TOPS MEKINEMATICS AND DYNAM ROTAT MA
TOPS MEKINEMATICS AND DYNAM ROTAT MA ME 380
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This 17 page Class Notes was uploaded by Vidal Goyette on Friday October 23, 2015. The Class Notes belongs to ME 380 at University of Kentucky taught by Raymond Lebeau in Fall. Since its upload, it has received 26 views. For similar materials see /class/228233/me-380-university-of-kentucky in Mechanical Engineering at University of Kentucky.
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Date Created: 10/23/15
Who Designed This Product Design Same Mission Different Designs Sam Mission Different Designs Air Vehicle Aft AC Attach Fitting and Space Vehicle Parachute Holder Af l Segment Space Vehicle Fwd Segment Air Vehicle Select a Point of Departure Design Trade Studies Life cycle emphaSIS Manulaciunng Supporxabliny Multidisciplinary Design Optimization MDO to couple disciplines for optimization and to reduce time Aerospace systems design emphasis Tum inlo we process Illquot Figs Concurrent engineering approach in the life cycle and in design AIAA Technical Committee on MDO 1991 Trade Studies Trade studies are systematic examinations of factors affecting the performance of different designs It typically compares competing parameters to find an optimal design trading one performance parameter for another Trade studies are a signature systems engineering tool Types of trade studies gtgt Controlled convergence gtgt Constraint analysis equation based gtgt Costperformance gtgt Risk reductiorIreliabiligx gtgt Comprehensive All of these come before a detailed physics based sizing and performance analysis Types of Trade Studies Controlled Convergence Preliminary Method Used by Engineering Quick Method to Compare Primitive Design Variables Constraint Analysis Equation Based Optimization Cost Effectiveness Links Force Structure Implications to Top Level Requirements Analysis Risk Reduction Examines the pay off of technology performance versus risk of failure Comprehensive Considers all Applicable Decision Criteria Controlled Convergence Steps J Dean EMIS 7303 Example Controlled Convergence Method Design Alternatives Comparison 1 2 3 4 5 riteria Baseline Design Primatives ThrustNVeight TM 8 S rWeightNVing Ref Area WIS S Coef of Li S Cruise Performance Speci cyfuel S S S consum lion ran e s ee observables Shaping materials propulsion etc Payload C pacity S s A ility maneuverability amp S controllabillty TOTAL 39S 0 1 5 2 4 1 1 1 1 4 2 Note lack of numbers StrengthsNVeaknesses of Controlled Convergence Constraint Analysis Sizing approach from Nicolai what is the EW A erfuel and payload is there enough Ie over to build a plane Equ ations wEmplyAw l Wm W M r W M4 40m IK um r J l 39 E I r 39 WEmyly r Relation 39om 34an KY benchmark data r 39 SmugSnludulv 3m f 39 30m l 39L 39 mama lb payload 2m 7 Him cc 1 cf g 4 W 55m 7010 15m xnm39 win your 95 m mew Mason Constraint Analysis Approach due to Loftin look for optimum values based on competing equations NASA RP 1060 1980 3 Thrust loading TOW ng loading wgs Example Using Loftin s method minus 2nd segment climb gradient 1 ws lb0F Cost Effectiveness Maximize performanceoost ratio aka costbenefit analysis Look for bends in the curve regions where most impact is made Where sthe Increase Pe ormmce with Mi n m al In a ease in Performance cm Decrease Casi with Minimal Decrement to Pe ormmoe quotbiggest hang for the buckquot I Cost Knee in the Curve Manama Level Rewinznals Mannim Emmi 15mm soimmn mac a 5mm mum zurmu 25000 30000 ma Cost Effectiveness Alternative Con guration Scoring Methods When schedule and risk are relatively unimportant in relation to effectiveness and cost ratio effectiveness over cost lt gt to Life Cycle Cost Targets Killed Targets Kiiled over Time ower Time When cost and schedule risks are significant consider the change in reward effectiveness 39 Effectiveness toCost Ratio Life Cycle Cost d quot quotH M e s Cont 1 Effectiveness Opportunity Eileg gi ness it gt to lt gt 39 quot mocLhigh risk loWrisk 39 Cont 2 7 Cont 1 Mission Analysrs Provrdes Results for AlretoAir Combat Effectiveness a Defensive Counter Air Presence 39x Loiter N 5 Intensity 5 Beyond Visual Within Visual R Iange Combat Ft lange Combat Sensors Maneuver 39 X Kggsn ger N 1 Weapons ConventionalPostStall quot 1 Signature wax 1 Weapons l Countermeasures 1 4 Signature I Countermeasures 39 Total Loss Sortie Rate Number of Number Total Rate 4aT0LD Dist Aircraft in of Days X Sorties N l LossesQVB f Turnaround the Fleet quot Takeoffs Losses WVR Time Break Rate 1 Force Structure f Repalrnme A Mlssmn AnaIySIs Prowdes Results for Total Kins AirtoGround Combat Effectiveness 39 g Kills KS Sorties 52 e yload I quot6 Over 39 V v KH Target Acqulsmon Attack Conversron Weapon Effects 2 o 1 2 3 39 S rtsie N E Target X Sensors M ensors X Number of Days 2 Ks 0 l Cueing A l Cueing V Weapons h Ref Dr John Kitowski AIAA Aerospace Design Conference Feb 3992 TMR Laezggyn f Number of X Loss Per In ress Encounters Encounter S b N 439 Observables r V39 Observables 7 X urvwa my l Masking I l Hardening PS W ESS Avoidance l Maneuver I Standoff A l Countermeasures Total Loss Sortie Rate Number of Number Total Rare 1 TOLD Dist Aircraftin39 of Days X Sorties N x ingress l Turnaround the Fleet i v Takeoffs 1 Terminal Time 1 costs 1 I Egress 1 Break Rate 1 Force Struct39 re 1 RepairTime 39 Total Kills KillsKs PSI v Sorties E 75 O o 1 3 4 5 7 Days Ref Dr John Kitowski AIAA Aerospace Design Conference Feb 92 Life Cycle Cost Coonsition PLUS PLUS PLUS PLUS Management Tech Data WM RDRE operano w Hardware PubiIcatIoI I Sparea FacIiIty Support Software St n H ContractorSeNIce Construction inciudeS WW 5 p DWI Eqmpme t PostrProduca Aiiowance for Cha ge TraInIng EqqumenI Ion Support A I FactoryTraInIng DISposai OST PROCUREMENT COST PROGRAM ACQUISITION COST LIFE CYCLE COST swam P Primary S Secondary Cost Estimating Methods During Acquisition Phases Relative Values Based on N Aircraft 030 DemoValidation 0L59 Tooling ampEngineering 174 Replenish Sppt Eqpt 212 Air Vehicle 3152 Airframe 1072 Fuel 013 Engine 883 Engine 092 Base Level Maint 022 Offensive Avionics 231 Offensive Avionics 1155 Depot Maint 070 Launcher 218 Launcher 370 UpdatingMods 002 Training 017 Training 078 Replenish Spares 006 Special Support Eqpt 194 Special Support Eqpt 006 Vehicular Eqpt 047 Test amp Evaluation 036 Test amp Evaluation 1261 Mlitary Personnel 015 Project Management 007 Project Management 046 Civilian Personnel 013 Data 015 Data 129 Support Personnel 152 Initial Spares 223 Pipeline Costs Comprehensive Trade Study Sample Configuration Decision Categories Threat Acquisition Av ordanc e Hit Avoidable Given Acquisition S ortie Surviv al Given Hit Target Acquisition T arget Kill Given Acquisition Kills per Sortie Targets Killed Over Time F lyaway Weapon System Procurem ent Program Acquisition Life Cycle T echnical Cost S chedule Produc ibility Supportability Managem ent Utility Functions Preference Indicators Utility Functions Provide a Good Technique for Translating Diverse Criteria Into a Common Scale ie Range inNautical Miles Mean Time Between Failures in Hours etc Utility Scores Range From 0 to 1 With 0 Being Least Preferred and 1 Being Most Preferred Determining the Shape of Utility Functions Critical Risk Prj39one39 N pn C r it i39c afl Ris kgAveralge Configuration Preferences Sensitivity Analysis Design Interlude 3 Aircraft Layout Purpose to let others know where everything in the vehicle is how the vehicle is constructed and more importantly that you have thoughtfully considered both Concept Sketches Suitable forthe introduction point of departure Component Placement AFT r Simple sketches can be used for placing of components weight buildups layout etc note that 2D views are limited sense of size and placement are restricted to a single plane Stlll Camera PORT board HAM f 12V Batteries an j 3 m TNC n v 1 cell Opt J Servo Ban Piccolo ARM board Video Timing CII CUIl for CameraS still camera iPod Echute Sam STARBOARD CAD Allows detailed exploded views of aircraft design elements particularly structural and sub systems Examples Examples