 2.3\text{ rad/sec}$? $A = \begin{bmatrix} -0.02 & 0.1 & 0 & -9.81 \\ -0....
Tonyyyy's user avatar
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Process disturbance in PI controller help

This is the project i'm working on and i'm struggling to understand one sentence which is stopping me from progressing the project. I'm struggling to understand what it means when it says to add +/- ...
Samuel Pappalardo's user avatar
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48 views

Mixed Sensitivity Problem

I have plant, $$P(s) = \frac{1-s/5}{(s^2 + s/4 +1/4)}$$ I am taking a mixed sensitivity approach for that I have chosen $V$,$W_1$ and $W_2$ as follows: For bandwidth, $\omega$ =1 so I chose M as, $M = ...
Rip97's user avatar
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2 answers
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Fault Recovery of a UAV using MATLAB

I'm currently investigating fault recovery in a UAV using MATLAB. I've been given several variables: phi = the roll angle psi = the yaw/heading angle beta = the side slip p = roll rate r = yaw/...
gunter's user avatar
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How I can separate a matrix into two matrices in Matlab?

I want to separate into two matrices in Matlab like this: $$ Q=Sq^{T}Sq $$ for example this matrix: $$ Q=\Biggm[\matrix{92.316 &31.78&240.417\cr 31.78 &194.66 &275.47\cr 240.417 &...
user212662's user avatar
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1 answer
127 views

Optimization with GA (genetic algorithm)

I want to optimize the below function with GA(genetic algorithm): $$ \min_{l_{x_1},l_{x_2},l_d}||S_QS(z)||_2 $$ $S_Q$ and S(z) are defined as: $$ S_Q=\Biggm[\matrix{6.6549 &-0.806&6.883\cr -0....
user212662's user avatar
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Plotting S parameters on Matlab

I have equations for S11 and S21 parameters for a bandpass filter which are obviously frequency dependent. I know there are commands like sparameters() and rfplot() used specifically for plotting S ...
JOHN's user avatar
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1 answer
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Why use python over MATLAB? [closed]

So in my bachelors and throughout my engineering degree, we did everything in MATLAB. But I've heard that many companies use python over matlab. Trying Python out for myself, it seems harder to use in ...
J Doe's user avatar
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1 answer
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What meaning does the following sine wave have when it comes to amplitude?

So I am getting into engineering and was curious what it means when a sine wave isn't even in a sense, at 0, from my understanding, the waveform has peak to peak amplitude of 4, while having a ...
Jack burns's user avatar
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1 answer
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Is more requested MATLAB or Python in companies (for engineers)? [closed]

My question is not exactly on MATLAB vs Python in terms of features (about which there are plenty of topics yet). It's a specific question for engineers who have a certain experience with some ...
Kinka-Byo's user avatar
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How to model a double transfer function in Simulink?

I'm trying to model an actuator in Simulink based transfer functions previously derived. One of functions is $$\omega_p=G_2(K_cG_1V_c-c)$$ where $$G_1=\frac{K_e}{\tau_es+1}$$ $$G_2=\frac{1}{c+...
square potato's user avatar
1 vote
2 answers
94 views

How do I interpret states in the MATLAB System Identification Toolbox?

I am using the MATLAB System Identification Toolbox to estimate a 3rd order state space plant model. More precisely, the plant is a car with an Arduino mounted on it. The car takes in a PWM duty cycle ...
mhdadk's user avatar
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How can I find deflection in a member that doesn't have a constant area moment of inertia?

I'm trying to calculate the maximum deflection in a simply supported member with a uniformly distributed load. The trouble is this member does not have a constant area moment of inertia. I've drawn a ...
Hi-Polymer Eraser's user avatar
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1 answer
28 views

Regressor-passivity robot control. Help with simulation (Simulink/Matlab)

I'm trying to simulate a 2DOF planar pendulum with a regresor-passivity control, the thing is I've been having some issues with my simulation, I'm using Simulink, but in theory I know my control law ...
Daniel Arevalo's user avatar
-1 votes
1 answer
775 views

sinking speed of particle in water

For a Newtonian fluid the sinking final speed of a metal particle is given by this equation : while g is Gravitational acceleration , $\rho_P$ = is particle density , $\rho_F $ = is fluid density ,...
Mahajna's user avatar
1 vote
1 answer
546 views

Root Locus and Routh–Hurwitz stability criterion

A satellite launcher has a unit feedback system, whose TF global open loop is given by: $$G_c(s)G(s) = \frac{K(s^2-4s+18)(s+2)}{(s^2-2)(s+12)} $$ a) Draw the root locus for this function b) ...
Alessandro Melo's user avatar