Unformatted text preview:

COMP155/EMGT155 Model Conversion Examples Wed Nov 19 System: MECH1 Iconic model: mech1_iconic.emx Parameters: Initial Values: Simulation result:COMP155/EMGT155 Model Conversion Examples Wed Nov 19 Bond graph model: mech1_bondgraph.emx Parameters: Initial Values: Simulation result:COMP155/EMGT155 Model Conversion Examples Wed Nov 19 Converting to Block diagram: Start by labeling efforts and flows: Replace bond graph components with equivalent block diagram components Effort Source: e1 = F = 20 f1 is free Mass: ݂ଶ=1ܫන݁ଶ Damper: f3 = (1/R)e3 or e3 = Rf3 1-junction: f1 = f2 = f3 e1 - e2 - e3 = 0 e1 f1 e3 f3 e2 f2 ∫ e2 f2 1/I 1/R e3 f3 Note: 20-sim’s block notation is slightly different than what we used earlier. Rather than a multiply or divide block with two inputs, 20-sim uses a gain block with one input and a multiplier value as the block label. 20-sim does have a MultiplyDivide component, which is more like the multiply and divide block we used earlier. R f3 e3 F e1 f1COMP155/EMGT155 Model Conversion Examples Wed Nov 19 Now we have to find ways to connect the components, using the equations from the 1 junction. Since the flows are all equal, the output of the mass (f2) can be used as the input to the second option for the damper (f3). We can close the loop by rewriting the effort equation at the 1-junction: e2 = e1 - e3 Now we can build the 20-sim model: mech1_block.emx Simulation result: ∫ e2 f2 1/I R f3 e3 ∫ e2 f2 1/I R f3 e3 F e1 + -COMP155/EMGT155 Model Conversion Examples Wed Nov 19 System: ELEC1 Iconic model: elec1_iconic.emx 1 2 1 2COMP155/EMGT155 Model Conversion Examples Wed Nov 19 Replace iconic components with bond graph equivalents: Connect components following expected current flow: Eliminate sources with zero output and loose junctions: Let 20-sim finish the simplification:COMP155/EMGT155 Model Conversion Examples Wed Nov 19 Bond graph model: elec1_bondgraph.emx Conversion to block diagram: Start by labeling efforts and flows: e1 f1 e2 f2 e3 f3 e5 f5 e4 f4 e7 f7 e6 f6COMP155/EMGT155 Model Conversion Examples Wed Nov 19 Replace bond graph components with block diagrams from equations: Manipulate junction equations to connect components: f7 = f6 f4 = f3 – f5  f4 = f2 – f6 e6 = e5 – e7  e6 = e4 – e7 e2 = e1 – e3  e2 = e1 – e4 + - + - + -COMP155/EMGT155 Model Conversion Examples Wed Nov 19 Block diagram model:


View Full Document

PACIFIC COMP 155 - Model Conversion

Download Model Conversion
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Model Conversion and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Model Conversion 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?