Sunday, 1 July 2012

The Presidential Elections & its Ramifications.





Finally the last day for filing the Nominations are over. The People in the race, Mr. Pranab Mukherji and Mr. P A Sangma. The UPA and the parties supporting Mr. Pranab have the electoral college of sending Pranab Mukherji to the Raisina Hills. So Mr. Pranab Mukherji, in all possibility,will be our next President. Mr. P A Sangma can feel comfortable in giving Mr. Pranab a good fight with the help of BJP, whom he had on several occassion condemned as a Hindutva Party. 

But the major political picture that is emerging, is that the congress can now feel relaxed in having broken or in fact making a crack in the NDA, by making the JD(U) and the Siva Sena support the UPA Nominee. Getting the SP is a huge advantage.It is also a major achievement for congress, as it can now feel more comfortable of gaining 271+ in the 2014 general elections.

Kudos to the Strategists of the UPA.  

Sunday, 3 June 2012

The Electronic Engine..



It is not generally known that the first airless injection system (i.e. not to use compressed air to atomise the fuel) was a common rail system. The invention of this system is often mistakenly credited to Doxford, but it was invented and patented by Vickers of Barrow in Furness.In this early common rail system the engine driven fuel pumps pressurised a fuel rail to about 400 bar from which pipes led to the fuel valves operated by cams and rocking levers. Independently driven pumps were provided to prime the system for starting.Later systems used hydraulically operated injectors, the delivery of fuel being controlled by a cam operated valve. Fuel quantity was controlled by an eccentric on the cam follower.

 With the integration of industrial electronics into marine engineering systems coupled with the giant strides made in the development of computer technology, it has now become possible to re-introduce the fuel injection common rail along with other fuel injection systems, using this modern technology to time the injection of fuel without mechanical aids.In addition to this, it has become possible to dispense with the timed camshaft altogether by using similar systems to control operation of valves and the air start system.

 The two major manufacturers of two stroke crosshead engines have both introduced a camshaft-less engine. Sulzer call theirs the RT Flex engine, and MAN B&W call theirs the ME intelligent engine. Both engines use electrical and engine driven axial piston pumps to pressurise servo oil rails to 200 bar which are then used for fuel injection and exhaust valve operation. In addition MAN B&W use the servo oil to drive the cylinder lubricator units (Alpha system).Although they both work without a camshaft and use computers to control, fuel injection, exhaust valve operation and air starting, the method of fuel injection is different.Sulzer use a pressurised fuel rail using a set of jerk type pumps driven by a three lobe cam geared to the crankshaft. The pumps are variable delivery, based on the ZA40 fuel pump, controlled by an electrically driven fuel pump shaft linked to the engine computer.

 The engine computer system known as the Wartsila Engine Control System (WECS)controls the delivery from the common rail to the individual cylinders via the volumetric injection control system which uses finely filtered engine LO pressurised by electric pumps to 200 bar.When the Rail Valves are energized for injection by the Valve Driver Module, oil from the Control Rail opens the Injection Control Valves. The fuel injectors are pressurized and fuel oil pressure behind the Fuel Quantity Piston maintains this pressure at the injectors. As the Piston moves to the left a feedback signal is sent to the Cylinder Control Module.At low engine load the control system cuts out one of the three injection valves per cylinder.At very low load two of the three injection valves are cut out. This is used to avoid visible smoke emission and to reduce fuel consumption. It is possible to reduce engine load to 10% with engine revolutions as low as 7RPM.

Unlike the Sulzer RT Flex engine the MAN B&W ME engine does not operate the fuel injection on a common rail system.Instead a solenoid operated proportioning valve (the FIVA valve - Fuel Injection Valve Activation) allows the pressurised servo oil under a hydraulic piston. This then moves the fuel pump piston upwards, raising the fuel pressure and opening the injection valves.A nitrogen filled accumulator maintains the hydraulic servo oil pressure during the operation of the pump.To be able to time the fuel injection the Control Systems must know the crank angle of the individual units. To do this two crank angle sensors are fitted at the free end of the engine. These sensors are accurate to 0.1°. Cylinder pressures and powers are continually monitored by using strain gauges built into the cylinder head, and the computer automatically compensates for twist in the crankshaft when relating crankshaft position to cylinder pressure. the systems give complete flexibility over start and end of injection and take into account fuel quality, dead time (the time between injection start command being given and actual injection), and Variable Injection Timing (VIT).



The exhaust valve actuator replaces the cam operated exhaust valve hydraulic pump on both make of camshaftless engines. Both working on a similar principle, servo oil at 200 bar is used to operate a piston which operates the exhaust valve "hydraulic push rod" The oil for operating the "hydraulic push rod" comes from the main engine LO supply via a non return valve.The air start system is similar to that on a  conventional engine except there is no need for a mechanically driven distributor to open the air start valves at the correct time.Instead of a camshaft driven, reversing air start distributor, each air start valve is opened at the correct time by the engine computers sending a signal to a solenoid controlled nc (normally closed) valve.

 The timing of the air start valves will vary depending on the number of cylinders, but they will be open for a long enough period to allow overlap, so that a valve opens before the previous valve closes, allowing starting from any position of rest. The nominal opening can be considered as 0° (ie TDC) and closing at 110° ATDC.The computer knows when to send the signal because it is receiving information as to the crankshaft position from the angle encoders which measure crankshaft position and RPM.When the engine has reached firing speed the computers shut off the air and introduce the fuel.

 

Sunday, 29 April 2012

The Thrissur Pooram.....


Thrissur Pooram is the most spectacular festival of Kerala. It is aptly called Pooram of all Poorams where Pooram means 'the meeting point of all the arts'. Rich art and culture of the state of Kerala can be seen in all its splendor in this marathon 36 hours festival.

Thrissur Pooram is celebrated in the asterism Pooram in the month of Medam according to Malayalese calendar. This refers to the month of April-May according to Gregorian calendar. The festival was introduced by the erstwhile Maharaja of Kochi, Rama Varma. Celebrations are held at Thekkinkadu grounds encircling the Vadakunnathan temple. A large number of spectators and devotees assemble to watch the joyous festival which witnesses a meeting of deities of ten different temples. Procession of decorated elephants, dazzling display of fire works are the major attractions of the festival besides several other enthralling musical programmes and events.

Origin
Tradition of celebrating Thrissur Pooram as it is seen today was started by erstwhile Prince of Kochi (Cochin), Rama Varma also called Sakthan Thampuran (1775-1790). There is a little history to the festival which says that before Thrissur Pooram, a one-day temple festival was held at Aarattupuzha, 12 km south of the Thrissur. Temples located in and around Thrissur used to regularly participate in the ceremonies. All was going well until one day, chief of the Peruvanam area of Cherpu denied access to other temples to uphold the supremacy of Namboodiri. Namboodiris is the dominant brahmin caste in Kerala.

Prince Raja Varma, the architect of Thrissur, decided to put an end to Namboodiri supremacy and assuage the wounded confidence of his subjects. Rama Varma undertook the task of renovating Vadakunnathan temple, which was earlier bounded by high walls and was controlled by Namboodiris. He took on himself to look after the temple and made it open to all. He invited other temples with their deities to Thrissur to pay obeisance to Lord (Sri) Vakunnathan, the deity of the Vadakunnathan temple. The Prince also directed the main temples of Thrissur, Thiruvampadi and Pamamekkavu, which had never been under the control of Namboodiris to help other participating temples. It is said that the Prince also chalked the schedule of the 36 hours festival. The Pooram was thus made open to one and all. This also explains the secular nature of the festival. It is fascinating to note that Christians, Muslims and people of all castes participate with vigour and zeal in the Pooram.

Religious Programme
Following the ancient tradition, Thrissur Pooram is confined to the temples of Devi (goddess) and Sastha (divine combination of Shiva and Vishnu). Ten deities from the neighboring temples pay obeisance to the presiding deity of Thrissur. Chief participants are Paramekkavu and Tiruvambadi. Other participants called 'Cherupooram' include Kanimangalam, Karamukku, Choorakkattukara, Laloor, Ayyanthole, Neithilakkavu, Chembukkavu and Panamukkampilly.

The festival extends for 36 hours beginning with ezhunellippu of the Kanimangalam Shasta in the morning, followed by the ezhunnellippu of the other six minor temples on the Pooram Day. Where 'ezhunnellippu' is a ritual symbolising the visit of the Devi from the Paramekkavu and Thiruvambadi temples to the Vadakkunnathan temple. It may be noted that although this grand festival is known as Thrissur Pooram, it is in fact the conclusion of the eight-day Utsavams of nine temples.

Rituals and Celebrations
Major participants of the Pooram, Paramekkavu and Thiruvambadi provide a spectacular show of best of Kerala art and culture to the onlookers as they display their artistic prowess. The groups of artists vie with each to prove their mastery over their respective art and provide a rare show of talent to the spectators.

Massive and colourful processions are organised by temples, starting from Krishna Temple and Devi Temple. The groups enter the Vadakumnatha Temple through the western gate and take exit from the southern gate of the temple. This way they come face to face and the competition becomes open.

A major attraction of the festival is 'Panchavadyam'. Over 200 artistes from various disciplines like Thimila, Maddalam, Trumpet, Cymbal and Edakka unleash their talent and leave the audience spell bound. Time of noon is reserved for another event called, 'Pandemelam', in which artistes holding mastery of drum, trumpets, pipe and cymbal participate.

A procession of caparisoned elephants is the most enchanting facet of Thrissur Pooram. On the Pooram evening, two lines of 13 decorated elephants face each other, on the ground south to the temple. The best of elephants are selected for the procession and given a massive make over. They are painted, bejeweled and given a beautiful satin robe. Colourful silk parasols are the important parts of their get up. Each of the majestic pachyderm gets the honor of bearing an umbrella holder, a peacock fan carrier and a yak-tail fly whisk wielder. This exhibition of the paraphernalia of elephant decorative is called 'Aana Chamayal Pradarsanam'. Commissioning of elephants and the parasols is vital and is done with utmost secrecy as winning the competition is a matter of pride for the organisors.

Space between the two lines of elephants is taken up by the orchestra consisting of percussion and wind instruments. Just when the orchestra reaches its crescendo, the parasols are changed with an even more colourful and exquisite one. The ceremony is called, 'Kudamattom'. This is very exciting for the crowds who applaud whole heartedly every time the parasols change. The revelry continues till late in the evening. The deities of different temples arrive on the regally decorated elephants. The sight of the meeting of the different 'Gods' is brilliant and memorable one.

The festival concludes with the dazzling display of fire works. The bursting of crackers continues till the wee hours of the next morning. Shows by Thiruvambadi and Paramekkavu Devaswams are the most reputed and popular of all. Thus the festival which begins in the early hours of the Pooram morning concludes at the break of the dawn, the next day on a cheerful note.

The Post of the President of India...









The time is running out and we are awaiting the list of probables who would make it the Rashtrapathi Bhavan. This time around there seems to be a tight scenario, not just the major parties like the Congress and the BJP taking the lead, even the regional parties have started to put forth there preferances for the top post. Former President Dr. Kalam seem to hit the headlines first. The SP is indicating that they favour Dr. Kalam, while the BJP at this moment is keeping its cards close to its chest. But the congress seems to be in no mood to Go for Dr. Kalam. The crucial 2014 Elections,Chances of Hung Parliament and the biggers roles which the regional Parties are gaining after each and every Assembly polls Might be the major issues before the Parties, While comming out with there choice. The country is awaiting a message from the Political circle.