Concept Review - P08001 Balance Training Bicycle

Transcription

1 Concept Review - P08001 Balance Training Bicycle Team Members Jennifer Zelasko - IE Carl Mangelsdorf - ME Jeff Tempest - ME James Nardo - ME Jon Bawas - EE Invited Participants Dr. DeBartolo ME (Guide) Dr. Kempski - ME Dr. Marshall - IE

2 Meeting: Senior Design Concept Review - Balance Training Bicycle Time: Thursday (January 24, 2008) from 4pm to 6pm Location: Room Building 9 Meeting Objective: Analyze and validate the functionality and robustness of the current concept. Also, ensure customer needs and engineering specifications are met.

3 Background Information Intermediate step between a stationary and traditional bicycle. Balance training for recovering physical therapy patients. Free care provided by the Nazareth College PT Clinic. stroke victims neurological problems weak left/right side of body A physical therapist will be spotting the patient riding the Balance Training Bicycle at all times. Safety of both the patient and the physical therapist is a priority in the design.

4 Agenda 4pm 5pm Overview of Design Process Customer Needs and Related Engineering Metrics [5 minutes] Engineering Specifications [10 minutes] Mechanical Design Concepts 5pm 5:30pm Discussion of Well Established Concepts [10 minutes] Discussion of Tilt Resist Concepts [35 minutes] Safety Design Concepts Preliminary Hazard Analysis [15 minutes] - Concepts to prevent foreseeable hazards Feedback System Concept [10 minutes] Audio / Visual

5 QFD Matrix

6 Specifications

7 Overall Concept Pivoting Arm w/ Locked Positions Telescoping Handlebars w/ Pin-lock Swiveling Handlebars w/ Pin-lock Telescoping Seat Height w/ Pin-lock Tilt Resistance - Adjustable Spring Assembly Pillow Block Ball Bearing To Allow Lateral Tilt (X2) Wheels For Portability Pedal With Built In Resistance Knob (Purchase) Pin-lock control for upright Locked Position

8 Breakdown of Individual Concepts

9 Pivoting Arm w/ Locked Positions Incremental-Angle Hinge Push Button Adjustment Ergonomic Design Adjustable to different patient sizes Pivot arm with gear teeth and wing nut compression

10 Swiveling Handlebars w/ Pin-lock Ball joint swivel bearing

11 Telescoping Seat Height and Handlebars w/ Pin-lock Spring Plunger Pin (not removable) Mount pin on outside cylinder Spring Loaded Button on Pin (removable) Inside cylinder has series of holes to position seat height Ergonomic Design adjustable to different patient sizes

12 Pin-lock control for upright Locked Position Located at rear of bike where PT stands to spot patient Spring loaded Pull up and turn 90 degrees to keep nose pin up in un-locked position

13 Pillow Block Ball Bearing To Allow Lateral Tilt (X2) Rotating axis Safety Low Cross Member Easy On / Off

14 Pedal With Built-In Resistance Knob Adjustable resistance knob Safety No chains / wheels -Low cross member

15 Wheel Barrow design Ergonomic Design Easy to roll Light lifting Wheels For Portability

16 Tilt Resistance -Adjustable Spring Assembly Non-linear spring inside of cylinder Adjustable piston used to compress spring, varying tilt levels

17 Tilt Resistance - CONCEPT 1 Mounting bolt threads into worm w/ double nuts and washers to allow rotation Spring compression is adjusted by spinning outer case Viewable piston height allow PT to select level of tilt and also provides upper piston movement Worm slides in and out of bottom piston with fairly tight tolerance to avoid binding

18 Tilt Resistance - CONCEPT 2 Same Concept Spring compression is adjusted with worm gear Piston Fixed to worm gear

19 Tilt Resistance - CONCEPT 3 (Cable and Pulleys) Side View Front View Top View Spring compression is adjusted with Winch Winch remote control to rear of bike Safety - Cable / Pulleys / Winch enclosed inside of guard cover

20 Tilt Resistance - CONCEPT 4 (Door Handle)? Top plate - Bump Stops

21 Safety Concepts Minimized moving parts Low cross member Easy on/off Adjustable seat height Adjustable handlebar length and tilt degree Wheel Barrow portability

22 Safety Concepts Foot Straps Wrist Straps Wide Seat Safety Guards/Covers over moving parts and pinch points Cruiser style handlebars relaxed wrists good riding posture

23 Feedback Subsystem Sensor Inclinometer Based on accelerometer technology Outputs analog voltage Ex: 44.4mV / degree Voltages will be used to drive both audio and visual display to patient and PT Current Issue: Need to determine appropriate tilt ranges for balance and tip-over warnings Resolution: use sensor to test on PT patients to find average tilt ranges to be fine-tuned in final product

24 Feedback Subsystem Audio / Visual Display Concept Visual Feedback LED Bank indicating direction and level of tilt Color Code Green normal tilt range Yellow region to correct balance Red Tip-over condition imminent Audio Feedback Speaker provides audio feedback Adjustable volume Beeps occur at yellow and red warning levels Volume and pitch remain constant, but as tilt level increases, the intervals at which the beeping occurs will increase