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This class lets me ping other servers/hosts from my Java application, using the ping command from the host operating system. In my case, I'm using Mac OS X 1. I'm using the Mac ping command, which is located in the /sbin directory. My Java ping class (program) source code. Here's the source code for my Java. Ping. Example. Program. A Java ping class. Kill Ping is an online gaming application which reduces high ping and packet loss eliminating lag. Kill Ping is a fix for LoL lag, WoW lag, Dota 2 lag, CS:GO lag, Overwatch lag, Battleborn lag and Doom 4 lag etc. It's not possible to really 'ping' a machine to check if it's alive or not (it's a long story, but to keep it short I will just say that the Socket class is not low-level enough for that operation). Here's an example. List< String> commands = new Array. List< String> (). As the main method shows, you can ping a network host like www. List of String objects. The command shown in the code would look like this if issued on the command line. Java ping class/program and Inet. Address. As a final note before leaving today, I thought I'd be able to accomplish this task using the is. Reachable method of the Inet. Address class, but that method didn't work as expected. For instance, while I am able to ping www. Reachable method returns false when I try to access the same hostname. Therefore, I created my own Java ping program, as shown above. Okay, one more final note: As you might guess from my Java ping class/program, I'm actually working to make this class more generic, so I can easily run any system command. Running the command is easy, but trying to determine what to do with standard output and standard error streams requires a little more thought, especially if you want to run your commands from a Java GUI app, and display the output in real time in the GUI. Pingzapper — Lower ping in games. Pingzapper supports today? You can use Pingzapper to add custom games via our easy- to- use app. Free Drawing Software. Free drawing software created a spark inside of me like nothing else had before by allowing me to bring what I was drawing on paper into the computer where I could instantly share it with the whole world over the internet. There are a number of different types of drawing software out there. I checked out what I thought was the best free drawing software for each of the following areas: drawing and painting, illustration, and 3. D. You may have heard of some commercial software, so I have compared these free packages to those commercial ones so you should have some idea of what to expect. The fist software is called Sketchup and is brought to us for free by the kind people at Google. This free drawing software is a little different than the other packages. This one deals in the third dimension, or 3. D. I first saw this program a few years ago, and it looks like Google has bought it and now released it for free - lucky us! Learn how to draw, jazz up your doodles and sketches. Create your own original artwork for your desktop publishing documents and Web pages with these easy to follow lessons on how to draw people (including how to draw stick. I gave it a try and in about 1. I had created this little art- modern living space. I think this software is really cool - and if you are studying perspective, or are interested in architectural or technical drawings I would really highly recommend it. If 3d and perspective sounds interesting to you go check it out at http: //sketchup. Toondoo lets you create comic strips and cartoons easily with just a few clicks, drags and drops. Want to watch this again later? Sign in to add this video to a playlist. Herbert Lawrence Block, commonly known as Herblock (October 13, 1909 -- October 7, 2001), was an American editorial cartoonist and author best. Welcome to GoComics.com, the world's largest comic strip site for online classic strips like Calvin and Hobbes, Dilbert, Non Sequitur, Get Fuzzy, Luann, Pearl Before Swine, 9 Chickweed Lane and more! Free drawing software created a spark inside of me like nothing else had before by allowing me to bring what I was drawing on paper into the computer where I could instantly share it with the whole world over the internet. Acting Assistant Attorney General Tracy Henke, who oversees the COPS program, says most police departments that got grants spent them effectively. She says the Bush administration is shutting down COPS to cut costs. The best drawing and writing apps. Combined with an Adonit stylus, you get features like Pressure Sensitivity and Palm Rejection. Art Goes Digital: What is the best drawing tablet and which tablet should I buy? Introduction and graphics tablet comparison. Artists all around the world are quickly finding themselves thrown headfirst into the age of digital. Political cartoons deliver a punch. They take jabs at powerful politicians, reveal official hypocrisies and incompetence and can even help to change the course of history. But political cartoons are not just the. If you would like to try making some really nice clean computer drawings like you see in magazines or on television this software can help you get started. I played with the software and quickly created this smiley face. Illustration software is essential to learn for anyone wanting to be a graphic designer. For more information please look at http: //www. The other free drawing software that I looked at is called Gimp. This is the most popular free drawing software that you can currently find on the internet. It's quite similar to Adobe Photoshop, and I was amazed at comparable they are. It's really awkward to draw with a mouse, and if you are serious about using this particular free drawing software I would highly recommend a tablet so you can use a pen. When doing 3. D or illustration a tablet can be useful, but you can get by fine with a mouse. For real drawing or painting on the PC nothing beats a tablet. If you prefer to draw with a rock, stick with the mouse, but if you like to draw with a pencil, pen or brush you will feel right at home with a tablet. For more information on Gimp go here: http: //www. I highly recommend all of these packages. When I started doing art on the computer I was limited to MS- Paint (which comes with windows) which was a pretty basic tool. Luckily for new artists today there are packages like the ones below to help you bridge the gap between traditional and digital art. That wraps up my review of free drawing software. I really feel that these three packages are the best out there right now for the different aspects of drawing and creating art on the computer. I would really suggest trying these programs out before you put any money down to buying anything. Drawing software isn't cheap, so why not try it out for free before you decide to spend hundreds of dollars? More Free Drawing Programs. If you didn't quite find what you're looking for on this page, then check out the other free drawing programs that are recommended here. There's an even better painting software similar to Adobe Photoshop that you can find on this page. Selecting Your First PC Drawing Tablet. Once you're ready to get into creating art on the computer you're really going to want to get a tablet. The good news is that even inexpensive tablets can be used to create professional works. Learn more about which tablet is right for you. Video Gimp Tutorial - Setting up the Software and Tablet- Video. In this lesson you will learn about how to download and get setup with this fantastic free software for drawing. This software works great with XP, Vista and Mac, so I highly recommend it. What the video and get setup today! Using Paint. net with a Computer Drawing Tablet- Video. Paint. net is another free drawing program that you can use with a tablet. If you are just getting started with drawing on the computer you may want to check out this program and your tablet. Watch the Video for full details. How to 3. D and Technical Drawing Software. Tech drawing software is great because it lets you use the total power of the computer to do all kinds of amazing things that you just can't do with traditional drawing programs. This guide also has links to many free downloads of world- class 3. D software that you can grab today! Choosing Professional Drawing Software. This guide walks you through the different types of professional drawing software out there and helps you choose the one that's best suited to the style of art you want to create. Are you looking to make a breakthrough with your artistic abilities? Artists from the world's top studios like Disney, Nickelodeon, Blue Sky, and Pixar are sharing their hard- earned knowledge so you can learn directly from the people who create the amazing comics, movies and cartoons that we all watch and love. If you're tired of looking for a good teacher - stop looking right now and click this link. Click here to return from Free Drawing Software to How to Draw. The operation of a synchronous motor is due to the interaction of the magnetic fields of the stator and the rotor. Its stator winding, which consists of a 3 phase winding, is provided with a 3 phase supply, and the rotor is. Code: AE10 ELECTRICAL ENGINEERING 1 Code: AE10 Subject: ELECTRICAL ENGINEERING PART - I TYPICAL QUESTIONS & ANSWERS OBJECTIVE TYPE QUESTIONS Q.1 The two windings of a transformer is (A) conductively linked. Most AC motors are induction motors. Induction motors are favored due to their ruggedness and simplicity. In fact, 90% of industrial motors are induction motors. Nikola Tesla conceived the basic principals of the polyphase. Consult WEG's entire Explosion Proof Motor catalogue on DirectIndustry. Synchronous motor - Wikipedia, the free encyclopedia. A synchronous motor- generator set for AC to DC conversion, circa 1. Small synchronous motor and integral stepdown gear from a microwave oven. A synchronous electric motor is an AC motor in which, at steady state. Synchronous motors contain multiphase AC electromagnets on the stator of the motor that create a magnetic field which rotates in time with the oscillations of the line current. The rotor with permanent magnets or electromagnets turns in step with the stator field at the same rate and as a result, provides the second synchronized rotating magnet field of any AC motor. A synchronous motor is only considered doubly fed if is supplied with independently excited multiphase AC electromagnets on both the rotor and stator. The synchronous motor and induction motor are the most widely used types of AC motor. The difference between the two types is that the synchronous motor rotates in exact synchronism with the line frequency. The synchronous motor does not rely on current induction to produce the rotor's magnetic field. By contrast, the induction motor requires . Small synchronous motors are used in timing applications such as in synchronous clocks, timers in appliances, tape recorders and precision servomechanisms in which the motor must operate at a precise speed; speed accuracy is that of the power line frequency, which is carefully controlled in large interconnected grid systems. Synchronous motors are available in sub- fractional self- excited sizes. 7) Turn ON the PS and adjust the DC motor rheostat for a motor speed of 1800 rpm. Close the switch on the S synchronous motor and adjust the DC. Now you've got me thinking. You're on the right track with your mental model. Unfortunately, while there are a lot of direct mechanical analogues of electrical effects, they do tend to break down if we examine them too. These machines are commonly used in analog electric clocks, timers and other devices where correct time is required. In high- horsepower industrial sizes, the synchronous motor provides two important functions. First, it is a highly efficient means of converting AC energy to work. Second, it can operate at leading or unity power factor and thereby provide power- factor correction. Synchronous motors fall under the more general category of synchronous machines which also includes the synchronous generator. Generator action will be observed if the field poles are . Motor action will be observed if the field poles are . At synchronous speed it rotates in step with the rotating magnetic field of the stator, so it has an almost- constant magnetic field through it. The external stator field magnetizes the rotor, inducing the magnetic poles needed to turn it. The rotor is made of a high- retentivity steel such as cobalt steel, These are manufactured in permanent magnet, reluctance and hysteresis designs. Typically there are fewer rotor than stator poles to minimize torque ripple and to prevent the poles from all aligning simultaneously. This creates a torque pulling the rotor into alignment with the nearest pole of the stator field. Thus at synchronous speed the rotor is . This cannot start the motor, so the rotor poles usually have squirrel- cage windings embedded in them, to provide torque below synchronous speed. The machine starts as an induction motor until it approaches synchronous speed, when the rotor . Very small reluctance motors have low torque, and are generally used for instrumentation applications. Moderate torque, integral horsepower motors use squirrel cage construction with toothed rotors. When used with an adjustable frequency power supply, all motors in the drive system can be controlled at exactly the same speed. The power supply frequency determines motor operating speed. Hysteresis motors. The rotating stator field causes each small volume of the rotor to experience a reversing magnetic field. Because of hysteresis the phase of the magnetization lags behind the phase of the applied field. The result of this is that the axis of the magnetic field induced in the rotor lags behind the axis of the stator field by a constant angle . As long as the rotor is below synchronous speed, each particle of the rotor experiences a reversing magnetic field at the . There is a 2- pole low reluctance bar structure in the rotor. Therefore, it is self- starting and doesn't need an induction winding to start it, although many designs do have a squirrel- cage conductive winding structure embedded in the rotor to provide extra torque at start- up. More expensive than the reluctance type, hysteresis motors are used where precise constant speed is required. The stator carries windings connected to an AC supply to produce a rotating magnetic field. At synchronous speed the rotor poles lock to the rotating magnetic field. Permanent magnet synchronous motors are similar to brushless DC motors. Because of the constant magnetic field in the rotor these cannot use induction windings for starting. These motors require a variable- frequency power source to start. Some studies seem to indicate that Nd. Fe. B permanent magnet synchronous motors are around 2 percent more efficient than the highest- efficiency (IE3) asynchronous motors - - using the same stator laminations and similar variable- frequency speed controllers. The exciter is clearly seen at the rear of the machine. Usually made in larger sizes (larger than about 1 horsepower or 1 kilowatt) these motors require direct current (DC) supplied to the rotor for excitation. This is most straightforwardly supplied through slip rings, but a brushless AC induction and rectifier arrangement may also be used. The number of poles per phase is 1. Ns=1. 20. The slip rings can be seen below the rotor drum. In some machines or when a large number of poles are needed, a salient pole rotor is used. Its stator winding, which consists of a 3 phase winding, is provided with a 3 phase supply, and the rotor is provided with a DC supply. The 3 phase stator winding carrying 3 phase currents produces 3 phase rotating magnetic flux (and therefore a rotating magnetic field). The rotor locks in with the rotating magnetic field and rotates along with it. Once the rotor locks in with the rotating magnetic field, the motor is said to be in synchronization. A single- phase (or two- phase derived from single phase) stator winding is possible, but in this case the direction of rotation is not defined and the machine may start in either direction unless prevented from doing so by the starting arrangements. When the motor load is increased beyond the breakdown load, the motor falls out of synchronization and the field winding no longer follows the rotating magnetic field. Since the motor cannot produce (synchronous) torque if it falls out of synchronization, practical synchronous motors have a partial or complete squirrel- cage damper (amortisseur) winding to stabilize operation and facilitate starting. Because this winding is smaller than that of an equivalent induction motor and can overheat on long operation, and because large slip- frequency voltages are induced in the rotor excitation winding, synchronous motor protection devices sense this condition and interrupt the power supply (out of step protection). This property is due to the inertia of the rotor; it cannot instantly follow the rotation of the magnetic field of the stator. Since a synchronous motor produces no inherent average torque at standstill, it cannot accelerate to synchronous speed without some supplemental mechanism. Very large motor systems may include a . Such small synchronous motors are able to start without assistance if the moment of inertia of the rotor and its mechanical load is sufficiently small . See Shaded- pole synchronous motor for how consistent starting direction is obtained. Features of Synchronous Motor. That is, while running it maintains a constant speed. The speed is independent of load. It is not inherently self starting. It has to be run at synchronous speed by some means before it can be synchronized to supply. It can be operated under wide range of power factors both lagging and leading. It will stall if, while running, counter torque is increased beyond the maximum torque that machine can develop. Applications, special properties, and advantages. Excitation at which the power factor is unity is termed normal excitation voltage. This causes a demagnetizing effect due to armature reaction. With increasing field current armature current at first decreases, then reaches a minimum, then increases. The minimum point is also the point at which power factor is unity. Since most power systems of any significant size have a net lagging power factor, the presence of overexcited synchronous motors moves the system's net power factor closer to unity, improving efficiency. Such power- factor correction is usually a side effect of motors already present in the system to provide mechanical work, although motors can be run without mechanical load simply to provide power- factor correction. In large industrial plants such as factories the interaction between synchronous motors and other, lagging, loads may be an explicit consideration in the plant's electrical design. If load is applied further then the motor will lose its synchronism, since motor torque will be less than load torque. E.; Charles Kingsley, Jr.; Alexander Kusko (1. Electric Machinery, 3rd Ed. Library of Congress Catalog No. E.; Charles Kingsley, Jr.; Alexander Kusko (1. Electric Machinery, 3rd Ed. Library of Congress Catalog No. Practical electric motor handbook, 2nd Ed. ISBN 9. 78- 0- 7. R. Industry Applications, IEEE Transactions on. The Shape Design of Permanent Magnet for Permanent Magnet Synchronous Motor Considering Partial Demagnetization. Magnetics, IEEE Transactions on. Industry Applications, IEEE Transactions on. Industry Applications Conference, 1. Thirty- Second IAS Annual Meeting, IAS '9. Conference Record of the 1. IEEE. Industrial Electronics, IEEE Transactions on. Mehri, Darius Mehri (2. Jordan, Energy- Efficient Electric Motors and Their Applications, page 1. Springer, 1. 99. 4 ISBN 0- 3. Electrician's toolbox etc. University of Alberta. Variable Frequency Ac Motor Drive System. Peter Peregrinus, Ltd. ISBN 9. 78- 0- 8. Handbook of Large Turbo- Generator Operation and Maintenance (Second ed.). Handbook of Electric Motors (Second ed.). |
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