Box Weight Research Articles

A study of the effect of weight functions on energy averages

A class of weight functions, parameterized to yield Lorentz weight function in one extreme and a weight function close to the box weight function in the other, is used to study the effects of weight functions on energy averages. It is shown that if, for each choice of weight functions, the maximum is taken to be equal to the height of the box weight function, then the energy averages are almost independent of the weight functions.

Optimize agricultural product size sorting operation by dynamic programming method

A general dynamic programming method was developed for size sorting agricultural product so that optimization with respect to any decomposable (in dynamical programming sense) objective may be obtained. The theory was applied to solve papaya (a tropical fruit) package weight control problem. The result was significant and the actual mean box weight deviation from the labelled weight can be reduced approximately one-third compared to the present weight deviation as a result of the weight control method practised by the packers now.

Wing box optimization under combined shear and bending.

A method is presented for determining the optimum proportions of a minimum weight multirib or multiweb wing box structure subjected to vertical shear and unidirectional bending moment. The optimization expressions are presented in general form to encompass any combination of cover and support structure for which individual efficiency equations are available. The optimum wing box design is determined by minimizing total structure weight, including the compression cover panel and appropriate substructure. The influence of minimum gage and fastening material can be included for the support structure. It is shown that the effect of vertical shear on the spacing of the webs is equally as important as the moment load in determining the minimum box weight. In a design example, three cover configurations are compared for both the multirib and multiweb structural concepts for a typical high aspect ratio wing. A table of 23 optimized wide column and compression panel cover concepts is presented, including the necessary design equations and graphs for any desired structural efficiency. An analysis for corrugated shear webs, optimized for simultaneous shear buckling, is included.