compressed by two rotating or inter meshing rotors. According to the type of construction Rotary Compressor can be further classified as (a) Rotary Screw Compressor (b) Rotary Vane compressor. (a) Rotary Screw Compressor. Air is compressed between two rotating screw (male & female screw) and casing. The compression took place in gradually reducing space between these two parts. (b) Rotary Vane compressor. Air is compressed between casing & rotating rotor by
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Damage................................................. 3.10 Bent Shaft............................................................................ 3.11 Crack Shaft.......................................................................... 3.12 Rotor Unbalance.................................................................. 3.12.1 Types
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The Ultra Secret (Enigma) During World War II‚ it was essential to try and obtain secret high-value information from the Nazis. Such information was normally written in ciphers – secret methods of writing in code so that enemies cannot decrypt the information. The cipher used by Germany during World War II was a very complex polyalphabetic cipher‚ which was a code that alternated between multiple alphabets to write messages‚ making the message appear to be random letter combinations. The alphabets
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AIR TRANSPORTATION Early History of Flight: Around 400 BC - Flight in China • The discovery of the kite that could fly in the air by the Chinese started humans thinking about flying. • Kites have been important to the invention of flight as they were the forerunner to balloons and gliders. Hero and the Aeolipile • The ancient Greek engineer‚ Hero of Alexandria‚ worked with air pressure and steam to create sources of power. One experiment that he developed was the aeolipile which
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with the other cryptologists at Bletchley Park adapted the Polish Bombe machine. A bombe was also an electromagnetic device that was set up similar to the enigma. The bombe was created to determine which rotor was in place‚ and the order of the rotors. This machine consisted of twelve different rotor variations (Underwood Industrialization of Codebreaking). Turing revised the bombe by also making it recognize certain “cribs”. A crib is an algorithm of letters which match up to the cipher letters. To
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INTRODUCTION Electromagnetic clutches operate electrically‚ but transmit torque mechanically. This is why they used to be referred to as electromechanical clutches. Over the years EM became known as electromagnetic versus electro mechanical‚ referring more about their actuation method versus physical operation. Since the clutches started becoming popular over sixty years ago‚ the variety of applications and clutch designs has increased dramatically
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Electrical Machines - Questions and Answers Information courtesy of ALSTOM. INDUCTION MOTOR CONTROL GEAR 1. What are the main functions of control gear? 1. To provide a means of starting and stopping the motor and‚ at the same time‚ of limiting the starting current if required. 2. To give adequate protection to the motor under all conditions. 3. To allow speed changing when required. 4. To provide means of braking the motor when required. 5. To reverse the direction of rotation
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\\s CONDITION MONITORING OF ROTATING EQUIPMENT BY VIBRATION ANALYSIS AND DYNAMIC BALANCING TABLE OF CONTENT SL.NO | CHAPTERS | CONTENTS | PAGE.NO | 1. | | ACKNOWLEDGEMENT | 3 | 2. | | LIST OF FIGURES | 6 | 3. | | LIST OF CHARTS | 7 | 4. | | ABSTRACT | 8 | 5. | 1. | INTRODUCTION | 9 | 6. | | COMPANY PROFILE | 10 | 7. | 2. | LITRATURE REVIEW | | 8. | 3. | CONDITION MONITORING AND VIBRATION ANALYSIS | 12 | 9. | | THEORY OF VIBRATION | 17 | 10. | 4. | VIBATION
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------------------------------------------------- Electric generator In electricity generation‚ an electric generator is a device that converts mechanical energy to electrical energy. A generator forces electric charge (usually carried by electrons) to flow through an external electrical circuit. It is analogous to a water pump‚ which causes water to flow (but does not create water). The source of mechanical energy may be a reciprocating or turbine steam engine‚ water falling
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Abstract— This paper analyses the working of a stand-alone vertical wind turbine system with a Permanent Magnet Alternator (PMA) and a secondary system consisting of an energy storage device for storing energy during wind speed variations. The ancillary system is necessary to support the primary system and improve its reliability under drastic conditions. Initially‚ the entire system is modeled with the VIENNA Rectifier‚ and the storage system‚ excluding the PMA. The output power required by the
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