(Bug?) HP48 Equation Library

[SlideRule]

(02-13-2017 03:10 AM)Mark Hardman Wrote:  Using the example solution on page 59 of the HP Solve Equation Library manual, I get the same result for \( Mx \) regardless of the value specified for \( c \).

Han
The value of c is most definitely used to calculate and plot the TOTAL MOMENT at point x on cantilever beam of length L. The value of c in relation to x indicates WHEN the moment at c contributes to the total moment at the point under consideration, x.
I've attached a PDF output for a cantilever beam analysis to facilitate this discussion. The discontinuity in the MOMENT CURVE at point 4 stems from the moment applied at point 4. However, if the moment is applied at point 1, the discontinuity will shift to point 1. and the value of the moment at point 2 will be reduced (or increased depending on the SIGN of the applied MOMENT) accordingly.
I'm uncertain HOW the HP-48 queries for the position value of an applied moment since my 48's are currently in storage so I can NOT address this line of discussion. The given equation seems to omit the relevance of the position (c) of an applied moment but ... the correlation of the actual algorithm and the equation is implied for civil, mechanical, structural etc. engineers.
[attachment=4482]

Again, not knowing your expertise nor the frequency of exposure to Statics, I hope this is helpful and furthers useful discussion.

BEST!
SlideRule