POWER STEERING

POWER STEERING:

Power steering assists the driver of an automobile in steering by directing a portion of the vehicle’s power to traverse the axis of one or more of the road wheels. As vehicles have become heavier and switched to front wheel drive, particularly using negative offset geometry, along with increases in tire width and diameter, the effort needed to turn the steering wheel manually has increased often to the point where major physical exertion is required. To alleviate this, auto makers have developed power steering systems: or more correctly power-assisted steering on road going vehicles there has to be a mechanical linkage as a fail safe. There are two types of power steering systems hydraulic and electric/electronic.

Degree of Freedom

Degree of Freedom :-

The degree of freedom can be defined as the minimum number of independent coordinates which can specify the position of the system completely.
There are total 6 degree of freedom.
Among them 3 are Transnational, 3 are rotational.
The degree of freedom of a body decreases by applying constrains for the body.

W engines - what does the W stand for?

W engines - what does the W stand for?
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With the aim of building even more compact units with a large number of cylinders, the design features of the V and VR engines were combined to produce the W engines.
As with the V engines, the cylinders are distributed to two banks. In the W8 and W12 engines, these banks of cylinders are aligned at a V-angle of 72° in relation to one another. As in the VR engine, the cylinders within each bank maintain an angle of 15°.

When the W engine is viewed from the front, the cylinder arrangement looks like a double-V. Put the two Vs of the right and left cylinder banks together, and you get a W. This is how the name "W engine" came about.

VALVE TIMING DIAGRAM

VALVE TIMING DIAGRAM :-

The above diagram is for a Caterpillar series 3600 turbo charged after cooled engine. As can be seen from the timing diagram, the induction stroke commences when the inlet valve opens 10° before TDC when air is drawn into the cylinder as the piston moves down. The inlet valve closes 1° before BDC.

The air is now trapped in the cylinder and as the piston rises on the compression stroke, the air is compressed. As the air is compressed, it rises in temperature. When the piston reaches 19° before TDC, the injection of fuel commences and continues until 73° after TDC.

The heat in the compressed air ignites the fuel and combustion takes place. The gases expand forcing the piston down on the power stroke.

The exhaust valves opens at 26° before BDC and the exhaust gases commence and are discharged as the piston rises on the exhaust stroke. Most of the exhaust gases have been discharged as the piston nears TDC. However, at 10° before TDC, the inlet valve opens and air enters the cylinder and helps discharge any remaining exhaust gases until the exhaust valve closes at 3° after TDC.

The whole cycle is then repeated.

Both the exhaust valve and inlet valve are open from 10° before TDC to 3° after TDC, an overlap of 13°. This is referred to as “valve overlap” and ensures that all the exhaust gases are discharged from the cylinder and the cylinder receives a fresh charge of air to make it more efficient when combustion next takes place.

Therefore there is one power stroke for every cycle or two revolutions of the crankshaft.

Funny Facts About Engineers: [A MUST READ]

Funny Facts About Engineers: [A MUST READ]

1. For engineers every course apart from engineering is easy.
2. An engineer has the power of getting up at 9.25 am and reaching the class at 9.30 am.
3. T-shirt and jeans are engineer's national dress and Maggi is the national food.
4. A normal person will fix the broken things but an engineer will first break a thing and then he would fix it.
5. An engineer can build a car, spaceship and they even can make time machine. However, he just can’t build a relationship with a girl.
6. An engineer doesn't care for the rise in price of petrol or gold but he gets mad when cigarette costs Rs.5.50 instead of 5.20.

P.S: Add your own facts and tag your friends who can relate to this.

Glowplug indicator light

In older generation diesel-engine vehicles, unlike in a gasoline-engine vehicle, the operator did not simply turn the key to the "start" position and have the engine immediately start. Instead, the operator turned the key to the "on" position for a long duration; the glowplug relay switches the glowplugs on, and a light (see picture at right) on the instrument cluster illuminates. This process is called "pre-heating" or "glowing". According to Bosch: "Older engines used a glow period of up to 21 seconds whereas more modern engines use around a 6 to 8 second heat period and provide after glow at a reduced voltage"

The Bugatti Veyron

The Bugatti Veyron is well known for being one of the most expensive and fastest cars, but what you probably didn't know is that it takes a special key to allow the car to reach it's top speeds.
Once turned, the top speed key causes the car to lower it's rear spoiler and suspension to allow for even better aerodynamics and greater speed.

Japanese Engineers Launch The World’s Fastest Passenger Train

Japanese Engineers Launch The World’s Fastest Passenger Train

The most recent maglev train in Japan is known as the LO Series and can run at speeds of up to 311mph (500 km/h). In its first run along the 26.6-miles test track, the train reached its top speed before it touched the 3-mile marker.

Why can't we use petrol in diesel engine?

Why can't we use petrol in diesel engine?

Petrol has a lower ignition temperature and is more inflammable than diesel.The compression ratio in diesel engine is very much higher than petrol engine, so if petrol is used in diesel engine there will be lot of knocking( the phat phat sound like that of Enfield)
and chances are the engine ll be greatly damaged and there is a chance of fire hazard resulting in personal injury.

Its just like eating grass instead of rice.
Of course you can eat but, at once you won't feel anything and day by day you will face problems related to stomach, digestion, etc.
Like this, if you use petrol instead of diesel, the vehicle will work but it will stuck and trouble at the middle.

vernier caliper

It is a vernier caliper,these are the instrument used to calculate the length and thickness of small materials like glass,wood and other mechanical components.

Mind-Blowing Car Cutaway

Mind-Blowing Car Cutaway.

A popular trend at car shows and launch events is to show a cutaway, revealing the intricate details and mechanics of these beautiful machines. By stripping away parts of the exterior and coverings, viewers can get up close to appreciate the sophistication and engineering of today’s automobile.

Engines

1- Ferrari v12 engine
2-veneno v12 engine
3-McLaren v8 engine

International color coding for Pipe lines

International color coding for Pipe lines

OIL = Golden Brown
Water = Green
Gas = Yellow
Steam = Silver
Compressed Air = SKY BLUE
NITROGEN GAS - FRENCH GRAY / YELLOW HSD ( DIESEL ) - DARK BLUE
FRESH WATER - GREEN
CHILLING WATER - BUS GREEN
BLOCK FOR - OXYGEN
COOKING GAS - POSTAL RED

AutoCAD

AutoCAD is a computer-aided design (CAD) program used for 2-D and 3-D design and drafting. AutoCAD is developed and marketed by Autodesk Inc. and was one of the initial CAD programs that could be executed on personal computers.

This Rocket Powered Bicycle Can Do 280 Km/Hr:

This Rocket Powered Bicycle Can Do 280 Km/Hr:

How it worked:

Concentrated liquid hydrogen peroxide (H2O2)—about 90-percent concentrate, compared to the 3-percent stuff sold in drug stores—is fed from a storage tank into secondary chamber filled with a catalyst, typically silver. This causes the chemical bonds to break down and the hydrogen peroxide to decompose into heat, water (H2O) in the form of 650 degree F steam, and oxygen (O). The steam is then forced through a rocket nozzle to provide thrust.

The ride was so rough that the rear axle was significantly loosened, but the bicycle still managed to reached it’s amazing top speed. The attempt has yet to be certified, but there is little reason for it to be rejected.

MECHANICAL ENGINEERING!!! We like it dirty.

MECHANICAL ENGINEERING!!!

We like it dirty.

                                     

What does a Mechanical Engineer do?

What does a Mechanical Engineer do?

All our household appliances, ventilation systems, bikes, cars, ships and airplanes have been designed, tested and manufactured by Mechanical Engineers. Mechanical Engineers create Robots for Industrial or Commercial usage Mechanical Engineers also construct large & high strength structures Mechanical Engineers uses CAD/CAM (Computer Aided Design/ Manufacturing)
systems to design & manufacture the products.

PROUD TO BE A MECHANICAL ENGINEER

Axial vector engine 12 cylinder concept 26500cc/1618ci in SolidWorks

 Cylinders =12 (6 both sides)
Bore Dia = 80mm
Stroke length = 110mm
Engine Type = Axial Vector Type 4 Stroke
Crank Mechanism = CAM Disk Mechanism
Engine Capacity = 26500cc/1618ci

A swashplate is rigidly fixed to the CAMDisk, and goes round with it as a unit. Therefore the connecting rods are not fixed to the plate in any way, but push on it with rollers or slipper pads that can glide over the surface of the plate as it turns. The main point of attraction is the use of CAM-Disk in place of Crank shaft to provide reciprocation. Since the Engine is double Reciprocatory with corresponding strokes at both sides, there is no unbalancing of masses i.e. full balanced. Battery Ignition System is used with a spark plug for each cylinder. There are one inlet and one exhaust for each cylinder. Fins thickness is not calculated but 5mm is more than enough. Fuel Type used is Gasoline and the engine can found application in Aerospace as well as Automotive. Engine is mainly a torque converter type rather than speeder.

                                               

Biomimicry Creates New Tires that can't go flat!!!!

Biomimicry is the science that imitates nature to create new products.Resilient Technologies, a Wisconsin based company, has created a tire that can't go flat. Instead of using a pressurized aircavity, the tire design relies on a geometric pattern of six-sided cells that are arranged in a matrixlike a honeycomb.
It has the same ride, reduced noise levels and heat generation as pressurized tires. The goal was to create an airless tire with uniform flexibility and load transfer that would endure tremendous wear and tear and still perform well. The best design was found in nature, which was the honeycomb.