1.Group (1) Under supervision Professor Mostafa Helaly M.Sc Mostafa Yakout PE - 253 Theory of Machines Production Engineering Department Designing, Analyzing (motion and force) and Simulating using FEA 21 05 2014 1

2. Group(1) 2 3. Group(1) In This short presentation we will discuss the follwoing : Why choosing Two-Direction Mechanisum Introduction the Mechanisum The Design Process The Analysis Process Conclusion 3 4. Group(1) According to the latest studies by The World Economic Forum That top ten problems facing the world in the future are caused by 2 main problems And they are 4 Source : Global Risks 2014 report. USA Today 5. Group(1) 5 Source :CommuterBikeCenter.com 6. Group(1) 6 Knee Pain (from 40% to 60% ) Muscle Contraction (from 55% to 78%) Stress on anterior knee from pedaling (80%) Leg inflexibility Source : Peak Performance Sport UK 7. Group(1) 7 8. Group(1) The Two Direction Mechanism consists of four gears. Three of them are almost the same size and the forth is relatively small. The fourth gear is held on a curved slider 8 9. Group(1) Motion Type: Rotational for the main three gears. General motion (rotational and translation) for the small gear Material used: Aluminum Alloy 7075-S Function: The main function of the Two Direction Mechanism is to constrain the direction of output motion to one direction regardless the direction of the input rotational motion. 9 10. Group(1) First we will use Aluminum Alloy 7075 for gear manufacturing Pedal is made of aluminum and covered by Rubber or Plastic that is rigged Because the stresses on pedal is compressive fatigue stress so we need a material of high endurance limit and to make the bicycle more relax for the rider means has high strength to weight ratio and these properties found in Aluminum alloys 10 11. Group(1) 11 12. Group(1) 12 13. Group(1) 13 14. Group(1) 14 15. Group(1) 15 16. Group(1) 16 17. Group(1) 17 18. Group(1) 18 19. Group(1) We have input an average human pedaling speed which is 90 rpm So the output result in mechanism was about 200 rpm. 19 20. Group(1) The output average acceleration was about 1300 DEG/ 20 21. Group(1) We have used FEA (Finite Element Analysis Method ) (Finite Element Analysis) A mathematical technique for analyzing stress, which breaks down a physical structure into substructures called "finite elements." The finite elements and their interrelationships are converted into equation form and solved mathematically. Graphics-based FEA software can display the model on screen as it is being built and, after analysis, display the object's reactions under load conditions. Models created in popular CAD packages can often be accepted by FEA software (Ansys Workbench ) . 21 22. Group(1) 22 We used transit structure to analyze the design 23. Group(1) 23 (Von-Misses Yield Criteria ) 24. Group(1) 24 (Equlavalent Elastic Strain ) 25. Group(1) 25 (Total Deformation ) 26. Group(1) 26 We have send our design to a world wide clinic that is specialized in cycling injuries (Chester Knee Clinc) UK They were delighted by the design and will be in contact with us for further improvement in the design process of the product in terms of manufacturing and Design . Mr Vladimir Bobic Consultant Orthopaedic Knee Surgeon (Im really happy to find this type of thinking and enthusiasm in the youth of your country this is way more than college mini project .. You are more than a project good luck) 27. Group(1) 27