Jon_Bradley
New member
Well I was helped with my previous problem...solved thanks to Jbuckl
However I now have a new problem. I'm now trying to create a 4 wheel model of a basic car (4 wheels pin jointed to a chassis), falling under gravity onto a flat plane. I have deliberately positioned the car at an angle so that the wheels hit the ground at different times, and (when suspension is added to the model) I will be able to observe the suspension moving independently to reach equilibrium.
The flat plane (floor.prt) is placed into the assembly at the default location. Since I want 3 dimensional motion of the car, I have not added any constraints to it, just positioned it above the floor. 4 Cam connections are defined(one for each wheel) between the wheel surface and theupper floor surface. Lift-off enabled, cam friction properties defined.Gravity and mass are defined.
Here is a snapshot of the initial condition (the purple arrow shows the gravity direction):
View attachment 2915
However when I run a dynamic analysis (gravity and friction enabled) the car drops onto the track, but there is something wrong: two of the wheels are semi-submerged into thefloor, and then the car slips sideways across the floor, despite there being no sideways forces applied to the model.
Here is a photo ofits positionafter the dynamic analysis (1.8 secs duration)
View attachment 2916
I wonder if it is something to do with the cam surfaces not being parallel to one another (due to the rotation of the car). But I can't think what it could be.
Here I have uploaded a zip of the files 2006-11-25_203703_PRO_E_PROBLEM.zip. I would be really grateful ifsomeone would be willing to take a look at the saved analysis and tell me whereI'm going wrong.I am using Wildfire 2.0
Thanks,
Jon.
Edited by: Jon_Bradley
However I now have a new problem. I'm now trying to create a 4 wheel model of a basic car (4 wheels pin jointed to a chassis), falling under gravity onto a flat plane. I have deliberately positioned the car at an angle so that the wheels hit the ground at different times, and (when suspension is added to the model) I will be able to observe the suspension moving independently to reach equilibrium.
The flat plane (floor.prt) is placed into the assembly at the default location. Since I want 3 dimensional motion of the car, I have not added any constraints to it, just positioned it above the floor. 4 Cam connections are defined(one for each wheel) between the wheel surface and theupper floor surface. Lift-off enabled, cam friction properties defined.Gravity and mass are defined.
Here is a snapshot of the initial condition (the purple arrow shows the gravity direction):
View attachment 2915
However when I run a dynamic analysis (gravity and friction enabled) the car drops onto the track, but there is something wrong: two of the wheels are semi-submerged into thefloor, and then the car slips sideways across the floor, despite there being no sideways forces applied to the model.
Here is a photo ofits positionafter the dynamic analysis (1.8 secs duration)
View attachment 2916
I wonder if it is something to do with the cam surfaces not being parallel to one another (due to the rotation of the car). But I can't think what it could be.
Here I have uploaded a zip of the files 2006-11-25_203703_PRO_E_PROBLEM.zip. I would be really grateful ifsomeone would be willing to take a look at the saved analysis and tell me whereI'm going wrong.I am using Wildfire 2.0
Thanks,
Jon.
Edited by: Jon_Bradley