# Tag Info

## Hot answers tagged motion

8 votes
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• 198
2 votes
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### Finding cubic polynomial equation for 3 joints

I guess you want to find a cubic polynomial for the end effector. You have 3 coordinates for your points A and B, from your question is not clear if they are $x,y,z$ or $x,y,\theta$. Anyway, I'll show ...
• 341
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### Motion planning and robot controlling

The model you have given is called the unicycle model and is widely used n robotics. In general the model is given by \begin{eqnarray} \dot{x} &= v\cos \theta \\ \dot{y} &= v\sin \theta \\ \...
2 votes
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### Why don't bipedal robots ever feature natural movement?

From my side I can provide two remarks. First the human have elastic actuators (muscles) with a lots of sensors for balance. Whereas robots have mostly rigid actuators with a few dampers here and ...
• 1,327
2 votes
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### Quadrotor SE3 Controller: Calculating Rd_dot

In this paper rotation matrices are used to describe the orientation of the quadrotor. This is chosen because each orientation as a single representation (contrary to quaternions) and gimbal lock is ...
• 1,327
2 votes
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### Explanation for exponential coordinate of rotation

First note that $p(0)$ travels along an arc of the circle of radius $r = \Vert p \Vert \sin(\phi)$ centered at a point on the axis of $\omega$; and the velocity $\dot{p}$ is perpendicular to the arc ...
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### A powerful pull/rotate device that provides a certain (controllable) force?

If I understand your question correctly, it seems to me that you are looking for a DC torque motor (brushed or brushless) with a suitable sensor attached to the load or to the output shaft. The sensor ...
• 375
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### Bump and turn toys: how do they work?

There's two parts. The wheel you're remembering is a castor wheel that's designed to stick at straight forward when the car is going forward, and will turn to about 20 degrees when the car goes ...
• 1,881
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### Name of imitating motion technique in Robotics

A robot manipulator that’s designed to mimic an operator in real-time can be called a “waldo” or "telemanipulator". The term "waldo" originates from Robert Heinlein, and was widespread enough at least ...
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### Real Time Motion Control

The key elements to real-time motor control is the motor controller and the motion controller (which can be a CNC, a robot controller or other type of controller). The following description fits most ...
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2 votes
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### Equations of motion with mass attached to end effector and external force

In Lagrangian mechanics, you're required to deal with the generalized forces and the concept of virtual work $\delta W$. In our case we have:  \delta W_{F_x} = F_x \cdot \delta q_1 + F_x \left( -...
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