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expert structural analyst: hyperMesh & abaqus

Seattle, Washington, United States
February 08, 2018

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Timothy R. Linser, MSME

Address: P.O. Box **** Anacortes, Washington 98221

Phone: + (1) 206.***.****


Computational Analyst: Finite Element Analysis

Versatile and highly accomplished engineering professional: 30 years of comprehensive professional experience in Finite Element Analysis. Capable: Processed numerous interdisciplinary finite element simulation projects simultaneously in a team environment. Skilled Structural Analyst: Extensive experience in a wide variety of structures and analysis methods. Expert: Theoretical, computational & experimental methods. Finite Element Analysis to characterize material, large deformation, and boundary non-linearity’s; thermo-mechanical response. Strong knowledge: Computational mechanics: nonlinear analysis Presently seeking an opportunity to engage in a challenging position in the general areas of analytical and computational mechanics, contribut- ing to further the development and practical applications of Finite Element Analysis Technology; with emphasis on theoretical and experi- mental correlations and validation.

Core Competencies

• Technical Development and Contributions

• Product Durability Analysis and Integration

• Durability Assessment Methodologies

• Validation and Testing

• Analysis Tool and Process Creation

• Method Development, Model Development & Structural Analysis

• Design Modifications and Performance Predictions

• Parametric Definition and Scripting

• Engineering Know-how and Experimental Data Acquisition / Reductions Key Skills

• Finite Element Modeling: Linear and nonlinear mechanics ( boundary, material and large displacement ).

• Structural Analysis Methodologies, Creation and Innovation: Innovated many new analysis processes.

• Product Validation: Physical Test Correlations to Finite Element Models.

• Technical Software Knowledge: Abaqus, CAE, CATIA, Hyper-Mesh, FE-Safe, N-Code, ANSA. Python, Linux & UNIX Scripting

• Communication Skills and Leadership Ability: Committed & professional pragmatic leader with strong problem-solving, management, and communication skills.

Technical Contributions & Acknowledgments

• Dassualt Systèmes: Abaqus: Industrial Contributor: Large Scale Linear Dynamics.

• Federal Aviation Administration: Principals of FEM Validation Workshop: 2001.

• Developed Modal Dynamics-Based Durability Assessment Methodologies.

• Verification: Physical Product Validation Testing and Proving Grounds Strain Gage Data; Theoretical Calculations.

• Integration of Mold Flow Analysis into Structural Durability Methods; focus on anisotropic characteristics of injection molded thermoplastic structural components.


• 1995, Concentra Corporation: Heide Cup Award for Excellence in Engineering Automation

• 1994, Special Incentive Award, Vice President and General Manager for Boeing Renton Division

• 1992, Outstanding Performance Award, Peer Recognition Program

• 1989, Structures Outstanding Performer Award, Peer Recognition Program Timothy R. Linser, MSME

Career History

E91 Technical Recurting: Dubuque, Iowa Apr 2017 - Aug 2017 < 1 > Contract Engineer: Raymond Corporation, Greene, New York.

• Stress/Strain Research OPR5xxx Lift Truck: Current product modeling to facilitate future development revisions.

• Field Test Data Aquisition & Correlation Consiterations.

• Input to standard work instructions & help with transferring loads from Adams to Abaqus. Staffing Technologies: Redmond, Washington Apr 2016 - Aug 2016 < 1 > Contract Engineer: Life Port Inc, Woodland, Washington .

• Analysis of Life Support Systems packaging & ground based lift system for Medical Evacuation Helicopters. GKN Aerospace: Tallassee, Alabama Mar 2015 - Oct 2015 < 1 > Senior Stress Analyst: Bell V280

• Resurrected analysis models & verified loads release compatibility.

• Documented flight loads envelope & identified problematic external load applications during event processing

• Corrected external load applications & structural load path idealizations to be pre design & analysis intent.

• Fatigue sized primary load paths while updating the Structural Dynamics model.

• Fetched out Critical Event filtering logic to reduce the effort required in post processing internal loads. Aurora Flight Sciences: Manassas, Virginia Nov 2012 - Jul 2014 < 1 > Structural Analyst: Unmanned Aerial Vehicles

• Developed linear & non-linear FEA models for advanced composite designs, reduction of materials test data & analysis correlations. SRI Technologies: Schaumberg, Illinois Apr 2010 - Mar 2012 < 1 > Contract Engineer: Daimler Truck North America, Portland, Oregon.

• Developed non-linear suspension component models; updated chassis, cab and aerodynamic packaging. Technical Contribution:

Collaborated with technical experts at Innova Engineering to develop processes for integrating mold-flow analysis and structural durability analysis methods; focused on anisotropic characteristics of injection molded thermoplastic structural components.

Boeing Commercial Airplane Group: Everett & Tukwila, Washington Mar 2008 - Mar 2010 < 1 > Senior Structural Analyst

• Special Projects Group: Strength & fatigue analysis in support of the 737 and 747 Airframes.

• Created automated FEA model development processes to address the non-linear nature of subject analyses.

• Parametric definition & scripting within the confines of Abaqus CAE. Technical Contributions:

Structure: 747 Fuselage

Problem: In-service structural modifications were deficient. Work Done: Resurrected wing body 875kip FAA certification basis model; applied loads and boundary conditions; ported relevant sub-structure certification effort from SAMECS to Abaqus. Result: Demonstrated that in-service anomaly could have been anticipated with subtle model changes. Initial structural modifications were likely to diminish structural performance as observed; proposed structural fix that was likely to mitigate further fleet concerns and analysis demonstrated performance enhancements 3 to 5 times. Structure: 737 Fuselage

Problem: Fuselage models needed to be verified and updated. Work Done: Verified External Loads application to 737 Airframe; Nastran models. Developed external to internal loads cross checking process; python scripting to monitor solution changes with respect to an accepted base state analysis. Developed a logical construct for verification of equivalent stiffness mapping from the physical domain to the computational representation; processed and verified skin and stringer stiffness calculations per drawings and available CATIA geometry; updated FEA models in support of service related problems analysis. Result: Provided the analysis community with documented verification processes. Timothy R. Linser, MSME

PACCAR Technical Center: Mount Vernon Washington Oct 1997 - Jul 2007 < 1 > Senior Project Engineer

• Methods Development and supporting Requests for Technical Services.

• Non-linear mechanics, Modal Dynamic based Durability Assessments, Full Vehicle Roll-Over.

• Data Acquisition and Reductions: Acceleration and Strain.

• Experimental Correlations: Modal Response, Transient Strain Histories and Durability Assessments.

• Brought on board to develop methods for addressing industry-specific needs in the non-linear mechanics. Technical Contributions and Technological Development Application: Suspension systems and chassis interfaces Technology: Boundary, material and large displacement non-linearity. Contribution: Air-Glide 200 and 300 suspension systems. Predicted in-service anomalies of AG200 using contact mechanics; boundary non-linearity. Predicted performance of proposed design modifications well in advance of prototype part delivery for physical testing; methods exploited boundary and material non-linearity; hyper-elastic materials. Pro- vided analysis support for “and-on” suspension system development. Worked with Dassualt Syste'mes: Abaqus development team to ensure that solution history reporting did not degenerate from software release to release. Result: Passed proven methods to colleagues for broader division level application. Application: FEA based durability assessments; structures whose response is exclusively dynamic in nature Technology: Modal Dynamic Analysis.

Contribution: Developed reliable modal dynamic durability assessments methods. Correlated proving grounds response to numerical predictions. Introduced technology to division level engineering for applications in design/analysis loop. Worked with Dassualt Syste'mes: Abaqus development team to enhance efficiency of necessary numerical and database access processes. Forcing function data acquisition and reductions; modal and strain response correla- tions.

Result: Proof of concept located without exception, every durability sensitive detail under consideration. Kenworth T-8 series extended day cab passed logger circuit shakes testing without incident. Peterbilt 379 design team received industry recognition for innovations in metal hood design and manufacturing. The process successfully anticipated durability sensitive details in a wide variety of structural. Passed proven methods to colleagues for broader divi- sion level application.

Application: Dynamic Analysis: More robust sub-structures were required for in-house analysis Technology: Dynamic Sub-Structuring.

Contribution: Worked with Dassualt Syste'mes: Abaqus development team to enhance efficiency of the Adams Modal Neutral File generation process; advised on enhancements for further development. Result: Significant reduction in turnaround time for producing and validating the Adams MNF process. Significant increase in quality of Dynamic Analysis predictions locally. Application: Full Vehicle Roll-Over: Indiana Mills & Manufacturing Inc. Occupant Safety Systems Technology: Explicit Non-Linear Dynamics Support.

Contribution: Developed Chassis and Trailer Models for IMMI's Technical Staff in support of their analysis effort. Vehicle Static response verified to available test data. Collaborated on model updates to facilitate IMMI's efforts in matching physical test data.

Result: Roll-Over Rate; Path; Location & Time of Initial Impact correlated very well with physical test. IMMI's technical staff successfully completed contract.

Earlier Career

Aerospace - Boeing Commercial Airplane Group, Renton Washington Senior Specialist Engineer: For detailed technical contributions to the Aerospace industry please refer to the Annex below. Timothy R. Linser, MSME

Academic Qualifications

MSME - University of Iowa Aug 1986

BSME - University of Iowa: Tau Beta Pi, National Deans’ List Aug 1984 University of Washington Department of Aeronautics and Astronautics Course I: Aircraft Composite Structures: Mechanics & Material Aug 2010 Related Course Work: Composite Material Manufacturing and Quality Control Jul 2010

< 1 > Personal Project Refurbishment of Heritage Site: Vancouver Island, British Columbia, Canada: Structure: once the only General Store between Southeast Alaska & Victoria, on the West Coast of Vancouver Island. Jul 2007 - Jan 2008: Replaced front wall, roof and windows; 14 years of structural renovations needed closure / preservation. Apr 2012 - Jul 2012: Finished all structural modifications to secure the house portion of the old general store site. Jan 2014 - Jan 2015: Systems design, procurement & installation: Hydronic, Power Distribution and Waste Treatment & Disposal. Oct 2015 - Feb 2016: Systems Installation.

Sept 2016 - Jan 2017: Storm clean up; exterior surface oiling & interior finish work. Sept 2017 - Jan 2018: Landscaping & finish work.

Timothy R. Linser, MSME

Annex: Aerospace Technical Contributions

Jul 1995 – Mar 1997

Structure: 737 -700 Nose Gear: Inner Cylinder and Axle Problem: Full scale HYSOL plastic test data suggested that potential static strength problems existed. Work Done: Developed a solid FEA stress model of the Inner Cylinder and Axle. Strain predictions in the proximity of critical details were shown to be within 2% of test strain gage data and/or other relevant theoretical predictions. Result: Design revisions validated without additional testing required. Structure: 737 -700 Main Gear: Outer Cylinder Forward Trunnion, Trunnion Pin & Cross Bolt Problem: Full scale HYSOL plastic test data could not be used to determine stress concentrations in non- visible areas of the forward trunnion. No strain gages could be placed in the proximity of the local details of concern. Work Done: Developed a solid finite element stress model of the forward trunnion, trunnion pin, cross bolt, and interference fit bushings. Strain predictions in the proximity of the critical details were validated with empirical research data and theoretical predictions to within 2%.

Result: No design revisions were required to meet safe life requirements. Jan 1995 – Jul 1995

Structure: Airframe for the High Speed Civil Transport Program (HSCT) Problem: HSCT program required a finite element expert to help complete their multi disciplinary optimal design team in order to meet NASA contract deadlines.

Work Done: Collaborated on the development of composite wing, fuselage, empennage, strut and control surface finite element models to support aeroelastic and other relevant structural studies. Colleague support in the areas of static loads and aeroelastic modeling from a common stiffness and mass idealization. Result: NASA contract deadlines met.

Jul 1994 – Jan 1995

Structure: 737 Next Generation, Wing Fixed and Movable Leading Edge Structure Problem: Knowledge Based Engineering Development Team required technically sound engineers to develop applications to automate the iterative Design Process.

Work Done: Knowledge Based engineering software development within the Intelligent Computer Aided Design (ICAD) System. Generated parametrically defined solids for export to CATIA in support of design cycle iterations. Ap- plications were designed to track design, manufacturing and analysis constraints. Constraint violations were re- ported in real time.

Result: Increased productivity of the Design Team. Awards: Concentra Corporation: Heide Cup Award for Excellence in Engineering Automation. Feb 1989 – Jul 1994

Structure: 737 –700 Airframe: Fuselage, Empennage, Center Section and Stub Wing Problem: Key team member encountered health problems that required early retirement. Work Done: Updated and validated loads applications programs. Processed external loads to produce flight condition scalars for the Preliminary Design Loads: Design Ultimate, Fail-Safe, Discrete Source Damage and Fatigue Loads Result: Colleague’s health problem had no impact on the certification effort. Awards: Special Incentive Award, Vice President and General Manager for Renton Division. Structure: 757 –200 Airframe: Fuselage, Empennage, Center Section and Stub Wing Problem: Damage Tolerance Reassessment of the airframe was required with limited staffing. Work Done: Updated and validated loads applications programs. Processed external loads to produce flight spectrum internal loads for the designated fatigue mission. Developed loads verification process. Developed a hierarchical file man- agement structure to logically link the certification basis to structural models, pay loads and external loads. Con- sulted on fatigue flight spectrum requirements.

Result: Met Damage Tolerance Reassessment Program goals and objectives. Awards: Outstanding Performance Award, Peer Recognition Program. Timothy R. Linser, MSME

Oct 1987 – Feb 1989

Structure: 707 E-6 Airframe: Horizontal and Vertical Tails Problem: Vertical tail displayed a flutter problem that caused a catastrophic in-flight structural failure. Work Done: Aided in idealizing a new structural computer model that could match flight test data. Provided the flutter group with rational stabilizer attachment stiffness to facilitate flight test correlation. Result: Flutter group was able to better understand the response of the tail. Awards: Structures Outstanding Performer Award, Peer Recognition Program. Structure: 737 –400/500, Horizontal Stabilizer, Certification and Flight Test Program Problem: Analysis codes which employed modified beam theory and multi cell torque box methods were not robust enough to produce analysis that could be utilized in meeting structural certification requirements. Work Done: Revised computational algorithms as necessary validated numerical results. Developed finite element models of the structure for flight-test correlation and certification analysis verifications Result: Structure was shown to be FAR complaint.

Timothy R. Linser, MSME

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