Mon 15 Sep 09:43:56 CEST 2025
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README.md
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README.md
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@ -42,6 +42,41 @@ python2 $TOP/src/main.py ParamJSON/simndt_paramas_alu_hole_20mm.json
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## JSON Format
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### Material Libarary
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All materials are labelled with an integer index number (0, positive) and a name. The simulation set-up uses only the index number of a material:
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Note: The included material list determines the simulation model with respect to minimal grid distance and time step distance. Therefore, include only materials used in this simulation!
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1. Pre-defined from built-in material library:
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```
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"Materials": [
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{
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"Name": "aluminium",
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"Label": 0
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},
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{
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"Name": "air",
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"Label": 160
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}
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]
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```
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2. User-defined by providing material parameters (Rho: density, VL/VT: long. and transv. velocities in m/s):
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```
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"Materials": [
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{
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"Name": "mysteel",
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"Label": 130,
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"VL": 5850,
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"VT": 3220,
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"Rho": 7800
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},
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```
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### Import
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#### Material
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@ -69,16 +104,60 @@ Exports material matrix
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`enableMaterial:true,Material:XX`
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- Iabs: Material label matrix w/o boundaries, front-end
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- Im: Material label matrix with boundaries (same size as field matrix), front-end
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- RV: Rho,VT,VL material matrix set, back-end (engine)
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- RC: Rho,C11,.. material matrix set, back-end (engine)
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- *Iabs*: Material label matrix w/o boundaries, front-end
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- *Im*: Material label matrix with boundaries (same size as field matrix), front-end
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- *RV*: Rho,VT,VL material matrix set, back-end (engine)
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- *RC*: Rho,C11,.. material matrix set, back-end (engine)
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#### Signals
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`enableSignals:true,Field:XX`
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- Export sensor signals (derived from Field XX)
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Fields: "Vx","Vy","[Vx,Vy]","Txx","Txy","Tyy","[Txx:Txy:Tyy]","Dx","Dy","[Dx,Dy]","SV"
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- Fields: "Vx","Vy","[Vx,Vy]","Txx","Txy","Tyy","[Txx:Txy:Tyy]","Dx","Dy","[Dx,Dy]","SV"
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#### Sensor Placement
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- Paramters (margin offsets and delta increment): [ox,oy,dx,dy]
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- Sensor matrix shape (number of columns and rows): [sx,sy]
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- Default:
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```
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ox=dx=round(xn/(sx+1.0))
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oy=dy=round(yn/(sy+1.0))
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for x in range(0,sx):
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for y in range(0,sy):
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S[y,x]=D[oy+y*dy,ox+x*dx]
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```
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- User setting:
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```
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"sensorPlacement":[ox,dx,oy,dy],
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"sensorShape":[sx,sy]
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```
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All parameter values in grid coordindates!
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E.g., plate 500x500, 1mm grid distance, but field grid is 187x187 points (depends on other simulation and material settings)!
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#### Output Formats
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1. numpy (enableNumPy=true), 2-dim (one file per time step) or 3-dim (enableVolume=true)
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2. csv (only single sensor signals, no 2-dim fields), one row per time step
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#### Field
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- Tension Txx, Txy, Tyy
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- Velocity Vx, Vy
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- Displacement Dx, Dy
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- SV
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#### Example Sensor Field
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- Optional: The material grid is exported (Rho, VL, VT), too
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```
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"Export": {
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@ -92,6 +171,7 @@ Fields: "Vx","Vy","[Vx,Vy]","Txx","Txy","Tyy","[Txx:Txy:Tyy]","Dx","Dy","[Dx,Dy]
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"Material": "RV",
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"enableFields": false,
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"enableNumPy": true,
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"enableCsv": true,
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"enableSignals": true,
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"enableImages": false,
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"enableMaterial": true,
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@ -103,3 +183,51 @@ Fields: "Vx","Vy","[Vx,Vy]","Txx","Txy","Tyy","[Txx:Txy:Tyy]","Dx","Dy","[Dx,Dy]
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}
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```
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#### Example Single Sensor
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Note: The sensor settings have no inmpact on the simulation model and the simulation, it is just a field selection rule.
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- sensor position ist (56,180) mm
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- more than one sensor can be sampled (saved)
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```
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"Export": {
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"Step": 20,
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"Save_filepath": "./data",
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"Filename": "fields-sensor-56-180",
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"Field": "Txx",
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"enableFields": false,
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"enableNumPy": false,
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"enableCsv": true,
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"enableSignals": true,
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"enableImages": false,
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"enableVolume": true,
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"enableView": false,
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"sensorShape": [1,1],
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"sensorPlacement": [56,0,180,0],
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"sensorSize": 0
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}
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```
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### Simulation
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- dx and dt are optional and set static simulation constraints and must be lower than computed minimal req. dx/dt
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- Entire simulation time in Seconds
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- Maximum frequency to be sampled in Hz (minimum value is given by the stimulus base frequency and time step)
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- Point cycle sets the snapshot interval saving field (sensor) values, i.e., each PointCycle step
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```
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"Simulation": {
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"PointCycle": 10,
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"SimulationTime": 150e-6,
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"TimeScale": 1.0,
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"MaxFreq": 120000.0,
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"Order": 2,
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"Device":"CPU",
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"dx" : 0.001,
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"dt" : 1e-7
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},
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```
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