Central Washington University ScholarWorks@CWU All Undergraduate Projects Undergraduate Student Projects Spring 2020 Mechanical Footstep power generator Mohammed Saleh Aljohani Central Washington University, mohammed.edu Faisal Alonazi Central Washington University, faisal.edu Follow this and additional works at: https://digitalcommons.edu/undergradproj Part of the Computer-Aided Engineering and Design Commons, Engineering Mechanics Commons, Manufacturing Commons, and the Mechanics of Materials Commons Recommended Citation Aljohani, Mohammed Saleh and Alonazi, Faisal, "Mechanical Footstep power generator" (2020). All Undergraduate Projects.edu/undergradproj/145 This Dissertation/Thesis is brought to you for free and open access by the Undergraduate Student Projects at ScholarWorks@CWU. It has been accepted for inclusion in All Undergraduate Projects by an authorized administrator of ScholarWorks@CWU. For more information, please contact scholarworks@cwu.
MECHANICAL FOOTSTEPS POWER GENERATOR By Investigator: Mohammed Aljohani Project Partners: Faisal Alonazi TABLE OF CONTENTS Mechanical Footsteps Power Generator. Scope of Effort:. Approach: Proposed Solution:. Description of Analyses:.
Scope of Testing and Evaluation:. Test Procedure description:. Part Suppliers, Substantive Costs, Sequence or Buying Issues:. Determine Labor & Estimate Costs:.
Estimate Total Project Costs:. In fall quarter:. In winter quarter:. In Spring quarter:.
Project risk analysis. 26 A1: The maximum permissible torque for the shaft with known diminution:. 26 A2: One force on the beam:. 27 A3: Two forces on the beam:.
28 A4: The weight of top plate:. 29 A5: the weight of Base Plate:. 31 A7: Left / Right Side Support. 32 A8: Shear stress and strain for punch hole to Top plate and Base plate.
34 A10: Shear force and bending moment Diagram. 35 A11: Spring Constant and compressed. 36 A12: Volume of a box for the device. Appendix C – Parts List.
Appendix J – Job Hazard. MOTIVATION: This project was motivated by the need for a device that would generate electricity from human motion, especially footsteps. Electricity is a very important resource in people daily life. There are numerous sources from which are able to generate electrical energy.
The major sources of energy include but are not limited to coal, natural gas, petroleum, and nuclear energy. Most of these sources have adverse effects on the environmental inclusion such as air pollution; for example, from coal energy generation plants which then cumulatively leads to effects such as increase in rates of global warming. This project seeks to establish an environmentally friendly way of generating electric power from human motion. Such a system could be highly effective for installation in places that expect frequent mobility of a large population such as in educational institutions like universities and subway station entrances and platforms.
FUNCTION STATEMENT: The function of this statement is to generate electrical power from human motion. REQUIREMENTS: 1) This device is required to have the ability and capacity to store the energy generated 6kw/h. 2) The device should be able to support the weight of an average human being which is approximately 137 pounds. 3) Once activated the top plate of the device must return to the initial position with displacement not lasting more than 5 seconds.
4) The displacement must be compensated appropriately to prevent overshoot in the device. It must be 1 inch. 5) The device should measure 50 centimeters in length, 35 centimeters wide and a thickness of 25 centimeters. SUCCESS CRITERIA: 1) The project must meet all the requisite safety criteria.
2) The device developed should also be relatively small and lightweight without compromising its functionality. 3) The device should be manufacturable with ease. 4) Its construction materials need to be easily accessible and inexpensive so as to minimize the cost of production per unit. 5) To be able to generate optimum functionality of the device must be installed in areas where there is a large population density.
SCOPE OF EFFORT: The project will only seek to harness the energy generated by the impact of the foot on the floor during the gait cycle. APPROACH: PROPOSED SOLUTION: The solid works design and dimensions are represented in Appendix B, and analyses are presented in Appendix A. The analysis contains only the structure, and the design will be performed efficiently when all the dimensions, loads and requirements are met completely. DESIGN DESCRIPTION: The design for whole device comes with top plate, base plate, 3 gears, 1 rack with pinion, rod supports, left/right side support and generator.
6 Scanned with CamScanner A1) Design (Sketch for top plate and base plate with springs). BENCHMARK: Wind turbines are one of the sources of green energy as depend on wind currents to turn the turbines and generate electricity and also inexpensive to maintain since propulsion is natural. Similarly, the device is seek to develop would have zero negative impact on the environment and would be inexpensive to maintain since it depends on human moment to produce electricity, also; not be affected by shifts in weather patterns; unlike wind turbines whose productivity solely depends on the natural wind direction. This new device would be fully dependent on human motion which is entirely under people control to operate.
PERFORMANCE PREDICTION: The performance of the project will be as described below: 1) The footstep power generator electricity provided by human motion. 7 2) The displacement must be compensated appropriately to prevent overshoot in the device. It must be 1 inch. 3) Once activated the top plate of the device must return to the initial position with displacement not lasting more than 5 seconds.
DESCRIPTION OF ANALYSES: • A1: Finding the maximum permissible torque for a shaft of known dimensions, trying to calculate the max. Permissible for the shaft and knowing the whole dimensions can use for shaft. • A2: Measuring one force on the beam to try how the average human weight 137 lb. will be on the device.
• A3: Measuring the two forces on the beam for human motion, just example if two humans’ motion be on the steel beam how will be good for steel and nothing will happen for the steel such as broken. • A4: trying to get exact measure for top plate that will work in device, and if trying to make it bigger can change the volume to higher to be good. • A5: trying to get exact measure for base plate that will work in device, and if trying to make it bigger can change the volume to higher to be good. But in the base plate the length should be bigger than the top plate.
• A6: L-bracket measure it and want to know how can bending the bracket by 90 degree to get the exact measure and be work in device to hold the Rod Support with base plate. • A7: Measuring the Left/right side support to know how can support the load for one force on the top side support. • A8: Measuring the punch hole for top plate and base plate, Shear stress and strain for punch hole to Top plate and Base plate and avoid the extra space. • A9: calculating the shear stress for top plate that help the device to know how and will be good for human.
• A10: Calculating the shear force and bending moment Diagram to know if the steel of top plate will be bending for 137 lb. for human motion or not. • A11: Calculating the Spring’s constant and how far the stretched or compressed and using the Hooke’s Law to measure constant and compressed. • A12: Box measuring, trying to measure how can making a box for the device to be in good condition and how can use size for the box.
SCOPE OF TESTING AND EVALUATION: 8 Mechanical testing includes testing each parts of the machine/robot individually followed by the complete testing after which the project is ready to be used. METHOD: The complete diagram of the power generation using footsteps. L-shapes window is inclined in certain small angle which is used to generate the power. The pushing power is converted into electrical energy by proper driving arrangement.
The rack & pinion, spring arrangement is fixed at the footsteps which are mounded bellow the L- shapes window. The spring is used to return the inclined L-shapes window in same position by releasing the load. The pinion shaft is connected to the supporter by end bearings. The larger sprocket also coupled with the pinion shaft, so that it is running the same speed of pinion.
The larger sprocket is coupled to the small cycle sprocket with the help of chain cycle. This larger sprocket is used to transfer the rotation force to the smaller sprocket. The smaller sprocket is running same direction for the forward and reverse direction of rotational movement of the larger sprocket. This action locks like a cycle pedaling action.
• Method of construction: One of the major factors that determined the nature of the generation system was environmental issues. constructing a device that generated power while conserving the environment was the most critical factor that motivated the idea of coming up with this generation system. The system is designed in a way that the people movement will be utilized to generate electricity. The footstep power generator basically translates the oscillatory motion to circular and later to electricity.
The construction of the system includes measurement, manual cutting, drilling and welding. 9 • Manufacturing issues: Most of the material purchased did not conform to the measurement of the parts of the generator. Getting materials with similar measurements was impossible. In addition, some materials are not locally available.
The last problem is the cost of the material. For instance, the price of steel is relatively high. • Methods used in to solve the problem: In order to get the correct measurement, measurement and manual cutting of the materials were done. Where the screws were needed, drilling was done to ensure that the bolts were fitted correctly.
Other methods used in connecting different parts include welding. Welding was done were permanent attachment was needed. To ensure that enough time to make the cutting and measurement was available; all the materials were ordered in time. FOOTSTEP ARRANGEMENT: This is made up of mild steel.
The complete set up is fixed in this model footstep. The two L- shapes frame is fixed in the above two ends of the track. Bellow this L-shapes window, the actual power generation arrangement is constructed. DRAWING TREE Mechanical Footsteps power generator Stracture Gear Generator Top Plate Supporting Plate Rod Support L-Barcket Base Plate Shaft Spring 4.
INTRODUCTION: Footstep power generator is a project with three major parts; structural, gearing, and generating power. In this proposal the focus major will be on structural. Testing the functionality of the generator is important. In order to ensure that the generator setup is fully functional, various tests are done on the materials.
Also, after the system is assembled, various tests will be carried to find the efficiency of the generation system and the possibilities of the system breakdown. The tests done before assembling include; verification of the materials purchased, the measurement 11 verification, and verification that the materials ordered were supplied as instructed. After assembling the following will be tested: the power of the generator, the efficiency, reliability of the system and probability of breakdown after installation. METHOD/APPROACH: ▪ Performance testing: This test involves a process of finding out the responsiveness and stability of the footstep power generation system.
The test will provide information regarding the production capacity of the generator. This approach will test the average power the power generation system can produce at different environmental aspects. ▪ Usability testing: This method of test determines the easiness of using generation system. The system should be easy to use.
Different users will be requested to use the generator while being observes. Qualitative data will be collected for the analysis ▪ Security testing: Security test will be carried to determine if there are any risk involved when operation the footsteps power generation system. TEST PROCEDURE DESCRIPTION: To verify if the materials are supplied are as ordered a procedural check is done.