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2015-10-19 ...
  • October 19-20, 2015 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
Stringent requirements of reduced NOx emission limits in the US have presented engineers and technical staff with numerous challenges. Several in-cylinder technical solutions have been developed for diesel engines to meet 2010 emission standards. These technologies have been optimized and have yielded impressive engine-out results in their ability to reduce emissions to extremely low levels. However, current and state-of-the-art in-cylinder solutions have fallen short of achieving the limits imposed on diesel emissions for 2010.
2015-10-14
Event
2015-09-30 ...
  • September 30-October 1, 2015 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
As diesel emissions regulations have become more and more stringent, diesel particulate filters (DPF) have become possibly the most important and complex diesel aftertreatment device. This seminar covers many DPF-related topics using fundamentals from various branches of applied sciences such as porous media, filtration and materials sciences and will provide the student with both a theoretical as well as an applications-oriented approach to enhance the design and reliability of aftertreatment platforms.
2015-09-14 ...
  • September 14-15, 2015 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
Heat transfer affects the performance, emissions and durability of the engine as well as the design, packaging, material choice and fatigue life of vehicle components. This course covers the broad range of heat transfer considerations that arise during the design and development of the engine and the vehicle with a primary focus on computational models and experimental validation covering the flow of heat from its origin in the engine cylinders and its transfer via multiple paths through engine components.
2015-06-26 ...
  • June 26, 2015 (12:30 p.m. - 4:30 p.m.) - Grand Rapids, Michigan
Training / Education Classroom Seminars
The June offering of this seminar is held in conjunction with the SAE 2015 Noise and Vibration Conference and Exhibition. Register for this offering and you can register to attend the Noise and Vibration Conference 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 Noise and Vibration Conference and Exhibition for this special rate.
2015-06-25
Event
In this workshop, a design process for mufflers is offered. 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. 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.
2015-06-24
Event
This session covers experimental, computational, and analytical efforts related to the basic mechanisms and control techniques of noise and vibration in the breathing system (induction, combustion chamber, and exhaust) of naturally aspirated and supercharged/turbocharged engines. Noise sources include airborne, flow, flow‐acoustic and flow‐structure coupling.
2015-06-24
Event
This session covers experimental, computational, and analytical efforts related to the basic mechanisms and control techniques of noise and vibration in the breathing system (induction, combustion chamber, and exhaust) of naturally aspirated and supercharged/turbocharged engines. Noise sources include airborne, flow, flow‐acoustic and flow‐structure coupling.
2015-06-24
Event
This session covers experimental, computational, and analytical efforts related to the basic mechanisms and control techniques of noise and vibration in the breathing system (induction, combustion chamber, and exhaust) of naturally aspirated and supercharged/turbocharged engines. Noise sources include airborne, flow, flow‐acoustic and flow‐structure coupling.
2015-06-15
Technical Paper
2015-01-2310
Edward Ray Green
The Sound Transmission Loss of automotive intake and exhaust components is commonly measured using the four microphone tube method per ASTM E2611. Often area adapters are used to match the component tube to that of the tube apparatus. These area adapters affect the Sound Transmission Loss measurement, especially at very low frequencies. The use of the Transfer Matrix Technique to remove the affect of the area adapters is described. The improvements for step and cone area adapters are compared.
2015-06-15
Technical Paper
2015-01-2317
Zhenlin Ji, Yiliang Fan
A simulation program named as MAP (Muffler Analysis Program) is developed for the rapid calculation and analysis of acoustic characteristics of duct muffling systems. The program is based on the plane wave theory and uses the Visual Basic 6.0 to create a friendly GUI (Graphic User Interface) for input of the geometrical and physical parameters to build and modify the duct muffling systems quickly. The relation among the duct acoustic elements is established by using the transfer matrix method, and the Transmission Loss (TL) and Insertion Loss (IL) may be calculated, and then the results are plotted in terms of curve. Map allows designer to change parameters of the duct muffling systems expediently, to investigate the effects of design changes on the acoustic characteristics and finally to get an acceptable solution.
2015-06-15
Technical Paper
2015-01-2311
Aditya Palsule, Arun Budama, Nandakumar Somasundaraeswer
Development of split Catcon-Muffler system was done to be used in front engine low floor (FELF) bus from perspective of cost saving, modularity and reduction in complexity. This system is developed as an alternate to an existing solution of integrated Catcon and muffler. The paper describes the development of a split Catcon and muffler exhaust system for a FELF bus, so as to meet cost and time considerations. The development had to achieve a feasible muffler + catalytic converter solution, which could be installed within the packaging volume of the existing configuration, while meeting the regulatory requirements for Pass by noise (PBN), and at the same time conforming to backpressure limits set for optimum engine performance. Multiple design – prototypes – test iterations were carried out to meet the PBN and back pressure target of engine. The final solution was developed which achieved both the requirements within the specified space constraints.
2015-06-15
Technical Paper
2015-01-2313
Bryce Gardner, Abderrazak Mejdi, Chadwyck Musser, Sébastien Chaigne, Tiago De Campos Macarios
Flow strongly affects the propagation of acoustics wave transmission within a duct and this must be addressed by the vibro-acoustic modelling of duct systems subject to uniform or non-uniform flow. Flow impacts both the effective sound propagation speed in a duct and refracts the sound towards or away from the duct walls depending on whether the acoustic waves are propagating in the direction of the flow or against the flow. Accurate modeling of the acoustic propagation within a duct is crucial for design and “tuning” of muffler systems that need to strongly attenuate narrowband acoustic sources from the engine. Muffler systems that may avoid matching acoustic resonances to engine narrowband sources when no flow is present may experience shifting of resonances to frequencies that match engine sources and cause problems when the flow during a real operating condition is present.
2015-06-15
Technical Paper
2015-01-2233
Hudson P. V, V Shivaraj, Sukumar T, Suresh Gaikwad
Generally the brake system products are mounted on chassis with brackets which are subjected to dynamic loads due to road undulations. Exhaust brake is used to restrict the engine exhaust flow passage and thereby creates a back pressure in the engine for reducing the engine speed. This in turn reduces the vehicle speed. This is widely used in the vehicles operating in the hilly areas. This product is mounted on the exhaust passage and the air cylinder sub-assembly which actuates the exhaust brake is mounted on a bracket. Automotive industries perform durability tests on vehicles to reduce the failure on end-user environment. An assembly which has cleared the durability test got failed on addition of a spring into the assembly. The inclusion of spring is for enhancing the performance of the overall assembly. This paper deals with investigations carried out using finite element method (FEM) to study the effect of spring on the assembly and to propose a design solution for the failure.
2015-06-15
Technical Paper
2015-01-2309
David Neihguk, M.L. Munjal, Abhinav Prasad
The bias flow in concentric tube resonator is a flow-induced phenomenon in which the pressure gradient along the radial direction is produced by the kinetic energy of the flow. As a result, the flow dynamics in concentric tube resonators is characterized by bias flow into the annular cavity in the upstream and outflow from the annular cavity in the downstream of the flow. This is due to the change in direction of the radial component of the bias flow at a point called the point of recovery, as a consequence of mass conservation. The pressure drop of concentric tube resonator is a complex function of the momentum flux and other geometric parameters such as porosity, open area ratio, discharge coefficient of the perforated holes, bias inflow, bias outflow, grazing flow and length. In this study, numerical experiments are conducted to obtain an empirical formula for the friction factor of perforated pipes which are extensively used in automotive mufflers.
2015-06-15
Technical Paper
2015-01-2308
Yitian Zhang, David W. Herrin
The two-load method is commonly applied to determine the transmission loss for a muffler especially if an impedance tube rig is used. In this paper, several practical concerns are considered including (1) the choice of data processing algorithm (transfer or scattering matrix), (2) the selection of reference, (3) the use of 2 or 4 microphones, and (4) the influence of external noise. Results are compared for an expansion chamber and also for a more effective cross flow type muffler.
2015-06-15
Technical Paper
2015-01-2211
Michael J. Santora, Dillon Savage
In the present study by the University of Idaho Clean Snowmobile Challenge (UICSC) team, the necessity, history, and research of noise reduction strategies in two-stroke snowmobile exhaust is presented. Testing and design is discussed to show the decision making process of College Design Series (CDS) teams. The UICSC CDS team is comprised of mechanical, electrical, and computer engineers. The development from static to dynamic noise cancellation is explained as a proof of concept and to further demonstrate CDS design. The study presents math models that validate each noise reduction technique. The noise reduction includes both a mechanically active quarter-wave resonator (MAQR) and mechanically active Helmholtz resonator (MAHR). Viability is given for both design types. These are presented with supporting implementation data. Control for both resonator platforms is discussed. The relative effect of each technology is compared based off cost and packaging.
2015-06-15
Technical Paper
2015-01-2266
Andrzej Pietrzyk
Several of the exterior noise sources existing around a vehicle can cause airborne noise issues at relatively low frequencies. One of them is exhaust pipe orifice noise. Traditional methods for handling airborne noise in vehicles, such as SEA, are not suitable for the frequency range of interest. Finite Element analysis has been used, but it often ends up with very heavy runs if semi-infinite acoustic elements are used at the outer boundary as the solution has to be direct instead of modal in this case. There are, however, some softwares that can handle this calculation relatively efficiently. One of the primary choices could be FFT&Actran. However, recently, a similar capability has been developed in MSC Nastran. Also, the calculations involving the free field impedance conditions have been made extremely efficient in CDH/AMLS. Including the poro-elastic material model for foam-based carpets is also becoming practically possible.
2015-06-15
Technical Paper
2015-01-2306
John G. Cherng, Weiwei Wu, Peiran Ding, Mike Hebbes, Henry Zhang
This study presents an efficient method to optimize the transmission loss of a vehicle muffler by using both experimental and analytical methods. Two production mufflers with complex participation and absorption fiber glass were selected. CAD files of the mufflers were established for developing FEM models in ANSYS and another commercial software. FEM models were validated by two experimental measurements; decomposition method and two source methods. After the models were verified, sensitivity studies of design parameters were performed to optimize the TL of a selected muffler. The sensitivity study includes the perforated hole variations, partition variations and absorption material insertion. The experience learned and sensitivity conclusions are included in the paper.
2015-06-15
Technical Paper
2015-01-2318
Wang Wenzhu, Liu Gang, Cheng Mianhong, Wei Jun
The hanger location layout is crucial, because it is related to the rubber hanger life, the natural frequency of the exhaust system and the force transferred to the body from the exhaust system. In order to solve the hanger layout problem of a new developed automotive exhaust system, the finite element method (FEM) of the automotive exhaust system including the powertrain was established. The correctness of the FEM model was verified by means of experimental modal analysis. Using average driving DOF displacement (ADDOFD) method, the hanger Location was arranged. The static and vibration analysis of the exhaust system was carried out to verify the hanger location layout. The weight analysis results indicate that the maximum displacement of the rubber hanger satisfies the design requirements. The static analysis results under 4g acceleration indicate the maximum stress meets the strength requirements of the material.
2015-06-15
Journal Article
2015-01-2316
Weam Elsahar, Tamer Elnady
In several applications, two-inlet single outlet mufflers are possible to encounter in exhaust systems. They are usually used to merge two exhaust streams from two similar engines or from two sides of an engine. They have an advantage of reducing the back pressure on the engine(s). There is a lot of published research on the analysis of single inlet single outlet mufflers acting as a two-port. On the other hand, there are a few publications on the analysis of two-inlet single outlet mufflers due to their complexity representing a three-port. A three-port is characterized by a 3×3 Scattering Matrix. The nine elements of this matrix represent the 3 reflection coefficients at each port, and the 6 transmission coefficients between the 3 ports in both directions. In this work, a two-inlet single outlet muffler is studied. The elements of the scattering matrix were measured using the two-source two-microphone technique with and without flow.
2015-06-15
Journal Article
2015-01-2314
Adrien Mann, Min-Suk Kim, Barbara Neuhierl, Franck Perot, Robert Powell, Thomas Rose, Jan Krueger
Exhaust and muffler noise is a challenging problem in the transport industry. While the main purpose of the system is to reduce the intensity of the acoustic pulses originating from the engine exhaust valves, the back pressure induced by these systems must be kept to a minimum to guarantee maximum performance of the engine. Emitted noise levels have to ensure comfort of the passengers and must respect community noise regulations. In addition, the exhaust noise plays an important role in the brand image of vehicles, especially with sports car where it must be tuned to be “musical”. However, to achieve such performances, muffler and exhaust designs have become quite complex, often leading to the rise of undesired self-induced noise. Traditional purely acoustic solvers, like Boundary Element Methods (BEM), have been applied quite successfully to achieve the required acoustic tuning.
2015-06-15
Journal Article
2015-01-2305
Xin Hua, David W. Herrin, Yitian Zhang
A recently developed superposition approach for determining the transmission and insertion loss of a two-inlet muffler is reviewed. To validate the approach, calculated and measured transmission and insertion losses are compared for a small engine muffler with two inlets and one outlet. After which, the phasing between the two inputs is varied and the transmission and insertion loss evaluated. Results show that the transmission and insertion loss are strongly affected by the phasing between sources at low frequencies while phasing between sources has a lesser impact at high frequencies.
2015-06-15
Journal Article
2015-01-2312
P. Wang, J. Li, T. W. Wu
A simplified method to model perforated tubes in mufflers is the equivalent transfer impedance approach. Various empirical formulas that consider the porosity, hole diameter, wall thickness, and flow type have been proposed to date. They normally work very well under the conditions that the formulas are intended for. However, there are situations that the empirical formulas may not be able to cover. In this paper, we propose a simple BEM-based numerical procedure to determine the transfer impedance from a small perforate sample, and then send the transfer impedance to the muffler BEM model for analysis purposes. Numerical results are verified in three test cases.
2015-06-15
Journal Article
2015-01-2307
Neil Figurella, Rick Dehner, Ahmet Selamet, Keith Miazgowicz, Ahsanul Karim, Ray Host
The effect of aerodynamically induced pre-swirl on the acoustic and performance characteristics of an automotive centrifugal compressor is studied experimentally on a steady-flow turbocharger facility. Accompanying flow separation, broadband noise is generated as the flow rate of the compressor is reduced and the incidence angle of the flow relative to the leading edge of the inducer blades increases. By incorporating an air jet upstream of the inducer, a tangential (swirl) component of velocity is added to the incoming flow, which improves the incidence angle particularly at low to mid-flow rates. Experimental data for a configuration with a swirl jet is then compared to a baseline with no swirl. The induced jet is shown to improve the surge line over the baseline configuration at all rotational speeds examined, while restricting the maximum flow rate. At high flow rates, the swirl jet increases the compressor inlet noise levels over a wide frequency range.
2015-06-15
Journal Article
2015-01-2315
Giulio Lenzi, Giovanni Ferrara, Andrea Fioravanti
The acoustic performance of muffler with single-inlet and single-outlet are well-described using Insertion Loss (IL) and Transmission Loss (TL). These parameters represent the acoustic damping on the engine emission and on the incident pressure wave respectively. However, for mufflers with multi-inlet these parameters depend also on the sources characteristics as consequence their use is quite difficult. In the present work the acoustic performance of a double-inlet and single-outlet muffler are experimentally evaluated in terms of reflection and transmission coefficients of each port of the muffler itself. These coefficients are used to evaluate the Insertion Loss of the manifold muffler taking in to account specific sources on the inlets. The characteristic coefficients are also used to predict the acoustic emission of the manifold muffler using a known engine source on the two inlets.
2015-04-23
Event
This session describes the design, modeling and performance validation of cylinder heads, lubrication pumps, intake manifolds, exhaust manifolds, and engine block structures.
2015-04-23
Event
This session covers the complete particulate filter system, from particle deposition, new cell geometries to DPF regeneration. There are also several presentations on ash deposition and how to measure the ash in the DPF.
2015-04-23
Event
This session investigates a new plasma ignited burner for DPF regeneration and a new DPF substrate for SCR on the filter plus one presentation on optimizing a DOC for DPF systems.
Viewing 1 to 30 of 3531

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