MAE 1106: Introduction to Aerospace Engineering Spring 2022
Laboratory Report # 3 Guidance
Balloon Sizing
Dr. Budhyant Venepalli
Adjunct Professor [email protected]
GTAs:
001, 005 and 006 No GTA [email protected] 002, 003 and 004 Medina, Jose Antonio [email protected]
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This document provides guidance for the preparation of the third lab report. Please use the provided Lab Report Template and address each of the topics below within the specified section. Ensure that the answers to the specified questions are easily identifiable in your lab report, and in the order in which the questions are specified in this document. Show all necessary equations and sample calculations to support your answer. As a reminder, please keep in mind that the Lab Report document needs to follow the structure and formatting provided in the Lab Report Template document provided. To emphasize the importance of these aspects in the formal communication process, 20 points out of a total of 100 are assigned for document structure and formatting. The number of points assigned to each question out of a total of 100 is indicated below. 1. Balloon Sizing Let s be you class section number, and m be the number formed by the last four digits of your UTA student ID. The value of the altitude A, in m, to be used below is given by A =3,000 + 1,000s + m. You have been given the assignment to size a He balloon for float condition at an altitude A for given the real atmospheric conditions in the weather sounding data for the FWD station on the day of your MAE 1106 class section lab meeting at 12Z. The balloon is assumed spherical, with a radius R to be determined, and with a hull envelope made of Mylar film with a thickness of 0.001 in. The He inside the balloon at float is assumed to have an overpressure of 2 in H2O compared to ambient pressure, and the same temperature as ambient air. The mass of the payload to be supported by the balloon is 1 kg. Assume that the acceleration of gravity is 9.80446 m/s2.
a. (5p) Under Balloon Mission Assignment clearly and completely state the balloon mission assignment for which you are performing balloon sizing.
b. (5p) Under Atmospheric Data provide a clear and concise description of the atmospheric data (time, location) you have used and the source of the data, and the corresponding p, T, air density, and wind conditions at altitude A. Use consistently SI units. c. (40p) Under Balloon Sizing Exercise Results provide the process and the equations used, the values of material properties used and the sources for
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the information, and the resulting balloon radius, balloon volume, balloon envelope area, and balloon envelope weight. Please also determine the weight of the lifting gas, the pressure of the lifting gas and its density. d. (10p) What would happen if the balloon is forced to an altitude 500 m lower? Would the balloon still be overinflated? Would the balloon system still be in equilibrium? e. (10p) What would happen if the balloon is forced to an altitude 500 m higher? Would the balloon still be overinflated? Would the balloon system still be in equilibrium? f. (10p) Conclusions.
MAE 1106 Lab Report #3 Grading Summary Formatting: 20/100 1. Balloon Sizing
a. Balloon Mission Assignment 5/100 b. Atmospheric Data 5/100 c. Balloon Sizing Exercise Results 40/100 d. Balloon Descent 10/100 e. Balloon Climb 10/100 f. Conclusions 10/100
Overall Lab Report Grade: 100/100
