ViewFlex Log Files
During the creation of a flexible body in a model a log file called ViewFlex.log is created automatically in the working directory.
The following example represents the contents of the ViewFlex.log file for a flexible body generated using existing Parasolid geometry, meshed with shell elements, one attachment point, with all restrained degrees of freedom (DOF) and six modes requested.
Input Data Storing
The input data-storing log checks on reading progress. In this phase, ViewFlex stores the information from the AFI file and external geometry files used to generate the mesh of the flexible body.
Reading input file ...
General data
Model 1 geometry...
Model 1 mesh params...
Model 1 material params...
Model 1 attachments...
Model 1 attachments maps...
Mesh Generation Log
The mesh generation log checks on the meshing process. Data represent the following generation steps:
■Geom - Processing external geometry file.
■Mesh - Mesh generation on previously processed geometry.
■Attachments - Definition of interface nodes between mesh and attachment points. In the following log sample, one attachment point has been connected to the mesh by 32 connection nodes.
Building flexible body ...
* model 1 geom ... Parasolid file processed
* model 1 mesh ... 1246 nodes - 622 elements - 0 free edges
* model 1 attachments ... 32
* model 1 attachments map... 1 primary nodes
* body topology ... 1247 nodes - 653 elements
■Attachments map - DOF map definition for each attachment point. In the DOF map, any DOF for the single attachment point is defined as released or constrained, allowing you to define the total number of DOF of the flexible body
■Body topology - A count of the global elements and nodes, based on either the body mesh or the attachments net mesh
The number of reduced system DOF is equal to the sum of the natural modes required and the number of restrained DOF. In the following log sample, one attachment point has been defined as fully restrained. Also, six modes have been requested. Based on the input data, 12 eigenvalues have been evaluated.
Solving flexible body ...
* solution type ... MODAL
* requested modes ... 6
* reduced system DOFs ... 12
* computed modes number ... 6
* computed eigenvalues ...
[1] 3.912063E-005
[2] 1.483084E-004
[3] 3.477571E-004
[4] 5.378237E-004
[5] 5.643235E-004
[6] 3.176503E-003
[7] 2.225206E+001
[8] 3.741923E+001
[9] 4.663257E+001
[10] 5.943418E+001
[11] 9.408711E+001
[12] 1.513061E+002
Writing MNF file ...
The MNF generation log reflects mode shape orthonormalization to obtain results based on vibration or static modes. The resultant modes are classified as rigid or flexible body modes based on evaluations of the eigenvalues and natural frequency values.
<<<< BEGIN FLEX BODY MNF OUTPUT >>>> Title: ADAMS flexible body
Name : AFX
Type : AFX
Comment 1: BUILT ON Friday, 13-December-2002
Comment 2: TIME 2:58:20
Comment 3: MSC.Software
Temp modeshape file: C:/DOCUME~1/ADMINI~1/IMPOST~1/Temp/mnf_2
Solving Generalized Eigenvalue Problem to orthogonalize mode shapes. (Finding upper Hessenberg and upper triangular forms)
(Converting upper Hessenberg form to quasi-upper triangular) (Calculating Eigenvalues)
(Calculating Eigenvectors)
Real Eigenvalues and Natural Frequencies [Hz] :
===============================================
1 : -3.98344097542439e-004 Sqrt undefined. (probable rigid body mode)
2 : -1.14193050556418e-005 Sqrt undefined. (probable rigid body mode)
3 : -8.68342775380444e-007 Sqrt undefined. (probable rigid body mode)
4 : -6.04187046338718e-008 Sqrt undefined. (probable rigid body mode)
5 : 4.77432382481547e-006 1.09970466606045e-002 (probable rigid body mode)
6 : 1.25723349222613e-005 1.78454746047229e-002 (probable rigid body mode)
7 : 1.95479004052402e+004 7.03671870757459e+002
8 : 5.52776230387530e+004 1.18329985582910e+003
9 : 8.58496216296344e+004 1.47465125358169e+003
10 : 1.39454431054181e+005 1.87947386378319e+003
11 : 3.49478105689677e+005 2.97529558722976e+003
12 : 9.03800139976711e+005 4.78471785893742e+003
Applying Gram-Schmidt to eigenvectors
Orthogonal mode file: C:/DOCUME~1/ADMINI~1/IMPOST~1/Temp/mnf_354
8%, 0 seconds left of 0 estimated total
16%, 0 seconds left of 0 estimated total
25%, 0 seconds left of 0 estimated total
33%, 0 seconds left of 0 estimated total
41%, 0 seconds left of 0 estimated total
50%, 0 seconds left of 0 estimated total
58%, 0 seconds left of 0 estimated total
66%, 0 seconds left of 0 estimated total
75%, 0 seconds left of 0 estimated total
83%, 0 seconds left of 0 estimated total
91%, 0 seconds left of 0 estimated total
100%, 0 seconds left of 0 estimated total
Exporting frequency range [-1.000000e+000,1.000000e+008]
MNF General Log
The MNF general information log lists all of the information written to the MNF file. The following are presented:
■General flexibility information
■Mass properties
■Inertia
■properties Mode
■number
■Mesh node number
■Units
Creating a Modal Neutral File with the following information: Nodal Coords Yes
Element Faces Yes
Eigenvalues Yes
Mode Shapes Yes
Global Mass Properties Yes
Nodal Masses Yes Nodal Inertias No Generalized Stiffness Yes Generalized Mass Yes Generalized Damping No Mode Transformation Yes Stress Modes No
Interface Nodes Yes Inertia Invariants No Modal Preload No
Modal Loads No
Strain Modes No
Node info: Count: 1247
Global body properties: Mass : 0.523524
Center of Mass: -225.000072 50.000006 0.000008
Inertia Tensor: 1506.802320 -5889.659987 -0.027773
-5889.659987 37344.094517 -0.000735
-0.027773 -0.000735 38746.340602
Eigenvalue info: Modes: 12
Trans Mode info: Modes: 12
Nodes: 1247
Writing Mode Shapes
Units:
Mass: KILOGRAM
Length: MILLIMETER Time: SECOND
Force: NEWTON
Number of Element Faces: 653
WARNING: Found 1 massless node(s)
<<<< END FLEX BODY MNF OUTPUT >>>>
AFX tasks completed ...