Advanced Materials and Processes: HAAMER Balloon Platform Final Report

This report details the design and analysis of a high-altitude balloon platform (HAAMER), focusing on materials selection and structural considerations. It includes calculations for atmospheric conditions, such as temperature, pressure, and density at various altitudes, and the forces acting upon the balloon. The report also outlines the design of the balloon's structure, including the selection of materials like aluminum and acrylic, and the processes used for manufacturing such as water jet cutting and 3D printing. Furthermore, it presents the cost of the materials and the manufacturing processes. The report also includes the ascent and descent rate calculation of the balloon. The document also presents the 3D model of the structure.

DESIGN OF
STRUCTURE

INTRODUCTION:
• A weather ballon is specifically design to carry instruments to high
altitude and sends back information on pressure, temperature,
humidity etc.
• The design of structure has an importance as well as critical. As the
parameters are different in ascending than the parameters while
decending.
• While ascending the structure has to go against gravity and the
pressure decreses while the altitude increases.
• While decending the gravity acts directly on the structure and the
pressure increases as it enters the atmosphere.

US Standard Atmosphere:
Height (KM) Temperature (K) Pressure (atm) Temperature Gradient
(K/KM)
0.00 288.15 1.00 -6.50
10.0 216.5 0.22 0.00
20.0 216.5 0.05 1.00
30.0 228.65 0.01 2.80
50.0 270.65 0.00 -2.80

Calculation:
• Geopatential Altitude:
h = (rez)/re + z
re is the radius of earth
z is the real altitude
Also acceleration due to gravity changes with altitude
g(z) = Gme/ (re + z)2
me is the mass of earth

• Temperature (at any altiitude) Calculation:
T = Tbase + dT dh
• Pressure (at any altitude) Calculation:
pr = pbasee-(GMR dh/Tbase)
• Density (at any Altitude) Calculation:
ρr = pr / (Talt + Tbase)

Graph for Temperture, Pressure and
Density:

• Ascent Rate:
Bouancy force:
F = mg
m = ρV
FB = V (ρHe − ρair)g
Drag Force:
FD =cdρv2A/2
Based on the calculation the 3D model of the structure is designed.

Cost of the Structure:
Material Quantity Cost
Aluminum Sheet 1200 x 2400 x 2
mm
1 no $65
Water Jet Cutting 3200 mm $32
Acrylic 800 x 580 x 3 mm 1 nos $32
Laser Cutting 3600 $72
3D Printing 1 $50

Thank You