FACULTY

APPLIED TECHNOLOGIES

DEPARTMENT

AIRCRAFT TECHNOLOGY ENGINEERING

LEVEL OF STUDIES

UNDERGRADUATE

MODULE CODE

AE3110

SEMESTER OF STUDIES

^5th

COURSE TITLE

MACHINE ELEMENTS

INDEPENDENT TEACHING ACTIVITIES

TEACHING HOURS PER WEEK

CREDIT UNITS

Lectures 

3

4

Practice

1

0

                                                                                                   Laboratory

2

                    3

COURSE TYPE

Specialty course

PRE-REQUIRED COURSES:

TEACHING AND EXAMINATION LANGUAGE

GREEK

THE COURSE IS OFFERED TO ERASMUS STUDETNS 

COURSE WEBSITE (URL)

Learning Objectives

After successfully completing the course, students should be able to:

·                  Identify the machine elements found in aircraft parts

·                  Calculate the mechanical stress of machine elements comprising aircraft mechanisms

·                  Select the appropriate machine elements for the prototype design of aircraft mechanisms

General Skills

Search, analysis and combination of data and information with the use of the necessary technologies

Adjustment to new conditions 

Decision making

Development of free, creative, critical thinking

Working in an international environment 

Working in an interdisciplinary environment 

Production of new research ideas

Unit 1: Basic knowledge on material strength
Stress, strain.  Modulus of elasticity, yield point, shear point. Basic testing for determining the material mechanical properties (tension, compresssion, torsion, hardness measurement, fatique). Hook's generalized law. Yield criteria.

Unit 2: Rivets and rivetings – tolerances and joints
Stress and riveting calculation. Aircraft riveting. Types of rivets and methods of applications. Common rivets. Rivet definition and selection. Riveting elements definition. Common rivet installation. Special rivets. Friction securement headed rivets. Mechanical securement headed rivets. Dowel type rivets. Rivnuts. Deutsch Rivets. Εxplosive rivets. 

Unit 3: Βolts and screws
Screw stress calculation. Standardization and specifications. Bolt and screw characteristics. Thread. Bolts. Codification and identification. General use bolts. Hole head bolts.  Small tolerance bolts. Internal clamp bolts. External clamp bolt. Special bolts. Dowel screw. Eye screws. Self-restraint bolts. Self-locking bolts. Aluminum bolts. Jo type bolts.  Safety screws. Nuts. Non self-locking nuts.  Self-locking nuts.  Metallic self-locking nuts. All metal self-locking nuts. Non metal self-locking nuts. Gang channel self-locking nut.  Codification and identification. Bolt and nut installation. Bolt and hole size. Bolt installation techniques. Bolt and nut clamp. Screws. Structural screws. Simple screws. Self-tapping screws. Codification and identification. Half-turn screws. Dzus half-turn screws. Calmot half-turn screws. Airloc half-turn screws.

Unit 4: Αxles and shafts
Shaft description and types. Calculation of axles and shafts under dynamic stress. Dowels. Stress concenration in notches.

Unit 5: Rolling and sliding bearings
Bearing types and codification. Ball bearing calculation. Characteristic types of bearings used in aircraft (radial bearing, axial bearing, single ball, double ball, tubby bearing, needle bearing). Shaft beearing assembly and disassembly procedure. 

Unit 6: Joints and brakes
Fixed and movable joints. Clutches. Standardization, clutch types and characteristics. Hydraulic clutches. Clutch slide and maintenance.

Unit 7: Wire ropes
 Cable flight control systems. Wire ropes. Basic cable FCS elements. Cable inspection. Cable intensity control. Cable  intensity measurement. Pul-Push Rod Flight Control Systems. Torque rod FCS. FCS Motion transmission mechanisms. 

Unit 8: Belts – chains – springs
Belt drive characteristics. Pulleys and belts. Belt stress. Belt width calculation. Belt types and codification. Instructions for belt operation. Belt drive with Jockey wheel tensioner.  Trapezoidal belt drive. Common chain drive. Chain element calculation. Chain types and codification. Spring construction method. Spring characteristics. Spring types and codification. Spring calculation. Spring uses in aircraft. 

Unit 9: Gear wheels I
Gearwheel characteristic sizes. Basic law of gearing. Joint sizes. Orbital Joint construction. Gear types. Cycloid gears. Gear tooth shaping – rolling conditions. Tooth damage. Gear wheel treatment. Types of treatment. Cutting machines. Rolling machines. 

Unit 10: Gear wheels II
Parallel teeth gear wheels (spur gears). Aircraft construction applications. Forces produced. Main elements selection. Gear quality selection. Shear and surface pressure calculation. Transmission gear ratios selection. Reduction gear performance. Bearing force calculation. Inclined teeth gears. Basic types and uses.

Unit 1: Gear wheels ΙΙΙ
Conical wheel gears. Basic forms and uses. Straight teeth conical wheel gears. Gear forces. Gear tooth shear calculation. Conical gears with inclined teeth. Characterisitcs, forces, main characteristics selection, performance calculation. Worm gear wheel. Basic forms and uses. Characteristics. Performance. Forces. Main features selection. Surface pressure and shear calculation. Bending control on worm gear axle. Bearing force calculation. 

Unit 12: Tubes and glands
Distribution lines. Material and tube identification. Metal tubes. Τube formation. Tube cutting. Tube bending. Stretching. Tube swelling. Τube assembly. Metal tube installation. Tube Damage, Repair and Replacement. Flexible tubes. Flexible tube types. Identification. Characteristics. Tube adjusters. Tube fittings. Quick disconnect tube fittings. Flexible joints. Elastic tube failure. Elastic tube construction. Elastic tube leak control. Εlastic tubbing installation.

1^st Lab Activity: screw tensioning
Students should recognize the basic experimental steps of determining the screw strength under tension. 

2^nd Lab Activity: Shaft stress calculation
Students should analyse step by step the tasks that must be executed for the calculation of geometric and mechanical characteristics of a rotating shaft that is subject to dynamic alternating load.

3^rd Lab Activity: Determination of slide bearing friction coefficient
Students should analyse step by step the tasks that must be executed for the calculation of the shaft slide friction coefficient.

4^th Lab Activity: Rotating mass balancing
Students should analyse step by step the tasks that must be executed for the rotating mass balancing.

5^th Lab Activity: Clutch friction developent
Students should analyse step by step the tasks that must be executed for the calculation of the friction coefficient in a simple clutch.

6η Εργαστ. Άσκηση: Μετάδοση κίνησης με ιμάντα
Οι φοιτητές θα πρέπει να αναλύουν βήμα προς βήμα τους χειρισμούς που πρέπει να εκτελέσουν για τον προσδιορισμό των χαρακτηριστικών μετάδοσης της κίνησης με ιμάντα.

7^th Lab Activity: Measurement of the reduction gear efficiency coefficient
Students should analyse step by step the tasks that must be executed for the calculation of a single reduction gear coefficient.

8^th Lab Activity: Torsional oscillations
Students should analyse step by step the tasks that must be executed for the calculation of the shaft torsional oscillations.

9^th Lab Activity: Ball bearing assembly and disassembly
Students should analyse step by step the tasks that must be executed for assembling and disassembling a shaft ball bearing .

10^th Lab Activity: Introduction to calculation of machine elements with software.
Students should describe the instructional operation of machine elements calculation using relevant software.

11^th Lab Activity: Gear calculation with special software
Students should analyse step by step the tasks that must be executed for the calculation of the characteristic gear wheels with software assistance.

ΤEACHING METHOD

Face to face

USE OF INFORMATION AND COMMUNICATION TECHNOLOGIES  

 Potential use of asynchronous tele education

TEACHING ORGANIZATION

STUDENT EVALUATION

Problem solving,

Lab work,

Writen assignment

Α. Μπαλντούκας, Σημειώσεις και ασκήσεις στα στοιχεία μηχανών, Έκδοση 2015.

« Στοιχεία Μηχανών « τομ.1 Γ. Αυγερινού Εκδόσεις Φούντας , 1998.

Mechanical Engineering Design, Ch. R. Mischke, J. Edward Shigley, McGraw-Hill, 7th edition, 2004.

Fundamentals of Machine Elements, B. J. Hamrock, B. Jacobson, S. R. Scmid, Mcgraw-Hill, 1999

«Στοιχεία Μηχανών» τομ.1 G. Niemann Μετάφραση Γ. Αυγερινού Εκδόσεις Πλαίσιο - Φούντας , 1998

Fundamentals of machine component design (2000, 3rd Edition), By Robert C. Juvinall, Kurt M. Marshek, Publisher: John Wiley & Sons; ISBN: 0-471-24448-1

Engineering design methods: Strategies for product design (1995, 2nd Edition), By Nigel Cross, Publisher: John Wiley & Sons; ISBN: 0-471-94228-6

Mechanical design of machine elements and machines (2003), By Jack A. Collins, Publisher: John Wiley & Sons; ISBN: 0-471-03307-3

Machine Elements in Mechanical Design (3rd Edition), by Robert L. Mott, Publisher: Prentice Hall; ISBN: 0138414467; 3rd edition (November 13, 1998)

Mechanical Engineering Design, by Charles R. Mischke, Joseph Edward Shigley, Publisher: McGraw-Hill Higher Education; ISBN: 0073659398; 6th edition (October 25, 2000)