# J Chen

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**Content Feed**

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.)

22 days ago | 0

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...

23 days ago | 0

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...

23 days ago | 1

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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 ...

23 days ago | 0

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).

2 months ago | 0

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....

2 months ago | 0

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.

2 months ago | 0

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.

2 months ago | 0

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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...

3 months ago | 0

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.

3 months ago | 0

Moment of inertia with coordinates

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

3 months ago | 0

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...

4 months ago | 0

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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...

4 months ago | 0

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 months ago | 0

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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 months ago | 0

Simscape Multibody, Transform Sensor, quaternion output

Take a look at this: https://www.mathworks.com/matlabcentral/answers/415936-angle-between-2-quaternions

5 months ago | 0

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 months ago | 0

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 months ago | 0

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 months 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().

8 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.

8 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.

8 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 ...

9 months ago | 0

Heatmap - how to get the plotted colors

camp = colormap https://www.mathworks.com/help/matlab/ref/colormap.html

9 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...

9 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.

9 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 ...

10 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?

10 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.

10 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...

11 months ago | 0