Table driven kinematics
Table driven kinematics
(OP)
Hi,
Does anyone know of a method to drive a kinematic assembly from a lookup table of values instead of with laws. I have a mechanism with 3 commands and I want to simulate about 1000 discrete points. I have the command values already in excel, and it would be a pain to have to draw out a law for each command.
Any ideas?
Tim
Does anyone know of a method to drive a kinematic assembly from a lookup table of values instead of with laws. I have a mechanism with 3 commands and I want to simulate about 1000 discrete points. I have the command values already in excel, and it would be a pain to have to draw out a law for each command.
Any ideas?
Tim





RE: Table driven kinematics
If this helps, great. If this is what you were saying that it'd be a pain to do, then I don't know another method to make it easier - sorry!
By the way, the full help file is available at: Catia V5 help dir > DMU Kinematic Simulator > Advanced Tasks > Mechanism Design > Defining Laws in a V5 Mechanism > Defining Laws using a 2D Curve
Kevin Irrer
Powertrain Engineer
IAV Inc.
RE: Table driven kinematics
Thanks for that info. I actually did find this help file today in the end. I was avoiding the section called "Defining Laws using a 2D Curve" because I wanted to do it with a text file!
I have trialled the method with a basic input and it works as I want. I'm generating the text file with about 1000 points automatically from excel so its infinitely easier to make than drawing each law by hand.
cheers again
Tim
RE: Table driven kinematics
RE: Table driven kinematics
I havent tried this. Is there anything in the help documentation about this?
In the end I took the points from a text file and imported them as Kevin suggested. It worked well.
Id be interested in hearing how the design table metehod works.
Tim
RE: Table driven kinematics
First of all, I'm assuming you have a kinematic mechanism with multiple inputs. And you want a table of those input values to plug into the mechanism and have it move to that into that particular configuration. Right?
The basic steps for doing this with a design table are:
1. create a parameter for each input
2. link the parameters the the appropriate assembly constraint
3. make a design table (and spreadsheet) based on the parameters
4. add additionsl colums with various values
5. choose a design table configuration to apply to your assembly and update the assembly.
(as I'm writing these steps, I realized that you really don't need to use the DMU Kinematic workbench for this. As long as your mechanism assembly is fully constrained, the design table will drive the mechanism.