A new face drilling rig for narrow tunnels and ... - Advanced Mining

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Fig. 3: Wave motion of air particles The particles reciprocate within the sound field. In still air, the particle motion takes place round a neutral position, as already said before. In moving air, the alternating speed caused by the sound field is superposed on the average flow velocity. The phase velocity (speed of sound c) is to clearly set apart from the particle velocity (sound particle velocity v). The sound velocity (= speed of sound) is dependent on the carrier medium. Sound particle velocity v In a plane sound wave, the link between sound pressure and sound particle velocity is, as follows: ⋅ c ⋅v p = ρ ⋅c ⋅v N kg m m N kg m m { = ⋅ ⋅ } { = ⋅ ⋅ } Issue 04 | 2010 m² m³ s s m² m³ s s TRANSFER OF TECHNOLOGY kg kg = 1, 2 luft 1, 2 p = Schalldruck[ Np = / mSchalldruc ²] k[ N / m²] m³ m³ ρ = Dichte[ kg / mρ³] = Dichte[ kg / m³] m c = Schal lg eschwindig c = Schal keit[ lgm eschwindig / s] keit[ m / s] 344 s v = Schallschnellev [ m= Schallschn / s] elle[ m / s] = ρ When reflecting on vibrations and waves, harmonic motions are of particular importance. Harmonic motions have a sinusoidal variation in time. All vibrations can be m decomposed in harmonic motions by Fourier analysis. To a cluft = 344 sinusoidal variation of the field size applies: s ~ 1 p = ⋅ pmax The product resulting from density and speed of sound 2 is defined as characteristic acoustic impedance. ρ ρ luft luft ⋅ ⋅ c Luft kg = 1, 2 ⋅344 m³ kg Ns ⇒ ⇒ m² ⋅ s m³ c Luft Effective value m s = 413 kg m² ⋅ s For numerical value data of the field sizes sound pressure and sound particle velocity, there is used the effective value, unless otherwise stated. The effective value of a field size is obtained by squaring the time function, by integrating the latter for a long time, by taking the time mean then, and by extracting the square root at the end. ~ 1 p = ∫ p²( t) dt T Sound intensity The sound intensity I describes the sound power (energy), passing per time unit a surface that is standing at right angles to radiation. The sound intensity is a vector quantity. P I = p ⋅ v = ⋅ n A www.advanced-mining.com 70
Table 1: Speed of sound of different carrier media Field size, energy size Field sizes are in the physical sense values that belong to each point in a room. This classification is clear and constant. In contrast to the field sizes, energy sizes do not belong to points in a room, but they apply to the whole room. Issue 04 | 2010 Schalldruck Schallschnelle Schallauslenkung el. Spannung el. Stromstärke el. Widerstand TRANSFER OF TECHNOLOGY Free field The term free field means a sound field in which all points in a room are only stimulated into vibrations by the sound energy starting at the source. In the free field, there are no reflections or superpositions of sources of sound. Table 2: Field sizes and energy sizes Feldgröße Energiegröße Schallintensität Schallenergiedichte Schalleistung el. Leistung mech. Leistung Rez. Abstandsgesetz 1/r Rez. Quadratgesetz 1/r² www.advanced-mining.com 71
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EDUCATION NEWS & REPORTS alljig ®
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Pic. 1: Multi-phase system of the s
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HYDROMETER ANALYSIS The hydrometer
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EDUCATION Pic. 7: Interpretation of
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Hereby the dry solids md are determ
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Issue 04 | 2010 TRANSFER OF TECHNOL
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Basics of Market Review and Require
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• Layout an Operation Time: Based
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Page 31 and 32: The future All work was successfull
Page 33 and 34: Pic. 2: Schematic tribological syst
Page 35 and 36: Experimental Study In highly abrasi
Page 37 and 38: Results The results of the test acc
Page 39 and 40: Abtrag in mm³ 18 16 14 12 10 8 6 4
Page 41 and 42: Bibliography [1] Uetz, H.: Abrasion
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Page 61 and 62: Terms of Trade The three biggest pr
Page 63 and 64: The single wattmeter method (single
Page 65 and 66: Results of the measurement Fig. 12
Page 67 and 68: Bibliography [1] INTERNATIONAL ENER
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Page 87 and 88: Table 11: Slewing crane - Sum sound
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Page 95 and 96: Issue 04 | 2010 Zielitz potash mine
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Page 99 and 100: a Hütte type HBR 201 universal dri
Page 101 and 102: Introduction The Vertimill® is a u
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Page 105 and 106: The Develeopment of Vertimill US$0.
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CONTITECH Issue 04 | 2010 NEWS & RE
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haver & BoeCker w i r e weaving a n
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The consistently positive reactions
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Issue 04 | 2010 NEWS & REPORTS Spea
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partners up to tailor made special
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Kiesel: Hitachi wheel loader ZW550
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Three heavy chain dredgers, a big w
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concrete crusher, demolition and so
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across an area of 125,000 square me
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Following the live demonstrations,
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Also new in the 390D L‘s implemen
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Specification Comparison 390d L / 3
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The tunnel contractor consortium Co
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2011 THE AMS-EVENT CALENDER Issue 0
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Issue 04 | 2010 EVENTS STEINExPO 20
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Issue 04 | 2010 EVENTS FOR MORE INF
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Rohstoffversorgungstechnik Rohstoff
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