System engineering

System mastery by "model based engineering system"

SHERPA ENGINEERING is expert in Object/Process approach

 
SHERPA ENGINEERING is specialized in engineering system based on modeling techniques

 

SYSTEM ENGINEERING STUDIES

 

Sherpa promotes mastery of complex systems

Doing well at first time by validating upstream

Based on SE standards, Sherpa Engineering is involved in the different phases of the life cycle of systems
  • The preliminary studies : system frame, multi dimensional system modeling, creation of a repository of targets, contribution to the emergence of new innovative concepts
  • Studies of system acquisition : provision of multi-professional teams as part of the extended enterprise.
  • Studies of conceptualisation : architecture design, system analysis & optimization , defining the best solution in relation to the demands by the fair use of needed models,
  • RAMS studies : assessment of risk early in the design,
  • Integration & Validation studies : contribution to the virtual validation
  • Support organized with templates and tools for each phase.
 
 

ENGINEERING SYSTEM FRAME

It consists in the development of a reference frame throughout the life cycle.
This repository is divided into a description of the system, the missions, the functions and all activities or processes of the life cycle.

In complex projects, it is necessary to provide a collaborative response to the complex demands, capitalize the know-how to model the system over the life cycle, to formalize the process of moving towards an agile system.

The implementation of the SE approach requires :

- Maturity on the methodological principles and appropriate organizations,
- The use of techniques of multi-view representations : requirements and associated tests, modeling of functional and physical architectures, behavioral models.
- Tools for managing all of these models and data. (see Smarteam, Arkitekt)
Sherpa provides transverse management, the definition of the referential and the increasing maturity (CMMI).
 

MULTI VIEWS MODELLING

Engineering needs and requirements :
  • Hierarchical functional architecture modelling
  • Hierarchical physical architecture modelling
  • IVVQ : Integration, verification, validation, qualification

Méthods & Tools : Sysml , Doors, Rhapsody, Artisan, Papyrus, Arkitekt , Smarteam

 
 
SIZING & ARCHITECTURE STUDIES
In the design process, the steps are the following :
  • Make the choice of functional architectures,
  • Define the organic architecture (arrangement of the components),
  • Specify or select the technology components.

The design is carried out on different life situations, including a critical set of steady state and dynamic cycles. The suggested approach is to conduct a top-down approach (functional) coupled with a bottom-up approach (organic) with a consideration of functional and technology.
 
SYSTEM ANALYSIS
multi-criteria optimisation studies
The approach is multi-criteria and is to merge different kinds of criteria : functional, dimensional, temporal, technological, integration in a restricted environment, risk, cost, availability ...
The models are used to :
  • Perform direct calculations to simulate all the criteria
  • Classify the functional and organic architecture and establish business charts to establish the synthesis compromise decision support,
  • Determine directly the functional or dimensional parameters by inverse calculation methods or nonlinear optimization under constraints,
  • Select the optimal configuration and validate the satisfaction of all criteria.
Methods & Tools : Modefrontier , Matlab/Simulink
 

 
Example of canonic representation of a system
 

INTEGRATION & VALIDATION TESTS

This business has in fact several activities summarized below :
Analysis of specifications : the integration and validation of a system through the reading and analysis of specifications describing the system.
Writing tests and validation scenarios : the most exhaustive list of possible testing was established, without being excessive or unrealistic (time validation reasonable, non disproportionate resources ...).
Preparation and organization of tests : we must organize, plan and prepare for the tests (means must be defined, controlled and "owned").
Test simulation : simulations allow to develop the system and begin its validation early. Particularly through programming scripts post-processing, analysis and display of results (figures, statistics, automatic synthesis ...).
Test on real system : the job is to monitor the physical integration of the system (assembly and assembly of parts) and then carry out the tests under the most representative possible in accordance with the tests requested. Analysis of these results allows us to detect discrepancies between what was specified and obtained

 
 
RAMS : Reliability, Availability, Maintenability, Safety
 
Given the lack of good engineering and experience on innovative study of dependability is an essential step in the process of analysis and integration of the industrial system in its environment.
The security operation is motivated by :

The risks of industrial systems (not including the emergence of new risks associated multiplexing and the electronic board)

The complexity of the achievements

The new technology

The growing demand of customers

 
Principle :
Increase knowledge by analyzing each type of operation and looking systematically the consequences of a default on the system (sensor, actuator, communication system or flight).

General approach :
The application of this approach allows for systematic analysis of reliability and to synthesize and prioritize all modes of failures likely to occur. Thus, the system can handle a preventive or corrective the occurrence of such failure modes
 
NORMS & STANDARDS
ISO 9001, ISO 15288, EIA 632, ECCS,
 
REFERENCES

Experience in the automotive, aeronautics, space and process

  • Modelling of life support systems of ESA.
  • Design of flight control system of electric vehicle
  • Operate bench testing electrical organs

Test benches of computers

(see MIL MIL
SIL
HIL Les offres MIL, SIL, HIL de Sherpa : la validation se situe à toutes les étapes du cycle de développement de fonctions de calculateurs moteurs, conditionnement d’air, chaîne de traction, … / SIL MIL
SIL
HIL Les offres MIL, SIL, HIL de Sherpa : la validation se situe à toutes les étapes du cycle de développement de fonctions de calculateurs moteurs, conditionnement d’air, chaîne de traction, … / HIL MIL
SIL
HIL Les offres MIL, SIL, HIL de Sherpa : la validation se situe à toutes les étapes du cycle de développement de fonctions de calculateurs moteurs, conditionnement d’air, chaîne de traction, … / PIE)

 
TRAINING
The aim of the training is to provide a comprehensive industrial approach combining :
  • The needs and requirements process
  • The model based system engineering up to integration, verification, validation, qualification
  • The different life cycle stages : design, production, use, withdrawal
 
BUSINESS APPROACH
Phase 1 : Exploratory phase and preliminary study. definition of objectives associated with the repository design. Designation and specification of the required variety
Phase 2 : Specification of the system supporting the missions of the customers
Phase 3 : Projects realization
Phase 4 : Implementation and Deployment
Phase 5 : Growth in capacity
 

INDUSTRIAL COLLABORATIONS

 IBM : Smarteam
 KI : Arkitekt
 See4Sys