Present Design (human Genertor Device)

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Arrangement of the physical elements to carry out its required function. Relationship among the component in the product and the function the product performs. For the example is defining the building blocks of the product in term of what they do and interface.

Power transmission machines use either chains, gears or belts. Usually, chain is an economical part of power transmission machines for low speeds and large loads.

From the table above it shown we choose the chain because it have more benefit than other. Futhermore it suitable with our sprocket. Generally, under the same transmission conditions, the cost of toothed belts and pulleys is much higher than the cost of chains and sprockets. See the following features and points of notice about roller chain transmission. Features of Chain Drives: Speed reduction/increase of up to seven to one can be easily accommodated. Chain can accommodate long shaft-center distances (less than 4 m), and is more versatile. It is possible to use chain with multiple shafts or drives with both sides of the chain. Standardization of chains under the American National Standards Institute (ANSI), the International Standardization Organization (ISO), and the Japanese Industrial Standards (JIS) allow ease of selection. It is easy to cut and connect chains. The sprocket diameter for a chain system may be smaller than a belt pulley, while transmitting the same torque. Sprockets are subject to less wear than gears because sprockets distribute the loading over their many teeth. Points of Notice: Chain has a speed variation, called chordal action, which is caused by the polygonal effect of the sprockets. Chain needs lubrication. Chain wears and elongates. Chain is weak when subjected to loads from the side. It needs proper alignment.

Sprocket are used in our project to transmit rotary motion between two shafts where gears are unsuitable or to impart linear motion to a track.

A pedal is the part of our project component that the user pushes with his or her foot to propel the gear and motor. It provides the connection between the user's foot on shoe and the crank allowing the leg to turn the bottom bracket axle. Pedals usually consist of a spindle that threads into the end of the crank and a body, on which the foot rests or is attached, that is free to rotate on bearings with respect to the spindle.

Since we are not expert in electric, but we have doing research and surveying through internet and we found that below is the motor that commonly used to generate electric. We chose a Permanent magnet DC motor for the following reasons: 1. Easy to control 2. Ability to function as a generator and regenerate power 3. Good torque-Speed relationships 4. High-power – weight ratio 5. Past experience through Control Theory 6. Ease of motor characterization (solving for torque constant, back-emf constant, voltage-speed constant)

Given the time constraint and the complexity of the other system components, a permanent magnet motor was ideal for our application. It would deliver adequate torque and rotate at a sufficient speed given several levels of gear reduction to improve the existing system Another factor leading to our selecting a permanent magnet motor was its relative low costs compared to brushless motors, and the ease with which it could be integrated into the system.

For our system we decided to purchase a 15Amp-Hr battery. The costs does not increase dramatically as the Amp-Hr Capacity increases, however, the size of the batteries does. The B&B HR15-12 batteries would fit the scale of the system just as well as some of the smaller capacity batteries, which is why we selected it over some of the higher capacity batteries whose physical size increased beyond the system’s scale.

Human factor is a term used to describe the abilities, limitations and other physiological or behavioral characteristics of human that effect the design and operation of tools, machine etc. There are a few type of factor that we are consider in the our project: •Physical size limitation •Static human physical characteristics •Hand and foot operated control devices

Physical size limitation Anthropometry is the science that measures the range of body sizes in a population. When designing products it is important to remember that people come in many sizes and shapes. Thats human factor are discuss by our group must consider when to design human power generator to make sure the human device that can genarate electricity will safe which can avoid hazard to user and pleasure to the user, in the other word is user friendly.

Common condition environment posture measurements.

Example of result that we refer when design our product. That shown us the range of human posture measurement.

The table above used in to get the distance between seat and pedal. Pedals operated with the whole leg can produce maximum force for the short durations but accuracy is extremely low. High pedal pressures are the best achieved with angles of the knee around 135ᵒ and by supplying back rest.

Assembly is the process of putting together all the product’s components before display. The individual components manufactured have to be assembled into a product. Assembly is an important phase of the overall manufacturing operation and requires consideration of the ease, speed, and cost of putting part together. Methodologies and computer software are available for DFA, utilizing 3-D conceptual design and solid models. Permanent-attachment methods include welding, brazing, soldering etc. Temporary-attachment methods include threaded fasteners such as screws, nuts and bolts etc.

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FUNDAMENTAL: The fusion of the joint between two part (melting and coalescing material by means of heat) The consumable bare wire is fed automatically through a nozzle into the weld arc by a wire-feed drive motor.

This is the most popular welding process capable to produce a great variety of welds. Simple, portable and inexpensive equipment; Wide variety of metals, welding positions and electrodes are applicable; Suitable for outdoor applications.

This method is a comprehensive approach to production of goods and it integrates the design process with materials, manufacturing method, process planning, assembly, testing, and quality assurance.

In Injection molding, thermoplastic pellets are melted and then injected under high pressure into a metal mold.

FUNDAMENTAL:

 Heated cylinder to promote melting  The granules/fellet are fed into the heated cylinder  The melt is forced into a split-die chamber by rotating screw system  Rotating screw move backward under pressure  The screw then stops rotating and push forward and forcing molten plastic to mold cavity  Process is repeated automatically ADVANTAGES:

 Can achieve complex shapes and good dimensional accuracy

This process are to produce the seat paddle in our device. But we just get the already existing part. That because it will take time to produce a new part and required higher cost.

Machining involves removing material from the workpiece by a sharp cutting tool that shears away chips of material to create a desired form or features. Machining is a subtractive process that produces manufactured waste. There are a few machining process inlcude: milling (involves removal of material from the flat surface by a rotating cutter tool). drilling (is removing material using a rotating bit to form a cylindrical form. sawing (involves removing material with a toothed blade)

Drilling is the process of using a drill to produce cylindrical holes in solid materials, such as wood or metal. Different tools and methods are used for drilling depending on the type of material, the size of the hole, the number of holes, and the time to complete the operation We choose this method because we need to drill in the internal frame to locate the shaft and to put the bolt and nut. This method is suitable to our process to produce the product and the machine we can use in the our workshop.