Samir AKROUT

En résumé

Entreprises

• Liebherr Machines Bulle SA - NVH Expert (Onroad-/ Offroad Vehicle) & Stationary Engine

  Biberach an der Riss 2012 - maintenant NVH measurements on different Diesel & Gas engines, hydraulic pumps (PAK MKII)
  - Vibrations level on engine components
  - Vibrations level of the engines mounts: check the engine installation on test bench according to standard procedure (VDI 3838)
  - Vibration of turbochargers according to different supplier’s procedures
  - Modal analysis, Operating Deflection Shape
  - Torsional vibration of the crankshaft: single order analysis and comparison with the Torsional Visco-Dampers supplier limit
  - NVH Measurements on different machines (vehicles) in Germany, Austria, France and UK)
  - Teamwork with the simulation department to correlate with results of Finite Element Modelling/ Torsional calculation
  - Active participation to regular NVH/meeting with different engine component suppliers
  - Sound Pressure Levels (average of 4 microphones)/ Sound Power Levels of the engine using intensity probe (ISO standards)
  - Benchmark analysis
  - Literature review (gear backlash, piston slap, valve train, Acoustic covers, Applied Damping Material), evaluation to find best suppliers, identification of the major noise source using encapsulation techniques (foam lead foam laminate), built up of Semi-anechoic chamber
  - Implementing the damping materials and heavy masses for noise reduction
  - NVH troubleshooting (Engines, Vehicles and Hydraulic drive systems)
  - Cause and Effect Analysis for complex NVH issues
  - Writing and supervising reports (internal/ external (suppliers, customers))
  - Capitalize the lesson learned, setting up a NVH database
  - Member of the LIEBHERR company magazine editorial team since 2013
  2 Trainee supervisions:
  - Updating of the NVH database and familiarisation of different NVH measurements

• PSA PEUGEOT CITROEN, Centre Technique de la Garenne-Colombes - NVH Expert (consultant)

  2008 - 2012 Supervision of engine NVH testing, NVH troubleshooting - Mass production reactivity of engines (engine developed by PSA and also in collaboration with other car manufacturers: BMW, Ford, TOYOTA, Fiat) in order to reduce the after-sales costs
  - Responsibility for NVH projects for all technical issues and coordination (3 engineers, 2 technicians)
  - Communication and presentation of solution to customer
  - Problem solving of various NHV topics: starting by driving testing track (prototype until engine final-assembly plants), even journalist vehicle fleet and vehicles criticized by customers (unresolved by the after sales network/ worldwide)
  - Responsible person to develop action plan based on listening and signal processing of audio files
  - On-site investigations (mission after sales): microphones/ acceleration measurements (SQuadriga, NoiseBook, LMS Test.Lab)
  - Cause and Effect Analysis for complex NVH issues and provide solution with respect to Time, Cost, and Quality (examples: Stick-Slip noise for accessory belt, goose noise of drive belt, whining noise of oil pump etc.)
  - Ensuring that the solution has finally ended the customer criticism and there is no recurrence, supervise the expertise of the suspect component with the supplier; propose an NVH measurement plan for engine/ vehicle, crossing of components
  - Capitalize the lesson learned from different subjects to the engine predevelopment department: essential task to be more reactive in the treatment of defaults, which requires a mastery of subject and a synthesis faculty)
  

• JTEKT HPI, Equipementier automobile, Chènevières sur Marne - NVH Expert (consultant)

  2007 - 2008 Cause and Effect Analysis, NVH recommendations to reach the Acoustic target (Sound Pressure) of electro pump sets (T8 PSA project: 3008/ 5008), identification of the principal parameters influencing the Acoustic radiation, establishment and monitoring these parameters among suppliers for process stability
  - Managing test campaigns (1 NVH technician)
  - Microphones measurements (average of 9 microphones) (LMS Test.LAB, LMS CADA-X, LMS Pimento), experimental modal analysis of the electro pump sets (PULSE)
  - Supporting the NVH simulation engineer (Boundary Element Method/ LMS Virtual.Lab) for correlation with measurement results
  - Statistical study of the Acoustic radiation of the electro pump sets produced in Blois factory (France)

• Renault - Lardy Technical Center - Powertrain NVH engineer

  2006 - 2007 Management of NVH engineers/ technicians, supervision of several engine test campaigns (15 people per campaign), high expertise in analysing Acoustics high frequency issues of Diesel & Gasoline Engines
  - Microphones measurements (average of 4 microphones), Sound Power measurement using Intensity probe (LMS CADA-X, LMS Test.LAB)/ planar wheel arrays (PULSE beamforming)
  - NVH recommendations to reach the Acoustic target (Sound Power)
  - Monthly synthesis presentation (20 technical notes)
  - Standardization of NVH testing, development and writing standard test procedures for the consultants
  - Proposal and implementation of top engine cover with edges (solution)
  - Acoustic Power contribution of various components compared to total Acoustic Power of the powertrain (in function of engine speed)
  - Optimization of powertrain test campaigns in Semi-anechoic chamber to save time (3000 Euros per hour)
  
  Trainee supervision:
  - Updating of the Acoustic database radiation (SONAR consortium- Ricardo, AVL)
  - Estimated Sound Power level by Sound Pressure measurements (average of 5 microphones), comparison with Acoustic Intensity measurements

• Ecole Centrale de Lyon - Ph.D. student

  Ecully 2001 - 2005 « Deterministic dynamic behaviour and broad frequencies field of guided structures » (Vibroacoustic comfort development of automotive structures, Statistical Energy Analysis, Nondestructive testing)
  - Finite Element Modelling (ANSYS)
  - Vibroacoustic simulation (MATLAB)
  - Experimental validation (vibration measurement of stiffened plate using scanning laser vibrometer)

Formations

Réseau

• Brigitte THUREAU

• Cédric GESLIN

• Fakher KAOUACH

• Marie SIGWALD

• Nicolas CHOUARD

• Philippe LEROY

• Sarah RENARD

• Sébastien DAUBRESSE

• Yolande D'AUBIGNY