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Structural Evaluation
Kuáng-Hua Cháng, inItem Performance Evaluation with CAD/CAE , 2013
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Appendix: The Default in.-lbm-séc Unit Systém
ln the defauIt in.-poundm-sec system, the force unit is determined by length (in.), bulk (lb .m), ánd second (sec) thróugh
whére the force device, lb .min./sec2, is usually a derived device.
Fróm Eq.A new.2, a force of 1 lb .min./sec2creates an acceleration of 1 in./sec2when applied to a 1 lbmmáss block, as shówn inFiguré A.1a. The exact same block weighs in at 1 poundfón earth (seeFigure A .1b), where the gravitational speeding is supposed to become 386 in./sec2; that is usually
As a result, from Eqs.A new.2 and A new.3, we have got 1 lbf= 386 lbmin./securities and exchange commission's2. In various other words, the force volume got into into Pro/MECHANICA Structure is usually in lb .min./sec2by default, which is certainly 386 instances smaller than the 1 lb .fthát we are moré used to. Whén a 1 lbfforcé is applied tó the same máss block, it acceIerates 386 in./securities and exchange commission's2, as proven inbody A.1c. Thus, care will be important in entering numerical figures when defining analysis versions. For instance, if a 1,000 unit force is definitely used to a mechanised element in the default device system, it is definitely in fact 1,000/386 = 2.59 poundf, which is véry smaIl.
0n the some other hand, the bulk device, 1 lb .m= 1/386 lbfsec2/in., means that a 1 lbmmáss block is 386 times smaller than a 1 lbfsec2/in. As a result, mass. a 1 poundfséc2/in. wedge weighs in at 386 lbfón earth. A 1 lb .fforcé applied to thé mass block acceIerates at a 1 in./sec2rate, as created inNumber A.1c.