I am looking for an expression to determine the effective pressure on a rectangular surface due to wind. I have an application where the wind speed can reach a maximum speed of 20 mph and need to determine the effective pressure. Thanks in advance for your help.
Since you are designing the frame out of rectangular tubes, you can also add damping by filling the structure with a vibration absorbing grout. The tubes will have to be mitered with openings to allow the grout to travel. You will need two holes in the structure, one for filling and one for...
In the "Standard Handbook for Mechanical Engineers" by Marks, there is an equation for torque capacity of a spline. The equation is T=L*D*D*S/1.2732, where L is the spline length, D is the pitch diameter of the spline, and S is the allowable shear stress of the spline material. I...
This is an excellent application for Finite Element Analysis (FEA).The model would be fairly easy to build and the results should not only give you the radial deflections at the OD and ID but also confirm the force/axial deflection relation.
The HP equation in the form FORCE x VELOCITY/33000 may be the best one to use. FORCE is in pounds and VELOCITY is in feet per minute. If you can determine how much force is required and then the speed at which the paper is threaded, the HP can be determined with the above equation. I would...
We have created very useful manuals using digital photographs imbedded in WORD documents. The digital photos can be easily inserted as bitmap or jpeg images. Using photos, you can very effectively demonstrate assembly procedures and other routine maintainence. Showing the assembly procedure step...
It may have more to do with the thickness of the plate and the way it is supported rather than the effect of the stress concentration. I would suggest using Fomrulas for Stress and Strain, 5th ed, by Roark. Table 24, cases 20 thru 23 deal with plates with a central couple. Using one of these...
Here are some ideas that I hope will help. Determine a torque at the wheels based on the weight x a rolling coefficient of friction (Mark's HB has values like .02 for this). Next, determine the rpm of the wheels based on the speed you want to move the load at. Now, the horsepower would equal T x...
Here is one way to determine the effective force. First calcualte the energy of the impact by .5 x mass x Velocity**2. This would be the velocity and the mass of the object that is impacting the column. This energy would be absorbed by the column based on the...
Try using one of the calculation methods in "Formulas for Stress and Strain" by Roark. You might be able to equate your problem to one of the cases in this book.
The mode of failure for the tapped hole most likely would be a shear failure across the threads in the plate. You can calculate this stress by using the equation:<br>
tau=2*F/pi/dia<br>
Now, compare this value to the shear yield of the plate material. Typically, you should have about 1.5...
I recommend the following:<br>
Mechanical Engineering Design by Shigley for a general reference of Machine Design. This will cover general stress and strain, machine elements (gears, shafts, etc.).<br>
Gear Handbook by Dudley (as Clair suggested) is great for advanced gear design and...
I have used ANSYS when it was primarily a "mainframe" style program. In recent years, I have used ALGOR and found it to be easier to use. The preprocessing and postprocessing tools are easy to learn. I feel you also need to review the element library of the programs to make sure that...
The bolt pre-load is applied when there is no additional load applied at the joint. When the external load is now applied, ideally, the compression at the pre-loaded surface is reduced by the amount of the external load. If the initial bolt pre-load is higher than the external load, then the...
1.24 in/sec is an extremly high vibration reading and is in the "Very Rough" range of the General Machinery Vibration Severity Chart. I would suggest taking readings at the support points (bearings) of the pump rotor and compare these to the maximum reading. You may find a high amount...
