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5.6 Alternate Manual Waveform Calculations <br />Thz followin_ sec[ions discuss manual waveform analysis techniques. These have been includzd <br />for reference purposes only. They do not represent the calculation techniques employed by thz <br />BlastMate III. <br />Graphical methods for calculating area and slope depend on the shape of the waveform being <br />analyzed. A complete discussion o(thz procedures is beyond the scope of this manual. Two useful <br />reference [eats are G. A. BOLLIGER. BLAST L'/BR.aT/O~V A~Y,tLY'S/S, Southern Illinois <br />University Press and CHARLES H. DOWDING, BLAST !'IBRATIOA' d10NlTORI:\'G A~VD <br />COA'TROL, Prentice-Hall Inc. <br />In each of thz subsequent examples some formulae appear with no attempt at derivation. The <br />follovvine definitions apply: <br />A = amplitudz in inches/second measured from the zero line <br />Am = amplitude measured in millimetres/second <br />T = period in seconds <br />Y = absolute change in amplitude over time measured in inches/second <br />Ym = absolute chance in amplitude over time measured in millimetres/second <br />5.6.1 Sinusoidal Waveforms <br />The motion is essentially sinusoidal with eradual ampli[ude and frequency changes. <br />a. Calculating Displacement: <br />T <br />-xA <br />Maximum Displacemen[ (in.) _ ~n <br />T <br />Maximum Displacement (mm) = 2~ x A <br />b. Calculating Acceleration: <br />?n <br />Maximum Acceleration (in./s=) = T X A <br />Maximum Acceleration (mm/s=) = T x A,~ <br />BlastMace III Operator Manual <br />5-11 <br />• <br />• <br /> <br />