pltw inc. engineering formulas y footing a = area of foot structural design qnet steel beam design: moment m n = f y z x m a = allowable bending moment m n = nominal moment strength ω b = 1.67 = factor of safety for bending moment f y = yield stress z x = plastic section modulus about neutral axis spread footing design = q allowable - p footing q
books for practical mechanical engineering. for anyone interested in the practical applications of mechanical engineering here is a list of terrific books reviewed by peter glaskowsky.
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the purpose of marks’ calculations for machine design is to uncover the mystery behind the principles and particularly the formulas used in machine design. all too often a formula found in the best of references is presented without the necessary background for the designer to understand how it was developed. this can be frustrating because of
mechanics and machine design equations and calculators design of load carrying shaft with one pulley & supported by two bearings flywheel effect or polar moment of inertia lifting boom davits application and design equations large and small diameter lifting pulley / drums two lifting lifting pulley's mechanical advantage multiple pulley's lifting mechanical advantage mechanical
machine efficiency machine efficiency can be measured in terms of energy efficiency or the productive results of equipment. the latter approach uses the value of outputs and cost of inputs. in a month a drilling machine takes inputs such as labor electricity materials and depreciation on the machine itself that cost 50000 dollars.
however as a screening test a negative result is very good at reassuring that a patient does not have the disorder (npv = 99.5%) and at this initial screen correctly identifies 91% of those who do not have cancer (the specificity). estimation of errors in quoted sensitivity or specificity
depend greatly on the design of the screen and most capacity formulas assume the screen design is correct for the application. this assumption is not always justified. a scalping screen used as a finishing or dewatering screen would have a greatly reduced capacity. a finishing screen used as a heavy scalper would also have a greatly reduced
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i had a problem today with excel 2003(win xp)not copying formulas. when i copied and pasted i would get the results of the formula as it/they existed in the original cell(s) rather than the