CRIPTE
CRIPTE
Product by :
ONERA
Scope :
CRIPTE is used to study multiconductor transmission line networks stressed with different kinds of sources such as voltage or current generators, electromagnetic fields. Cables can be very complex, they can be shielded or not, dielectric insulators can be taken into account.
Features :
CRIPTE (in French “Calcul sur Réseaux des Interactions Perturbatrices en Topologie Electromagnétique”) is a set of programs allowing computation of propagation and electromagnetic coupling on multiconductor cable networks.
This software, developed by ONERA since 1990, is based on the Electromagnetic Topology formalism initially proposed by C.E. Baum [1] to whom the CRIPTE logo is dedicated. Electromagnetic Topology is a method which enables to handle electromagnetic coupling problems on a complex structure. Its originality consists in splitting the whole system into several subsystems that can be solved locally and independently from each other [2].
The key equation of this network theory is the BaumLiuTesche (BLT) equation. The multiconductor transmission lines networks formalism is the most direct application of this theory.
CRIPTE is made of 2 main modules:
 The CRIPTE editor module
 The CRIPTE computational module
The CRIPTE editor module is a tool with a graphical human interface (GUI) implemented with Motif/X11 libraries. It enables creation/modification of cable networks from their topological description up to the definition of run parameters. It also proposes various tools to create tubes files (described by cable lumped electrical parameters), junctions files (S, Z or Y parameters characterizing connections or terminal loads of wires), files to create sources to apply on tubes…
The CRIPTE computational module tool has no GUI. It is used to run BLT simulations (computation of currents/voltages along cable networks) or SEQ simulations (compaction of subnetworks as equivalent junctions and Thevenin generators). The input file (so called “batch card”) for the computation is the one generated by the CRIPTE editor module.
CRIPTE has been applied and is still applied in numerous ONERA projects. Among them, we will mention two particularly important milestones :

The first applications on the EMPTAC aircraft (19931996) which demonstrated for the first time the capability to model real complex cablebundles in real installation configurations.

The HIRFSE FP7 EU program (20082013) in which CRIPTE has been applied at real aircraft system level and coupled on various 3D computer solvers thanks to the HIRF SE framework.
The version of CRIPTE developed and distributed by ONERA is called the “Research version”.
The main capabilities of the 6.0 version are :
 Network creation
 Calculation of currents and voltages at any point of a tube on one or several wires
 Management of sparsity in the BLT matrix
 Compaction of subnetworks (equivalent junction and equivalent Thevenin generator)
 Calculation of the EM field emission of a cable network laying on a metallic ground plane
 Creation of ideal junctions for perfect connection between wires and to the ground
 Creation of junctions based on electrical circuit description with R, L, C lumped components
 Builtin generic termination junctions in networks: shortcircuit, open circuit, matched, 50 Ohms
 Assignment of junction data files (S, Z, Y parameters)
 Source management:
 “E run3D” sources for EM incident fields coming from 3D calculation (Agrawal’s FieldtoTL approach),
 “I run3D” sources for current on cableshields calculated by a 3D code transformed as source terms (using the transfer impedance of the cable shield),
 Lumped or localized voltage and current generators,
 Plane wave illumination of a cable network,
 Assignment of tube data files (perunitlength electrical parameters and propagation parameters)
 Zerolength tubes
 Analytical diagonalization of tubes
 Creation of models of cables with various numbers of cableshields (shields considered as equivalent wires)
 Edition of the cross section of cables with the included “LAPLACE Editor” module
 Calculation of the perunitlength (pu.l) electrical parameters L and C from the cross section geometry with the included “LAPLACE Calculation” module
 Random generation of a tube crosssection geometry with the “ALEACAB” tool
 Various models of losses on the reference conductor (in particular, lossy soils)
 Models of earthing systems
Screenshots :
Figure 1: Generation of tube 2D crosssections with CRIPTE’s ALEACAB module
Figure 2: CRIPTE in the CuToo framework (implementation of the GO32 test case)
Figure 3: The CRIPTE network of the Piaggio 180 AHC system (HIRF SE)
Figure 4: Numerical validations of FieldtoTransmissionLine applications carried out on Dassault’s F7X aircraft (HIRF SE) (courtesy Dassault)
References :
 C.E. BAUM,
The Theory of Electromagnetic Interference Control
Interaction Notes, note no 478December 1989.
 C.E. BAUM, T.K. LIU, F.M. TESCHE,
On the analysis of general multiconductor transmission line networks
Interaction Notes, note no 350 – November 1978.
 J.P. PARMANTIER,
Approche Topologique pour l’étude des couplages électromagnétiques
Thèse de l’Université des Sciences et Techniques de Lille Flandres Artois – décembre 1991.
 J.P. PARMANTIER, G. LABAUNE, J.C. ALLIOT, P. DEGAUQUE,
Couplages électromagnétiques sur des systèmes complexes : Approche topologique
La Recherche Aérospatiale, Année 1990 n^{o} 5, pp. 5770.
 J.P. PARMANTIER, G. LABAUNE, J.C. ALLIOT, P. DEGAUQUE,
Topologie Electromagnétique : Méthodes de caractérisation de jonctions
La Recherche Aérospatiale, Année 1990 n^{o} 5, pp. 7182.
 J.P. PARMANTIER, F. ISSAC, S. BERTUOL, F. BOULAY,
Modèle unifié d’un câble multiconducteur blindé : application à la susceptibilité et à l’émission électromagnétique
10^{eme} colloque sur la CEM, ClermontFerrand – mars 2000.
 J.P. PARMANTIER, X. FERRIERES, S. BERTUOL, C.E. BAUM,
Various ways to think of the resolution of the BLT equation with an LU technique
Interaction Notes, note n^{o} 535 – 1998.
Contacts :
Solange Bertuol (solange[dot]bertuol[at]onera[dot]fr)
JeanPhilippe Parmantier (jeanphilippe[dot]parmantier[at]onera[dot]fr)
Isabelle Junqua (isabelle[dot]junqua[at]onera[dot]fr)