June 22-25, 2015
Grand Rapids, Michigan, USA
DeVos Place Convention Center
Workshop ScheduleMonday; 2:30 p.m. - Now at an earlier time!
SEA for Design Applied to Wind Noise - Mark Moeller SEA Workshop
SEA for Design Applied to Wind Noise
Wind noise is an important NVH attribute that can significantly impact customer satisfaction. It is important to assess this attribute early in the design phase. Statistical Energy Analysis (SEA) is an analytical tool that is capable of assessing the wind noise performance of a vehicle in the concept design phase. This workshop starts with an overview of the wind noise problem. Then assessing the wind loads from an experimental and computational approach is discussed. Finally the interior noise assessment via a SEA model is presented. This workshop will be tutorial in nature.
- Introduction and Opening Comments - Richard DeJong (10 min)
- Wind Noise Industry Perspective - Alexander Kabat vel Job (20 min)
- Measuring Wind Loads - Paul Bremner (20 min)
- CFD to Predict Wind Loads - Phil Shorter (20 min)
- SEA Modeling for Wind Noise - Richard DeJong (20 min)
Acoustical Materials Workshop - Jian Pan, Gordon Ebbitt, Kent Fung, Rolf Balte
- Basics of Noise Control - Rolf Balte, Andrea Frey (30 min presentation + 5 min Q&A)
- Acoustical and Other Performance of Materials Through SAE Standards - Pranab Saha (20 min presentation + 5 min Q&A)
- NVH Priorities and Challenges in a Vehicle Design & Development - Taner Onsay (20 min presentation + 5 min Q&A)
Sound Quality Workshop - Wade Bray
The History and future of Fourier Analysis Workshop - Thomas Lagö, Colin Mercer Thursday; 8:30 a.m.
Structure Borne NVH Workshop - Alan Duncan, Greg Goetchius, Jianmin Guan
Intake/Exhaust-Muffler - David Herrin, Tim Wu, Tamer Elnady, and Andy Seybert Structure Borne NVH Workshop
The Structure Borne NVH Workshop continues with the same lecture team since inception in 2003. If you are still fuzzy about the new ideas you've seen, or from the hospitality suites the nights before, we have our new Thursday morning opportunity to root you in the fundamentals of Source-Path-Receiver Principles. A refined theoretical foundation covers the basics of low-frequency NVH, below 100 Hz, and mid-frequency, up to 500 Hz with guidelines for performance achievement. The New Tech section will overview the motivations and approaches for stochastic simulation, and its implications to NVH performance and efforts for test/CAE validation. Acoustical Materials Workshop
The Acoustical Materials Workshop will cover a variety of topics by long time industry experts from OEM and supplier communities. The workshop will start with basics of noise control for those who are new to the industry, followed by presentation of various SAE standards related to measurements of acoustical materials. And finally, the workshop will address NVH priorities and challenges from a OEM perspective. The History and Future of Fourier Analysis Workshop
Frequency analysis is often referred to as Fourier analysis but is that really true? The foundation is based on stationary and "Fourier signals." What happens if that is not the case? Modern FFT signal analyzers use very sparse sampling that is correct according to Shannon but what will happen when using time domain analysis. Many of the myths and frequent questions will be answered using a "user perspective" and rules of thumb will be given together with good methods to avoid large errors. After attending this session, a much better understanding in regards to pitfalls and proper methodology will be the outcome. Sound Quality Workshop
The purpose and orientation are to empower engineers to recognize and fully connect their innate hearing capabilities with interactive analytic tools to characterize, design and improve mobility-product sounds considering human perception. An overview differentiates sound quality engineering from general acoustics as historically practiced, introduces the scientific field of Soundscaping, and provides a thought-context for productive work. "Ear training" examples will be included for recognizing sound characteristics such as modulation, tonality not caused by pure tones, and various types, scales and superpositions of time-dependence. The workshop illustrates and trains the approach to issues by linking perception with technical measurements, including both conventional and psychoacoustic tools. As always, a CD of the presentation will be given out at the close of the Workshop. SEA Workshop
This workshop will present a practical introduction to SEA Modeling and its use in vehicle applications. A brief introduction to SEA will be followed by a broad spectrum of SEA models applied to vehicle acoustic design. Three distinct applications will be presented. These applications extend from passenger vehicle and heavy truck to SEA applied to aerospace vehicles. This workshop is structured as an introduction to SEA especially for those with limited experience in vehicle acoustics modeling. It also provides an opportunity to establish technical contacts for continuing working relationships. Muffler and Silencer Design Workshop
Silencer and muffler design is primarily accomplished via cut-and-try approaches in many industries. Noise issues are identified close to production and mufflers are designed and tested. In this workshop, a design process for mufflers is recommended. The steps that may be taken during the 1) clarification of task, 2) conceptual design, 3) detailed design, and 4) prototyping phases are outlined, and the process is demonstrated at each step for a cross-flow type muffler. It is shown that plane wave analysis is especially valuable in the conceptual design stage whereas numerical simulation is of greater value in the detailed design stage. Basics and tips for both plane wave analysis and numerical simulation are discussed. Measurement of transmission loss using the two-load method will be described and demonstrated using a transmission loss test bench. In addition, several important muffler components will be surveyed including baffled silencers, diesel particulate filters, catalysts, and perforates.