University:
Georgia Southern University
Course:
ENGR1121 | Computing in Mechanical Engineering
Academic year:

2024
Views:

150

Pages:

1
Author:

Jalen W.

ENGR1121 Z – Computing in Mechanical Engineering Lab 2D Plotting Lab due: end of lab Total points: 20 Labs are to be individual work. You may use MATLAB Marina, MATLAB’s help, and your notes. Lab work will be graded during lab time and working results must be shown to the lab instructor by the end of the scheduled lab time. All MATLAB programs and functions must be completed and submitted in accordance with the Computing Assignment Format and the MATLAB Coding Style. Submit an electronic copy of your lab work to the appropriate Dropbox Folder in GSU’s Folio by the end of lab. No hard copy needed unless specifically requested by the instructor. Grading Each problem will be graded according to: program design (identifying inputs/givens, process, and outputs; algorithm) and program style (program comments, variable names, proper formatted input and output including units) 25%, and program correctness 75%. Lab Work All plots must be completed annotated with axis labels, titles, legends, etc. as applicable. Write MATLAB programs to do the following problems: 1. (6 points) Calculate the velocity of a falling parachutist from time 0 to 50 seconds using the equation: mg − ct m v = 1 − e ( / ) given m=75 kg; g=9.81 m/s^2 and c=10.5 kg/s. Make sure you select an increment in c your time vector that is small enough to give you a smooth curve. a. Plot v(t) vs t (t on the x-axis and v(t) on the y-axis) in a figure window. b. Change m to 100 kg and c to 15 kg/s and re-evaluate the velocity. c. Plot the new v(t) vs t (t on the x-axis and v(t) on the y-axis) on the same figure window. Use a legend for identification. ( ) 2. (6 points) Plot the x versus f(x) for the following piece-wise function g: 10 x<0  f ( x= 0≤ x≤9 for − 5 ≤ x ≤ 30 ) 10 x + 10  15 4 x + 10 x > 9 Create separate arrays for the pieces of x (x1, x2, and x3); evaluate the piece-wise function f(x) for each piece (creating f1, f2, and f3) before plotting f(x) versus x. 3. (8 points) Download and load the h(t) vs t data (htdata.mat) from Folio. a. Plot h(t) vs t in a figure window (Figure 1) using a green dashed line. b. Use indexing to extract the data (t and h(t)) for the time range time range 5.0 ≤ t ≤ 12.0 . c. Plot h(t) vs t for the shorter time range in a figure window (Figure 2) with a red dotted line. d. Plot both cases in a figure window (Figure 3) as a subplot (tiled vertically) e. Plot both cases in a figure window (Figure 4) on the same canvas. Use a legend for identification. 1 Instructor: Dr. Priya Goeser