tailieunhanh - Thiết kế máy bay_Chương I

Tài liệu hướng dẫn kỹ thuật thiết kế máy bay dành cho sinh viên ngành Cơ khí - chế tạo máy tham khảo học tập. Tài liệu hay và bổ ích, . | AIRPLANE DESIGN PART I PRELIMINARY SIZING OF AIRPLANES by Dr. Jan Roskam Ackers Distinguished Professor of Aerospace Engineering The University of Kansas Lawrence Kansas NO PART OF THIS BOOK MAY BE REPRODUCED WITHOUT PERMISSION FROM THE AUTHOR Copyright Roskam Aviation and Engineering Corporation Rt4 Box 274 Ottawa Kansas 66067 Tel. 913-2421624 First Printing 1985 TABLE OF CONTENTS s ss 95 s 5 5 ĨS s EE 8 S TABLE OF SYMBOLS V ACKNOWLEDGEMENT ỈX 1. INTRODUCTION 1 2. ESTIMATING TAKE-OFF GROSS WEIGHT WTQ EMPTY WEIGHT w AND MISSION FUEL WEIGHT w 5 j B GENERAL OUTLINE OF THE METHOD 5 DETERMINATION OF MISSION PAYLOAD WEIGHT WpL AND CREW WEIGHT Wcrew 8 GUESSING A LIKELY VALUE OF TAKE-OFF WEIGHT WT0 8 guess DETERMINATION OF MISSION FUEL WEIGHT W- 9 FINDING THE ALLOWABLE VALUE FOR wp 17 i THREE EXAMPLE APPLICATIONS 49 Example 1 Twin Engine Propeller Driven Airplane 49 Example 2 Jet Transport 54 Example 3 Fighter 60 SENSITIVITY STUDIES AND GROWTH FACTORS 68 An Analytical Method For Computing Take-off Weight Sensitivities 68 Sensitivity of Take-off Weight to Payload Weight 70 Example 1 Twin engine propeller driven airplane 70 Example 2 Jet transport 71 Example 3 Fighter 72 Sensitivity of Take-off Weight to Empty Weight 72 Example 1 Twin engine propeller driven airplane 72 Example 2 Jet transport 73 Example 3 Fighter 73 Sensitivity of Take-off Weight to Range Endurance Speed Specific Fuel Consumption Propeller Efficiency and Lift-to-Drag Ratio 74 Part I Contents Page