in chapter 10 of "introduction to Agricultural Engineering Technology a problem solving approach" 3rd edition book, I've met this problem however it's calculated with a wrong parameters and calculation within the book itself, but I've tried to solve it with the right parameters according to what's mentioned in the book but with a non-realistic answer?!
Also check https://www.progressivegardening.com/agricultural-engineering-2/metric-problems-nzr.html#!
many thanks for your answers Mr. Chinaza Godswill Awuchi
i have discovered the wrong specifically within this equation:
drawbar power(kW)P = Force(N)F x Velocity(km/hr)V ÷ 3600
the problem with the textbook that uses a wrong units constants and also use a wrong parameter for a straight point blade not a shovel as mentioned in the problem, i've tried to solve the problem again lately and i guess i got the right answer this time.
See page 64 of this attachment.
http://www.jnkvv.org/PDF/04042020122506Notes%20FPM%20COH%20Rehli%20by%20DMK.pdf
Good afternoon,
It's good that you yourself discovered an inaccuracy in the calculation. It seems to me that in the future, you just need to take a closer look at the values included in the formulas and try to substitute the values in the international system into the formulas. The coefficients that are given in the old systems need to be recalculated in advance to the international one, otherwise confusion and unrealistic results are possible. The depth of cultivation and the width of the soil capture should be taken in (m), the speed of movement in (m / s), hardness in N / m ^ 2, etc. Then, when calculating forces, you will always get them in Newtons, and when calculating power, you will get it in Watts. Converting them to more convenient values of kilonewton and kilowatt is generally simple. I wish you Success!
Anatoly Kudzaev am totally agreed with you, i should rearrange all of the units used with a problem in one unit system to get a correct answer
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