{"id":10078204,"date":"2020-05-14T20:09:06","date_gmt":"2020-05-15T01:09:06","guid":{"rendered":"https:\/\/www.erbessd-instruments.com\/?p=10078204"},"modified":"2025-06-17T12:50:36","modified_gmt":"2025-06-17T17:50:36","slug":"torsional-vibration","status":"publish","type":"post","link":"https:\/\/www.erbessd-instruments.com\/de\/articles\/torsional-vibration\/","title":{"rendered":"Torsional Vibration – New ways to measure it"},"content":{"rendered":"\t\t
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New Ways to Measure Torsional Vibration<\/h1>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t
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Torsional Vibration<\/div><\/div><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Measuring torsional vibration <\/b>has long been a formidable challenge for vibration analysts. However, a revolutionary breakthrough emerges with the advent of new wireless technologies. These cutting-edge advancements swing open the door to an uncharted world that was once shrouded in mystery. Journey with us as we witness the unveiling of an extraordinary application for these transformative technologies.<\/p>

The introduction of wireless technologies<\/b> revolutionizes the field of torsional vibration measurement, transcending the limitations of traditional methods. By harnessing wireless capabilities, analysts gain unprecedented ease and flexibility in capturing and analyzing torsional dynamics. This technological leap offers a gateway to previously unattainable insights, opening up vast possibilities for diagnostic techniques and maintenance strategies.<\/p>

Don’t miss this momentous occasion as we showcase the potential of wireless technologies in reshaping the landscape of torsional vibration analysis. Join us on this captivating expedition as we explore the unbounded horizons it presents.<\/p><\/div><\/div><\/div><\/div><\/div><\/div>

What is Torsional Vibration?<\/h2><\/div><\/div>

Torsional vibration<\/strong>\u00a0is defined as a sequence of slight changes in the rotation speed of an object. Similar to conventional vibration, torsional vibration is also defined by the\u00a0amplitude<\/strong>\u00a0and\u00a0frequency<\/strong>\u00a0of these changes.<\/p>

Torsional vibration occurs when the rotating element is subjected to unequal loads during its operation. Common examples are\u00a0reciprocating compressors<\/strong>\u00a0and\u00a0internal combustion engines.<\/strong>\u00a0Since at one point in the cycle, the torque of one of the connecting rods is greater when air is compressed and decreases when air enters the chamber.<\/p>

Because of this, the crankshaft reflects variations in the rotation speed that might lead to\u00a0internal stresses<\/strong>, which in abnormal cases can produce a rupture of the crankshaft (or shafts, depends on the machine).<\/p><\/div><\/div><\/div><\/div><\/div><\/div>

Using Wireless Accelerometers to Measure Torsional Vibration<\/h2><\/div><\/div>

This illuminating case study that explores the remarkable potential of employing Erbessd Phantom<\/u><\/a>\u00a0wireless accelerometers for measuring torsional vibration.<\/b> In this captivating analysis, we not only unveil the sensor’s technical data but also cater to the curiosity of those eager to delve deeper into this fascinating subject matter. Join us as we unlock a wealth of insights and equip you with the necessary knowledge to venture further into the realm of torsional vibration measurement. This comprehensive study promises to ignite your curiosity and provide invaluable information for those seeking to advance in this field.<\/p><\/div><\/div><\/div><\/div><\/div><\/div>

How is Torsional Vibration Measured?<\/h2><\/div><\/div>

One of the most common methods used for measuring torsional vibration is the calculation of the\u00a0variation of the speed<\/strong>\u00a0using an\u00a0optical<\/strong> sensor and a piano-type tape. Hence recording the time difference between each step of the tape. There are certain restrictions for the measurement to be valid and reliable. One of them is the number of available samples per revolution since an incorrect sample rate can generate an aliasing effect or a saturation in the signal.<\/p><\/div><\/div><\/div><\/div><\/div><\/div>

New Alternatives<\/h2><\/div><\/div>

The use of\u00a0wireless vibration sensors<\/strong>\u00a0in the industry can provide new ways to measure torsional vibrations. We can now measure torsional vibrations directly to the shafts with the same sampling rate and resolution capabilities of current vibration analysis. We can even permanently\u00a0monitor the condition<\/strong>\u00a0of a rotating element under regular operating conditions, to visualize the evolution of its torsional vibrations.<\/p><\/div><\/div><\/div><\/div><\/div><\/div>

Case Study<\/h2><\/div><\/div>

We installed a\u00a0high-range triaxial vibration sensor<\/strong>\u00a0(PHANTOM EPH-V11E<\/u><\/a>) at the crankshaft end of a 3.2 HP rated two-cylinder air compressor for torsional vibration study purposes. This study intends to prove that the sensor is able to send a readable signal while being attached to the rotating shaft and also to verify the presence that of a second harmonic, product of the sum of the vibration by the variation of torque and the vibration by the inertia of the crankshaft (known components of the vibration torsional in this type of machinery).<\/p>

T<\/strong>he nominal speed of spindle rotation is 900 RPM<\/b> which is powered by a 3,600 RPM single-phase electric motor using a 4: 1 ratio pulley.<\/p>

Phantom EPH-V22 wireless accelerometer features<\/p>