1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Speed Profile - Numerical Integration

  1. Sep 11, 2012 #1
    1. The problem statement, all variables and given/known data

    I need to find total distance travelled for an object using the speed profile

    which is the absolute value of velocity before integrating. so we finish up with the total distance travelled, rather than the final displacement from the initial position.

    And this is the function i need to numerically integrate using the The Trapezium Rule.
    Needed Values:

    The h Value-
    The N Value-
    The Total Area-

    I Have Data Sets Which is Shown In The Picture Below


    Calculate the total area under the curve for a data set, starting with an h value of 0.1 and then continuing with h = 0.01, 0.001, etc. until the latest two calculations are within 0.0005of each other, or h becomes 0.00001.

    Could Someone Use One of The Data Sets to Show Hows it Done Then i'll Do The Rest of Them

    2. Relevant equations

    Velocity Profile V(x) = x2+ b. x1+c x0+ d.x-1

    defined by the 3 coefficients for the powers of x1, x0, and x-1:
    Remember that
    x1 = x
    x0 = 1
    x-1 = [itex]\frac{1}{x}[/itex]

    So, the most interesting thing about this velocity profile is that it is undefined when x equals 0.

    Speed Profile Sp(x) = |x2+ b. x1+c x0+ d.x-1|

    Areai = h [itex]\frac{F(xi)+F(xi+1)}{2}[/itex]

    with Xi+1 = x1+h

    N = [itex]\frac{(xfinal-xinitial)}{h}[/itex]

    Total Area = Sum of the Areai values from 0 to N-1

    3. The attempt at a solution

    |x2+ b. x1+c x0+ d.x-1|
    |x2+ 1. x1+4 x0+ -6.x-1|
    Last edited: Sep 12, 2012
  2. jcsd
  3. Sep 12, 2012 #2
    Please Help =(
  4. Sep 13, 2012 #3
    Can Anyone Help me or Point me in the right direction>?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Speed Profile Numerical Date
Calculating distance from speed Jan 11, 2018
Related rates shadow speed Sep 23, 2017
A Velociraptor is pursuing you... Feb 11, 2017
Temp profiles through partial derivatives Apr 16, 2013