Risposto

How to specify the rotational velocity of a torque source?

If you want the shaft to spin at a specified speed, you have two options - use one or the other. Use an Ideal Angular Velocity ...

How to specify the rotational velocity of a torque source?

If you want the shaft to spin at a specified speed, you have two options - use one or the other. Use an Ideal Angular Velocity ...

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How to Establish a path trajectory for a quadruped robot in simscape multibody?

If the outer legs are taking larger steps than the inside legs, it may follow a curve even without a controller. If you want it...

How to Establish a path trajectory for a quadruped robot in simscape multibody?

If the outer legs are taking larger steps than the inside legs, it may follow a curve even without a controller. If you want it...

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Risposto

How to use the first output of a matlab function as the input for the revolute joint?

Hi Nayla - the value for initial position state target needs to be a hard coded value or a MATLAB variable. It cannot be set by...

How to use the first output of a matlab function as the input for the revolute joint?

Hi Nayla - the value for initial position state target needs to be a hard coded value or a MATLAB variable. It cannot be set by...

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Risposto

Simulink 2009 model update to 2022

Hi Scott - the Simscape Multibody first generation software last ships with MATLAB release R2019b. If you want to try the conve...

Simulink 2009 model update to 2022

Hi Scott - the Simscape Multibody first generation software last ships with MATLAB release R2019b. If you want to try the conve...

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How can I stack flexible bodies while using spatial contact forces between them?

The Spatial Contact Force block has a geometry port as its interface. You can attach rigid geometry to the flexible body blocks...

How can I stack flexible bodies while using spatial contact forces between them?

The Spatial Contact Force block has a geometry port as its interface. You can attach rigid geometry to the flexible body blocks...

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Can't find equilibrium on simscape multibody/ can't put the steady state by default

There are a few adjustments you should make to your model. Set the Consistency Tolerance in the Solver Configuration block to 1...

Can't find equilibrium on simscape multibody/ can't put the steady state by default

There are a few adjustments you should make to your model. Set the Consistency Tolerance in the Solver Configuration block to 1...

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Risposto

Bugs of Error | Actuator torque acting on joint primitive

It is hard to give you a specific answer without looking at the model. I believe you are applying a discrete motion signal, whi...

Bugs of Error | Actuator torque acting on joint primitive

It is hard to give you a specific answer without looking at the model. I believe you are applying a discrete motion signal, whi...

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Risposto

Simscape Multibody torque measurement on bushing joint seems wrong.

Hi Lukas, Your model is delivering the correct results. The force is being applied along the global z-axis, local y axis. The...

Simscape Multibody torque measurement on bushing joint seems wrong.

Hi Lukas, Your model is delivering the correct results. The force is being applied along the global z-axis, local y axis. The...

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Risposto

Unstability of spherical joint

Without your model, it is difficult to give you specific advice. If "fails" means that the spherical joint starts moving due to...

Unstability of spherical joint

Without your model, it is difficult to give you specific advice. If "fails" means that the spherical joint starts moving due to...

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Risposto

How to make a "sail" change its angle relative to way the submarine is moving?

Can you share the model? It would make it easier to give you specific advice. As long as the joint is configured to accept joi...

How to make a "sail" change its angle relative to way the submarine is moving?

Can you share the model? It would make it easier to give you specific advice. As long as the joint is configured to accept joi...

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Risposto

get Solid blocks derived inertia and mass values

The derived properties are displayed on the block, but are not accessible via get_param(). If you want to automate getting th...

get Solid blocks derived inertia and mass values

The derived properties are displayed on the block, but are not accessible via get_param(). If you want to automate getting th...

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Risposto

loaded flexible beam as initial position Simscape

This is a great model - thanks for showing the animation. You cannot specify the initial deflection for the beam through R2022b...

loaded flexible beam as initial position Simscape

This is a great model - thanks for showing the animation. You cannot specify the initial deflection for the beam through R2022b...

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Risposto

radius of disc brake block

The Disc Brake block lets you specify the radius to the brake pad, which is what is needed to determine the amount of brake torq...

radius of disc brake block

The Disc Brake block lets you specify the radius to the brake pad, which is what is needed to determine the amount of brake torq...

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Risposto

Coding a simple model with torsion spring

I think this example model will help you see a way to model this system: Mechanical Rotational System with Stick-Slip Motion ...

Coding a simple model with torsion spring

I think this example model will help you see a way to model this system: Mechanical Rotational System with Stick-Slip Motion ...

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Risposto

INVERTED PENDULUM CONTROL

Try looking at this tutorial:Inverted Pendulum: Simscape Modeling https://ctms.engin.umich.edu/CTMS/index.php?example=Inver...

INVERTED PENDULUM CONTROL

Try looking at this tutorial:Inverted Pendulum: Simscape Modeling https://ctms.engin.umich.edu/CTMS/index.php?example=Inver...

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Risposto

Im using spatial contact force between a plane and wheel but when i run the simulation the wheel falls freely. Is it a correct response or it has to stay attached to plane?

Here are some things you can try: Set the maximum step size to something small (like 0.01) to make sure the solver takes a step...

Im using spatial contact force between a plane and wheel but when i run the simulation the wheel falls freely. Is it a correct response or it has to stay attached to plane?

Here are some things you can try: Set the maximum step size to something small (like 0.01) to make sure the solver takes a step...

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Risposto

If you want to input holding torque to the joint block

You can use joint modes to lock the degree of freedom, and then release it when you want the joint to move. This will, however,...

If you want to input holding torque to the joint block

You can use joint modes to lock the degree of freedom, and then release it when you want the joint to move. This will, however,...

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Risposto

How to Determine the value of Internal Mechanics of Joint Primitive like Spring Stiffness and Damping Coefficient?

Hi @sanjeev kumar, A Revolute Joint in Simscape Multibody permits one degree of freedom. If you want to define damping and spr...

How to Determine the value of Internal Mechanics of Joint Primitive like Spring Stiffness and Damping Coefficient?

Hi @sanjeev kumar, A Revolute Joint in Simscape Multibody permits one degree of freedom. If you want to define damping and spr...

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Risposto

Simscape - multibody - frames and transforms - world frame

You need to install Simscape and Simscape Multibody to have access to the Simscape Multibody block libraries. --Steve

Simscape - multibody - frames and transforms - world frame

You need to install Simscape and Simscape Multibody to have access to the Simscape Multibody block libraries. --Steve

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Risposto

simscape kinematic loop don't accept motion input on cylindrical joint

Each of the joints in your mechanism has a target position (and possibly velocity) specified. You need to disable the targets o...

simscape kinematic loop don't accept motion input on cylindrical joint

Each of the joints in your mechanism has a target position (and possibly velocity) specified. You need to disable the targets o...

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Risposto

simscape multibody switching signals (due to Contact Library)

The Simscape Multibody Contact Force Library has blocks that accept an input signal that can disable the force. Look for the bl...

simscape multibody switching signals (due to Contact Library)

The Simscape Multibody Contact Force Library has blocks that accept an input signal that can disable the force. Look for the bl...

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Risposto

Based on geometric Feature option is disabled

You are likely importing an STL file. STL files do not contain the features needed to assign frames. Frame locations and orien...

Based on geometric Feature option is disabled

You are likely importing an STL file. STL files do not contain the features needed to assign frames. Frame locations and orien...

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Risposto

how make changeable joint limits in simscape ?

You will need to apply the joint limits as an external force. Measure the positions of each part/joint, calculate when the forc...

how make changeable joint limits in simscape ?

You will need to apply the joint limits as an external force. Measure the positions of each part/joint, calculate when the forc...

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Risposto

How to effectively and optimally simulate multiple robotic platforms in Simscape Multibody

There are many ways to accelerate your model. These can be combined for further speedup. Simplify the quadcopter model - can y...

How to effectively and optimally simulate multiple robotic platforms in Simscape Multibody

There are many ways to accelerate your model. These can be combined for further speedup. Simplify the quadcopter model - can y...

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Risposto

Nonlinear iteration is not converging (using ode23t) in Simscape Multibody

For situations like this, it is possible that changes to the model and the solver settings could enable the simulation to run wi...

Nonlinear iteration is not converging (using ode23t) in Simscape Multibody

For situations like this, it is possible that changes to the model and the solver settings could enable the simulation to run wi...

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Risposto

Single degree of freedom

This example shows you how to model this system in two ways: https://www.mathworks.com/help/simscape/ug/mass-spring-damper-...

Single degree of freedom

This example shows you how to model this system in two ways: https://www.mathworks.com/help/simscape/ug/mass-spring-damper-...

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Risposto

Plotting a potential energy function

Please read this post: https://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a...

Plotting a potential energy function

Please read this post: https://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a...

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Getting started solving ODE's - solve m [d^2(theta)/dt^2] + c [d(theta)/dt^2] + k sin(theta) = 0

As mentioned by Roger above: I think you have no choice but to solve it numerically. Even without the friction term in the midd...

Getting started solving ODE's - solve m [d^2(theta)/dt^2] + c [d(theta)/dt^2] + k sin(theta) = 0

As mentioned by Roger above: I think you have no choice but to solve it numerically. Even without the friction term in the midd...

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Risposto

how can improved gray scale quantization

As mentioned above: Improved over what? What's wrong with the way you're doing it now? Read this link then come back with an im...

how can improved gray scale quantization

As mentioned above: Improved over what? What's wrong with the way you're doing it now? Read this link then come back with an im...

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Index exceeds matrix dimensions

As posted by Geoff in the comments above: The usual procedure is to read the error message, go to the source file and line numb...

Index exceeds matrix dimensions

As posted by Geoff in the comments above: The usual procedure is to read the error message, go to the source file and line numb...

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