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Mont Alto Projectile Project (M.A.P.P.) Critical Design Review Penn State Mont Alto 12/17/08 Team Members Kylie Flickinger – Mechanical Engineering Adam Kuhlman – Data Acquisition William K. McDannell Jr. – Software Chris Small – Strain Gauge Board Robert Stottlemyer – Team Leader
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Penn State Mont Alto
Kylie Flickinger – Mechanical Engineering
Adam Kuhlman – Data Acquisition
William K. McDannell Jr. – Software
Chris Small – Strain Gauge Board
Robert Stottlemyer – Team Leader
Tim Svirbly – Test Equipment Development
The purpose of this experiment is to investigate the mechanical stresses in an elastic structure during the flight of a sounding rocket. The structure proposed consists of a circular plate, the deck plate, which is supported by four longerons, which connect in turn to circular plates at either end of the longerons simulating a payload section of previous sounding rocket flights. A dummy mass is attached to the center of the deck plate. During the flight, dynamic loads in the axial and lateral directions will cause the deck plate to deflect. The resulting deformation will be measured at selected points using strain gauges connected to electronic boards to obtain time-varying voltage signals which in turn will be digitized and stored for later analysis. The obtained data will be compared to theoretical predictions. Careful pre-flight calibration of the entire data stream will be conducted.
See next slides
standard SD or SPI communication. 3 Volt power
Shift in center of mass along length axis on rocket
# Item Status # Item Status
4 Brace A designed 1 Test Weight Completed
4 Brace B designed 4 Trays Completed
8 Brace C designed
1 Bottom Disk designed
1 Deck Plate designed
1 Top Disk designed
4 Longeron designed
Electronic Parts :
# Item Status
2 Strain gage board Modification needed
1 Power regulator board Modification needed
1 G-switch and associated electronics - needs more design work
1 data acquisition/storage + controller - needs more design work
m = 10.86 lbs (< 12.75, the heavy test mass can be reduced)
Center of mass 0.35” off axis and 1.06” below geometric center. Because electronic boards and tray for the BU experiment have not been included, the center of mass will move slightly closer to the geometric center.
Entire structure fits into a cylinder of 9” (<9.2) diameter and
9.275” (<9.4) height leaving 0.125” for washers.
Connection with 5 bolts to top and bottom bulk head , respectively, is provided.
a battery , a G-switch, and shorting wires to Wallops shorting plug form a complete loop with electric current flowing only if both the G-switch and shorting plug are in closed position simultaneously. Once current is flowing a circuit consisting of a second battery (ies) and all electronic boards is activated using a solid-state latched relay and switch transistor. This second loop maintains itself even when the G-switch subsequently falls back into its open position (during ballistic flight phase). See slide 29
Sharing mechanical structure but independent power supply, controller, data acquisition, and data storage. Possibility of future sharing of these items is not excluded .
Dr. Siegfried Herzog
Penn State University at Mont Alto
Assistant Professor of Mechanical Engineering
1 Campus Drive
Mont Alto, PA 17237
Tel (717)-749-6209 Fax (717)-749-6069
Dr. Michael Ruane
Professor, ECE Dept.,
8 St. Mary's Street, Boston, MA 02215
Phone: 617-353-3256 617-353-6440 fax