# J Chen

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**Content Feed**

How to loop a model's output back to the input untill they both converge

Use a Delay block https://www.mathworks.com/help/simulink/slref/delay.html

1 month ago | 0

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(Simscape multibody) Is there any way to use a specific angle as a input for revolute joint?

Set the Actuation tab as follows: Torque - Automatically computed, Motion - Provided by Input. You also need Simulink-PS Convert...

2 months ago | 0

Generic Engine stalling when load applied

You need to specify an initial speed for the propeller. It is done in the Variables tab of the Propeller Inertia block.

2 months ago | 0

Simscape Results Explorer not showing entire simulation data

Select Model Settings tab. Click Simscape. Uncheck "Limit data points" box.

2 months ago | 0

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Can I read voltage and current measurement from simulink model that containts a model of connections in Arduino Uno?

Use the Analog Input block froo the Simulink Support Package for Arduino.

2 months ago | 0

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Simscape vehicle body incline angle

Connect a Simulink signal source block through a Simulink-PS Converter block (in Simscape-Utilities) to the beta port.

3 months ago | 0

How to measure output torque of a gear in simscape multibody?

Choose the Total Torque in the Composite Force/Torque Sensing tab.

4 months ago | 0

How to visualize movement that occurred by reaction force with Simscape multibody?

The grey cube should move if it is not fixed and connected to the arm through a revolute joint. The motion maybe too small for y...

4 months ago | 0

Cannot find "body" block on Simscape

No sure what is the Body block in R2017. You can find Mass and Inertia blocks in the Simscape Foundation Library - Mechanical - ...

4 months ago | 0

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Question

PID Tuner couldn't find a stabilizing controller

The PID block in the attached Simulink file stabilizes the plant (the plant is defined in the call back). However, the PID Tuner...

4 months ago | 0 answers | 0

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answersHow 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.)

5 months 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...

5 months 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...

5 months 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 ...

5 months 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).

6 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....

6 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.

6 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.

6 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...

7 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.

7 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.

7 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...

8 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...

8 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.

9 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%...

9 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

9 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

9 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...

10 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.

11 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().

12 months ago | 0