Basic Utility Vehicle (BUV)

ME 462 Capstone Design PresentationDepartment of Mechanical Engineering,

IUPUIDecember 14, 2005

Presented by:Tom PetersKris Miller

David Langenderfer

Design Introduction Design a 3 wheeled vehicle made from

a small truck rear end and frame. Design a rear ambulance unit to be

attached to the chassis. Used in 3rd world countries and can be

manufactured one per day. Main focus is cost with emphasis on the

drive train, ease of assembly, durability, and serviceability.

Customers

Impoverished people of developing countries.

EMT personnel

Customer Requirements

Cost $1350 for pre-welded kit Does not include assembly, freight,

and duties. $300 Ambulance cost

Customer Requirements Transmission

Forward & Reverse Top speed <20 mph on grass

Payload 1200 lbs including driver

Steering System Turn Diameter <20 ft + 50° from centerline

Customer Requirements Seating

Driver seat on centerline If passenger seat is included it must be on

centerline. Power-plant

8.5-10 HP internal combustion engine Throttle mounted on steering mechanism

Brake System Foot activated truck brakes Parking brake Independent left and right

Customer Requirements

Chassis Small truck frame Ground clearance >10.5 inches

except at differential Skid plates <11 ft or <12 ft if using motorcycle

seating arrangement

Customer Requirements

Suspension Front & Rear

Front has a min. of 3 inches of travel Rear uses truck suspension

Auxiliary Systems V-Belt Power Take Off (PTO) V-Belt Driven Water-pump

Customer Requirements Electrical System

12 V DC Safety Equipment

Standard safety equipment Example: roll protection, horn, lights, seat belts,

etc… Size

Minimize crate size for front end Assembly Time

< 6 man hours to assemble front kit and assemble to rear unit. Does not include cargo bed.

Customer Requirements Ambulance

Passenger Capacity 3 recumbent patients or 2 patients and 1 attendant

Equipment IV hooks, stretchers, attendant seat, bench/storage, sun & rain

protection, lights, work table, shelf, back-gate and fender Storage

Cold storage, plastic bin storage, in-floor storage, outside storage, fuel and water storage.

Electrical System 12V DC

Miscellaneous Impermeable Surfaces resistant to environment 2 sq ft Clean surface area Size 6x4 ft Weight <160 lbs

Project Boundaries & Objectives

Boundaries Cost Size Performance/durability

Objective Low cost transportation / ambulance

Design

Design Specification Development Weighting of Customer Requirements Engineering Requirements Engineering targets

Competitive Benchmarks

Fall 2003 IUPUI BUV John Deere Gator

John Deere Gator Better

Sales Stopping Ability

Same Top speed, horse power, parking brake

Worse Cost Payload Ground clearance No ambulance capability No PTO or water-pump

Fall 2003 IUPUI BUV Better

Stopping Ability Cost Overall weight Center of gravity

Same Top speed, horse power, parking brake, turning radius

Worse Payload Ground clearance No ambulance capability No PTO or water-pump Various optional equipment

Functional Decomposition

Concept 1

Concept 2

Concept 3

Failure Modes

Front End Concept 1 Concept 2 Concept 3 Flat tire Flat tire Flat tire Broken Axle Fracture in the lug Fracture in the lug Worn bearing Worn bearing Worn bearing Broken weld on joints Broken weld on joints Broken weld on joints Fracture at pivot point Fracture at pivot point Fracture at pivot point Broken Shock Broken Shock Broken Shock Leak Oil Leak Oil Leak Oil Shock locks Shock locks Shock locks Broken shock mount Broken shock mount Broken shock mount Unbalanced tire Unbalanced tire Unbalanced tire Unbalanced steering system

Unbalanced steering system

Unbalanced steering system

Sliding forks lock

Critical Parameters

Steering Angle Suspension Travel Weight Capacity Clearance

Concept Evaluation

Absolute Comparison Go/No go All a go

Relative Comparison Decision Matrix

Decision Matrix

Conclusion

Concept 3 Best Overall Concept Durable Low Cost Easy to Manufacture Reasonable in Size

Project Plan

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Engineering Specifications

Design Concepts

Concept Evaluation

Proposal

Solid Model of Prototype

Evaluate Prototype

Complete Report/Presentation

Present solid model of prototype

Schedule Task 1: Generate Engineering Specifications (9/1 – 9/9) Task 2: Design concepts of vehicle components (9/9 –

9/23) Task 3: Concept Evaluation (9/23 – 9/30) Task 4: Proposal Due Date (10/1 – 10/10) Task 5: Solid Model of Prototype based on best concept

(10/10 – 11/10) Task 6: Evaluate prototype and shake down the

prototype (11/10 – 11/25) Task 7: Complete final report, presentation and poster

(11/25- 12/7) Task 8: Present the final design (12/12)