Chapter 12321Now we can check the performance at cmin, ¯c, and cmax. Of immediate interest is the fomof the median clearance assembly, −9.82, as compared to any other satisfactory bearingensemble.If a nominal 1.875 in bearing is possible, construct another table withtb=0 andtd=0.cbd¯TfTmaxhoPstTmaxfosfom0.00201.8791.875157.2194.30×±±±−7.360.00301.8811.875138.6157.10±−8.640.00351.8821.875133.5147.10±−9.050.00401.8831.875130.0140.10±−9.320.00501.8851.875125.7131.45±−9.590.00551.8861.875124.4128.80±−9.630.00601.8871.875123.4126.80×−9.64The range of clearance is 0.0030<c<0.0055 in.That is enough room to ﬁt in our de-sign window.d=1.875+0.000−0.001in,b=1.881+0.003−0.000inThe ensemble median assembly has fom=−9.31.We just had room to ﬁt in a design window based upon the (ho)minconstraint. Furtherreduction in nominal diameter will preclude any smaller bearings. A table constructed for ad=1.750 in journal will prove this.We choose the nominal 1.875-in bearing ensemble because it has the largest ﬁgureof merit.Ans.12-19This is the same as Prob. 12-18 but uses design variables of nominal bushing bore bandradial clearancec.The approach is similar to that of Prob. 12-18 and the tables will change slightly. In the
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