Overview Analysis Options Types of Analysis Steady state Find the values the plant would settle out to after an initial transient Simulation- time response How does the plant respond to a command or a disturbance Model linearization Determine the stability of the system For control system design Also for understanding system Frequency response between any two points in model Root locus, Stability margins, Eigenvalue Sensitivity, Power Spectral Density Matrix Algebra Tool Controls design Data Analysis before or after other analyses Use MSC, EAsY5 Plotter of visualize results EAS102. December 2005 pyright@ 2005 MSC Software Corporation Chart 6
EAS102, December 2005 Copyright© 2005 MSC.Software Corporation Chart 6 - Root locus, Stability margins, Eigenvalue Sensitivity, Power Spectral Density • Types of Analysis: Steady State – Find the values the plant would settle out to after an initial transient Simulation – time response – How does the plant respond to a command or a disturbance Model Linearization – Determine the stability of the system – For control system design – Also for understanding system Frequency response between any two points in model Matrix Algebra Tool – Controls Design – Data Analysis before or after other analyses • Use MSC.EASY5 Plotter of Visualize results Overview Analysis Options
Overview MSC EASY5 is Several Programs Programs you interact with MSC EASY5x main window here you construct your model schematic Also used for data entry and controlling analyses Plotter Visualize the results of the analyses Icon Editor Create custom graphic representations for your components Create component on-line documentation Matrix Algebra TOOl(MAT Programs that run in the"background Model generator Translates your schematic diagram into a Fortran subroutine of model equations called EQMO Analysis/Simulation program Where the actual computation occur Custom built for each model Library Maintenance and Model Documentation programs EAS102. December 2005 pyright@ 2005 MSC Software Corporation Chart 7
EAS102, December 2005 Copyright© 2005 MSC.Software Corporation Chart 7 • Programs you interact with MSC.EASY5x main window – Where you construct your model schematic – Also used for data entry and controlling analyses Plotter – Visualize the results of the analyses Icon Editor – Create custom graphic representations for your components – Create component on-line documentation Matrix Algebra Tool (MAT) • Programs that run in the “background” Model generator – Translates your schematic diagram into a Fortran subroutine of model equations called EQMO Analysis/Simulation program – Where the actual computation occur – Custom built for each model Library Maintenance and Model Documentation programs MSC.EASY5 is Several Programs Overview
Overview Levels of Dynamic System Simulation Fidelity Physical systems can be simulated at many levels of complexity. The"correct"level depends on the purpose of the simulation 1. Atomic level uses quantum mechanical partial differential equations(PDE's Purpose: molecular level effects Applications nuclear physics 2. Continuum (or distributed parameter)-uses field equations (PDE's Purpose: study quantities that vary significantly over the points in a geometric object Applications detailed aerodynamics, impact analysis, component (e.g. valve)analysis 3. Macroscopic (or lumped parameter)-uses ordinary differential equations Applications Flight controls, hydraulic system analysis, electric power system contro Purpose: study quantities that vary in time but can be averaged over spatial components 4. Systems analysis - uses algebraic equations with time delays Purpose: study quantities that effectively change value instantaneously at discrete instances of time Applications: Scheduling, communications Each level requires orders of magnitude more effort than the next highest but prov ides more accurate results MSC EASY5 is usually used to model dynamic systems at Level 3, but occasionally it is used for level 2 EAS102. December 2005 pyright@ 2005 MSC Software Corporation Chart 8
EAS102, December 2005 Copyright© 2005 MSC.Software Corporation Chart 8 Physical systems can be simulated at many levels of complexity. The “correct” level depends on the purpose of the simulation. 1. Atomic level – uses quantum mechanical partial differential equations (PDE’s) – Purpose: molecular level effects – Applications: nuclear physics 2. Continuum (or distributed parameter) - uses field equations (PDE’s) – Purpose: study quantities that vary significantly over the points in a geometric object – Applications: detailed aerodynamics, impact analysis, component (e.g. valve) analysis 3. Macroscopic (or lumped parameter) - uses ordinary differential equations – Purpose: study quantities that vary in time but can be averaged over spatial components – Applications: Flight controls, hydraulic system analysis, electric power system control 4. Systems analysis - uses algebraic equations with time delays – Purpose: study quantities that effectively change value instantaneously at discrete instances of time – Applications: Scheduling, communications Each level requires orders of magnitude more effort than the next highest but provides more accurate results. MSC.EASY5 is usually used to model dynamic systems at Level 3, but occasionally it is used for Level 2. Levels of Dynamic System Simulation Fidelity Overview
Advanced Modeling and Simulation With MSC,EASY5 Model Building and simulation Review EAS102. December 2005 pyright@ 2005 MSC Software Corporation Chart 9
EAS102, December 2005 Copyright© 2005 MSC.Software Corporation Chart 9 Advanced Modeling and Simulation With MSC.EASY5 Model Building and Simulation Review
Building Models Start MSC.EASY5 · Enter name of mode Open the Add component panel Press add button in the editing toolbar Alternatively: Select"Add from the EASY5x Edit Menu To add a component to your model Select the library in the top frame of the Add panel Select the group from the middle frame of the Add panel Select the component from the third frame Point at the spot on the schematic window where you want the component and click the left mouse button To add a connection between two component Click on the“From” component to select it click on the"To"component to get default connection Hold-R(right click and hold on the To" component to force a non-default connection EAS102. December 2005 pyright@ 2005 MSC Software Corporation Chart 10
EAS102, December 2005 Copyright© 2005 MSC.Software Corporation Chart 10 • Start MSC.EASY5 • Enter name of model • Open the Add Component panel Press Add button in the Editing toolbar – Alternatively: Select “Add” from the EASY5x Edit Menu • To add a component to your model Select the library in the top frame of the Add panel Select the group from the middle frame of the Add panel Select the component from the third frame Point at the spot on the schematic window where you want the component and click the left mouse button • To add a connection between two component Click on the “From” component to select it Click on the “To” component to get default connection – Hold-R (right click and hold) on the “To” component to force a non-default connection Building Models