# J Chen

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**Content Feed**

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.

12 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

| accepted

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

### 1

answerHow 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

### 0

answersI 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

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

### 0

answersQuestion

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

### 0

answersI have a . Mat file of battery model how can i create simulink model from it

Mat file contain variables and their values. You can load it to the workspace. The file most likely contains test data. You need...

9 months ago | 0

| accepted