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2016-04-25 ...
  • April 25-26, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
The sound package materials for vehicle noise control seminar provides a detail and thorough analysis of three different classes of acoustical materials – namely absorbers, barriers, and dampers, how they are different from each other, and acoustical properties that materials should possess for optimum vehicle noise control. The seminar addresses new advances in acoustical materials, primarily in absorption materials that impact the vehicle acoustics. The seminar covers ways to evaluate the acoustical performance of these materials using different test methods, including material, component, and vehicle level measurements.
2016-04-12
Event
This session will cover intake/exhaust/powertrain and chassis noise and vibration. Papers covering vehicle interior comfort, advanced methods and subjective response are also welcome
2016-02-02 ...
  • February 2-4, 2016 (2 Sessions) - Live Online
  • August 2-4, 2016 (2 Sessions) - Live Online
Training / Education Online Web Seminars
This web seminar provides an in-depth overview of diesel engine noise including combustion and mechanical noise sources. In addition, the instructor will discuss a system approach to automotive integration including combining sub-systems and components to achieve overall vehicle noise and vibration goals.
2015-10-28
Event
2015-10-28
Event
The design of experiment (DoE) method and the related data based modeling have been successfully used for many years in the area of powertrain calibration and function development. Typically the models are used in a PC environment as plant models or are used in real-time applications in hardware-in-the loop systems. It is also possible to have these data based models executed real-time in embedded control systems. Usage of this methodology in powertrain controllers has not been widely adopted. Recently new algorithms have been established which ease the application of data based modeling in embedded control. For powertrain function development at Bosch, the DoE tool ASCMO from ETAS is used. A Gaussian process regression (GPR) model is the backbone of the algorithm. The possibility of executing such a GPR model in realtime on a current 32-bit powertrain multicore controller with sufficient accuracy has been investigated.
2015-10-28
Event
BorgWarner has a long history of developing wet clutch and hydraulic control modules for Dual Clutch Transmissions (DCT). In addition, BorgWarner has developed the complete control algorithms for DCT’s. Recently BorgWarner has developed iClutchTM, an electro-hydraulic system that actively controls the clutch in a manual transmission. It includes an add-on, fully integrated hydraulic control module and an optional wet friction clutch. The control algorithms have also been developed by adapting the DCT algorithms to the single clutch and master/slave architecture of MT’s. This presentation will discuss the development of the BorgWarner iClutchTM control algorithms and present results from prototype vehicle tests.
2015-10-09 ...
  • October 9, 2015 (8:30 a.m. - 4:30 p.m.) - Charleston, South Carolina
  • March 21, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
  • September 30, 2016 (8:30 a.m. - 4:30 p.m.) - Scottsdale, Arizona
Training / Education Classroom Seminars
The October offering of this seminar is held in conjunction with the SAE 2015 Brake Colloquium and Exhibition. Register for this offering and you can register to attend the SAE 2015 Brake Colloquium and Exhibition for 25% off the classic member event rate. Please contact our Customer Service department at +1.877.606.7323 (U.S. and Canada only) or +1.724.776.4970 (outside U.S. and Canada) to register for SAE 2015 Brake Colloquium and Exhibition at this special rate. Brake noise is one of the highest ranked complaints of car owners.
2015-10-05 ...
  • October 5-9, 2015 (8:00 a.m. - 8:00 p.m.) - Troy, Michigan
Training / Education Classroom Engineering Academies
This Engineering Academy covers a variety of vehicle noise control engineering principles and practices. Two specialty tracks are available: Vehicle Interior Noise and Powertrain Noise. While the Powertrain Noise track focuses on NVH issues generated by powertrain noise sources and the design strategies to minimize them, the Vehicle Interior Noise track focuses on the understanding and application of acoustical materials to optimize NVH in the passenger or operator compartment of a vehicle. Considerable attention is given to current measurement and instrumentation technologies and their effective use.
2015-10-05 ...
  • October 5-9, 2015 (8:00 a.m. - 8:00 p.m.) - Troy, Michigan
Training / Education Classroom Engineering Academies
This Engineering Academy covers a variety of vehicle noise control engineering principles and practices. Two specialty tracks are available: Vehicle Interior Noise and Powertrain Noise. While the Vehicle Interior Noise track focuses on the understanding and application of acoustical materials to optimize NVH in the passenger or operator compartment of a vehicle, the Powertrain Noise track focuses on NVH issues generated by powertrain noise sources and the design strategies to minimize them. Noise sources include engines, transmissions/transfer cases, accessories, exhaust, gears, axles, joints, and couplings.
2015-09-29
Technical Paper
2015-01-2854
Timothy Opperwall, Andrea Vacca
Hydraulic systems have an important role in both on and off-highway vehicles. Designing for improved noise performance of fluid power systems is an essential part of improving current systems and opening up new areas where fluid power can bring improvements in efficiency and performance. As the technology advances and spreads to lighter applications, the noise generation and propagation due to hydraulic components becomes a primary design concern. The present research includes development of acoustic radiation models for noise radiation from hydraulic pumps and motors. The need for new methods for identification of noise sources and transmission is evident in order to direct future modeling efforts. Discovering the key features of noise generation from both simulation and experimental techniques allows for improved techniques to improve the noise performance of fluid power components and systems.
2015-09-27
Technical Paper
2015-01-2690
Joo Sang Park
This paper introduce several practical cases to cure the squeal noise by investigating pad unstable behaviour and self-excited vibration, and propose frequency guide lines for better noise performance. These guide lines are very useful for designers especially at the initial design stage. By using historical DOE, practical frequency guide lines will be proposed to achieve better noise performance at the initial design stage by using historical database analysis. This study has some limitations that the guide lines are available for disc. It will be further study for other brake components. In conclusion, the practical guide lines for robust disc design will be proposed after analyzing a pad unstable behaviour and disc self-excited vibration during squeal by theoretical , numerical and experimental approach. Finally the guide lines is validated by statistical approach by reviewing historical DOE for various brake systems.
2015-09-27
Technical Paper
2015-01-2687
Aditya Kant Choudhary, Yogesh Mense, Saurabh Singh, Mahesh Shridhare
Brake noise is one of the common complaints and an irritant not just for the vehicle occupants but equally for the passers-by. Brake noise is actually vibration that is occurring at a frequency that is audible to the human ear. This occurrence of brake noise like brake squeal (>1 kHz) and groan (<1 kHz) is often very intense and can lead to number of customer complaints. During a brake noise event, vehicle basic structure and suspension system components are excited due to brake system vibration and result in a resonance that is perceived in the form of a noise. Proposed work discusses an experimental study that is carried out on a commercial vehicle for addressing customer complaints regarding disc brake squeal and groan noise. Based on the preliminary inputs, vehicle level study was carried out in order to simulate the problem and objectively capture its severity.
2015-09-27
Technical Paper
2015-01-2689
Katsuhiro Uchiyama, Yuji Shishido
Last year we presented the FEA simulation of  “spring - mass (Pad’s shape) model” from stick-slip phenomenon for improvement of creep groan. Creep groan is one of representative groan noise on automobile brake system.    As a result of parameter study with various pad shape (chamfer, slot, etc.…), we showed that brake pad with radial slot angle has a range which increases creep groan performance.   This year we would like to present our study for advantageous direction for reduction of creep groan which will focus on friction material Mu vs. Velocity (M-V) property, friction material physical properties and relative velocity between brake pads and rotor by advanced brake assembly FEM model which considers torsional stiffness of suspension.
2015-09-27
Technical Paper
2015-01-2684
Seongjoo Lee, ShinWook Kim, ShinWan Kim, Seong Rhee
A correlation between brake squeal and disc wear was reported previously. This investigation was undertaken to confirm the correlation and to characterize the disc wear particles transferred to the sliding surface of the NAO pad. It is found that the iron distribution on the pad is very non-uniform; at some locations, the iron concentration reaches the level of Low Steel Lomets (15-20wt%); and squealing brakes exhibit increased amounts of transferred disc wear particles on the pad surface. These transferred particles are found as small and flattened thin metallic sheets, which are different from relatively large “metal pick-up” pieces.
2015-09-27
Technical Paper
2015-01-2683
Sarah Chen, Steve Hoxie
Developing a quiet brake system has been a constant task for OEM as well as their brake suppliers. Squeal problems may taint the image of a car manufacturer and cause substantial revenue loss from warranty claims despite the fact that the brake remains fully functional and safe. As a major component in the brake system, the rotor plays significant role in brake noise performance. Because of the cost and damping property advantages, gray iron is still the most widely used material for brake rotor application. When pads/rotor coupling is looked at to minimize noise issues, however, most efforts have been on pads and insulators. Rotor specifications are rather general and the component is typically accepted based on grades defined by mechanical property minimum (mostly in G3000 SAE J431).
2015-09-27
Technical Paper
2015-01-2702
Chihoon Jo, Jaeseung Cheon, Jongsung Kim, Yongsik Kwon
The EMB converts the electric set values into clamping forces at the brakes through an independent motor control at each wheel. EMB systems are now being developed by automobile part suppliers. In particular, as the market share of electrically powered vehicles, such as hybrid electric vehicles, elctric vehicle and fuelcell elctric vehicle, has expanded, the EMB makes it possible to recuperate the braking energy in the overall control loop of the braking unit, even in electrically powered vehicles. However, in order to commercialize, the EMB has many problems such as production competitiveness, reliability and regulations. A new concept, the Hybrid Electro-Mechanical Brake(hEMB) is characterized by a dual piston structure linked by hydraulics inside of the caliper. It is possible to reduce motor, actuator size and backup system in emergency through amplification of dual piston.[1] The hEMB is composed of caliper system, dual piston, screw, BLAC type motor and actuator.
2015-09-27
Journal Article
2015-01-2678
Diego Adolfo Santamaria Razo, Johan Decrock, Ann Opsommer, Maarten Fabré, Fernao Persoon
Friction performance is the consequence of the interaction between rotor and friction material surfaces. In order to stop the car, kinetic energy has to be transformed into heat, plastic deformations, chemical reactions and wear debris (1). The latest generates the formation of the so called third body layer and its initiation, growth and degradation will generate the actual friction coefficient and wear (2). Third body layer is composed by a semi continuous layer formed by primary and secondary plateaus (3) and its chemical composition depends upon the combination of compounds present in the friction material formulation, rotor chemical composition and quality, environmental conditions and testing procedures (2). Nevertheless some raw materials seem to promote third body layer formation more than others. The main chemical composition of the plateaus are iron oxide –probably coming from the rotor- copper, carbon, silicon and calcium (3).
2015-09-27
Journal Article
2015-01-2691
Ju Young Kim, Jeongkyu Kim, Young Min Kim, Wontae Jeong, Hojoon Cho
In the brake system, unevenly distributed disc-pad contact pressure distribution during braking is not only a loss of braking power but also a main cause of system instability which lead to squeal noise. In this reason there has been various attempts to measure contact pressure distribution. In the brake industry, static pressure distribution is measured and utilized to guess actual pressure distribution. In this study new test method is designed to quantitatively measure dynamic contact pressure distribution between disc and pad in vehicle testing. Upon various driving conditions and shape of pad, characteristics of dynamic contact pressure distribution were analyzed. Based on those results, analytical model updated and found to better detect propensity of brake squeal.
2015-09-27
Journal Article
2015-01-2682
Masaaki Nishiwaki, Ryutaro Misumi
High brake performance is required for vehicle safety. At the same time, mass reduction of brake system is also required for vehicle economic long run. Under these backgrounds, high friction coefficient pad materials come to be adopted for brake system. But it is well known that brake squeal is often caused by high friction coefficient pad materials. Therefore, brake squeal research is one of very important technical issues for vehicles design. Disc brake squeal is caused by small disturbance in dynamic unstable systems. Today, disc brake squeal can be simulated by FE Analysis in actual disc brake, but it is remained a technical issue of small disturbance, brake squeal trigger of friction force variation. Low-frequency disc brake squeal around 2 kHz can be caused by forced vibration during brake application, which is shown by N.Ishihara and me in references (1). This research suggests the trigger of disc brake squeal generation.
2015-09-15
Technical Paper
2015-01-2435
Ramakrishnan Murthy
One major problem that any product (say Motor, engines etc) which converts electrical energy into a mechanical energy would have is resonance. It has tendency to damage any material when the products operating frequency matches the resonant frequency. The major consequences of this resonant frequency in Flight at run-time could be catostrophic. Generally it is a practice to avoid running at the resonant frequency. This is done as a fixed method where the systems are designed not to run on resonant frequency, i.e. a subsystem in a system is now being designed for that system alone which will not match the resonant frequency. But the same subsystem may not be suitable for some other system. Hence this requires multiple designs. However this idea is to make a design generic where any subsystem can be used in any system irrespective of its resonant frequency. The technique uses the PID algorithm. This method will be helpful is having a single design for different systems.
2015-09-15
Technical Paper
2015-01-2605
Jamnie Yazmín Achem Calahorra, Hilda E. Esparza Ponce, Patricia Zambrano Robledo, Facundo Almeraya Calderón, Citlalli Gaona Tiburcio
Thin films deposited by magnetron sputtering are review in terms of their potential and present uses in the aircraft industry. The aircraft alloys substrates were Ti-6Al-4V and Incoloy 800H/HT, using a target of YSZ with nominal composition of 8% Y2O3 (wt%) and the remainder of ZrO2. The chemical composition of the films was determined by EDX. The electrochemical noise behavior show that the coatings decreased propagation of pitting, leading to a state of passivation or uniform corrosion, and also possess superior corrosion resistance over the individually substrates.
2015-09-15
Technical Paper
2015-01-2477
Alessandro Gardi, Roberto Sabatini
Abstract This paper presents the conceptual design of a new low-cost measurement system for the determination of pollutant concentrations associated with aircraft operations. The proposed system employs Light Detection and Ranging (LIDAR) and passive electro-optics equipment installed in two non-collocated components. The source component consists of a tuneable small-size and low-cost/weight LIDAR emitter, which can be installed either on airborne or ground-based autonomous vehicles, or in fixed surface installations. The sensor component includes a target surface calibrated for reflectance and passive electro-optics equipment calibrated for radiance, both installed on an adjustable support. The proposed bistatic system determines the column-averaged molecular and aerosol pollutant concentrations along the LIDAR beam by measuring the cumulative absorption and scattering phenomena along the optical slant range.
2015-09-15 ...
  • September 15-24, 2015 (4 Sessions) - Live Online
  • March 1-10, 2016 (4 Sessions) - Live Online
  • September 13-22, 2016 (4 Sessions) - Live Online
Training / Education Online Web Seminars
This four-session web seminar provides a detailed understanding of the source – path-receiver relationship for developing appropriate sound package treatments in vehicles, including automobiles, commercial vehicles, and other transportation devices. The course provides a detailed overview of absorption, attenuation (barrier), and damping materials and how to evaluate their performances on material, component, and vehicle level applications. A significant part of this course is the case studies that demonstrate how properly designed sound package materials successfully address vehicle noise issues.
2015-09-06
Technical Paper
2015-24-2526
Borislav Klarin, Thomas Resch, Chiara Sessarego, Giorgio Spanu, Gianni Lamonaca
This paper presents a methodology for numerical investigation of a full flexible balancer drive together with engine and crank train under realistic operating conditions where shaft dynamics, gear contact and rattle impacts, gear root stresses and friction losses in bearings and gear interaction are taken into account and can be balanced against each other to achieve the design criteria. Gear rattle is driven by the speed fluctuation of the crank train, the resistance torque (mainly friction), shaft inertia and the backlash in the gears. The actual trend to engine downsizing and up-torqueing increases the severity to rattle as engines are running on higher combustion pressures. This increases torque and speed fluctuation, which makes the detailed investigation in this torque transfer even more demanding. A common method to reduce gear rattle is the usage of so-called scissors gears.
2015-09-06
Journal Article
2015-24-2462
Fabio Auriemma, Heiki Tiikoja
The acoustic impedance exhibited by a new type of element for noise control, the Micro-Grooved Elements (MGEs), has been widely investigated in this paper. The MGEs are typically composed of two overlying layers presenting macroscopic slots and a number of micro-grooves on one of the contact surfaces. The micro-grooves result in micro-channels as the layers are assembled to form the element. Similarly to Micro-Perforated Elements (MPEs), the MGEs have been proved to provide effective dissipation of acoustic energy by the means of viscous losses taking place in the micro-channels. However, in contrast to the MPEs, the MGEs use the grooves, instead of the holes, in which the air is forced to pass through. It results in more cost effective elements, which have been found to represent an adequate alternative for fibrous materials, typically present in silencer units.
Viewing 1 to 30 of 7566

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