Archive for October 2011

List of mechanical core companies in India

October 10, 2011

Dear Friend,

Don’t think about the job as you are a student of an evergreen as well as a core branch i.e.,Mechanical stream.

there are so many chances in Govt. as well as private companies.

There huge number of Core Companies for Mechanical engineer.
some of them are:

1:Hindustan Motors Ltd
2:Hyundai Motors India Ltd
3:Mahindra & Mahindra
4:Royal Enfield Ltd
5:Addison & Co Ltd
6:Ashok Leyland Ltd, Ennore
7:Axles India Ltd
8:TATA Motors
9:Sundaram-Clayton Ltd
10:Tractor and Farm Equipment (TAFE)
11:Tube Investments of India Ltd
12:FIAT
13:Bharat Electronics Ltd.(BEL)
14:Jindal Steel
15:Steel Authority of India Limited(SAIL)
16:Geometrics ,The Developers software for Machine Companies etc…..

Good luck!!!
Good luck!!!

Produce Electricity From Solar Heat

October 4, 2011

01-solar thermal power conversion-beam radiation-direct normal irradiation-Solar-Power-in-Florida-turning solar heat into electricity

The principles of solar thermal power conversion have been known for more than a century; its commercial scale-up and exploitation, however, has only taken place since the mid 1980s. With these first large-scale 30-80 MW parabolic trough power stations, built in the California Mojave desert, the technology has impressively demonstrated its technological and economic promise. With few adverse environmental impacts and a massive resource, the sun, it offers an opportunity to the countries in the sun belt of the world comparable to that currently being offered by offshore wind farms to European and other nations with the windiest shorelines.

01-direct radiation-solar radiation-electromagnetic radiation-solar collectors-insolation

Solar thermal power can only use direct sunlight, called ‘beam radiation’ or Direct Normal Irradiation (DNI), i.e. that fraction of sunlight which is not deviated by clouds, fumes or dust in the atmosphere and that reaches the earth’s surface in parallel beams for concentration. Hence, it must be sited in regions with high direct solar radiation. Suitable sites should receive at least 2,000 kilowatt hours (kWh) of sunlight radiation per m2annually, whilst best site locations receive more than 2,800 kWh/m2/year.

01-solar panels-solar power energy-solar power system-diagram_solar_power-produce electricity from solar energy example

In many regions of the world, one square kilometer of land is enough to generate as much as 100-130 Giga watt hours (GWh) of solar electricity per year using solar thermal technology. This is equivalent to the annual production of a 50 MW conventional coal- or gas-fired mid-load power plants. Over the total life cycle of a solar thermal power system, its output would be equivalent to the energy contained in more than    5 million barrels of oil2).

TURNING SOLAR HEAT INTO ELECTRICITY

01-illustration_trough_collector_from_sunlight-solar collector assembly-parabolic trough solar collector

Producing electricity from the energy in the sun’s rays is a straightforward process: direct solar radiation can be concentrated and collected by a range of Concentrating Solar Power (CSP) technologies to provide medium- to high temperature heat.

01-concentrating solar power plants-CSP Technologies-Concentrating solar power technologies-direct solar radiation process-parabolic solar trough collectors

This heat is then used to operate a conventional power cycle, for example through a steam turbine or a Stirling engine. Solar heat collected during the day can also be stored in liquid or solid media such as molten salts, ceramics, concrete or, in the future, phase-changing salt mixtures. At night, it can be extracted from the storage medium thereby continuing turbine operation.

Personal Flying Jetpack Machine

October 4, 2011

silver-jetpack-martin aviation company-himmelsturner       

This Jetpack consists of a built-in gasoline engine driving twin ducted fans which produce sufficient thrust to lift the aircraft and a pilot in vertical takeoff and landing, enabling sustained flight.

01-martin-aircraft-jetpack-commercial jetpack manufacturers-personal flying  machine jetpack- jetpack machines

Jetpack Development:


Since the beginning of time man has dreamed of personal flight – the ability to fly as free as birds and escape gravity’s pull.

From the 1920s this dream has been refined in film, books and television, with the jetpack portrayed as the ultimate tool for the freedom of flight.

In the 1950s the first serious attempts at building a jetpack produced the Bell Rocket Belt. But the Bell Rocket Belt has some limitations. It is powered by an expensive and hazardous fuel, needs a light weight pilot, is incredibly hard to fly, and, after 50 years of development can only fly for 30 seconds. It is not the practical jetpack the world has been waiting for.

In 1981, as a New Zealand student, started his quest to a build a jetpack that overcame the limitations of the Rocket Belt. With enthusiasm and commitment Glenn has been able to capture the support of a large network of experts who shared his dream.

01-jetpack-30 minutes of flight time-gasoline engine-two ducted fans

The rest is history. On 29 July 2008, the world’s first practical jetpack, was revealed to the world and became an international media sensation.

Jetpack Technology:

01-carbon fibre composite jetpack-VTOL-vertical take off and landing aircraft- fan jet technology-martin-aircraft-jetpack-commercial jetpack manufacturers-personal flying  machine jetpack

The Jetpack is constructed from carbon fiber composite, has a dry weight of 250 lbs (excluding safety equipment) and measures 5 ft high x 5.5 ft wide x 5 ft long. It’s driven by a 2.0 L V4 2 stroke engine rated at 200 hp (150 kw), can reach 8000 ft (estimated) and each of the two 1.7 ft wide rotors is made from carbon / Kevlar composite.

There is always risk associated with flying so the Aircraft has been careful to equip the pack with redundant systems that will take over in the event that the main system goes down. If a crash-landing is required, a pilot-operated toggle will rapidly fire a small amount of propellant deploying a ballistic parachute (similar to a car airbag) which will allow the pilot and jetpack to descend together. It also has an impact-absorbing carriage, patented fan jet technology and 1000 hours engine TBO (Time Between Overhaul). Small vertical take-off and landing aircraft (VTOL) are not subject to the same limitations as other helicopters and fixed wing aircrafts but Aircraft have built it to comply with ultra light regulations and therefore suggest it as at least as safe to operate, and claim it is the safest of all jetpacks yet built.

01-jetpack-a personal aircraft

The Jetpack achieves with 30 minutes of flight time and is fueled by regular premium gasoline.

Safety Development:

Roll cage:

01-steel roll cage

roll cage is a specially constructed frame built in (or sometimes around) the cab of a vehicle to protect its occupants from being injured in an accident, particularly in the event of a roll-over. A roll bar is a single bar behind the driver that provides moderate roll-over protection. Due to the lack of a protective top, some modern convertibles utilize a strong windscreen frame acting as a roll bar. Also, a roll hoop may be placed behind both headrests, which is essentially a roll bar spanning the width of a passenger’s shoulders.

Factor Of Safety:

The Jetpack has a number of mechanical things moving fast….a drive train, Fan jets. All these are designed with far higher “factors of safety” (FOS) than is normal for an aircraft. This was done because of the newness of the design and to cover for unforeseen factors. For instance the Fan blades have a FOS of 5, at the hub and over 10 at the blade.

Parachute:

01-parachute-in aircrafts-jetpacks

Production versions of the Jetpack are equipped with a Ballistic Parachute system from Ballistic Recovery Systems. This enables the pilot to be saved from a catastrophic failure down to a reasonably low altitude. Ballistic parachutes can open at very low altitudes, particularly if the aircraft has some forward speed. For this reason the “flight profiles” will be calculated to have the lowest risk possible.

01-jetpack-parachute compartment-flying controls-twin turbo jets

Application:

  • Emergency response,
  • Defense and recreation, with numerous applications in each sector.

Spiral Tube Ink Refilling

October 4, 2011

ballpoint pen is a writing instrument with an internal ink reservoir and a sphere for a point. The internal chamber is filled with a viscous ink that is dispensed at its tip during use by the rolling action of a small sphere.


 01-Spiral Ink refill-Ink Refill-Ball Point pen refills-double ink capacity ball point pens-double helix pen-spiral pen tubes

There are two basic types of ball point pens:

  • Disposable
  • Refillable.

Disposable pens are chiefly made of plastic throughout and discarded when the ink is consumed; Refillable pens are metal and some plastic and tend to be much higher in price. The refill replaces the entire internal ink reservoir and ball point unit rather than actually refilling it with ink, as it takes special high-speed centrifugation to properly fill a ball point reservoir with the viscous ink. The simplest types of ball point pens have a cap to cover the tip when the pen is not in use, while others have a mechanism for retracting the tip. This mechanism is usually controlled by a button at the top and powered by a spring within the pen body, but other possibilities include a pair of buttons, a screw, or a slide.

02-Spiral Ink refill-Ink Refill-Ball Point pen refills-double ink capacity ball point pens-double helix pen-spiral pen tubes

Think about it, instead of having a straight tube ink refill, how about fashioning it as a spiral? Agreed it occupies a bit more space so the pen can’t be sleek and slim, but it holds double the amount of ink! There’s a reason why our DNA is structured in a double helix. I guess it will work like a charm for those disposable types, making them last longer.