Recent content by minoroctave

Homework Statement in the picture, what is the 'tight side' of the v belt on pulley c? Homework EquationsThe Attempt at a Solution is it the F1 side? I don't know how to identify this

Homework Statement I am supposed to examine the effectiveness of a vibration absorber design for a quad copter. Attached is a picture of the quad copter and the design; basically each of the spring dampers would be attached to an arm of the copter. In the case of a single quad copter arm, what...

thanks! also, after I obtain the stiffness values of the blade and the arm, how would they be combined into one representative stiffness value? for example, in the case of one arm with its two blades, how would the stiffness their values be combined?

yes, I want to calculate the overall stiffness of the arm. from here https://www.engr.colostate.edu/~dga/mech325/figures/elastic.pdf , there is a equation for the stiffness of a loaded cantilever beam that involves knowing the second moment of area.but its for uniform cross section. So do I...

yes, i think so. is that the same thing as the second moment of area? i am not sure

does anyone know how to calculate the second moment of area of a typical quadcopter arm like this? what should I approximate the cross section as...

in the case of the picture below, for the central plate of thickness 1 inch, is it the force on a bolt F/2 divided by 2at that results in F/4at ?thanks

thanks. do you also know what is meant by the "shank of the attachment" and the "base area adjacent to the weld"?

thanks. also, for bearing stress in the members, what is the reason for it being ##\frac{F}{2dt}## ? In the solutions, I see ##\frac{\frac{F}{4}}{\frac{t}{2} d} = \frac{F}{2td}## , but don't know why

does the force F cause shear in the welds?

for the shear equations, it says the area is supposed to be the total cross sectional area of all the bolts in the group. So since each of the shear planes has a shear force F/4, and an area πd2/4 and since there are four bolts, so ## \frac{\frac{F}{4}}{4 ( \pi \frac{d^2}{4})} ## =...

In the question they say a "1/2 by 2 in rectangular cross section". Does this mean the dimension of 1/2 is actually into the page and not as shown in the diagram? Also, In the solution there is mention of "the base metal adjacent to the weld" and "shank of the attachment". What areas are these...

so shear only exists at the shear planes? doesn't it vary between the planes like this: http://postimg.org/image/3z13rz8kj/

as opposed to anywhere else between the bolt head and the nut

but according to the definition they gave, shouldn't t be the thickness of the thinnest plate. in the question, its also mentioned that: "F/2 is transmitted by each of the splice plates, but since the areas of the splice plates are half those of the center bars, the stresses associated with the...