David Neihguk Email & Phone Number

West Chicago, Illinois, United States

• Acoustical/Thermal materials development for Heavy duty, Agricultural, Forestry, Construction and Mining vehicles.- Analyze/Gather voice of customer(VOC)/customer requirements, define engineering specs, set up DVP based on ISO/ASTM or custom test.- Design and conduct engineering experiment including acoustic / thermal / durability- Perform accredited testing for acoustics and thermal performance.• Noise and Vibration Testing of Device, Equipment and Vehicles- Prepare project proposal, define objectives and scope of work, timeline and deliverables.- Define test method, equipment selection, performance metrics. - Prepare test setup, operational conditions, equipment calibration, signal processing.- Post processing, data interpretation and test report.

Lexington, Kentucky, United States

Thesis topic: Modular Vibroacoustics characterization using advanced transfer path analysis.Formulated an alternative approach to characterize acoustic sources using acoustic free velocity concepts. The acoustic transfer function is measured using acoustic reciprocity. Demonstrated it's application on a compression drive using impedance tube. Discovered several interesting connections between plane traveling wave, transfer path analysis and active noise control. In hindsight, the connection is a natural one given that active noise control is all about source characterization and its cancellation.Performed experimental and numerical simulation (using Ansys) to determine the 6 DoF transfer dynamic stiffness of spring isolator using inverse substructuring using DIRAC software from VIBES technology.

Lexington, Kentucky, United States

1. Modeling of reverberation chamber and Alpha Cabin using Hybrid FE-SEA-Ray Tracing method to simulate the diffuse field sound absorption coefficient of porous sound absorbers. Validated the VAOne model with Sabine T60 formula and the predicted sound absorption curves with measured results from round robin tests.2. Component-based Transfer Path Analysis: Applied state-of-the art in-situ blocked force method for the structure borne noise characterization of HVAC fans. The measured blocked force successfully predicted the response when applied to another compressor fan enclosure. 3. Troubleshoot source contributions of a large generator set using FEA based transfer function method in ACTRAN. The predicted results from FE model helped Kohler in achieving their customer needs.4. Investigated a novel method of panel transmission loss measurement using an anechoic termination in a Hemi-anechoic chamber. Compared the pressure method and intensity method of measurement using Simcenter SCADAS data acquisition system.5. Utilized two sound sources (low frequency speaker and high frequency speaker) in conjunction with other signal conditioning adjustments to improve the SNR of muffler transmission loss measurement with flow.6. Performed exhaust system Transmission Loss and Insertion Loss measurements using state of the art Flow rig developed at the University of Kentucky.7. Interested in the application of broadband source characterization and Auralization of Virtual Acoustic Prototypes (VAPs) to real sources.

Translating ASA activities in East and South East Asian regions into local languages and promoting the events of ASA ESEA Regional Chapter.

Hyderabad, Telangana, India, Queensland, Australia, Berlin, Germany

1. Developed SEA models to predict interior noise levels of Metros and High-speed trains. Applied simulation and testing within engineering V-model and validated the SEA model with prototype test and field measurements results. Successfully delivered Singapore Metro train with first-time right standstill interior noise.2. Evaluated multilayer floating floor design concepts to maximize transmission loss without compromising fire safety and weight. 3. Performed trade-off analysis at vehicle level to optimize vehicle noise with conflicting performance requirements under stringent weight, energy, and vehicle noise targets. 4. Performed noise calculations and prepared acoustics concept report for FLEXITY (Low floor Trams) bids and projects for Berlin, Brussels, Dresden, Duisburg, etc) leading to customer acceptance.5. Proposed, planned, and executed HVAC duct prototype testing by collaborating with cross functional teams leading to compliant interior noise levels mitigating costly retro fitments. 6. Authored interior and exterior noise test procedure as per ISO 3381 and ISO 3095, respectively and reviewed supplier test procedure involving sound power testing and sound transmission loss testing.7. Negotiated with suppliers to optimize active component source noise (such as HVAC, traction motors, etc.) and maximize passive subsystem sound transmission loss (such as windows, door, etc.).8. Reviewed supplier's technical proposals and test specifications to ensure that the acoustics targets are not compromised.9. Played a key role in supplier development for in-situ blocked force measurement using ISO 20270. This is a relatively new standard where I had gone an extra mile in convincing and educating the supplier to adopt the new method.10. Calibrated a dodecahedron sound source in terms of sound power levels and directivity patterns. Verified the free field condition of the measurement location before setting up the test.

Hyderabad Area, India, Hyderabad, Telangana, India, Queensland, Australia, Berlin, Germany · On-Site

1. Performed tonality assessment of an existing fleet of Queensland's new generation train and implemented the proposed solution leading to customer acceptance and achieving cash milestone for the project. Received accolades from the project chief engineer.2. Conceptualized and performed simulations of a plenum chamber silencer for the Cab HVAC return air duct of Sweden's VTM high speed train leading to TSI noise compliance using VDI 2081 guidelines and COMSOL. 3. Identified risks and proposed mitigation measures related to interior noise (HVAC) and exterior noise (Rolling noise, track pad stiffness) circumventing costly penalty.4. Analyzed the sound transmission loss of multi-layered floating floors for various metro applications to meet the interior noise requirements without compromising the fire safety and weight.

Chennai Area, India

Chennai, Tamil Nadu, India

1. Developed a Power-Based Noise Reduction (PBNR) based post-processing tool in Matlab to set acoustic specifications for the entire vehicle package design, including source side absorption effects. The Matlab tool helps to reducing significant manhours.2. Developed AMESim model for Torsional Vibration analysis of automotive driveline and used it to study the effect of TMD in isolating driveline vibrations.3. Implemented Transfer Matrix Method for the acoustics analysis of mufflers demonstrate the usefulness of 1-D plane wave acoustic analysis by modeling an acoustically short compact elliptical hybrid mufflers using Matlab. Compared the results with FEM results and experimental results with good correlation.4. Developed engineering applications to frontload design calculations using COMSOL App builder and deployment using web based enterprise.5. Developed engineering calculation applications using Matlab app builder.6. Campaigned for democratization of CAE which resulted in the introduction of enterprise level simulation app database. These applications are still in used at M&M.

1. Performed an extensive simulation campaign in COMSOL CFD to developed an empirical formula for the friction factor of perforated pipes. Used the formula within the flow resistance network of a compact muffler to predict the pressure drop and obtained a good correlation with test results.2. Design and developed exhaust systems, efficient mufflers for passenger cars and SUVs leading to optimum cost and weight while maintaining the acoustics requirements.3. Led Design Failure Mode Analysis of exhaust system design and identified failure modes that led to design improvements.4. Applied Mahindra Product Development System (MPDS) to design exhaust systems.5. Designed and analyzed mufflers/silencers for passenger cars using lumped parameter approach as well as FEM software using COMSOL. Investigated the effects of manufacturing defects on the acoustic performance of mufflers.6. Developed a novel empirical formula for friction factor for perforated pipes that enabled quick and efficient method to predict the pressure drop of mufflers using flow acoustic analogy.7. Developed multiple concepts of exhaust system, air intake systems and engine mounting systems using 3D models with CATIA. Generated award-winning concepts and solutions under stringent weight and packaging constraints.8. Prepared 2D, 3D drawings with the corresponding BOM and release the design through enterprise level product lifecycle management software (Teamcenter).

Developed a novel exhaust gas heat exchanger for hot box chamber inside the vehicle.

Mumbai Area, India

Doctor Of Philosophy - Phd (Vibroacoustics), Mechanical Engineering, 4/4

Activities and Societies: INCE USA Student MemberSound source characterization using Acoustic Free Velocity. My research investigates.

Master’S Degree, Automotive Engineering (Emphasis On Acoustics), 9.17/10

Activities and Societies: SAEProject: Acoustic analysis of forked dual muffler for automotive applications.

Bachelor'S Degree, Aerospace, 7.52/10

Project: Stress analysis of Functionally Graded Materials (FGM)