MP4011_Presentation (Group 4)

8/3/2019 MP4011_Presentation (Group 4)

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Wong Chu Bang

Heng Cher Guan Daniel

Tan Sia Nguan Eugene

Ang Ming Hui Louis



Scope of Presentation1. Introduction

Problem Description

Objective

Design Constraints Design Requirements

Idea Generation

2. Conceptual Design Functional Analysis Diagram

Morphological Chart

Concept Screening (A, B, C)

Concept Evaluation



Scope of Presentation3. Detailed Design

Working Principle

Detailed Calculation

4. Embodiment of design 3 Rules

4 Principles

Material Selection

5. Cost Analysis Part Explosion Diagram



IntroductionProblem Description

Unable to play basketball due to heavy rain

Unable to enjoy a safe game in heavy thunderstorm

Objective

Design an all-weather system to be installed atan existing basketball court



IntroductionDesign Constraints

1. Able to protect user from all weather

2. Able to install to existing basketball courts3. Safe to operate

4. Must be mounted outside the basketball playingpremises

5. Aesthetics



Site Survey

Bukit Batok

Serangoon

Marine Parade



Market Survey100 basketball court users and residents

Results:



Design Requirements1. Aesthetic

2. Corrosive Resistant (weatherproof)

3. Durable

4. Low Maintenance (modular)

5. Provide Shelter Quickly

6. Strong Structure (able to withstand extreme

conditions)7. Simple Mechanism

8. User Friendly

9. Safety



Exploration of Ideas



Exploration of Ideas



Conceptual Design



Functional Analysis Diagram

User InputMove

ShelterShelterfully-

extended

ActivateShelter

ActivateMechanismCheck whetherShelter fully-

extended

Material

Energy

Signal

ShelterMove

Shelterfully-retracted

Shelterretract

ActivateMechanismCheck whetherShelter fully-

retracted

ActivateMechanismCat I Signal



Morphological Chart

Activate

Shelter

Move

Shelter

Shelter

Fully

Extended



Patents & Research Retractable roof - Patent 4204372

Umbrella-type tent apparatus - Patent 6230728

Hand Winch – Patent 7793919 Electric Motor/Servo – Patent D576941

Hydraulic Motor – Patent 6345501

Pneumatic Motor – Patent 4407390

http://www.freepatentsonline.com/4204372.html

http://www.patentstorm.us/patents/6230728/claims.html


http://www.freepatentsonline.com/D576941.html





http://www.freepatentsonline.com/D576941.html






Patents & Research Rack and Pinion – Patent 4218933

Linear Guide – Patent 7632017

Chain Motor Drive – Patent 7080825 Double Pulley – Patent 1800664

Limit Switch – Patent 7129429

Latch Mechanism – Patent 7656663

Proximity Sensor – Patent 6798217

http://www.wikipatents.com/US-Patent-4218933/rack-and-pinion-gear-assembly




http://www.wikipatents.com/US-Patent-7129429/limit-switch/


http://www.patentstorm.us/patents/6798217.html

http://www.patentstorm.us/patents/6798217.html


http://www.wikipatents.com/US-Patent-7129429/limit-switch/




http://www.wikipatents.com/US-Patent-4218933/rack-and-pinion-gear-assembly



Concept Screening



Concept A

Activate

Shelter

Move

Shelter

Shelter

Fully

Extended



Concept A: The SeashellThe Seashell1) Activate : Servo

2) Move: Double Pulley (in Slot Rail)

3) Sense Extension:Proximity Sensor



Concept A : The Seashell1. Activate : Servo Precision required due to Curvy shape

Easy to Manipulate Positions

Expensive, Difficult to Programme

2. Move: Double Pulley (in Slot Rail) Cheap & Easy to Manipulate motion


Corrugated tubing required to protect Slot Rail

3. Sense Extension: Proximity Sensor Easy to link up with Electrical Systems above

Longer Sensing Range

Cheap, Consistent detection



Concept B

Activate

Shelter

Move

Shelter

Shelter

Fully

Extended



Concept B : The DomeThe Dome1) Activate :

Hand Winch (

9 (Mechanical)

2) Move:Rack & Pinion

3) Sense Extension:

“Catch” Mechanism



Concept B : The Dome1. Activate : Hand Winch (Mechanical) Energy Saving Fixed systematic actuation Prevent Backlash Motion

Take long time to fully extend shelter Tiring for User

2. Move: Rack & Pinion Simple & Cheap

May face functional issues due to obstacles on Rack Fixed systematic actuation

3. Sense Extension: “Catch” Mechanism Energy Saving

Prevent Backlash Motion



Concept C

Activate

Shelter

Move

Shelter

Shelter

Fully

Extended



Concept C: Flying Wings

Flying Wings1) Activate :

Centrifugal Pump(Hydraulics)

2) Move: Chain Drive

3) Sense Extension:Roller Limit Switch



Concept C : Flying Wings1. Activate : Centrifugal Pump (Hydraulics)

Able to Manipulate Heavy Structures

Prevent Backlash Motion

Expensive, High Maintenance required

2. Move: Chain Drive Prevent Backlash Motion

Able to Efficiently Move Heavy Loading

Possibility of Chain slippage

3. Sense Extension: Roller Limit Switch Easy to link up with Electrical Systems above

More accurate that Level Limit Switch



Concept EvaluationCriteria WeightFactor

Concept A Concept B Concept C

Values W.V Values W.V Values W.V

Aesthetics0.22 4 0.88 3 0.66 5 1.1

Durability 0.07 4 0.28 4 0.28 3 0.21

LowMaintenance

0.11 3 0.33 5 0.55 2 0.22

Provide ShelterQuickly

0.12 4 0.48 3 0.36 4 0.48

Strong Structure0.08 3 0.24 4 0.32 4 0.32

Simplicity of

Mechanism

0.05 3 0.15 5 0.25 2 0.1

User Friendly 0.15 4 0.6 3 0.45 3 0.45

Safety 0.2 4 0.8 4 0.8 3 0.6

Sum of Weighted

Value 1 3.76 3.67 3.48



Modifications to Selected Design1. Activate : Brushless DC Motor

Precision required due to Curvy shape


Regenerative Function, Easy to Programme

Expensive

2. Move: Double Pulley (in Slot Rail) Cheap & Easy to Manipulate motion


Corrugated tubing required to protect Slot Rail

3. Sense Extension: Proximity Sensor Easy to link up with Electrical Systems above

Longer Sensing Range

Cheap, Consistent detection

Addition of Fans & Lights



Final Design – “Closed”



“Closed” Views



Final Design – “Deployed”



“Deployed” Views



Detailed Design



Working Principle (1/3)









Detailed Calculations1. Main Structure Stress Deflection

2. Brushless DC Motor Speed Power Consumption

3. Fan Rate of Cooling, Speed, Flow rate Length of Fan Blades

4. Lightings Luminance





X Y

Main Structure (2/5)

RA

RB

Centroid X = 9.13 m Y = 2.97 m

7m RA

RB

W = 100N/m

21.5m

W = 100N/m = 2150N

Removed “y” subscript & Assume W = 100 N/m




X Y

W = 100N/m = 2150N

RA

RB



-7249 Nm

6494 Nm

913N 1237N

-913N


.

Free Body Diagram

Shear Force Diagram

Bending Moment Diagram

W = 2150N

913N 1237N

5.25 m 7.94 m



Main Structure (5/5)Bending Moment Equation

Cross Section Area of Beam

Assume mass = 1 kg of material

Select Material with



Singapore’s Record Wind Speed

On April 1984, a small-scale event which produced very high gust speed of 40.1 m/s at Tengah

Note: 40.1m/s = 144.36km/hr





Forces of Wind Note: 40.1m/s = 144.36km/hr

= 89.7 mph

For 90 mph



Brushless DC Motor (1/3)



Brushless DC Motor (2/3)



Brushless DC Motor (3/3) Aluminium Alloy 6061: Supporting Poles

Density: 2700kg/m³

Diameter: 0.0254m Weight= πr2 l ρ

= 205.2kg

Polyester Canopy 300g/m2

Total Area: 577m2

Weight = 173.1 kg

Total weight of canopy and supporting poles: 378.3kg

3 x Supporting Poles

(Note: Weight used for Motor Selection)



Fan Selection

There would be 124190.5 ft 3 of static air within the Basketball Court

In the scenario that the air is turned over 1 times in 1 hour

Basketball Court will require 124190.5 ft 3 of air

Hence, 2 fans of 1000 CFM or 4 fans of 500 CFM will be required



Lighting Calculation (1/4)

Lighting Requirement for Basketball Court= 50 footcandles (fc)



Lighting Calculation (2/4)

Assume:

Lamp Lumen Depreciation (compact fluorescent) = 0.85

Ballast Factor = 0.95

Luminaire Dirt Depreciation = 0.85

Lighting Requirement for Basketball Court = 50 footcandles ( fc)



Lighting Calculation (3/4)To Find Coefficient of Utilisation, Room Cavity Ratio must be found (Assume Room is a Cuboid)

Coefficient of Utilisation Table

Assume that the surface reflectances:

Pfc, floor = 20%

PCC, ceiling = 10%Pw, wall = 10%RCR = 3 (round down)

Coefficient of Utilisation = 0.48



Lighting Calculation (4/4)Lighting Requirement for Basketball Court = 50 footcandles ( fc)

Average Maintained Illumination = 50 fcCoefficient of Utilisation = 0.48

Light Loss Factor = 0.686 Area of ½ of Shelter = 363 m 2 = 3907 ft 2

Hence, 10 light blubs of 60000 lumens or 20 light blubs of 30000 lumens



Embodiment of Design



3 Rules

Clarity Simplicity

Safety

4 Principles Force Transmission

Division of Tasks

Self-Help

Stability/Instability



3 Rules1. Clarity Any ambiguity in the design must be eliminated

No unintended functions

Simple words to indicate clearly the function of buttons onthe controller for activation of shelter

Arrows to indicate direction of motion shelter

2. Simplicity Design as simple as possible

Unnecessary complicated steps are eliminated



3. Safety Adequate strength, reliability and accident prevention

measures are to be ensured

Signs to warn users of the danger zone when shelter isoperating

When shelter mechanism fails, warning signals and alarm

will be activated

Proximity sensor to detect obstacle at the track

3 Rules



4 Principles1. Force Transmission

Reducing of stress concentration at sharp corners

Curvature of the main supporting structures

No sharp turning points on the track

2. Division of Tasks Dissimilar functions are to be performed by different parts

In the case of two or more parts performing the same function, work should be separated equally to each part

4 Aluminium Alloy poles are used to support the canopy

Improves clarity as tasks do not interfere with one another



4 Principles

3. Self-Help Symmetrical shelter from both sides balance each

other.

4. Stability/Instability

As canvas is spread over entire basketball court, Al Alloy Poles are used to support the canvas sheet to

prevent drooping of canvas



Cost Estimation



Cost Estimation

To fully estimate the cost of a product, the following steps areneeded:

1. Have a set of detailed drawings of all components;

2. Create a Part Explosion Diagram (PED) and list out the items;

3. Come up with a sketch routine for self-manufactured items; (willbe done in later part of project)

4. Obtain the prices of raw materials and commercial items, thenthe overall selling price of design

Material Selection



Material SelectionMaterial A Material B Material C

1. Steel Track

Galvanised Steel Track Steel Track Steel Track

2. Stainless Steel Wire

SS Wire Rope 304 -6x19 Class

Bright Wire RopeEIPS FC - 6x19 Class

Galvanized Wire RopeEIPS IWRC -6x37 Class

7. Canvas Sheet 100% Polyester 100% Polyester 100% Acrylic

8. Canopy

Supporting Pole

FibreGlass Rods Al Alloy Rods 4130 Alloy Structural

Steel Bar

11. Steel FrameStructure

4130 Alloy StructuralSteel Bar

Structural Steel Bar 4340 alloy structuralsteel

Properties

Corrosion resistance, highdurability, light weight, goodheat insulation, good surfacefinish

High corrosion resistance ,flexibility and resistance to wear-and-tear, high strengthto weight ratio

Waterproof, Tear-Resistant with excellent tensilestrength, Flame Retardantand lightweight

good mechanical properties,

good weldability, suitable forgeneral purpose use

high strength, hightoughness, high temperaturestrength with good workability, good weldability

http://www.alibaba.com/product-gs/402084200/pvc_canopies_fabric.html

http://www.alibaba.com/product-gs/325519683/300D_sliver_coated_oxford_fabric_waterproof.html

http://www.alibaba.com/product-gs/378977744/Metal_track.html

http://www.alibaba.com/product-gs/365034553/track_frame.html

http://www.alibaba.com/product-gs/287761653/steel_track.html



Part Explosion Diagram

Steel Frame structure

11



1 M

1 M

Main structure

M

Drive System

2 P

6 P

Steel Track

4 P

Canvas sheet

4 P

Stainless Steel

Wire

1P

Electrical Wire Drum

1

10

7

3

413

12

4

Shelter

Assembly

Steel Wire clip

12 P

5

1 M

Cable

Assembly

6

6 P

Canopy Supporting Pole

8

6 P

Steel Track Rollers

2

2 P

9

Ventilation Fan

10 P14

Lightings

Li f M k /P h f Sh l



List of Make/Purchase parts for Shelter systemItem

nunberDescription Make or Purchase

1 Steel Track P

2 Steel Track Rollers P

3 Stainless Steel Wire P

4 Electric Wire Drum P

5 Steel Wire Clip P

6 Cable Assembly M

7 Canvas Sheet P

8 Canopy Supporting Pole P

9 Ventilation Fan P

10 Main Structure M

11 Steel Frame Structure P

12 Shelter Assembly M

13 Drive System M

14 Lightings P



Cost CentreItem

nunber Description

Unit

Cost($/unit)

Quantity

Per

Assembly(units)

Cost

Per

Assembly($/order)

Order

Cost($)

1 Steel Track 1.30 2.60 338 338

2 Steel Track Rollers 2.50 6 15 15

3Stainless Steel Wire

(6x19, 7/16”)per inch0.2 7874.02 1,574.8 1,574.8

4 Electric Wire Drum 1,500 4 6,000 6,000

5 Steel Wire Clip 10.77 12 129.24 129.24

7 Canvas Sheet (m2 ) 1.97 1218 2,399.46 2,399.46

8 Canopy Supporting Pole(feet) 5.18 88 455.84 455.84

9 Ventilation Fan 290 2 580 580

11 Steel Frame Structure (ton) 2000 98.95 197,902 197,902

14Lightings

Metal Halide M47 Light Bulb44.95 10 444.95 444.95

Total (based on order of 1 unit) 209, 839



Documents

MP4011_Presentation (Group 4)