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J Chen


Last seen: 7 días ago Active since 2019

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Answered
How to rotate an image in Matlab
You basically read the image into a matrix, then change the array element to a different location (swich row to column, etc.)

20 días ago | 0

Answered
Clock on Mechanics Explorer Video
A simple solution is to do a screen recording that includes the Time display at the bottom of the Mechanics Explorer. Powerpoint...

21 días ago | 0

Answered
Automaticly change of actuation of joints in Simscape multibody.
Use name = gcb to get block names (select a block first) Use get_param(name,'DialogParameters') to get parameter names. The par...

21 días ago | 1

| accepted

Answered
Finding natural frequency and mode shape of damped 4 degree of freedom
Use F=ma to develop the differntial equations for m1, m2. Use F=ma and M=Iw for m3. The natural frequencies and mode shapes are ...

21 días ago | 0

Answered
Design a Transmission Shift Controller
Use a MATLAB Function block in SImulink. You can put the logic in the block. Persist variables could be useful (link).

alrededor de 2 meses ago | 0

Answered
How do i add a drive cycle in simscape to a genric engine.
You need a controller that compare the desired and measured speeds to generate the throttle command. This is not a trivial task....

alrededor de 2 meses ago | 0

Answered
How to find pressure at every section of pipes in series in simscape? One end of pipe is connected to a constant pressure source and another end is open to the atmosphere
Use the Hydraulic Pressure Sensor block in the Simscape Fundation Library - Hydraulic.

alrededor de 2 meses ago | 0

Answered
G ports in simulink?
To get the G port: open the Spherical Solid block. Expand the Export under the Geometry and check the Entire Geometry box.

alrededor de 2 meses ago | 0

| accepted

Answered
Multiple Joints on flexible parts in Simscape Multibody
You can add new frames to the body elements. The new frames will have new associated ports. You can apply the forces at these po...

2 meses ago | 0

Answered
Is it a reliable number when pid tuning is performed using simscape multibody?
The Simulink PID block correctly implement a PID control. You specify the gains in the block dialog box.

2 meses ago | 0

Answered
Moment of inertia with coordinates
Moment of inertia is or , where m is the mass, r is the distance to the rotation axis.

2 meses ago | 0

Answered
Is there another way to increase the mass flow rate on simscape?
You need to understand the physics. Flow rate and pressure are related. The pressure in a volume is determined by in and out flo...

3 meses ago | 0

| accepted

Answered
How to draw a Motor efficiency map having speed, torque and efficiency?
Use contour(x,y,z), where x, y need to be in grid corrdinate. You can study the following example for the grid coordinate x = 1...

3 meses ago | 0

Answered
Combining Simscape-Simulink Matlab versions 2018 and 2021
Replace the hard stop block with the hard stop block in the 2021a Simulink Library Browser.

4 meses ago | 0

| accepted

Answered
Connection between current measurement and sum block
Use a PS-Simulink Converter block https://www.mathworks.com/help/physmod/simscape/ref/pssimulinkconverter.html#:~:text=The%20PS%...

4 meses ago | 0

Answered
Simscape Multibody, Transform Sensor, quaternion output
Take a look at this: https://www.mathworks.com/matlabcentral/answers/415936-angle-between-2-quaternions

5 meses ago | 0

Answered
Would it be possible to change the greyscale to a blue scale?
Take a look at the colormap command - https://www.mathworks.com/help/matlab/ref/colormap.html

5 meses ago | 0

Answered
The following code is not giving errors, but it does not solve the system of equations.
In order to solve a system of equations, the number of equations needs to equal the number of variables. You also need ==0 for t...

5 meses ago | 0

Answered
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.

6 meses ago | 0

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

8 meses ago | 0

Answered
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.

8 meses ago | 0

| accepted

Answered
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.

8 meses ago | 0

Answered
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 ...

8 meses ago | 0

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

9 meses ago | 0

Answered
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...

9 meses ago | 0

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

9 meses ago | 0

Answered
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 ...

10 meses ago | 0

Answered
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?

10 meses ago | 0

Answered
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.

10 meses ago | 0

Answered
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...

10 meses ago | 0

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