Comparison of torsional vibration measurement techniques
Noise and vibration attributes play an important role in the development of any rotating components, such as engines, drivelines, transmission systems, compressors and pumps. The presence of torsional vibrations and other specific speed-related phenomena require the dynamic behavior of systems and components to be designed accurately. Not taking into account torsional vibrations during the early design stages can lead to critical issues like comfort problems, performance decrease and durability related problems. Torsional vibrations are angular vibrations of an object, typically a shaft along its axis of rotation. As mainly rotational speeds are measured, torsional vibrations are assessed as the variation of rotational speed within a rotation cycle. These RPM variations are typically induced by a non-smooth driving torque or a varying load. Structural sensitive frequencies along a driveline may then amplify and transfer these phenomena leading to comfort, durability or efficiency problems. The level of torsional vibration is influenced by a number of parameters, such as material properties, operating conditions like temperature, load, rpm... and will need to be taken into account. In the (very) early design stages, simulation techniques can be used, but despite tremendous progress in modeling accuracy, overall system complexity still necessitates accurate qualification and quantification of these torsional vibrations by means of experimental testing under controlled or real-life operating conditions. This paper provides an overview of the instrumentation and challenges related to torsional vibration testing. The accuracy and performance of five measurement techniques (high-speed incremental encoder, dual beam laser interferometer, zebra tape, zebra disc and direct pulse measurements with magnetic probe) are investigated and compared. The potential sources of error and possible corrections are discussed for each technique. Once accurate measurement data is available, specific processing techniques are used to quantify the torsional vibration phenomena or to correlate them with other acoustic or vibration responses of the structure. The interpretation of the measurement can be simplified with a good visualization of the deformation on a 3D geometry of the test object. Animating the deformation at a fixed frequency or according to measured torsional orders allows to better qualify the importance of the phase relation between the different shafts or sections of shaft and vibration or acoustic responses. Specific industry examples are discussed in which torsional vibration analysis plays an important role to improve the design and overall performance.
Wim Hendricx Karl Janssens Laurent Britte
LMS International,Belgium
国际会议
上海
英文
1-13
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）