SIMPACK Model: Quarter Car Tasks (2) 	Setting up a SIMPACK Model (1): Create a new model:  --  File / Open Model/New        or:--  File / Open Model/ (select an already existing model) /Copy Load the Model into the Pre-Processing: --  Pre-Processing / Model Setup Set up/check the Gravity Vector: ---  Globals / Gravity/Volume Forces Set up/check the View up Vector, Color Scheme and Light Definition:--  3D-Customizing / ... Set up the model‘s kinematic tree (remember the model-topology !)of Bodies and Joints. Bodies in SIMPACK consists of: A bodyfixed Reference Frame R; all geometrical declarationsare represented relative to R  mass properties (mass, center of gravity, inertia tensor)	 Markers (built-in position and orientation) to connect Joints,Constraints, Force Elements, Sensors 3D-geometry (built-in position and orientation, type,parameters and color of Primitives) What has hopefully been learnt over the last two days Inertia values not necessary.  Force definition Static equilibrium, nominal forces, parameter variation.  1. Nominal Force Calculation  2. Set Forces =0. Static Equilibrium  Introduction to Forces  Quick difference between PtP and Cmp  Forces are always calculated max.book118.com. the ‘from marker’ (small sketch on board). Info can be found in the Test Call  What we are aiming to learn/teach from this model Nominal Forces = Preloads Introduction to Forces  Quick difference between PtP and Cmp  Forces are always calculated max.book118.com. the ‘from marker’ (small sketch on board). Info can be found in the Test Call  Emphasis that not all measurements are recorded only those specified can be plotted.  Damping varied from 0 to100 Ns/m in steps of 20.  Time integration 0 to 5 sec, 101 steps. Quick Summary of Linear Interpolation and Cubic Spline with caution.  In post-processing Force v. Marker Distance to generate above graph from data.  Force 4 to be used to take the input function value. What we are aiming to learn/teach from this model The second body is identical to the first so the identity button can be used if preferred.  1. Copy initial states to linearization states. 2. Eigenmode calculation 3. Animation Quick Run through of some of the curve definitions 	position/velocity sweep 	Sinusoidal excitation Ensure that the output generator is used and understood.  A body can not be connected to a moved marker, but there is ways around this problem (Rheonomic joints). A force, as described in two mass oscillator, is connected to a moved marker.  Export some values from 2D plots, so they can be compared to the next slide. (Simplomat) Using Joint 40 the output from the Time excitation can be inserted  Try a variety of excitations from the library and try to import values similar to those export in the previous example What can be learnt from this model This model introduces constraints, easier to encourage sketches before starting building model.  Encourage people to realise there is three possible solutions to the problem.  LINKS Ixx = Iyy = 0.27083333 Izz = 0.0083333  BLOCK Ixx= 0.08 Iyy = Iz
SIMPACK基础.ppt