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# J Chen

Last seen: 15 days ago Active since 2019

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Solving a system of three second order coupled differential equation
Use as states and express the derivatives of the states as functions of the states, e.g., d/dt()=etc.

16 days ago | 0

Solving ODE with sqrt
If you know how to solve an ODE in Matab, the problem might be negative values for the sqrt().

2 months ago | 0

how to get eigenvalues and plot it
Use a loop to calculate and store the eigenvalues for each time point. Plot the data outside the loop.

2 months ago | 0

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Does Simscape Multibody enable torsion system modeling consisting of 2 or 3 rotating masses / inertias connected by spring and damper elements?
Connect the inertias with revolute joints and specify the spring stiffness and damping coeficient in the joint parameters.

2 months ago | 0

Singularity error encountered when calculating inverse dynamics of a elastic joint.
Probably better to specify the desired angle at the output port (F port) of the Torsional elastiticity & damping block. You can ...

3 months ago | 0

Heatmap - how to get the plotted colors
camp = colormap https://www.mathworks.com/help/matlab/ref/colormap.html

3 months ago | 0

Which Block for Frequency as input signal for a prismatic joint?
You can apply force or impose motion for a Prismatic Joint. Use SImulink blocks to generate the signal you want and feed the sig...

3 months ago | 0

Extracting natural frequencies and mode shapes from a Simscape Multibody model
You probably can linerarize your Simscape model and calculate the eigenvalues and eigenvectors.

3 months ago | 0

How to design controller for models in Simscape multibody?
You can use MATLAB 'linearize' command to lineraize Simscape plant models, [sys, ~, info] = linearize(plantModel, opPoint). The ...

4 months ago | 0

What can I do to import a complete assembly into Multibody if I'm using Fusion 360?
Can you export the model to a CAD software that supports Simscape Multibody Link?

4 months ago | 0

I want to use variable as an input in a single run.
Try to feed the signal to the 'To Workspace block' directly to other blocks.

4 months ago | 0

Finding pitch, yaw for a delta three wheeler using simscape or vehicle dynamics blockset
The Vehicle Body block only describes vehicle longitudial dynamics. You need a block that handle lateral dynamics to get roll an...

5 months ago | 0

how to change simulink matlab (bellow) to code matlab? How do I enter the initial value?
https://www.mathworks.com/help/matlab/ref/ode45.html

5 months ago | 0

elevator motor modelling code
You need to model the system with a differential equation: . Solve the equation with MATLAB or Simulink for given N(t).

5 months ago | 0

Contact Forces/Torques for Robotics Applications
The Spatial Contact Force Block will automatically apply the forces to the elements connected to its two ports. You don't need t...

6 months ago | 0

3D matrix with equation
does mean ? You can calculate the result using three loops on i, j, and l.

6 months ago | 0

How to interpolate when we have two different sizes
temps_B and B have different size. They need to be the same size.

6 months ago | 0

Question

Separate Simulink block name into several lines
How can I separate the name of a Simulink block into serveral lines in R2020b? The Retuen key doesn't seem to work in this new r...

7 months ago | 1 answer | 0

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How can I get the value by choosing 't' and 'x'? ,How should I set the graph range?
Move the plot command outside the loop. Store the calculation at each time step in a buffer. For example: hist = nan(n,length(t...

7 months ago | 0

Log simulink (variable step) data with with one sample time!
Uee the To Workspace block in the Simulink Sink category and specify the Sample time in the block parameters.

7 months ago | 1

Question

Dispaly numbers in Simscape Mechanics Explorer or Simulink 3D animation viewer
How can I dispaly numbers in a Simscape Mechanics Explorer? The numbers need to be displayed in the Mechanics Explorer in order ...

8 months ago | 0 answers | 0

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I can't plot this 3D matrix despite looking at other examples
The matrix has 3 independent variables. 3D plots using surf can only have 2 independent variable. You need to general 4 3D figur...

8 months ago | 0

If loop with character and two conditions
Use strcmp(t_adf_fdiff.reject,t_kpss_fdiff.reject) insteafd of t_adf_fdiff.reject == t_kpss_fdiff.reject. The two if statemen...

8 months ago | 0

How can I print the heatmap as grayscale?
heatmap(A) colormap(gray)

8 months ago | 1

| accepted

solving equations with trigonometric functions
format long % show more digits double(S1.theta3) double(S1.theta4) format % back to the default format

8 months ago | 0

How can I apply the same force on multiple objects in Simscape Mulitbody?
The problem is not with the force block. The problem is caused by incorrect configuration of the components, i.e., the component...

8 months ago | 0

specialist/gig help
Try Upwork.com or freelancer.com

8 months ago | 0

Question

Split Simulink 3D viewer into multiple panes
Is it possible to split the Simulink 3D Viewer into multiple panes? I can split the display pane of the 3D World Editor into mul...

8 months ago | 0 answers | 0

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Question

How to add a ROUTE node in the 3D world?
How can I add a ROUTE node in the 3D world as hilighted in the screen shot? Thanks.

8 months ago | 0 answers | 0