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Numerical Study of the Maximum Impact on Engine Efficiency When Insulating the Engine Exhaust Manifold and Ports During Steady and Transient Conditions

Universitat Politècnica de València-Alberto Broatch, Pablo Olmeda, Jaime Martin, Amin Dreif
  • Technical Paper
  • 2020-37-0002
To be published on 2020-06-23 by SAE International in United States
In the present work, a study about the impact on engine performance, fuel consumption and turbine inlet and outlet temperatures adding thermal insulation to the exhaust ports, manifold and pipes before the turbocharger of a 1.6L Diesel engine is presented. First, a 0D/1D model of the engine was developed and thoroughly validated by means of an extensive testing campaign. The validation was performed by means of steady state or transient running conditions and in two different room temperatures: 20ºC and -7ºC d. Once the validation was complete, in order to quantify the significance of adding thermal isolations, the simulations were performed setting the exhaust air path before the turbine as adiabatic. This is evaluated the maximum gain of the technology. Results showed that the thermal insulation proved to have a great potential in regard to T4 increase since this would reduce the warm up time of the aftertreatment systems. However, its impact on engine efficiency was limited in both steady and transient conditions.
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Asian Consumers Challenging the NVH Performance of European Cars – Implications on the Product Development in the 2020ies

MAGNA STEYR Automotive Technologies-Paulo Padilha
NVH Experts-Christoph Fankhauser
  • Technical Paper
  • 2020-01-1552
To be published on 2020-06-03 by SAE International in United States
Sales of SUV and luxury cars on the largest market of the world – China – are growing at a high rate. The highways in large cities like Beijing or Shanghai are increasingly populated with cars from all over the world like Japan, USA, Europe and Korea and even some refined domestic brands. More than 10 million rich people can afford those cars and are skilled drivers. This huge group of potential consumers is targeted by luxury brand OEMs and by startup companies. It has been understood, that these people have a strong attitude towards comfort. The twistbeam rear axle was replaced by multilink, double clutch transmissions were improved by comfort-mode drive programs, interior trims raised to Western standard performance levels, tyres specially developed for comfort in China, localized insulation materials and packages engineered to a one vehicle class higher level. The European avant-garde is capable of such high levels of complete vehicle NVH performance, whereas premium brands often compromise NVH with respect to high vehicle dynamics performance and passive safety requirements. At the same…
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Impact of Manufacturing Inaccuracies on the Acoustic Performance of Sound Insulation Packages With Plate-like Acoustic Metamaterials

Hamburg University of Applied Sciences-Felix Langfeldt, Wolfgang Gleine
  • Technical Paper
  • 2020-01-1562
To be published on 2020-06-03 by SAE International in United States
Thin plate-like metamaterials (e.g. membrane-type acoustic metamaterials or inhomogeneous plates) have a high potential for improving the sound transmission loss of sound insulation packages, especially in the challenging low-frequency regime. These types of metamaterials have been previously shown to achieve very high sound transmission loss values which can exceed the corresponding mass-law values considerably. However, like many other metamaterial realizations, their extraordinary acoustical performance relies on the periodicity of the sub-wavelength sized unit cells. In particular, for plate-like acoustic metamaterials (PAM) most theoretical and numerical investigations assume a perfect placement of equal added masses - an idealization which cannot be achieved in industrial manufacturing of these metamaterials. This contribution investigates the impact of randomized inaccuracies that can occur in manufacturing on the sound reduction behavior of PAM. First, a numerical model of a finite sized PAM is validated using sound transmission loss measurement data. Then, the simulation model is modified to incorporate randomly varying geometrical parameters of the added masses (such as mass placement, size, etc.). The parameters are randomized according to a Gaussian distribution…
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Materials Characterisation Techniques Used to Develop Polyurethane Foams for Automotive NVH Applications

Huntsman-Mark Brennan, Martino Dossi, Maarten Moesen, Jan Vandenbroeck
  • Technical Paper
  • 2020-01-1529
To be published on 2020-06-03 by SAE International in United States
The versatility of polyurethane foam chemistry enables its use in a wide variety of automotive noise and vibration applications. These include low density sound absorbing foam materials with tailored foam microstructures for engine applications and sound insulating viscoelastic materials for carpets and dash insulators. This paper will demonstrate techniques used to develop new NVH materials. For example, X-ray computed tomography (micro-CT) is used to characterise the 3D cellular microstructure of a variety of foams, a key attribute for sound absorbing materials. Dynamic mechanical analysis (DMA) is required to understand the frequency dependent elasticity and damping properties of polyurethane polymer materials in foams, important for structure-borne vibrations. Foam materials are highly non-linear, even at small loads, so techniques such as digital image correlation are used to study non-linear foam elasticity and Poisson’s ratio. These methods are used to aid interpretation of electromagnetic shaker and acoustic impedance tube measurements of polyurethane foams via higher level poro-elastic models. From this a library of four pole transfer matrices for various materials can be obtained and absorption, reflection and transmission…
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Study of the Noise Contributors on the Interior Acoustic of a Car and Their Countermeasures

Autoneum Holding AG-Thibault Lafont, Claudio Bertolini
Saint-Gobain-Fabien Dalzin, Fabien Bouillet
  • Technical Paper
  • 2020-01-1585
To be published on 2020-06-03 by SAE International in United States
This paper shows that the collaboration between a glass manufacturer and a passive acoustic treatment manufacturer can bring different benefits and considerably improve the interior acoustics of a vehicle. In terms of passenger safety and well-being, glazing have always played a key role by offering solutions to interior comfort, particularly when it comes to heat and acoustics. Today, cars are becoming a living space which from an acoustic point of view brings a challenge for the interior comfort. Indeed, glazing has no absorption and classically it has an acoustic insulation weakness around its coincident frequency. In most of the cases, these different aspects make glazing one of the main contributors to the sound pressure level in the passenger compartment, and the trend is not one of change. However, there are possible countermeasures. One of which is the use of laminated glazing with acoustic PVB. This solution allows to reduce the loss of insulation performance at the coincidence frequency. The other is the usage of passive interior acoustic trims. When properly positioned and optimized, the latter…
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CVT cooling of a BAJA All-Terrain Vehicle

Maharaja Agrasen Inst Of Technology-Neelesh Dayal, Mukul Singh, Rakesh Saini
Maharaja Agrasen Inst. Of Technology-Vasu Bhardwaj
  • Technical Paper
  • 2020-28-0020
To be published on 2020-04-30 by SAE International in United States
This research paper concentrates on BAJA ATV CVT premises thermal cooling. BAJA event has a 4-hour endurance run, which demands full potential from the drivetrain. In our drive train assembly, we have used CVT coupled with fixed reduction gearbox, while having long run the temperature of CVT unit increases so much that it hinders the efficiency. The main heat generation sources in the CVT chamber is the engine, friction between belt and sheaves, and high ambient outside. It is learned that the CVT working temperature should be reduced. Hence cooling was much required for optimum performance of our vehicle, implemented cooling system involves insulation of CVT from engine while having a passive heat exchanger using super absorbent polymer inside our vehicle to inject cool air on CVT and using insulating material on CVT cover to reduce the overall temperature, whereas passive heat exchanger cools down the injected air. All this leads to a significant temperature drop in the whole assembly.
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WIRE, ELECTRICAL, POLYTETRAFLUOROETHYLENE/POLYMIDE INSULATED, LIGHT WEIGHT, SILVER COATED, HIGH STRENGTH OR ULTRA HIGH STRENGTH COPPER ALLOY, 200 °C, 600 VOLT, ROHS

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS22759/81C
  • Current
Published 2020-03-24 by SAE International in United States
No Abstract Available.
This content contains downloadable datasets
Annotation ability available
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TERMINALS, LUG AND SPLICES, CONDUCTOR, CRIMP STYLE, COPPER TERMINAL, LUG, INSULATED, TIN WHISKER RESISTANT, RING TONGUE, BELL-MOUTHED, TYPE II, CLASS 1 (FOR 150 °C TOTAL CONDUCTOR TEMPERATURE)

AE-8C2 Terminating Devices and Tooling Committee
  • Aerospace Standard
  • AS7928/13C
  • Current
Published 2020-03-24 by SAE International in United States

SCOPE IS UNAVAILABLE.

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WIRE, ELECTRICAL, POLYTETRAFLUOROETHYLENE/POLYMIDE INSULATED, LIGHT WEIGHT, SILVER COATED, COPPER CONDUCTOR, 200 °C, 600 VOLT, ROHS

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS22759/91C
  • Current
Published 2020-03-24 by SAE International in United States
No Abstract Available.
This content contains downloadable datasets
Annotation ability available
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WIRE, ELECTRICAL, POLYTETRAFLUOROETHYLENE/POLYMIDE INSULATED, LIGHT WEIGHT, NICKEL COATED, HIGH STRENGTH OR ULTRA HIGH STRENGTH COPPER ALLOY, 260 °C, 600 VOLT, ROHS

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS22759/82C
  • Current
Published 2020-03-24 by SAE International in United States
No Abstract Available.
This content contains downloadable datasets
Annotation ability available