UI Marching Band Mobility Platform

It is the goal of the University of Idaho Mechanical Engineering Department to design and fabricate a "Band Mobility Platform" (BMP) for the University of Idaho Marching Band as a continuation of the "Band-Beesten" legacy. The BMP will be an electrically-driven, remote-controlled stage that enables a variety of otherwise stationary performers to perform with a stunning light show in coordination with the marching band.

=Problem Definition=

Deliverables
Small Scale Model to Demonstrate Project Feasibility Full Scale Prototype Modeling of Finished Design Experimental Results/Design Validation
 * Primitive Circuitry and Motor Control Algorithms
 * Laser Cut Wooden Frame and Bolt and Spring-Bolt Suspension System
 * Refined Circuitry, Motor Control Algorithms, and Recharging System
 * Aluminum Frame with Independent Suspension System and Variable/Modular Wheel Positioning
 * Fully Function Performance Activated Lighting Arrangement
 * 3-D Model of the Frame and Suspension System
 * Structural Analysis of the Frame and Suspension System
 * Circuit Analysis on the Power-Control System
 * Translational and Rotational Speed
 * Stability Under Static and Dynamic Loads
 * Battery Duty and Recharge Cycle Periods

Specifications
Functional Requirements Mechanical Requirements Electrical Requirements Software Requirements Environmental Requirements Cost Requirements
 * Motion shall be controlled via remote control by a pilot not located on the platform.
 * The lights of the BMP shall be controlled by the musician located on the on the BMP via regular playing of the applicable instrument which activates shock activated piezoelectric sensors.
 * The design shall be able to support,translate,and rotate a load of 1500 lbs.
 * The stage shall not exceed a length 9 ft nor a width of 7 ft.
 * The total system shall weigh no more than 500lbs.
 * The design shall have a universal mounting system to accommodate a drum set, piano, and a txalaparta.
 * The system shall have a life cycle of years with no component failures.
 * The platform shall translate at a marching pace of 160 steps per minute with a stride of 23 in.
 * The wheels shall remain in contact with the Kibbie Dome field terrain and support equal loading at all times.
 * During operation the voltage shall remain at 24V. The amps will be 3.2 and the resistance will be 0.089 Ohms.
 * The PCS shall be designed with a capacity to operate the entire BMP for a minimum of 15 minutes on a single charge.
 * The software shall be capable of receiving RC input signals from a maximum distance of 20 yards and input signals from the instrument-mounted sensors. The software shall be capable of operating relays which will distribute power from the battery bank to the PCS, motors, and lights as received by the RO and performer.
 * The RO shall utilize a standard radio controller with joy sticks for controlling the left-right and forward-reverse translational movements of the BMP. The performers will control the lights via the drum set and/or the piano.
 * The Product is expected to have full operational capabilities in environments with ambient temperatures of 32F to 100F.
 * The PCS shall comply with the UL 1642 standard for lithium batteries.
 * Cost to build a POC prototype shall not exceed $1400.

=Design Considerations=

Final Conceptual Design
'''Modular Variable Wheel Quantity and Offset with Independent Suspension '''
 * 4 or 6 Wheel Modular Configuration
 * 3 Offset Positions
 * Independent Suspension

=Project Learning=

Frame and Suspension
The first design iteration was an asymmetric double wishbone frame with three points of contact between the frames and the ground, even load distribution would be assured via flexing of the frames. The most notable problem with this design was the asymmetric frame and wheel positioning would prevent smooth forward and reverse translation. The second most notable problem with this design was that the frame would have to be fine tuned for a very specific stiffness to act as both a suspension and safe support structure. The second design was the same concept as the previous design double frame except the wheel placement was symmetric which would allow for unbiased translational movement. This design better meets the customer requirements as translational movement is a higher priority than rotational movement. However, the problem of the complex frame still persists.

The third design was to eliminate the double wishbone frame for a single frame with independent suspension to reduce the cost the design and the complexity of the development. The single frame independent suspension design allows for the same even load distribution as before but with design better for manufacturablity, for the much of the suspension is able to be purchased off the shelf.

=Final Design=

=Validation=

=Team Members=

=Additional Documentation=

Project Schedule



Meeting Minutes

Presentations



Client Interview