1. The first step is to count how many branches there are on this tree, how many leaves there are on each branch and how many grams each leaf weighs, and then multiply them in turn (approximate calculation method).
2. Step 2, cut down the tree, weigh it, then spray chemical reagents such as paraquat and defoliant on the tree, and then weigh it after all the leaves have fallen out.
The next step is to calculate the weight of leaves, that is, the weight of leaves is: tree weight before defoliation-tree weight after defoliation = leaf weight.
Accurate calculation method: using a leaf area tester, first measure the area and weight of a leaf 1653α g/m2, then measure the total leaf area of the tree β m2, and finally: β m2 ÷ α g/m2 = the weight of leaf seeds (approximate calculation method).
Extended data:
Rough calculation is an approximate calculation, assuming that the shaft is only acted by torque to reduce the allowable torsional shear stress of the material, and considering the influence of bending moment. Therefore, the strength of important shafts should also be checked.
Approximate calculation of shaft diameter Approximate calculation formula of minimum diameter of torque section of shaft in line diagram. Although the form is simple, the calculation is still complicated. Therefore, the author draws a rough calculation line diagram of shaft diameter to simplify the design.
When the power input (transmitted) by an important official is P, the approximate calculation formula of the minimum diameter d of the torque section of the shaft is: where: d-the minimum diameter of the torque section of the shaft, mm.