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Samenvatting Internal Combustion Engine Fundamentals

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Covering the basics through advanced operation of spark-ignition and diesel engines. Written by one of the most recognized and highly regarded names in internal combustion engines this trusted educational resource and professional reference covers the key physical and chemical processes that govern internal combustion engine operation and design. Internal Combustion Engine Fundamentals, Second Edition, has been thoroughly revised to cover recent advances, including performance enhancement, efficiency improvements, and emission reduction technologies. Highly illustrated and cross referenced, the book includes discussions of these engines' environmental impacts and requirements. You will get complete explanations of spark-ignition and compression-ignition (diesel) engine operating characteristics as well as of engine flow and combustion phenomena and fuel requirements. Coverage includes: - Engine types and their operation - Engine design and operating parameters - Thermochemistry of fuel-air mixtures - Properties of working fluids - Ideal models of engine cycles - Gas exchange processes - Mixture preparation in spark-ignition engines - Charge motion within the cylinder - Combustion in spark-ignition engines - Combustion in compression-ignition engines - Pollutant formation and control - Engine heat transfer - Engine friction and lubrication - Modeling real engine flow and combustion processes - Engine operating characteristics

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Hoofdstuk 1 t/m 15
Uploaded on
February 9, 2022
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Written in
2021/2022
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3. LAWAAI
p
3.1. Basisbegrippen dB = 20log
p ref
trillingen lichaam → drukgolven → oor
1. gehoordrempel en pijngrens ver uit mekaar
ppijn ≈ pdrempel ⋅ 107 ⇒ logaritmische schaal
2. als referentie p = 2 ⋅ 10-4 μbar
(kleinst waarneembaar geluidsniveau)
3. gevoeligheid gehoor verandert met frequentie
→ daarom ponderatiecurven
in voertuigtechniek ponderatiecurve A (in dB A) ;
± gelijklopend met gehoorgrens
ponderatie in meetapparatuur gesimuleerd door filters

3.2. Motorlawaai
│-motorlawaai
voertuiglawaai : │- banden
│- aërodynamisch
│- remmen, deuren, koetswerk, toebehoren
hier alleen motorlawaai
1. mechanisch : stoten motoronderdelen tegen elkaar
2. verbrandingslawaai
3. in- en uitlaatlawaai
4. ventilatoren
1. mechanisch lawaai
- zuiger tegen cilinderwand
- injectie bij diesels (naald + ontlastingventiel)
- (andere) bronnen lawaai beperken door:
• kleinere lagerspeling
• flexibele zuigermantels
• hydraulische kleppenstoters
• schuine vertandingen
• nauwkeurig afgewerkte tandwielen
lawaai slide 1.
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