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J Chen


Last seen: 1 day ago
60 total contributions since 2019

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Answered
Simscape Multibody Add-On Download Error
Did you try to install the trial license? I had the same problem. Try to request a trial using the Mathworks website instead of ...

2 days ago | 1

Answered
How to create Simscape multibody link with a hole
https://www.mathworks.com/help/physmod/sm/ug/compounding-body-elements.html#mw_14364c3d-f2ab-4f78-bc99-d6a67541e061

20 days ago | 0

Answered
What physics engine does Simscape Multibody use?
Simscape, including all its toolboxes, is based on Simscape language. An introduction can be found at https://www.semanticschola...

21 days ago | 0

Answered
Symbolic and Jacobian Matrix
Try the following. They gave what you want in Matlab R2019b. syms m phi theta psi u1 u2 u3 u4 N = sym('n%d%d', [3 4]) T = [1 ...

21 days ago | 1

Answered
How to change the density of Simscape Multibody demos?
simmechanics.demohelpers.densities is a built-in matlab function. The output is a structure that contains the density of aluminu...

21 days ago | 0

Answered
How to create a single link manipulator model in Simulink?
Use two integrators in series. The input of the first integrator is acceleration, the output is velocity. The input of the secon...

30 days ago | 0

Answered
Modeling Simscape Spherical Air Bearings
Use the Spherical Joint in the Simscape Multibody to represent the air bearing.

30 days ago | 0

Answered
Cannot update visualization,File Solid
Seems like SS MB should be able to import Unigraphics NX and STEP files https://www.mathworks.com/help/physmod/sm/ref/filesolid....

1 month ago | 0

Answered
How to link simelectronics with sim multibody (to make electromechanical system)??
Connect a torque sensor and a PS-Simulink Converter block to the simelectronics. Use Simulink-PS converter and External Force an...

1 month ago | 0

Answered
Is it possible to apply an external force to different bodies of a multi-body system based known center of pressure coordinates?
Use a External Force and Torque block at each point the force is applied. You can use sensors to get forces and displacements an...

1 month ago | 0

Submitted


Quaternions to Euler angles conversion
Convert quaternions to Euler angles using Z-Y-X rotation sequence

2 months ago | 5 downloads |

Answered
Sum of matrix signals in Simulink
Something wrong with the dB that comes in from Inport 2. The picture shows Inport 2 has a dimension of 1 instead of 5.

2 months ago | 0

Answered
Processing 2D into 3D matrix
You need to change the following statement x = 0:1:11 x has 12 elements but the modeshapes array only allows 11 elements in th...

2 months ago | 0

Answered
How can I produce a Torque signal to activate an External Force and Torque simulink block?
Connect a Solid to a Revolute joint. Change the Actuation-Torque property of the Revolute Joint to Provided by Input. You then a...

3 months ago | 0

Answered
How can I model a Whitworth quick return mechanism in SimScape?
Download this model and take a look: https://www.mathworks.com/matlabcentral/fileexchange/74465-whitworth-quick-return-mechanism...

3 months ago | 0

| accepted

Submitted


Whitworth Quick Return Mechanism
Simulate Whitworth Quick Return Mechanism with Simscape Multibody

3 months ago | 5 downloads |

Answered
Gauss Siedel code not working
Put three dots (...) after the = at line 20 to signal that line 21 is the continuation of line 20.

3 months ago | 0

Answered
Arduino Encoder Application with Simulink Problem
You can use Simulink Delay block which store you last data. Type delay in the search box in the Simulink Library Browser to loca...

3 months ago | 1

| accepted

Submitted


CRC-16
A function to generate CRC-16 (16-bit Cyclic Redundancy Check)

4 months ago | 4 downloads |

Answered
How do I select only 100 images in a folder of 200 images, according to a list of 100 different names ?
Use the folllwoing command to get a structure that contains file information listing = dir('*.jpg'); Use the folllwoing comman...

4 months ago | 0

Answered
How to take mean of each row/column of matrix with while loop
You need to update i and j (add 1 to them) at the end of each while loop.

4 months ago | 0

| accepted

Answered
Help writing this integral
Use integral or trapz to integrate, then take the log. You need to find out the expression for p and the integration limits.

4 months ago | 0

Answered
Hello, I am getting this error. Can anyone please help me solving it? Thanks
I guess that the temperature units are 'K', 'degC', 'degF', etc.

4 months ago | 0

Answered
Difference between Simscape and Simulink
Simulink uses block diagram approach. The signal flow is unidirection. Simscape uses physical modeling approach. The signal flow...

4 months ago | 0

Answered
How do you add physical signal lines programmatically?
use h1 = get_param('mymodel/mySubsystem/C_1','PortHandles'); to get the port handles. Use add_line to draw line between the hand...

4 months ago | 0

Answered
User-defined MATLAB function block in Simulink/Simscape
use a statement like z = t / k; % don't use x to get the argument for the table lookup. Then use interp1(x,y,z) to find your ...

4 months ago | 1

| accepted

Answered
modelling in matlab of differential equation
you need an equation for dhw/dt, then use a matlab ode solver to solve the equations. see https://www.mathworks.com/help/matlab/...

4 months ago | 0

Answered
step response of Linear parameter varying model's response different from the step response of original non linear plant
You probably didn't specify the "State derivative/update offset" correctly. You need to uncheck the "Assume equilibrium operatin...

5 months ago | 0

Answered
Offset ticks and gridlines
Use xticks to place the ticks at the left of each group, e,g,, xticks([0.5 1.5 2.5]). You can use xt = xticks to get the coordn...

5 months ago | 0

Answered
Vector between vectors in intervals
vec1 = [-0.0345;0.9984;-0.0447]; angle = 5*pi/180; % angle of rotation in rad v = vec1 + tan(angle)*vec2; % length of ve...

6 months ago | 0

| accepted

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