Rotational motor issue for the motion analysis

[huiduan]

Hello, I am new for the motion analysis. I created a bipedal robot and would like to see the motion simulation. I set up a initial position for the robot and I also set up the expression for the hip motor. Everything is prefect in the animation. However, in the motion analysis, the motor will jump forward a little in first 0.05 second and I am not sure why. Both of leg have the same issue and I will use the right leg as the example. The initial position of the tight has the 55 degrees and the leg is expected move backward at the beginning. The expression is also attached. The issue is the leg will suddenly move forward 20 degrees at 0.05s. Does anyone know why this happen? At the first stage, I fixed the body just see the motion of two legs, therefore, I only set up a gravity.

[zwei]

could you share the files? without looking at the files it is a bit hard to say whats wrong

[SPerman]

When I've had similar issues, it was due to a keyframe having a position locked.

https://help.solidworks.com/2021/Englis ... motion.htm

[huiduan]

could you share the files? without looking at the files it is a bit hard to say whats wrong

Hi, I have upload the file.

[huiduan]

When I've had similar issues, it was due to a keyframe having a position locked.

https://help.solidworks.com/2021/Englis ... motion.htm

Hi, so how should I unlock the position?

Thank you