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

More documents

Recommendations

Info

Sound proofing by insulation Apart from the possibilities to take directly measures at the source of sound, already described in part before, there is a further proven medium, the sound insulation. Here, the sources of sound, like drive units, get completely covered by means of sound insulation elements. When planning such sound insulations or claddings, care has to be taken that the sound insulation factors given by the manufacturers for the sound insulation elements, or in the sound insulation cladding itself, will not be reached. The insulation property of a wall with respect to the sound protection is expressed by the so-called sound insulation factor R. The sound insulation factor R is the logarithmic ratio that the sound power that impinges on a wall bears to the sound power that passes a wall. The sound insulation factor is dependent on the frequency and the sound wave angle, what cannot directly be seen from the defining equation. If the sound insulation factor of a sound insulation element is plotted over the frequency, there will be formed the so-called sound insulation curve. It is a function of the rigidity, the resonant frequency, the mass and the coincident frequency. In the sound insulation curve there are three different ranges. Within the range of resonant frequency and coincident frequency, there can be clearly seen invasions of the sound insulation factor. The two ranges are separated from each other by a linear range to which the mass law does apply. The mass law expresses that a doubling of the frequency or a doubling of the basis weight of the wall improves the sound insulation by 6dB. The notation with which we are familiar now enables the mass law to be formulated, as follows: If the incident sound wave shows the same or a similar frequency as the natural frequency of the wall, the wall will be excited to stronger vibrations. In case of the coincidence, the incident sound wave, or the projection of the wave, has the same wave length as the bending wave that is produced in the wall. So, the bending waves in the wall become excited to a higher degree. If the sound wave strikes a wall below an angle δ, Issue 04 | 2010 TRANSFER OF TECHNOLOGY and if the wave length of the incident sound wave λ 0 is to the bending wave length of the wall λ B as the sine of the incident angle, it will come to coincidence. The wall becomes acoustically transparent within this area. That is the effect called coincidence influx. When making use of sound insulation claddings, the area of the resonance influx is dependent on the construction and the area of the coincidence influx on the material. Fig. 27: Coincidence effect Fig. 26: Sound insulation curve When planning sound insulation claddings, the thermal dissipation from the housing into the environment, while using sound absorbers, has to be taken into account. Furthermore, there is to be drawn up a thermal balance, considering the environmental and climatic conditions. www.advanced-mining.com 90
Fig. 32: Low-noise fan Issue 04 | 2010 Fig. 31: Rope passage with sound absorber Fig. 30: Covering of drive unit by using perforated sheet metal TRANSFER OF TECHNOLOGY Fig. 28: Cladding / Drive unit with sound absorberr Fig. 29: Coupling hood • Openings are to be closed or to be equipped with sound absorber, if possible for technical reasons • Closed rooms are to be equipped with sound absorbers and low-noise fans • Noise sources and vibrators are to be mounted on flexible supports, or the impedance towards the steel structure is to be increased by large masses www.advanced-mining.com 91
Page 1 and 2:
www.advanced-mining.com 04 2010 ADV
Page 3 and 4:
EDUCATION NEWS & REPORTS alljig ®
Page 5 and 6:
Pic. 1: Multi-phase system of the s
Page 7 and 8:
HYDROMETER ANALYSIS The hydrometer
Page 9 and 10:
EDUCATION Pic. 7: Interpretation of
Page 11 and 12:
Hereby the dry solids md are determ
Page 13 and 14:
Issue 04 | 2010 TRANSFER OF TECHNOL
Page 15 and 16:
Basics of Market Review and Require
Page 17 and 18:
• Layout an Operation Time: Based
Page 19 and 20:
Pic. 2: Technical basic parameters
Page 21 and 22:
Issue 04 | 2010 Pic. 5: 3 D visuali
Page 23 and 24:
Pic. 6: Treatment diagram of proces
Page 25 and 26:
[5] Kirschbaum, Martin (1991):Grund
Page 27 and 28:
Issue 04 | 2010 TRANSFER OF TECHNOL
Page 29 and 30:
Going underground Experts have been
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
Page 43 and 44: Issue 04 | 2010 TRANSFER OF TECHNOL
Page 45 and 46: the classical mechanics through a f
Page 47 and 48: Hereby ζ is the coefficient of vel
Page 49 and 50: Characteristic data like active cur
Page 51 and 52: The calculation method delivers the
Page 53 and 54: The values listed in table 5 are va
Page 55 and 56: Like in the coefficient of velocity
Page 57 and 58: Prof. Dr.-Ing. Dipl.-Wi.-Ing. W. A.
Page 59 and 60: Global ressources, reserves and pro
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
Page 69 and 70: Sound power P Sound power P is the
Page 71 and 72: Table 1: Speed of sound of differen
Page 73 and 74: Definition of the most important so
Page 75 and 76: Now, it is enabled the sound power
Page 77 and 78: Table 6: Example of admissible soun
Page 79 and 80: Table 7: Example of admissible soun
Page 81 and 82: In the sound spectrum of constructi
Page 83 and 84: Table 8: Time change of the third-o
Page 85 and 86: • Surfaces not directly into cont
Page 87 and 88: Table 11: Slewing crane - Sum sound
Page 89: Issue 04 | 2010 Fig. 24: Comparison
Page 93 and 94: • Sound protection by terrain top
Page 95 and 96: Issue 04 | 2010 Zielitz potash mine
Page 97 and 98: HBR 201 electrohydraulic drilling m
Page 99 and 100: a Hütte type HBR 201 universal dri
Page 101 and 102: Introduction The Vertimill® is a u
Page 103 and 104: while tumbling. In a Vertimill® th
Page 105 and 106: The Develeopment of Vertimill US$0.
Page 107 and 108: Issue 04 | 2010 NEWS & REPORTS THE
Page 109 and 110: Moreover, the impact of the crusher
Page 111 and 112: at l a s Co p C o Un d e r g ro U n
Page 113 and 114: at l a s Co p C o Un d e r g ro U n
Page 115 and 116: BaCkers Ma s C h i n e n B a U gM B
Page 117 and 118: al lMineral aUfBereitUngsteChnik gM
Page 119 and 120: al lMineral aUfBereitUngsteChnik gM
Page 121 and 122: CONTITECH Issue 04 | 2010 NEWS & RE
Page 123 and 124: not limited by the size of gearbox
Page 125 and 126: haver & BoeCker w i r e weaving a n
Page 127 and 128: The consistently positive reactions
Page 129 and 130: Issue 04 | 2010 NEWS & REPORTS Spea
Page 131 and 132: partners up to tailor made special
Page 133 and 134: Kiesel: Hitachi wheel loader ZW550
Page 135 and 136: Three heavy chain dredgers, a big w
Page 137 and 138: concrete crusher, demolition and so
Page 139 and 140: across an area of 125,000 square me
Page 141 and 142:
Following the live demonstrations,
Page 143 and 144:
Also new in the 390D L‘s implemen
Page 145 and 146:
Specification Comparison 390d L / 3
Page 147 and 148:
The tunnel contractor consortium Co
Page 149 and 150:
2011 THE AMS-EVENT CALENDER Issue 0
Page 151 and 152:
Issue 04 | 2010 EVENTS STEINExPO 20
Page 153 and 154:
Issue 04 | 2010 EVENTS FOR MORE INF
Page 155 and 156:
Rohstoffversorgungstechnik Rohstoff
Page 157 and 158:
Issue 04 | 2010 FAchtAgUng Kies, Sa
Page 159:
PUBLISHING COMPANY AMS Online GmbH
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?