The Calculator ensures dynamic structural and aeroelastic analysis of arbitrary textile constructions including parachutes, ballutes, paragliders, hang-gliders, balloons, blimps, airships, airbags, air-supported structures, tents, sails, flexible tanks, cable/cord/ribbon nets, etc.
| Main_Info |
| Data_Form | Unit_system
| Finite_element_system | Warp_direction
| Fabrics | Ribbons | Loads
| Boundary_conditions | Initial_state
| Task_type | Specific_requirements
| Result_presentation |
| E-mail_Form |
| E-mail_Attachments_Form |
| Aerodynamic_Form_Links |
| Price |
| Submit_Button |
Problems. The nonlinear dynamic structural analysis provides the definition of: shape of construction under loading, stress - strained state, pulsation, dynamic and static stability, transition process, etc. The static nonlinear problem is solved as the dynamic one with the aid of artificial dissipative forces. Its guarantee fast and reliable convergence. The aerodynamic codes coupled with structural one help to define aerodynamic load as a result of aeroelastic solution.
Software. The structural analysis is performed by integrated software MONSTR based on the modified finite element method (program MONSTR-2.2) and several CFD methods (programs PARAD-2.2, DVM-2, EXPRESS).
Mail us the problem to be solved or, if your browser supports JavaScripts, fill in the forms below and submit. These forms will be sent to our server and processed. You will receive the result soon via e-mail. Optionally, the result can be also presented in printed form or published as the Web site.
Data you have to submit in forms below:
structure geometry (finite element
system / CAD solids / CAD meshes / CAD patterns / patterns in ASCII table
form /graphic GIF or JPEG files / photos / text description);
warp / weft direction in each detail/pattern;
fabrics and ribbons/cords
performances;
loads;
boundary conditions;
initial state in case of dynamic
problem;
type of task (dynamic, static, pulsation,
stability, optimization);
Forms you have to fill in and submit:
Data Form (all the data mentioned
above);
E-mail Form (your name and e-mail address);
E-mail Attachments Form
(files to be sent separately in compreessed form);
Aerodynamic Code Form in
case of aerodynamic load;
| Unit System | Finite element system | Warp/Weft_direction | Fabrics | Ribbons/cords | Loads | Boundary_Conditions | Initial_State | Type_of_Task | Other_Info |
The SI unit system is applied default. But you may assign another units
if needed:
[L] length
[M] mass
[T] time
[F] force
use these units to derive all other (ex. [pressure]=[F]/[L]^2) in data
files and data fields below.
The finite element system (FES) generation usually takes up to 90%-95% of time to fulfil the structural analysis. To speed up data preparation, choose the most suitable cases below (click one radio button) to submit/generate FES. First options takes only minutes to start computing, while the next are more and more time consuming (up to several days to create FES using graphic file with image of complex construction).
| Use Ready FES | Monstr-2.x
format | Monstr-1.x format | other
FES format |
| Use PreProcessor | Use
Patterns | Use Virtual Model
|
Do you have the data file containing FES created before? Then one can try to use it with appropriate corrections if needed. It is the best way in serial computing, when changes from file to file are insignificant. We can change FES (slightly), correct load, boundary conditions, materials, etc. Just mail us your file as compressed attachment and specify desirable corrections. Data files in formats MONSTR-2.x, 1.x and other are accepted. Click one radiobutton:
MONSTR-2.x
format.
All formats of version 2 issued after 1993 (modifications 2.0,
2.1 and 2.2 ) coincide.
MONSTR-1.x
format
Data files prepared in formats of old MONSTR versions 1.0 (1980),
1.1 (1988) and 1.2 (1990) are welcome as well. They will be converted free
into MONSTR-2.2 format in seconds.
Other
formats
Other formats of files containing FES can be probably transformed
into MONSTR-2.2 format. There are 2 ways:
1. try to convert FES into CAD format (DXF, DWG, 3DS, MAX or any
other supported/converted by AUTODESK products). If you can do it, jump
to proceed.
2. describe your format in details in "Other
info" field and submit. We'll try to create converter to MONSTR-2.2
format (it is free service!)
In order to create/edit FES the PreProcessor will be applied. It is powerful and ergonomic tool to generate FES using patterns presented in ASCII table form (list of coordinates) or in CAD format, or using virtual CAD model of construction.
Simple structures can be easily presented as patterns (ex.: gore geometry
for any parachute). Send us the file with patterns as attachment to generate
FES by PreProcessor MONSTR-2.2.
Use the
attached file with patterns of structure/details to generate FES
CAD format (DXF, DWG,
3DS, MAX, other)
Click here if you need patterns for your construction.
Complex constructions like special 3-dimensional shapes of balloons (see example) can be presented as virtual model in CAD system. Such a model is a result of Boolean (intersection, subtraction, union) and transforming (lofting, moving, rotating, scaling, beveling, skewing, bending, tapering, etc.) operations with simple solids (sphere, cone, cylinder, torus, etc.) and/or with surfaces approximated by meshes. The model in CAD format can be imported by Preprocessor and converted into FES. Note, Preprocessor is able to work with unmatched meshes of details (see example) stitching them automatically. So, one doesn't need to build global mesh (see example), but work with details or patterns (see example).
Mesh models are preferable for FES generation, since solid models take some time (up to several days) to transform it into surface mesh terms. Click appropriate radio button below and later send file in e-mail attachment form.
Use virtual model to generate FES
Create virtual model and use it to generate FES use graphic file in format GIF / JPEG
Click here if you need virtual model
for your construction.
Click here if you need patterns
for your virtual model of construction.
The shape of textile construction under load depends on the warp orientation in details. Sometimes the distortion is so significant and unpredictible, that optimization of warp direction needed. If you have no idea concerning warp direction, leave the choice to our operator. Anyway it can be specified and optimized later .
Your choice: warp/weft direction in details
Fill in the text field below, one line for each fabric sort in format
(only fabric sort name is sufficient for Russian-made textile): [ fabric
sort number (1,2,3,...)] [Young's modulus, warp] [Young's modulus, weft]
[Poisson's coeff. (set=0 if unknown)] [shear modulus (set=0 if unknown)]
[mass per area unit] [comment]. Data must be separated by at least one
space. Include table stress vs. strain for nonlinear material if necessary.
Print "unknown" if fabric performances will be specified later
(ex. during optimization). In this case operator chooses the most suitable
sort of fabric.
Fill in the text field below, one line for each ribbon sort in format
(only ribbon/cord sort name is sufficient for Russian-made textile): [
ribbon sort number (1,2,3,...)] [Young's modulus] [mass per unit length]
[comment]. Data must be separated by at least one space. Include table
stress vs. strain for nonlinear material if necessary. Print "unknown"
if performances will be specified later (ex. during optimization). In this
case operator chooses the most suitable sort of ribbon/cord.
Assign here any kind of loads acting on construction.
Acceleration due to gravity=gravity direction
Located forces Q={Qx;Qy;Qz} acting in points P={Px;Py;Pz}
of construction
assign each as string in format [Qx] [Qy] [Qz] [Px] [Py] [Pz], data separated
by spaces. The points of application P can be described in words
constant pressure (for all construction, p>0 if internal)=
complex pressure distribution specify for each detail of construction.
Hydro/aerostatic pressure P=Q*(H-Ho) linear along axis with coefficient Q= , H - coordinate (x, y or z), Ho -coordinate of point, where P=0. This static pressure distribution is used for hot-air and helium balloons, water/fuel tanks, submerged structures, water pools in tent deflections, etc.
none
wind action
(for balloons only) dynamic pressure = wind
direction =
code EXPESS (high-speed
decelerators)
code PARAD-2.2 (compressible
fluid, Mach=[0.1 ... 6.0])
code DVM-2 (incompressible
fluid, best for airfoils, wings, ram-air parachutes)
other (specify below)
If external aerodynamic code ( EXPRESS / PARAD-2.2
/ DVM-2 ) is applied in aeroelastic solution, one
have to fill in appropriate aerodynamic data
forms later.
A comprehensive list of boundary conditions (BC) is available in MONSTR-2.2 program. Any BC is applleid to nodes of finite element mesh.
The initial shape and velocities of construction are needed in case
of dynamic task. Note, that flexible structures have several types
of form: original (in patterns), initial (ex., packed, folded, at time=0)
and current/final. These forms can be distinguished critically from each
other. Compare, for example, orignal disk of ring parachute, its packed
form and shape in flight. Describe initial form and velocities in text
window below, or send appropriate files, pictures in E-mail
Attachments Form.
Results must be presented as (check):
file in MONSTR-2.2 format
for Post/Pre-Processor
shape, FES
(graphic files)
shape, FES
(CAD format)
stress (graphic files)
strain (graphic files)
pressure distribution (graphic
files)
boundary forces (graphic
files)
brief report w/analysis of
results and recommendations
other - specify in "Other
info" window above
E-mail form
Subject
Your Name
Your E-mail Address
Message. Add information, suggestion, comment, specific
requirements if any. Describe the task if data above are not comprehensive.
Indicate the range/list of parameters if serial computing needed.
PRICE:
check appropriate boxes to accept
Try
test task to see how our service works = FREE
One static task = $50
One dynamic task = $150
FES generation
using CAD or ASCII table patterns =$100
FES generation
using CAD virtual 3D-model =from $100 to $300 (*)
Create virtual
3D-model using picture or text description = from $100 to $500 (*)
Generate patterns
for complex 3D-model = from $100 to $500 (*)
Aerodynamic code application
fee = see apprropriate submittal form (**)
PreProceessor
MONSTR-2.2 = $6.200
PostProcessor MONSTR-2.2
= FREE
Processor MONSTR-2.2
= $5.800
Full featured
package MONSTR-2.2 = $12.000 (***)
Great discount
for serial computing = up to 80%
(*) - pricing is mostly determined by construction complexity.
The evaluation will be e-mailed you to accept.
(**) - click on appropriate submittal form name: EXPRESS
, PARAD-2.2, DVM-2
(***) - click HERE for discount condtions
The bill will be e-mailed
with the results.
Form of payment: wire transfer.
Click HERE to send files as attachments by regular e-mail. Please, compress files in advance. Use GIF or JPEG compact formats for graphic files (no additional compressing necessary in this case).
Aerodynamic Data Forms
(PARAD-2.2, DVM-2, EXPRESS)
In order to compute aerodynamic load you have to submit later appropriate data forms. No geometry description needed in this case, since it will be imported from MONSTR code. Use links in table to get more information and call submittal forms.
| PARAD-2.2 | info | submittal_form |
| DVM-2 | info | submittal_form |
| EXPRESS | info | submittal_form |