bicycle technology, human powered machine

general machines, Simple Comments Off
Mar 112011

today the bicycle technology has the same development with motorcycle. including aerodynamics and construction. There are different types of bikes, but all are basically similar, although the components differ in quality, design and weight, as well as the speed and mode of use. In order of importance, a bicycle comprises the following components:

Schematic Diagram of a bicycle.

- Table: The most common is in the form of diamond, also called double diamond or triangle. The classics were made of iron or steel, today, when chromium-molybdenum steel is called Cro-Moly “or” chromoly “. They can also be aluminum or titanium, or carbon fiber and other materials.
- Fork: part formed by the head tube that holds the front wheel hub, it can be fixed or suspension.
- Wheels: After the box, the wheels are the most important element to the performance of the bike.
- Transmission: Includes external gearshift type switches (derailleur) front and rear and internal changes in the hub of the rear wheel, both operated by paddle shifters.
- Shifter: Changing gear changers include fist and thumb shifters among others.
Pedal.
- Brakes: Includes brake lever and brake systems.
Power: The power (or steerer) is the set of bicycle components that provide an interface between the front fork and head tube of the table between them.
- Handlebars: Handlebars vary between a width of 52.5 to 60 cm (21 to 24 inches), the widths allow control at low speeds while the strong are better for high speeds, the Straits are also suitable in the city to drain between cars. A type of handle is called “whale tail.” It differs from others in that it lacks the free ends that characterize the traditional handlebar.
- Saddle : From the saddles on the market, some are thinner and lighter to reduce weight while anatomical models are designed for comfort.
- Seat: stem is called the saddle support tube.

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Posted by at 8:57 am

A simple machine

Simple Comments Off
Dec 272010
The old but always efficient pulley

A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. A simple machine uses a single applied force to do work against a single load force. Ignoring friction losses, the work done on the load is equal to the work done by the applied force. They can be used to increase the amount of the output force, at the cost of a proportional decrease in the distance moved by the load. The ratio of the output to the input force is called the mechanical advantage. Usually the term refers to the six classical simple machines which were defined by Renaissance scientists:

- Lever – Wheel and axle – Pulley – Inclined plane –Wedge -Screw

They are the elementary “building blocks” of which all more complicated machines (sometimes called “compound machines” to emphasize that they are combinations of the simpler building blocks) are composed. For example, wheels, levers, and pulleys are all used in the mechanism of a bicycle. Simple machines fall into two classes; those dependent on the vector resolution of forces (inclined plane, wedge, screw) and those in which there is an equilibrium of torques (lever, pulley, wheel).

Although each machine works differently, the way they function is similar mathematically. In each machine, a force  is applied to the device at one point, and it does work moving a load,  at another point. Although some machines only change the direction of the force, such as a stationary pulley, most machines multiply (or divide) the magnitude of the force by a factor, the mechanical advantage, that can be calculated from the machine’s geometry. For example, the mechanical advantage of a lever is equal to the ratio of its lever arms.

Posted by at 4:04 am

history of machine

Aerofoil, Clock machine, Compressors & Pumps, Electronics machine, general machines, Heat, Linkages, Simple, Turbine Comments Off
Dec 262010
An animated demonstration of the unique Wankel...

A machine is a device that uses energy to perform some activity. In common usage, the meaning is that of a device having parts that perform or assist in performing any type of work. A simple machine is a device that transforms the direction or magnitude of a force. . Historically, a device required moving parts to be classified as a machine; however, the advent of electronics technology has led to the development of devices without moving parts that many refer to as machines—the computer being the most obvious example.

“Engines” are machines that convert heat or other forms of energy into mechanical energy. For example, in an internal combustion engine the expansion of gases caused by the heat from an exothermic chemical reaction results in a force being applied to a movable component, such as a piston or turbine blade. An engine is often considered part of a larger machine, such as an automobile or an aircraft.

Machines are ubiquitous in a wide variety of industrial, commercial, residential and transportation applications. Those employing hydraulics are especially useful in manufacturing and construction.

Posted by at 12:29 pm
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