Concept Review - P08001 Balance Training Bicycle Team Members - - PowerPoint PPT Presentation

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

Meeting: Senior Design Concept Review - Balance Training Bicycle Time: Thursday (January 24, 2008) from 4pm to 6pm Location: Room 4435 - Building 9

Meeting Objective: Analyze and validate the functionality and robustness of the current concept. Also, ensure customer needs and engineering specifications are met.

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.

Agenda

4pm – 5pm Overview of Design Process

• Customer Needs and Related Engineering Metrics [5 minutes]
• Engineering Specifications [10 minutes]

Mechanical Design Concepts

• Discussion of Well Established Concepts [10 minutes]
• Discussion of Tilt Resist Concepts

Discussion of Tilt Resist Concepts [35 minutes] [35 minutes]

5pm – 5:30pm Safety Design Concepts

• Preliminary Hazard Analysis [15 minutes]
• Concepts to prevent foreseeable hazards

Feedback System Concept [10 minutes]

• Audio / Visual

QFD Matrix

Specifications

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

Overall Concept

Breakdown of Individual Concepts

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

Swiveling Handlebars w/ Pin-lock

• Ball joint swivel bearing

• Spring Plunger Pin (not removable)
• Mount pin on outside cylinder
• Inside cylinder has series of holes to

position seat height

• Ergonomic Design – adjustable to

different patient sizes

Telescoping Seat Height and Handlebars w/ Pin-lock

• Spring Loaded Button on Pin

(removable)

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

Pillow Block Ball Bearing To Allow Lateral Tilt (X2)

• Rotating axis
• Safety
• Low Cross Member – Easy On /

Off

Pedal With Built-In Resistance Knob

• Adjustable resistance knob
• Safety
• No chains / wheels
• Low cross member

Wheels For Portability

• “Wheel Barrow” design
• Ergonomic Design

– Easy to roll – Light lifting

Tilt Resistance -Adjustable Spring Assembly

• Non-linear spring inside of cylinder
• Adjustable piston used to compress spring, varying tilt

levels

Spring compression is adjusted by spinning

• uter case

Mounting bolt threads into worm w/ double nuts and washers to allow rotation Worm slides in and out of bottom piston with fairly tight tolerance to avoid binding Viewable piston height allow PT to select level of tilt and also provides upper piston movement

Tilt Resistance

• CONCEPT 1

Piston Fixed to worm gear

Same Concept – Spring compression is adjusted with worm gear

Tilt Resistance

• CONCEPT 2

Top View Side View Front View

Tilt Resistance - CONCEPT 3

(Cable and Pulleys)

• Spring compression is adjusted with

Winch

• Winch remote control to rear of bike
• Safety
• Cable / Pulleys / Winch enclosed

inside of guard cover

Tilt Resistance - CONCEPT 4

(Door Handle) Top plate

• Bump Stops

?

Safety Concepts

• Minimized moving parts
• Low cross member

– Easy on/off

• Adjustable seat height
• Adjustable handlebar length

and tilt degree

• “Wheel Barrow” portability

Foot Straps Wrist Straps Wide Seat Safety Guards/Covers over moving parts and pinch points

Safety Concepts

“Cruiser” style handlebars

• relaxed wrists
• good riding posture

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

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