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

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coefficient of velocity ζ*. These correlations form the basis of the regression model for the coefficient of velocity. Initial regression calculations reveal that the influence of the rotation speed n can be well approximated with a power function. The best alternative for the influence of the inclination β as proven to be a model from two linear influences with a cusp at β = 40°. Issue 04 | 2010 Pic. 6: Influence on the coefficient of velocity TRANSFER OF TECHNOLOGY In order to simplify the model, it is sufficiently accurate to assume a linear correlation for the influence of the screw diameter. The regression model has the following form: (17) www.advanced-mining.com 52
The values listed in table 5 are values for the regression coefficient, depending on the screw inclination. The respective calculated standard deviation of the coefficient is indicated. A standard deviation that is small in relation to the coefficient is a sign for a significant influence of the variable of the coefficient. It can be seen that the standard deviation for all coefficients lies at a maximum of 3% of the coefficient value, thus in all reviewed variables one can assume a significant influence. To finally assess the quality of the regression model, the values calculated through the regression model for the coefficient of velocity ζ is compared to the determined values ζ* and graphically presented. Picture 7 shows the corresponding estimated values ζ over the determined values ζ* The model is the better, the closer the points are to the bisecting line. It can be seen that there a re no major outliers and the data points of the estimated values of the coefficient of velocity ζ it the bisecting line. In terms of numbers the quality of the model can also be assessed with the help of the radical of the mean square error. MQF = Issue 04 | 2010 1 i i ∑ k= 1 * 2 ( ζ − ζ ) k k (18) The radical of mean square error in the current model is √(MQF) = 0,0111. Even in the smallest determined coefficients of velocity ζ* this corresponds to an average deviation of smaller than 3% and proves sufficient accuracy of the calculated regression model. In order to assess, where deviations of the model lie, picture 8 shows the determined and estimated values of the coefficient of velocity in the various categories. For the sake of limiting complexity, the screw diameter parameter is not itemized, since it has the least influence and the diagrams offer very similar results. It can be seen that in almost all fields there is a good concurrence between the coefficient TRANSFER OF TECHNOLOGY determined data points and the calculated model (curve). It is only in border areas that there are minor deviations. Thus the obtained regression model is suitable for calculation of the coefficient of velocity. The achievable volume flow I V of an inclined screw conveyor can therefore simply and reliably be calculated through the equations (6) and (17). Pic. 7: Model fitting for the coefficient of velocity β =30° β = 40° β > 40° Standard deviation Table 5: The regression coefficient of velocity coefficient Standard deviation coefficient Standard deviation a -0,287003 0,001893 -0,861013 0,005680 -1,146694 0,003376 b -0,795297 0,018035 -0,795313 0,018035 -0,793336 0,008084 c 0,068029 0,000770 0,204090 0,002311 0,272243 0,001381 d 0,023858 0,000757 0,071570 0,002271 0,095512 0,001356 e - - - - -0,000987 0,000016 f 0,958562 0,001882 0,875682 0,005645 0,879204 0,003576 www.advanced-mining.com 53
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 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 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: The calculation method delivers the
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 and 90: Issue 04 | 2010 Fig. 24: Comparison
Page 91 and 92: Fig. 32: Low-noise fan Issue 04 | 2
Page 93 and 94: • Sound protection by terrain top
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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while tumbling. In a Vertimill® th
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The Develeopment of Vertimill US$0.
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Issue 04 | 2010 NEWS & REPORTS THE
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Moreover, the impact of the crusher
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CONTITECH Issue 04 | 2010 NEWS & RE
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partners up to tailor made special
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Three heavy chain dredgers, a big w
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across an area of 125,000 square me
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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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Rohstoffversorgungstechnik Rohstoff
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PUBLISHING COMPANY AMS Online GmbH
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