Biomechanical energy harvesting Chat GPT" Biomechanical energy harvesting is a technology that captures and converts mechanical energy generated by the movement of the human body or other living organisms into

electrical energy. This harvested energy can then be used to power electronic devices or recharge batteries. The concept behind biomechanical energy harvesting is to make use of the energy that is typically wasted during activities like walking, running, or other physical motions. There are various methods and devices used for biomechanical energy harvesting, including: Piezoelectric Materials: Piezoelectric materials can generate electrical voltage when subjected to mechanical stress or deformation. In biomechanical energy harvesting, piezoelectric materials are often incorporated into wearable devices, such as shoes or clothing, to capture energy from movements like walking or bending. ● Electromagnetic Generators: These devices use the relative motion between a magnet and a coil to generate electrical energy. For example, when a magnet within a wearable device moves in response to body motion, it induces a current in a coil, producing electricity. Triboelectric Generators: Triboelectric generators take advantage of the friction between two materials to generate electrical charge. In biomechanical energy harvesting, this technology can be used in wearables to capture energy from the contact and separation of materials during motion. ● ME 302 Machine Design II 231 ● Microbial Fuel Cells: In some cases, researchers have explored using microbial fuel cells to harvest energy from biological processes. These cells use bacteria to convert organic matter into electrical energy. Energy-Scavenging Nanogenerators: Nanogenerators are extremely small devices that can convert mechanical energy into electricity. They can be integrated into various wearable technologies to harvest energy from body movements. Biomechanical energy harvesting has the potential to power small, low-energy electronic devices, such as fitness trackers, medical sensors, and other wearables. It can also be useful in remote or off-grid settings where conventional power sources are limited. However, the amount of energy that can be harvested from human body motion is relatively small, and the efficiency of these energy-harvesting systems is a key challenge. Researchers continue to work on improving the efficiency and practicality of biomechanical energy harvesting technologies to make them more viable for a wider range of applications." Problem Statement As an engineer you have been asked to redesign and identify parts needed to build an arm exercising Machine (see figure 1 a and b), this includes the selection of bearings, springs, gears, locking rings, rods, bolts etc. (off shelf). To know more about the machine, details on the designed system can be found in this link. The main objective is generating electricity while exercising. Improvement required: the design relies on multiple gears and DC generators (refer to Fig. 1 below), you are asked to design a simulate a mechanism that will allow the use of 1 DC generator, where it can continuously run in one direction through both motions downward and upward. Projects ME 302 Machine Design II 231 Pulling Rod Guidelines Guide Rod Engaged Gear Rack Figure 1: Arm exercising machine with power generator Ne a. Shafts b. Bearings, bearing mounting C. Gears, gears mounting d. Springs, springs mounts e. Rods, and linear bearings f. Generators evon Projects Hand Rest Team is formulated of maximum three members. Formal report should be submitted with all calculations Each member should indicate his contribution in the project The project is due end of week 14 Spring Deliverables 1. New mechanism design and simulation to provide continuous rotation in one direction to run the DC generator 2. Off shelf selection (should provide source and price) of all necessary part for reconstructing the design (bill of materials). Disengaged gear DC Generator 3. Re production of CAD drawings- dimensions can be found by visiting the GYM at KFUPM and identify the range of seat height and width to make exercising convenient and safe.