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Gereedschap

Bicycling Science

Gegevens

Volledige titel

Bicycling Science

Auteur

David Gordon Wilson
Jim Papadopoulos

Categorie

Boeken over fietstechniek in het algemeen

Uitgever

MIT Press

Plaats

Cambridge, Mass. [etc.]

Bladzijden

480

Druk

3de

Jaar

2004

ISBN

0262731541

Omschrijving

De derde editie van dit standaardwerk verscheen in 2004, meer dan twintig jaar na de tweede uitgave uit 1982 en is bijna 100 bladzijden in omvang toegenomen. Co-auteur was niet langer Frank Whitt (inmiddels overleden) maar oud MIT-promovendus en -medewerker Jim Papadopoulos. Hij is vooral verantwoordelijk voor hoofdstuk 8 over 'steering and balancing', maar heeft ook elders bijdragen geleverd. Het boek besteedt veel meer aandacht dan bijvoorbeeld Burrows Bicycle design aan alternatieve fietsontwerpen, ligfietsen en HPVs, zoals ook al uit de drie deeltitels blijkt: I Human Power (hfdst. 1-3), II Some bicyle physics (hfdst. 4-10), III Human-Powered vehicles and machines (hfdst. 11-12). Volgens de tekst van het omslag zijn de hoofdstukken 2, 5, 11 en 12 `completely new', terwijl de hoofdstukken 3,4, 6, 7, 8, 9 en 10 meer of minder ge-update zijn. Ook hoofdstuk 1bevat veel verwijzingen naar onderzoek en literatuur van de laatste 10 jaar. Bovendien bevat deze editie veel nieuwe illustraties, met name van allerlei UHPVs. Elk hoofdstuk bevat uitgebreide literatuurrerefenties.

Verkrijgbaarheid

23 $ (Pb)

Inhoudsopgave

1. A short history of bicycling (early history, the first bicycle, the second step: pedalling propulsion, the high-hweeler, tircycles and quadricycles, the third step: the arrival of the modern safety bicycle, waxing and waning enthusiasm, all-terrain bicycles, recumbents, bicycle technology)
2. Human Power generation (measuring human power output, describing pedalling performance quantitatively, critical power: curve fitting to power-duration pedalling data, anaerobic power: the Wingate test, physiology of high-power pedalling, overview of how muscles work, the six muscle fuels, two fast-acting fuels, three longer-duration carbohydrate fuels, fat, the fuel for very-long-duration effort, exercising to reduce body fat, types of muscle fibers, fiber recruitment, high-power aerobic metabolism: lactate threshold and glycogen depletion, high-power aerobic metabolism: lactate accumulation and fast-twitch-fiber population, oxygen uptake, recovery from exertion, energetics in pedalling, personal energy requirements, the effects of pedalling position, animals are fuel cells, breathing, pedalling forces, average thrust, detailled pedal-force data, effects of pedalling motion, body position, amd rpm, pedalling and rwoing motions, pedalling combined with hand cranking, upright and recumbent pedalling, backward pedalling, powercranks and the active involvement of the lifting muscles, effect of saddle height, effect of crank length, nonround chainwheels, lever or linear drives, noncircular cranking, some other forms of power output, measurements made during actual bicycling)
3. Thermal effects on power production (how bicyclists keep cool) (local end mean heat transfer, heat-transfer data and deductions, minimum air speed, bicycling in cold and hot conditions, physiology of body-temperature regulation, heat-transfer compariosn of swimming, running and bicycling)
4. Power and speed (air resistance, speed achieved at a given power, slope resistance, rolling resistance, rolling resistance from bump losses, minimizing bump losses, detrmining bump losses, steady-speed power equation, rules of thumb, acceleration, measuremnt of on-road power, on-road determination of aerodynamic and rolling drag, comparing with trials on other environmental conditions, on-road determination of rider power curve, dicussion of insights regarding power and drag, some prescriptions for increasing speed at medium- or high-power levels (>150 W), championship racing performances, the relationship between power and speed, energy consumption as a function of distance, power needed for land locomation, animals or wheels, bicycles versus other vehicles, human versus animal muscle power, bicycling versus other human powered locomotion (roller skating, walking, running), effects of gradients and headwinds, should one walk or pedal up hills, specfic energy versus specific power of various power sources)
5. Bicycle aerodynamics (drag coeficient, different definitions of area and of drag coefficient, drag, coefficient of drag vesrus Reynolds number for various bodies, reducing the aerodynamic drag of vehicles, prone, supine and recumbent positions and bikes, partial and fulle fairings, practical fairings, boundary-layer suction, the effect of surface roughness on streamlined bodies, wind loads from passings vehicles, drafting and sice-by-side bicycling, behavior of faired bicycls in crosswinds)
6. Rolling: tires and bearings (some historical notes, rolling resistance, bicycle wheels, comparing the friction of tires and bearings, bearing friction, rolling resistance: theory and correlations, tilted ground force due to material inelasticity, form of resistance equation, examples of correlations for different conditions (firm wheel and firm ground, firm wheel and soft ground, soft wheel and firm ground), bicycle tire diameter and road roughness, increase of speed due to a reduction in Cr, tire construction to minimize energy loss)
7. Braking
8. Steering and balancing
9. Mechanics and mechanisms: power transmision
10. Materials and stresses
11. Unusual human-powered machines
12. Human-powered vehicles in the future
Appendix [mainly scientific symbols and notations]
Timeline [on HPVs, 1787-1932]
Index

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