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Статті в журналах з теми "Automobiles Motors Exhaust systems Noise"
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Gerges, Samir N. Y., Márcio R. Kimura, and J. L. Bento Coelho. "Acoustic Modelling and Measurements of Engine Mufflers." Building Acoustics 5, no. 1 (March 1998): 27–38. http://dx.doi.org/10.1177/1351010x9800500103.
Повний текст джерелаАнотація:
Most buildings such as hospitals, hotels, governmental offices, data processing rooms, etc, are equipped with internal combustion engines, diesel motors and generators to supply energy in emergencies. These same IC engines are used for industrial applications, building services and transportation. Exhaust noise are the predominant noise source with most internal combustion engines and thus exhaust systems incorporating mufflers have been designed to reduce the noise. This paper describes the analysis of several configurations of mufflers and also presents comparisons between the results for the transmission loss obtained by numerical modelling (FEM), Transfer Matrix Method (TMM) and measurements.
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Pokusaev, Mikhail Nikolaevich, Konstantin Evgenievich Khmelnitsky, Alexei Alekseevich Kadin, and Alexei Viktorovich Sergeev. "Design and evaluating efficiency of gas exhaust system silencer of outboard motor SEA PRO 2.5." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2021, no. 1 (February 26, 2021): 81–87. http://dx.doi.org/10.24143/2073-1574-2021-1-81-87.
Повний текст джерелаАнотація:
The article presents the results of developing and evaluating the effectiveness of the silencer of outboard motor SEA PRO 2.5 made in China. The experiments were carried out in a large experimental pool of Astrakhan State Technical University, with the use of a noise meter-spectrum analyzer Ecophysics-110 of the first class, with the software Signal+3G Light. In the theoretical analysis of the development, it has been suggested that the efficiency of silencers of exhaust systems of outboard motors could have a smaller effect than with cars, since at underwater exhaust the noise reduction will occur from the water layer when the motor is submerged. It has been proved that using a silencer in underwater exhaust systems of outboard motors can increase the aerodynamic drag for gases and reduce power. To test the theoretical assumptions, there was made a silencer for the gas exhaust system of the outboard motor SEA PRO 2.5 from stainless steel perforated sponge. It was determined that the net effect of the silencer (excluding water silencing) could be heard at low frequencies (up to 125 Hz) and makes up to 12.7 dba at full speed of the motor. The average equivalent sound level is reduced up to 4.5 dba at low speed, and at full speed of the outboard motor is practically not evident. In addition, the outboard motor noise level was reduced by water and made at full speed up to 22 dba for frequencies over 2000 Hz; for average equivalent noise level it made 15 dba. The combination of noise reduction by water and by a silencer helps to reduce noise at low and high sound frequencies, which is a positive effect of the developed device.
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Pobedin, A. V., M. V. Lyashenko, M. V. Shekhovtsov, and A. A. Dolotov. "Method of calculation of probabilistic estimation of noise emitted by passenger automobile aggregates." Izvestiya MGTU MAMI 11, no. 1 (March 15, 2017): 40–46. http://dx.doi.org/10.17816/2074-0530-66910.
Повний текст джерелаАнотація:
The article deals with the problem of noise reduction of vehicles. Noise pollution is an important environmental problem. Currently, the level of urban traffic noise varies from 70 to 95 dBA, which significantly exceeds the current sanitary standards. The main source of vehicle noise is the engine and its systems. In the engine noise, the component caused by the combustion process and mechanical component are mentioned. The next most important source of noise are transmission units. In them, noise is generated by gears, bearings and fast rotating shafts. Tires of a moving vehicle are one of the main sources of vibration and noise at high speeds (from 80-90 km / h). Sources of noise of aerohydrodynamic origin are stationary or nonstationary processes in gases. One of the most intense aerodynamic sources of noise is vortex formation in flowing parts of mechanisms. When the vehicle is moving in the air stream, it is a source of turbulence, so noise increases with increasing speed. The authors carried out a number of experimental studies of the noise emission of individual units of a automobile - engine, gearbox, cardan gear, differential, exhaust system. Taking into account the results of experimental studies, a technique is proposed for the probabilistic calculation of the vehicle noise. A mathematical model is developed for calculating the expected noise in the passenger compartment of passenger automobiles, which allows obtaining not only the mathematical expectation of noise levels from each unit and its spectral components, but also their dispersion. On the basis of the model, a program has been created that makes it possible to obtain the spectral noise components from each of the sources in one-third octave bands with an estimate of the probable range of their values (confidence intervals) even at the design stage of the vehicle, which allows us, at the design stage, to lay down the necessary characteristics of the noise emission of aggregates and the automobile as a whole. The created technique can be successfully used also for an estimation of characteristics of noise emission of other vehicles - cargo and other automobiles, buses, wheeled and caterpillar tractors, agricultural machines.
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Kumar, V. Ram, and M. L. Munjal. "Plane wave frequency domain analysis of resonance free pipes with moving medium." Noise Control Engineering Journal 67, no. 6 (November 1, 2019): 467–82. http://dx.doi.org/10.3397/1/376743.
Повний текст джерелаАнотація:
Mufflers are inevitably a significant part of the exhaust systems of automobiles for bringing down the tail-pipe noise levels. Nevertheless, howsoever well-optimized a reasonably large muffler volume be (with respect to insertion loss, back pressure, breakout noise, flow noise, etc.), there are inevitably acoustic modes present, which lead to peaks in the noise levels and corresponding troughs in the insertion loss (IL) of an exhaust baseline. These acoustic modes are: (i) muffler internal modes, (ii) axial pipe modes and (iii) system modes. Of these, the axial pipe mode is the most detrimental one. Usage of microperforated (MPA) patches along long pipes at locations of sound pressure anti-nodality to dampen their resonances has proved to be an efficient acoustic solution. All the works reported so far on these resonance free pipes with such patches have been using 3D FEM or vehicle testing. This article discusses their acoustic performance employing linear plane wave theory. The predicted acoustic behavior comes in-line with those of published resources. Also, the flow leakage through the open patches and the corresponding attenuation impact have been demonstrated. It has been shown that the seemingly inconsequential leakage deteriorates the patch acoustics considerably. This result is verified with the published claims, thereby further validating the 1D analysis presented here. Also, the 1D approach has a scope for valuable benchmarking of resonance free pipes (RFPâ,,¢) in industry since it does not suffer any intrinsic modeling deficiency unlike some commercial simulation solvers. The article, thus, presents, validates and illustrates the potential of linear acoustic analysis toward the acoustic assessment and optimization of RFPs.
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Litwin, Wojciech, Wojciech Leśniewski, and Jakub Kowalski. "Energy Efficient and Environmentally Friendly Hybrid Conversion of Inland Passenger Vessel." Polish Maritime Research 24, no. 4 (December 20, 2017): 77–84. http://dx.doi.org/10.1515/pomr-2017-0138.
Повний текст джерелаАнотація:
Abstract The development and growing availability of modern technologies, along with more and more severe environment protection standards which frequently take a form of legal regulations, are the reason why attempts are made to find a quiet and economical propulsion system not only for newly built watercraft units, but also for modernised ones. Correct selection of the propulsion and supply system for a given vessel affects significantly not only the energy efficiency of the propulsions system but also the environment - as this selection is crucial for the noise and exhaust emission levels. The paper presents results of experimental examination of ship power demand performed on a historic passenger ship of 25 m in length. Two variants, referred to as serial and parallel hybrid propulsion systems, were examined with respect to the maximum length of the single-day route covered by the ship. The recorded power demands and environmental impact were compared with those characteristic for the already installed conventional propulsion system. Taking into account a high safety level expected to be ensured on a passenger ship, the serial hybrid system was based on two electric motors working in parallel and supplied from two separate sets of batteries. This solution ensures higher reliability, along with relatively high energy efficiency. The results of the performed examination have revealed that the serial propulsion system is the least harmful to the environment, but its investment cost is the highest. In this context, the optimum solution for the ship owner seems to be a parallel hybrid system of diesel-electric type
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Shyamala, Ch. "DESIGN AND DEVELOPMENT OF ANTI-LOCK BRAKING SYSTEM FOR ELECTRIC VEHICLE." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 06, no. 05 (May 19, 2022). http://dx.doi.org/10.55041/ijsrem13443.
Повний текст джерелаАнотація:
Modern automobiles are more than just mechanical gadgets. Because of the connectivity which is increased between the vehicular networks and the present outside world, hackers now have more security flaws via which they can cause exploitations of a vehicular network. The CAN network that is controlled area network is a common communication bus protocol that helps ECU that is electronic control units in a vehicular network to communicate with one another. The safety systems which connect to network, on the other hand, are particularly vulnerable to malicious internal or external assaults due to their varied security flaws. This study presents a new way for introducing a Message Authentication System to enhance CAN security. The electric vehicle is basically driven by the lithium-ion battery coupled to hub motor. The motor needs a power supply to run which can be from an array of source. Electric vehicles do not emit any carbon dioxide because they are fuelled by electricity rather than any other fuel. Carbon dioxide contributes to the greenhouse effect. The design of the electric vehicle includes Hub motor which is brushless dc motor the outer part which rotates is called rotor and permanent magnets is used above the rotor inner part is called as stator and windings are used above it. Hence hub motors are dc motors as they work on dc voltage. Lithium-ion battery is made up of anode, cathode, electrolyte and two current collectors (positive and negative). Li-ion batteries can be recharged 100 times and are more stable. Henceforth, high efficiency with less noise and environment friendly electric vehicle is designed. The method that is proposed and implemented in a MATLAB and Simulink of CAN-based in the networks of the vehicle design along with ABS. By introducing additional security characteristic information unique to each transmitted CAN packets, model that applies Authentication of messages with a safety mechanism for any unknown detection that is intruded. The suggested method's result analysis revealed the fact that the feature which is security
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Shyamala, Ch. "DESIGN AND DEVELOPMENT OF ANTI-LOCK BRAKING SYSTEM FOR ELECTRIC VEHICLE." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 06, no. 05 (May 18, 2022). http://dx.doi.org/10.55041/ijsrem13337.
Повний текст джерелаАнотація:
Modern automobiles are more than just mechanical gadgets. Because of the connectivity which is increased between the vehicular networks and the present outside world, hackers now have more security flaws via which they can cause exploitations of a vehicular network. The CAN network that is controlled area network is a common communication bus protocol that helps ECU that is electronic control units in a vehicular network to communicate with one another. The safety systems which connect to network, on the other hand, are particularly vulnerable to malicious internal or external assaults due to their varied security flaws. This study presents a new way for introducing a Message Authentication System to enhance CAN security. The electric vehicle is basically driven by the lithium-ion battery coupled to hub motor. The motor needs a power supply to run which can be from an array of source. Electric vehicles do not emit any carbon dioxide because they are fuelled by electricity rather than any other fuel. Carbon dioxide contributes to the greenhouse effect. The design of the electric vehicle includes Hub motor which is brushless dc motor the outer part which rotates is called rotor and permanent magnets is used above the rotor inner part is called as stator and windings are used above it. Hence hub motors are dc motors as they work on dc voltage. Lithium-ion battery is made up of anode, cathode, electrolyte and two current collectors (positive and negative). Li-ion batteries can be recharged 100 times and are more stable. Henceforth, high efficiency with less noise and environment friendly electric vehicle is designed. The method that is proposed and implemented in a MATLAB and Simulink of CAN-based in the networks of the vehicle design along with ABS. By introducing additional security characteristic information unique to each transmitted CAN packets, model that applies Authentication of messages with a safety mechanism for any unknown detection that is intruded. The suggested method's result analysis revealed the fact that the feature which is security that has been proven to be very effective method that detects and blocks any third-party that has been intruded into the anti-lock braking system through the controlled area network bus protocol, The stability is maintained between all coupled Electronic control units. Hence method that is implemented with the design of electric vehicle gives the best results of the output.
Дисертації з теми "Automobiles Motors Exhaust systems Noise"
1
Bell, Arthur. "The effect of fuel formulation on the exhaust emissions of spark ignition engines." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019.1/1335.
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Toral, del Rio Maria Isabel. "An analysis of the influence of phosphorus poisoning on the exhaust emission after treatement systems of light-duty diesel vehicles." Thesis, Nelson Mandela Metropolitan University, 2007. http://hdl.handle.net/10948/697.
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Climate change has become a discussion topic of exponentially increasing urgency and importance amoung world leaders of all disciplines. These changes are brought about by the emission of so-called Greenhouse gases from various human activities. The primary cause of CO2 emissions is the burning of the Earth’s supply of nonrenewable natural fossil fuels like coal, oil and natural gas. The world first agreed on the prevention of “dangerous” climatic changes at the Earth Summit in 1992. The Kyoto Protocol of 1997 was the first step toward protection of the atmosphere and prescribes restrictions on emission pollutants. Since then the vehicle gas emissions are being controlled by means of different gas emissions norms, like the European Union Norm in Europe. The automotive manufacturers and suppliers are collectively working on reducing overall vehicle emissions. They are focusing on several different emission limiting possibilities, for example improved engine design, special fuel development and exhaust gas treatment systems. The exhaust gas treatment process requires continuous controlling and management of the exhaust gas emissions while driving a vehicle. Certain factors such as high emission temperatures have a negative influence on the life span of these systems. Their functionality and durability is also known to be reduced by the presence of chemical poisoning species like sulphur, phosphorus, zinc and calcium. The chemical poisoning species are produced during combustion of fuel and engine oil. They are therefore contained in the exhaust emissions and can poison the catalyst when passing over it. Phosphorous poisoning is particularly problematic and should be reduced considerably. This study involves the investigation of the phosphorous poisoning process and aims to provide clarity regarding the influences of different fuel and oil compositions on the severity of the process. Engine oil and biodiesel are two major sources of phosphorous poisoning. The phosphorus contained in biodiesel fuel is a natural component and can be minimized during the refining procedure. In contrast to others studies, the biodiesel fuel used during this project was SME (Soya Methyl Ester) with a 20% biodiesel content. This choice of fuel was made because of the increasingly important role that this type of biodiesel is playing in the European market and the future tendency to increase the percentage of biodiesel in the mixture with standard diesel fuel. The phosphorus contained in engine oil is a necessary additive to retain the antioxidant and anti-wear properties of the oil. This study examined the poisoning influences from the most commonly used phosphorus containing oil additive, Zinc Dithiophosphates (ZDDP), as well as a Zn-free, phosphorus containing anti-wear oil additive. This formulation provides information about the phosphorus poisoning process as caused by the engine oil in the absence of Zn in the oil additives. The results show how the phosphorus content in biodiesel fuel affects the functionality of the exhaust gas treatment systems and the importance of reducing the permitted content of phosphorus contained in the fuel. Reducing the phosphorus content in the fuel will conserve the functionality of the exhaust gas treatment systems during their operational life and thereby protect the environmental from emission pollutants. It also provides insight into the differences in the poisoning processes when the phosphorus deposited on the catalyst comes from biodiesel fuel and when it comes from the engine oil. Finally the results also illustrate the influence of different phosphorous forms contained in engine oil additives on the catalyst poisoning process. This information could be used for the development of new oil additive formulations.
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Van, Vuuren Christiaan Michael. "Modelling of internal combustion engine intake and exhaust processes." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52343.
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Thesis (MScEng)--University of Stellenbosch, 2001.ENGLISH ABSTRACT: This thesis is concerned with unsteady, one-dimensional flow, which closely mimics those found in the manifolds of internal combustion engines. The physical equations describing problems of this nature are presented and some of the important concepts introduced. These equations and concepts were verified by comparison to published results. The Method of Characteristics (MaC) for unsteady one-dimensional flow with friction and heat transfer was used to analyse the gas flow through the inlet and exhaust systems of an engine. The theoretical derivation of unsteady gas dynamic boundary conditions is presented and the integration with the unsteady pipe flow explained. A simulation flow model was developed to analyse the flow by using the Mae. Thisflow model was then incorporated into an engine simulation program, ESA,to simulate internal combustion engines and to predict the performance of a specific engine. A cam-profile model and an in-cylinder thermodynamic model are used to complete the ESAsoftware. Experimental work was done on a modified Nissan Z24/NA20 engine to evaluate the simulation model. The manifolds of the Nissan Z24/NA20 were modified to isolate one of the cylinders for a proper single cylinder model. More experimental work was done on a Volkswagen 1.6£ 8-valve and a 1.6£ 20-valve engine to obtain performance data on two inlet manifolds developed using the ESAsoftware. Performance data and pressure traces in the inlet manifold of the Nissan Z24/NA20 were recorded for comparison with the ESA software. Good correspondence was found between tested and modelled data and the differences varied between ±5% on engine performance data and pressure wave frequency predictions, and ± 10% on pressure pulse amplitudes.
AFRIKAANSE OPSOMMING: Hierdie tesis handeloor bestendige, eendimensionele vloei, wat die gasvloei in spruitstukke van binnebrandenjins naboots. Die nodige vergelykings wat hierdie tipe probleme beskryf asook van die belangrikste konsepte, word bespreek. Hierdie vergelykings en konsepte is met behulp van gepubliseerde data geverifieer. Die Metode van Karakteristieke (MVK) vir bestendige, eendimensionle vloei met wrywing en warmte oordrag, is gebruik om die gasvloei deur inlaat en uitlaat sisteme van 'n enjin te analiseer. Die teoretiese afleiding van bestendige gasdinamiese randvoorwaardes asook hul integrasie met die bestendige pypvloei, word verduidelik. 'n Simulasie vloeimodel is ontwikkelom die vloei met behulp van die metode van karakteristieke te analiseer. Hierdie vloeimodel is deel van 'n omvattende enjinsimulasie program, ESA. Dit word gebruik om binnebrandenjins te simuleer en enjinwerkverrigting te voorspel. 'n Nokprofielmodel en 'n termodinamiese ontbrandingsmodel word gebruik om die enjinsimulasie program af te rond. Eksperimentele toetse op 'n gemodifiseerde Nissan Z24/NA20 enjin is gebruik om die simulasie model te evalueer. Die spruitstukke van die Nissan Z24/NA20 is aangepas om een van die silinders te isoleer om so 'n geskikte enkelsilindermodel te skep. Verdere eksperimentele toetse is gedoen op Volkswagen 1.6£8- klep en 1.6£ 20-klep enjins. Werkverrigtingsdata is verkry op twee nuwe inlaatspruitstukke wat met behulp van die ESAsagteware ontwerp is. Werkverrigtingsdata en drukverdelingsdata in die inlaatspruitstuk van die Nissan Z24/NA20is aangeteken om te vergelyk met die resultate van die ESAsagteware. Goeie ooreenstemming is verkry tussen toets- en gemoduleerde data. Die verskille varieer tussen ±5% op enjin werkverrigtingsdata en drukpulsfrekwensie voorspellings, en ± 10%op drukpuls-amplitudes.
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Dreyer, A. J. "Aspects of manufacturing of stainless steel bellows." Thesis, 2012. http://hdl.handle.net/10210/6183.
Повний текст джерелаАнотація:
M.Ing.The purpose of this thesis was to gather experimental data of a stainless steel sleeve being formed into a convoluted tube. This convoluted tube, made from stainless steel ASTM 240 type 321 and with a wall thickness of 0,4mm, is the main part of an automotive exhaust bellow. The automotive exhaust bellow fits into a motor vehicle exhaust system. One of the functions of this bellow is to compensate for engine movement. The bellow is also used to damp the engine vibration to the vehicle chassis. Typical failures that occur during the production of a convoluted tube are identified. The data gathered are listed and the forming process, typical conditions and its effects discussed. The actual data and graphs are presented in the annexures at the end of this report. Plasticity theory for shells and cylinders is summarized in Annexure A and the solution of a related problem discussed. Experimental data were used to verify the result of a finite element model. The calculated values of the model compare well with the values of the experimental data. The model must still be developed further and the experimental data can be used to verify this developed model. Possible aspects, related to the forming and life-cycle prediction of an automotive exhaust bellow, that still need to be studied are identified and presented at the end of this report.
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Huang, Yiquan. "The effects of fuel volatility, structure, speed and load on HC emissions from piston wetting in direct injection spark ignition engines." 2001. http://hdl.handle.net/2152/10550.
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Leung, Emi. "Mechanistic Investigation of Novel Niobium-Based Materials as Enhanced Oxygen Storage Components and Innovative CO Oxidation Catalyst Support for Environmental Emission Control Systems." Thesis, 2016. https://doi.org/10.7916/D8N016FM.
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Nb-doped ZrO₂-CeO₂-Y₂O₃ solid solution (Nb-ZrCeYO) is studied as a possible oxygen storage component in three way automobile exhaust catalysts. It shows enhanced oxygen storage (OS) capacity with a higher extent of reduction at temperatures within the typical operating range of three-way catalyst compared with solid solutions without Nb. However, after several days of exposure to ambient air, the OS behavior of the Nb-doped samples shows significant degradation. Degradation is slowed for samples stored in evacuated environments (i.e. vacuum sealed glass tubes). NbOₓ segregation to the surface under oxidizing conditions is hypothesized as the cause of the degradation. This hypothesis is consistent with the temperature programmed reduction data. The addition of small amounts of Pt to the aged samples restores the enhanced initial performance advantages. It is postulated that electrons supplied by metallic Pt mimic reducing conditions, which are known to re-disperse surface NbOₓ species into the bulk solid solution, leading to stable, time-independent OS performance. However, the small advantage caused by Nb addition over the current technology is insignificant for the TWC application. Therefore, we focus on other environmental applications such as CO oxidation by Nb-containing catalysts with the specific objective of enhanced CO oxidation activity by formation of Cu¹⁺ species supported on Nb₂O₅.
The preparation of a Cu(1)Nb(2)Oₓ results in a solid solution crystallized in three different phases: CuO, Nb₂O₅, and CuNb₂O₆. The solid solution shows enhanced low temperature CO oxidation (<155˚C) activity compared to the reference CuO solid solution. Analysis by hydrogen-temperature programmed reduction (H2-TPR) indicates there are two different Cu species in the Nb-containing solid solution: highly dispersed Cu species and bulk CuO. The existence of an interaction between Cu and Nb ions is hypothesized for the enhanced low temperature CO oxidation activity by formation of Cu⁺¹. This hypothesis is consistent with XPS data, indicating the existence of more catalytically active Cu¹⁺/⁰ and Cu²⁺ species in the Nb₂O₅ sample, where the reference bulk CuO oxide shows only the less active Cu²⁺ species.
Impregnation of Cu-containing precursor salts on the Nb₂O₅ support leads to enhanced CO oxidation activity: The Cu supported Nb₂O₅ sample shows improved CO oxidation activity compared with the reference Cu supported on Al₂O₃. An isothermal aging test shows high stability of the Cu¹⁺ species on the Nb₂O₅ support at 155˚C for 20 hours in air. Studies of the optimization of the Cu supported Nb₂O₅ leads one to conclude that low surface coverage of NbOx on Al₂O₃ is the reason why these samples shows lower CO oxidation activity. The optimal amount of Cu species on the Nb₂O₅ support is 6%, where activity is similar to 1%Pt/Al₂O₃, the state of the art CO oxidation catalyst in industry, but a phase transformation of Nb₂O₅ occurring at 800˚C, leads to a loss in the enhanced CO activity. A gradual loss in surface area is observed for samples aged at higher temperatures, indicating support sintering as the main cause of the performance deterioration. Stable performance at low temperatures makes CuOₓ/Nb₂O₅ a potential candidate for stationary abatement applications, which operate at temperatures <400˚C. Advanced aging would be necessary to qualify it for specific applications. A kinetic model for CO oxidation of CuOₓ/Nb₂O₅ is also developed.
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Quigley, Christopher John 1962. "Refueling and evaporative emissions of volatile organic compounds from gasoline powered motor vehicles." Thesis, 2007. http://hdl.handle.net/2152/3642.
Повний текст джерелаАнотація:
The United States Environmental Protection Agency has estimated that over 111 million people reside in areas that exceed the National Ambient Air Quality Standards for ozone. One major source of the chemical precursors (nitrogen dioxides and volatile organic compounds (VOCs)) for ozone are motor vehicles. The overall goal of this research is to improve the knowledge base related to VOC refueling and evaporative emissions from motor vehicles. Refueling, running loss, hot soak, and diurnal loss total and speciated VOC emissions were investigated. A total of 12 uncontrolled refueling events were completed and involved the determination of volumetric flow rates of gasoline vapor during refueling, as well as total and speciated VOC concentrations. Total VOC emissions were compared with two commonly used algorithms. Speciated VOC vapor profiles were compared with two published gasoline vapor profiles and theoretical predictions based on knowledge of liquid composition and environmental conditions. An evaluation of refueling emissions impacts on ozone formation potentials using MIR was completed and results were compared against speciated emissions and MOBILE-based total VOC emissions estimates coupled with a default speciation profile. Refueling VOC emissions and resultant ozone formation potential may be underestimated in existing emission inventories, particularly during the summer ozone season, A model was developed to predict the speciation of VOCs associated with evaporative emissions from motor vehicles. Model-predicted speciation profiles were evaluated using SHED studies. Running loss, hot soak and diurnal emissions were included in each test. Total VOC emissions measured during each test were compared against MOBILE6 predicted emissions. An evaluation of evaporative emissions impacts on ozone formation potentials using MIR was completed, comparing measured and predicted emissions. The measured:predicted speciation results ranged between 0.93 and 1.11 and had an average value of 1.02. For the conditions tested, MOBILE6 underestimated evaporative emissions in 20 of 24 comparisons. MOBILE6-based ozone formation potentials may be underestimated.
Книги з теми "Automobiles Motors Exhaust systems Noise"
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Munjal, M. L. Acoustics of ducts and mufflers with application to exhaust and ventilation system design. New York: Wiley, 1987.
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How to build & modify intake & exhaust systems. Osceola, WI: Motorbooks International, 1994.
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Automotive cooling, exhaust, fuel, and lubricating systems. Reston, Va: Reston Pub. Co., 1985.
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Ōsaka ni okeru jidōsha kōgai taisaku no ayumi. [Osaka]: Ōsaka Jidōsha Kōgai Taisaku Suishin Kaigi, 2003.
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E, Duffy James. Auto fuel and emission control systems: Technology. South Holland, Ill: Goodheart-Willcox, 1992.
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Policy, India Expert Committee on Auto Fuel. Report of the Expert Committee on Auto Fuel Policy: Executive summary. [New Delhi]: Govt. of India, 2002.
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Engine emissions measurement handbook: HORIBA automotive test systems. Warrendale, Pennsylvania, USA: SAE International, 2014.
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Seminário de Emissões e Combustíveis (1992 Instituto de Engenharia, São Paulo, Brazil). Seminário de Emissões e Combustíveis: 1 e 2 de setembro de 1992. [São Paulo, Brazil]: Publicações AEA, 1992.
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International Conference on 21st Century Emissions Technology . International Conference on 21st Century Emissions Technology. Bury St Edmunds: Professional Engineering for IMechE, 2001.
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Automotive Industry in Expanding Countries Conference (1991 Buenos Aires, Argentina). Automotive Industry in Expanding Countries Conference proceedings. Warrendale, PA: Society of Automotive Engineers, 1991.
Знайти повний текст джерелаТези доповідей конференцій з теми "Automobiles Motors Exhaust systems Noise"
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Czechowicz, Alexander, Fabian Hoffmann, Sven Langbein, Peter Dültgen, and Romeo Wieczorek. "On the Development of an SMA Based Rear Mirror Folding Actuator." In ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9119.
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Nowadays electric motors are used for various applications in the automotive industry which affects the automobiles’ mass significantly. Small and medium sized electromotors are mainly used for comfort applications like locking systems or mirror folding drives. On the other hand, electromotor drives use often a reduction of a high speed rotation to a slow and powerful movement by the usage of gears. Due to the multistage gear ratio principle, such drives emit a noise level up which can be an inferiority attribute of an automotive system. Nevertheless, comfort applications are mainly driven by electromotor actuators in automobiles. Figure 1 shows a cut through a schematic side mirror of a car with two major electromotor drives comparable to the state of the art. The motor for mirror folding consists mainly of the complex gear box which has to fulfill a mirror movement of more than 65° in less than 5 seconds. To move the mirror with the motor has to have enough mechanical power to overcome this force and to move the mirror with a torque of more than 5 Nm.
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Nguyen, The, Mohammad Elahinia, and Constantin Ciocanel. "A Magnetorheological Mount for Hydraulic Hybrid Vehicles." In ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1362.
Повний текст джерелаАнотація:
Advanced vehicular technologies have been increasingly popular since they improve fuel economy. Automobiles with variable cylinder management are capable of turning on/off the cylinders in order to optimize the fuel consumption. Hybrid vehicles such as hybrid electric vehicles (HEVs) or hydraulic hybrid vehicles (HHVs) allow the engines to operate in the most efficient region. Besides, the hybrid technology includes capturing the braking energy, otherwise wasted as heat, to aid the acceleration. However, the enhancement in fuel efficiency comes with unbalance, shock and wider range of frequency vibration. Noise and vibration is actually one of the main obstacles in commercializing the HHV technology. This study is to design a vibration isolator to work for HHVs effectively and economically. The vibration profile of HHVs is proven to include both shock load at the switches of power sources and wide frequency range of vibration. That the HHV’s engine is turned on/off frequently and the hydraulic pumps/motors operate between 0 and 2000RPM, corresponding to 0–300Hz, poses difficult challenges for the isolation system. Rubber mounts are cheap, but only good for static load support and suitable for low power engine. Passive hydraulic mounts are only effective for conventional engines with unvarying working schedules. On the other hand, the active mounts are responsive for any condition, but too costly for commercial vehicles. Semi-active mounts with magnetorheological fluid (MRF) have been researched and recognized as a highly potential solution for hydraulic hybrid vehicles. The semi-active MRF mount is constructed very similar to a conventional hydraulic mount. However, the working fluid is an MRF which can quickly change its characteristics when the magnetic field is present. The main features of the MRF mount include multiple controllable MR valves, utilizing the flow (valve) mode, to connect the top and bottom fluid chambers. In addition, the mount is also capable of employing the fluid in squeeze mode. The structure of the MRF mount allows the stiffness and damping to be controlled in real time. The controllability makes the mount tunable to particularly fit the requirements of the HHVs. In this study, a mathematical model was constructed to predict the performance of the mount. The parameters were tuned so that the mount is effective within the whole operating frequency range of the HHV’s vibration.
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Meierjurgen, Kenneth, Brian Harries, Marc Compere, and Yan Tang. "Sensorless Selective Catalytic Reduction Using Artificial Neural Networks for Emissions Prediction With Fuzzy Logic Control." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65301.
Повний текст джерелаАнотація:
The transportation industry is a major contributor to the increase of greenhouse gasses present in the atmosphere. With the number of automobiles increasing every year, the U.S. government has implemented several regulations to reduce the environmental impact of the transportation industry. The most recent regulations increase the Corporate Average Fuel Economy (CAFÉ) to over 50mpg by 2025. These increased fuel economy standards will save consumers money, reduce dependence on foreign oil and cut GHG emissions in half (1). In order to comply with these regulations and reduce GHG emissions, automakers are improving powertrain efficiency and diversifying their fuel sources. One way automakers are improving fleet fuel economy is by offering more efficient Compression Iginition (CI) engines. Compression ignition engines can have a 10% improvement in peak efficiency over a Spark Ignition (SI) Engine. Although CI engines have higher efficiencies, they also have higher Nitrous Oxide (NOx) emissions. One of the most effective methods for reducing NOx emissions is a Selective Catalytic Reduction (SCR) system. Current methods for reducing NOx emissions using SCR rely on two NOx sensors for close loop control. These sensors add substantial costs to the production exhaust after treatment systems. This paper presents an intelligent control technique to achieve accurate prediction of NOx emissions and closed loop control without the use of expensive on board sensors. Simulation models were created to validate two artificial neural networks that aim to replace the upstream and downstream NOx sensors. The upstream neural network was trained using dynamometer data from a General Motors 1.3l turbo diesel engine. This neural network represented NOx emissions as a function of engine speed and throttle position. The downstream ANN was created using a nonlinear statespace plant model that simulates the catalyst NOx and nh3 reaction. To control the nh3 injection into the catalyst, a Fuzzy Logic Controller (FLC) was implemented. The FLC controller had two inputs: the error function calculated from the output NOx and a predetermined NOx target as well as the predicted surface coverage from the nh3 reaction. The results from steady state and drive cycle simulations are shown. The work presented in this paper serves as a proof of concept for the sensorless SCR system that was developed as part of ERAU’s entry in EcoCAR2: Plugging Into the Future. The simulations were conducted as part of year 1 of the EcoCAR2 competition and will be further developed during years 2 and 3 on ERAU’s Series Plug-in Hybrid Electric Vehicle.