Dyson Fan Technology

GIFSoup

The Mechanics of the Air Multiplier

Calling the Dyson Air Multiplier a fan with no blades is perhaps a touch misleading. There are blades in the fan -- you just can't see them. The pedestal hides the blades. A motor rotates nine asymmetrically aligned blades to pull air into the device. According to Dyson, these blades can pull in up to 5.28 gallons (about 20 liters) of air per second.

The air flows through a channel in the pedestal up to the tube, which is hollow. The interior of the tube acts like a ramp. Air flows along the ramp, which curves around and ends in slits in the back of the fan. Then, the air flows along the surface of the inside of the tube and out toward the front of the fan. But how does the fan multiply the amount of air coming into the pedestal of the device?

Antifriction Bearing

The advent of automobile, high speed engines and automatic production machinery provided the impetus for extensive research and development of the rolling bearing (also called the antifriction bearing).

Advantage of rolling bearing compared to journal bearing.
1.Starting friction torque is low (not much greater than the running frictional torque).
2.Ease of lubrication either with prepacked grease or with relatively simple oil system.

3.Less axial space for a comparable shaft diameter.
4.Capable to supporting both radial and thrust bearing.
5.Early warning of impeding failure signalled by increasing noisiness at the same speed of rotation.

6.Readily replacable as stock item.
7.Standarization and the employment of close tolerances make preferable their use in the satisfactory operation of cams and gear.

8.Can be preloaded causing a shaft to become stiffer.
9.Can be used for mounting a shaft placed in any position in space.
10.Wide versatility with respect to mounting because they are supplied in special housings.

Vertical Pump

Liquefaction Process

Liquefied gases are widely used for a variety of purpose, for example as liquefied natural gas in cylinder as a source of domestic fuel in rural areas and as oxygen for rocket and for blast-furnace operation.

The essence of all liquefaction process is to cool the gas until it enters the two phase region. This cooling may be accomplished in several ways.
1. Cooling at constant pressure, as in a heat exchanger.
2. Cooling by expansion in an engine from which work is obtained.
3. Cooling by an expansion valve or throattling process.

The first method requires a heat sink at a lower temperature than that to which the gas to be cooled. An external refrigeration system is required if the gas temperature is to be reduced below normal surrounding temperature. Accordingly, the first method is normally used only as a means of precooling the gas.

The three method are illustrated in figure below this. The constan pressure path (1) approaches the two phase region (and liquefaction) most closely for a given drop in temperature. The isenthalpic expansion(3) will not result in liquefaction unless the initial state is at high enough pressure and low enough temperature for the constant enthalpy line to cut into two phase region.

Suspension

The suspension of the 2CV is legendary. Let's explain the specific characteristics in comparison to "normal" cars.

The most eye-caching fact is that the springs of the suspension are mounted horizontally. Additionally, the spring of the front and rear axis are placed in one housing.

(1) Spring pot
(2) Spring
(3) Rubber
(4) Tie rod
(5) Rocker
(6) Fastening spring tube

More information abaout Car Suspension, please visit http://mechanic-info.blogspot.com/2011/12/car-suspension.html

Submarine

­A submarine or a ship can float because the weight of water that it displaces is equal to the­ weight of the ship.

This displacement of water creates an upward force called the buoyant force and acts opposite to gravity, which would pull the ship down. Unlike a ship, a submarine can control its buoyancy, thus allowing it to sink and surface at will.

Steam Locomotive Walschaert Valve Gear

Cutoff, usually quoted as a percentage, is the point in the piston stroke at which the supply of steam to the cylinder is cut off by the closing of the valve. Maximum cutoff (typically 75%) is used for starting a train and is reduced by the operator as the train accelerates to speed.

Two Stroke Engine

In the two stroke engine the cycle is completed in two strokes, i.e. one revolution of the crankshaft as against two revolutions of four strokes.

The difference between two strokes and four strokes is in the method of filling the cylinder with the fresh charge and removing the burned gas from the cylinder. In the four stroke engine these operations are performed by the engine piston during the suction and exhaust stroke respectively.

Bridge Dynamic

From http://www.laporthistory.org/images/BadgerBridge/bridge-ani.html

Cosworth

The Fastest of Car in the world.

HRT car with Cosworth engine (usually for Formula 1 engine car) speed could be 320km/h. But now England with the Bloodhound SCC (some part use Cosworth engine) will be used for target speed 1600km/h next 2012. It would be the fastest of car in the world. The car will be ride by Andy Green whom handed of world record present.

The Cosworth engine task is pumping 1.5 Ton fuel for 23 second to supply of rocket fuel and power supply for throw air break by parasut, total power need 700 bhp.

Whatever hard the task, Cosworth believe to their engine performance could helps Bloodhound SSC for the speed target 1680 km/h.

Atkinson cycle for Hybrid Car

In Otto cycle expansion ratio can not be greater than compression ratio. This inherent in the operation of the simple reciprocating engine. The gases at end of otto cycle’s isentropic expansion, how ever could do more work if they were allowed to continue isentropic expansion to the lowest cycle pressure.

When the modification is done, the cycle becomes Atkinson cycle (expansion ratio is greater than compression ratio).

















The Atkinson cycle features a compression stroke that is shorter than the power stroke, achieved by leaving the intake valve open longer.

This effectively allows the gases to expand more than they are compressed and thus the gas does more work per stroke than in the Otto Cycle.

By getting more work out of a given amount of gas, the efficiency of the engine is improved.

Buckeye Coupler

By far the most common coupler seen around the world is known variously as the "Knuckle", "Buckeye" or "Janney" coupler, animation above.

This is an automatic, mechanical coupler of a design originating in the US and commonly used in other countries for both freight and passenger vehicles.

It is standard on UK hauled passenger vehicles and on the more modern freight wagons. The term "Buckeye" comes from the nickname of the US state of Ohio "the Buckeye state" and the Ohio Brass Co. which originally marketed the coupler.

Drought Control

This animation attempts to show the following sequence:-

1. the control lever is pushed down.
2. the lift arms fall, until the drag on the plough creates enough pressure on the top link to compress the spring, which then pushes the control fork pivot point forward.
3. The valve is then closed, and further descent of the lift arms is prevented.
4. The plough continues at this depth, until further resistance is met by the plough the control fork pivot point is pushed forward.
5. oil is pumped to the ram, lifting the lift arms.

The animation doesn't show the effect of a reduction in drag: that would let the top link, and the control fork, move back, allowing oil to be drained from the ram again.

Internal Incompressible Fluid Flow

The first law of thermodynamic is a statement of conservation of energy. The energy different of the heat added to the system and work result from the same system is same as the value of energy change.

In the other words can we say the energy can not be created or destroyer, that's only can be transferred from one to another.

From the control volume of the first low of thermodynamic can be found the Bernoulli equation. The large of Bernoulli equation can we see as below...

Basic Fluid Flow

Basic knowledge about fluid flow is important to understand how to calculate about flow,level and pressure meter. Many people get misunderstand about compressible and incompressible flow for the example.

So lets think the basic fluid flow to solve power plant trouble or try to re-design it.

Das Boot

The battle of Atlantic in world word II was, the German sub-marine U-Boats destroyed more than a thousand ships and they potential to disturb US - England logistic.

Winston Churchill said if we can handle the U-Boat, we can win the war but it was not easy.

U-Boat have secret code communication between each other of U-Boat, that machine called Enigma, something like type writer.

Finally by found a new technology of radar and snatched of Enigma, the U-bolt changes status from hunter become hunting.

Locomotive

Prior to locomotives, the motive force for railroads had been generated by various lower-technology methods such as human power, horse power, gravity or stationary engines that drove cable systems.

The first successful locomotives were built by Cornish inventor Richard Trevithick. In 1804 his unnamed steam locomotive hauled a train along the tramway of the Penydarren ironworks, near Merthyr Tydfil in Wales.

Although the locomotive hauled a train of 10 tons of iron and 70 passengers in five wagons over nine miles (14 km), it was too heavy for the cast iron rails used at the time. The locomotive only ran three trips before it was abandoned. Trevithick built a series of locomotives after the Penydarren experiment, including one which ran at a colliery in Tyneside in northern England, where it was seen by the young George Stephenson.

The Oldest Car "Alive"

He was Marquis Albert De Dion who does genius and as a pioneer in many automotive industrial. He understood the potential development of gasoline engine.

Before era of internal combustion engine, together with George Bouton he created steam engine in 1882, and to increase performance of engine work, they created shaft back system. In 1890 they created gasoline engine and continuo to created car with three wheels.

Back in 1884, De Dion and bouton created a steam power car which can take 4 passenger, two in front and two others in behind. All control of car is by hand.

©AutoExpert Magazine

The Last Gasoline Standing

The world of automotive era now is coming from internal combustion engine (ICE) model. Those machine consist two choices, diesel engine and gasoline engine and the gasoline consist two types, two strokes and four stroke.

In their expansion the four stroke defeat two stroke cause by emission gas. But in four strokes engine also has problem of mechanical & process loss. That is only 40% remain power to turn the wheel.

Totally there are six loss of four strokes engines,
1. Compression Ratio loss.
The compression ratio can not be increase due to tendency to knocking caused by the rapid increase temperature of combustion chamber.