Overview of the MLS Programs

MLS programs are designed to run on PCs with MS-Windows operating system and can be used in conjunction with the standard input and output files of DRI/KRASH. All MLS programs are compatible with the latest DRI-KRASH version.

More information about DRI-KRASH: www.dri-krash.com

Program	Description
MASK	generates a KRASH input mask
MASSPLOT	creates plots of the KRASH model by use of the KRASH input file
KR2NAS	KRASH to NASTRAN converter
KOMPRASH	KRASH data compression KOMPRASH files include all time-history data of the KRASH output files
KAP	KRASH Animation Program - Animation and plots of the deformed model
CUTKRASH	Reduces the size of the KRASH output file; alters KRWIN output files to be compatible with older KRASH versions
MLPLOT	creates time-history plots
GENFORCE	calculates the global forces / moments and the rotational accelerations around CG

Running the MLS programs is very easy and comfortable. MASSPLOT, MLPLOT and KAP use pull-down menus which are selected by pressing a mouse button.

There are a lot of options to change the appearance and the amount of graphic output. However, you can easily generate a fully annotated chart by pressing a mouse button only 3 times. For example - Create a model plot with MASSPLOT or KAP: Select a file (2 clicks), place the cursor on DRAW and press the button again - that's it.

All fonts and printers supported by Windows can be used with the MLS programs.

The KRASH - MLS Concept

MASK 3.0

The program MASK generates a KRASH input mask which is based on the input format described in the 'DRI-KRASH / KRWIN User's Guide'.

To create a new KRASH input mask, the user has to fix the number of used KRASH elements in cards 40 - 80 and 140. MASK reads these cards and completes the input file with cards 200 - 5000. The MASK output file includes all required KRASH input cards in correct number and order.

MASSPLOT

MASSPLOT generates plots of the KRASH model using the standard KRASH input file. This file does not have to include all input cards - basic information about masses, beams etc. is sufficient to run MASSPLOT. Therefore, the program is a useful tool during the model development phase.

Masses, nodepoints, beams, springs and DRI elements may be selected from the ELEMENT menu to be displayed singularly or all together. All these different element types may be numbered (=> NUMBER menu).

The VIEW menu offers 5 standard views of the KRASH model or any user-defined orientation of the model. To look at details, the user can zoom into the model and define the viewable window with the MINMAX menu.

KRASH models using the RUNMOD=2.0 option (card 110, half airplane input) are displayed as full airplane models. The plot includes element numbering of the second half model.

Different KRASH files may be selected at the same time and displayed on one page with up to 4 graph windows (CASE 2). These windows may also be used to display one model in different views.

Menu

Purpose

File
Layout
Scale
Shift
View
MinMax
Element
Number
LegPos
Text
Font
Options
Draw

Select / drop file / Print / Quit program
Define number of graphs, file-graph-assignment.
Scale model in x-, y- or z-direction (default factor = 1.0).
Shift model in x-, y- or z-direction (default = 0.0).
Define view (x-z-, y-z-, x-y-plane or other view).
Define minimum and max. values of axes (zooming can also be done with the mouse).
Define element types to be displayed.
Define element types that are to be numbered.
Define position of legend inside the graph.
Title, legend- and axes text can be changed by user input.
Define fonts and fontsizes
Grid, (background-)color, text-options, units (English-Metric), ...
Command starts graphics output using current settings.

Creating a Bitmap file

A Windows Bitmap file (*.bmp) is created by clicking the right mouse button inside the graphic window. The bitmap files will be named MLS001.BMP ... MLS999.BMP.

KOMPRASH 3.0

KOMPRASH is the KRASH DATA COMPRESSOR. It reads the KRASH ASCII output file as well as all the KRASH binary output files and generates the KOMPRASH binary output file (KRFILE.KPR) which is used by the KRASH Animation Program KAP.

KOMPRASH files include all time-history data of the different KRASH output files as well as the basic model data (masses, beams, springs etc.).

KAP-3 (KRASH Animation Program)

KAP-3 Features

· KAP shows the movement and deformation of the KRASH model.

· The colours of the KRASH beams are dynamically changed to show the amount of forces.

· With this feature, the user can easily identify the locations of maximum load.

· For fast data access, KAP works with the binary direct access files generated by KOMPRASH.

· KAP is a Windows program and has access to all Windows fonts and printers.

· The graphics which are generated by KAP can be saved in a Windows bitmap file by simply clicking the right mouse button inside the graphic window.

· With this feature, it is possible to generate a video (AVI file) or animated GIF file.

The UH-1H KRASH model in this example was generated by Dynamic Response, Inc., CA, USA.

KAP-3 Menus

File Layout State Scale Shift View MinMax Elem Num LegPos Text Font Options Draw Anim An.Type

Menu

Purpose

File
Layout
State
Scale
Shift
View
MinMax(*)
Element
Number
LegPos
Text
Font
Options
Draw
Anim
An.Type

Select / drop file / Print / Quit program
Define number of graphs, file-graph-assignment.
Select time / state(s) to be displayed (maximum of 100 states)
Scale model in x-, y- or z-direction (default factor = 1.0).
Shift model in x-, y- or z-direction (default = 0.0).
Define view (x-z-, y-z-, x-y-plane or other view).
Define minimum and maximum values of axes (zooming).
Define element types to be displayed.
Define element types that are to be numbered.
Define position of legend inside the graph.
Title, legend- and axes text can be changed by user input.
Define fonts and fontsizes
Grid, (background-)color, text-options, units (English-Metric), ...
Command starts graphics output using current settings.
Start animation.
Animation type: standard or color anim (=> e.g. beam forces)

ANIMATION TYPE

KR2NAS 1.0

CUTKRASH 4.0

The program CUTKRASH reduces the size of the KRASH output file (ASCII) by removing the printer plot symbols (‘*’, ’=‘, ’+’) and unnecessary blanks from the time-history data block. This procedure reduces the file size by up to 40 - 70 % and takes only a few seconds.

In the latest version, another feature was added to CUTKRASH. The program alters the KRWIN ASCII output files in such a way that they are compatible with older KRASH versions running under the DOS operating system (e.g. KRASH9602, KRASH97).

With this capability, KRWIN output files can be used together with MLPLOT versions 2.4 / 2.5.

MLPLOT 2.5

MLPLOT 2.5 creates line charts of all time-history data stored in the KRASH output files. 87 different types of KRASH data may be plotted with MLPLOT. By default these data use ‘time’ as x-axis, but you can specify any other dataset as well. For example, you can plot spring forces dependent on spring compression.

If you select different data types (for example forces and accelerations) you can have up to 4 differently scaled (and labelled) y-axes with one graph or up to 4 single graph windows on one page. The data may be selected from up to 10 different files.

KRASH output data that may be plotted with MLPLOT

ENERGY
Kinetic Energy
Potential Energy
External Work
Strain Energy
Damping Energy
Crushing Energy / Hydrodynamic Work Vert.
Friction Energy / Hydrod. Work Horizontal
Ground Energy / ---

CENTER OF GRAVITY
Displacement
Force
Velocity
Acceleration

DRI (Dynamic Response Index)

MASSPOINT
Displacement
Euler Angle
Velocity - Ground Axes
Velocity - Mass Axes
Rotational Velocity
Unfiltered Acceleration
Filtered Acceleration
Rotational Acceleration
Mass Impulse

NODEPOINT
Displacement
Velocity - Ground Axes
Velocity - Mass Axes
Unfiltered Acceleration
Filtered Acceleration
Node Impulse

SPRING
Compression
Axial Load
Soil Penetration

BEAM FORCES
Force
Moment at I,M
Moment at J,N
Force at I
Force at J
Moment at I or J

BEAM DEFLECTIONS
Relative Deflection *J-I*
Relative Rotation *J-I*
Relative Rotation *J+I*
Hinge Rotation at I
Hinge Rotation at J

BEAM STRESS
Stress Ratio Top - Bottom (*)
Stress Ratio Left - Right (*)
Stress Ratio Top - Bottom (**)
Stress Ratio Left - Right (**)
Axial Stress and Buckling Load

(*) Maximum Shear Stress Theory
(**) Constant Energy of Distortion Theory

BEAM ENERGY
Strain Energy
Damping Energy

HEAD IMPACT
X-Velocity
Y-Velocity
Z-Velocity
Total Velocity
Relative Displacement

HIC
Position
Velocity
Acceleration
Force

HYDRODYNAMIC LIFT SURFACE
Penetration
Normal Force
Normal Pressure
Equivalent Mass Factor
Normal Velocity
Wave Height
Wave Vertical Velocity

HYDRODYNAMIC DRAG SURFACE
Penetration
Normal Force
Normal Pressure
Submerged Area

OLEO
Shock strut stroke - YOLEO
Shock strut stroking velocity - YDOLEO
Total shock strut axial load - FOLEO
Air load - FA
Hydraulic damping load - FH
Damping coefficient - BDAMP
Rebound damping coefficient - BHREB
CDAO
Energy abs. by axial motion - ENOLEO

INVERSE METERING PIN ANALYSIS
Shock strut stroke - YOLEO
Damping constant - BH
Metering pin diameter - DPIN
Net orifice area - ANET

SCOOPING DRAG SURFACE
Penetration
Normal Force
Normal Pressure
Penetrated Area

MLPLOT - Graphics screen menus

Quit Scale Shift Layout MinMax Join LegPos Text Special Device ReDraw

MENU	PURPOSE
Quit	Go back to DATA SCREEN.
Scale	Multiply all values with factor (default = 1.0).
Shift	Add value to all data (default = 0.0).
Layout	Number of graphs on output page, Y-Axes, X-Base.
MinMax	Define minimum and maximum values of axes (zooming).
Join	Give same attributes (color, line type) to different data => connect curves from KRASH restart runs
LegPos	Define position of legend inside the graph (9 possible positions).
Text	Title, legend and axes text can be changed by user input.
Special	Grid, (background-) color, line type, units (English, metric etc.)
Device	Output on screen, printer or Windows bitmap file (*.bmp).
ReDraw	Command starts graphics output using current settings.

Trademarks

DRI/KRASH and KRWIN are trademarks of Dynamic Response, Inc., CA., USA.

CUTKRASH, MLPLOT, MASSPLOT, KAP, MASK, and KOMPRASH are trademarks of MLS, Boeblingen, Germany.