Dynamic Structural Analysis

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:

Forms you have to fill in and submit:

Data Form

| Unit System | Finite element system | Warp/Weft_direction | Fabrics | Ribbons/cords | Loads | Boundary_Conditions | Initial_State | Type_of_Task | Other_Info |

Unit System

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.

Finite Element System (FES)

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 |

Warp/Weft direction in details

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

Fabric Performances

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.

Ribbon / Cord Performances

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.

Aerodynamic load (select one)

    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.

Boundary conditions

A comprehensive list of boundary conditions (BC) is available in MONSTR-2.2 program. Any BC is applleid to nodes of finite element mesh.

  • unmovable node or assigned motion of node;
  • node gliding along axis, broken line, curve, chain of finite elements;
  • node moves along/above/below plane, smooth surface, finite elements;
  • previous condition includes gliding in symmetry planes;
  • node - fixed point distance is constant/more/less the assigned value;
  • node - node distance is constant/more/less the assigned value;
  • node attached/stitched to any point of any finite element;
  • ... and more

Initial state

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.

Type of task to be solved

Other Information & Specific Requirements

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

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.

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.

Receipt of your order and timing of work will be confirmed via e-mail

E-mail attachments

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

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

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