Mach Anzeiger - traduction vers allemand
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Mach Anzeiger - traduction vers allemand

PRESSURE WAVE
Mach angle; Mach line; Mach cone; Mach stem; Mach front
  • A sonic boom produced by an aircraft moving at M=2.92, calculated from the cone angle of 20 degrees. Observers hear nothing until the shock wave, on the edges of the cone, crosses their location.

Mach Anzeiger      
Mach meter, device measuring speeds above the speed of sound
mach number         
  • The speed of sound (blue) depends only on the temperature variation at altitude (red) and can be calculated from it since isolated density and pressure effects on the speed of sound cancel each other. The speed of sound increases with height in two regions of the stratosphere and thermosphere, due to heating effects in these regions.
  • 300px
  • 300px
RATIO OF SPEED OF OBJECT MOVING THROUGH FLUID AND SPEED OF SOUND
Mach (speed); Mach Number; Mach speed; Mach 5 (speed)
n. Machzahl, Zahl die Geschwindigkeit eines Objekts im Verhältnis zur Schallgeschwindigkeit angebend
Ernst Mach         
  • Bust of Mach in the [[Rathauspark]] (City Hall Park) in [[Vienna]], Austria
  • Spinning chair devised by Mach to investigate the experience of motion
  • Ernst Mach in 1905
  • ''La mécanique'', 1904
  • Exaggerated contrast between edges of the slightly differing shades of gray, appears as soon as they touch
  • p=65}}
AUSTRIAN PHYSICIST AND UNIVERSITY EDUCATOR (1838–1916)
Mach, Ernst; E. Mach; Machism; Ernest Mach; Machian physics; Empirio-criticism; The Analysis of Sensations; Ernst Waldfried Josef Wenzel Mach; Empiriocriticism
n. Ernst Mach (1838-1916), österreichischer Physiker und Philosoph der die Mach-Zahl als erster vorstellte

Définition

MACH
Multilayer ACtuator Head

Wikipédia

Mach wave

In fluid dynamics, a Mach wave is a pressure wave traveling with the speed of sound caused by a slight change of pressure added to a compressible flow. These weak waves can combine in supersonic flow to become a shock wave if sufficient Mach waves are present at any location. Such a shock wave is called a Mach stem or Mach front. Thus, it is possible to have shockless compression or expansion in a supersonic flow by having the production of Mach waves sufficiently spaced (cf. isentropic compression in supersonic flows). A Mach wave is the weak limit of an oblique shock wave where time averages of flow quantities don't change (a normal shock is the other limit). If the size of the object moving at the speed of sound is near 0, then this domain of influence of the wave is called a Mach cone.