When faced with a vibration problem, engineers generally start by making some measurements to try to isolate the cause of the problem. www.bksv.com, 2 Presenter • Martin Alexander P.E. Save Save BASICS OF VIBRATION.ppt For Later. Vibrations in Rotating Machinery (7th Int'l Conf.) • Solution Manager Telecom Audio • Senior Sales Engineer • BSME Cooper Union • SMME MIT • 10+ years consulting in sound and vibration • 32 years with Brüel & Kjær. 1.1. There are two types of piezoelectric accelerometers, – High Impedance – Low Impedance. 4/5/2014 1Hareesha N G, Asst. By using the light of a stroboscope to “freeze” or “slowly move” the stud, quite high-frequency small-amplitude vibrations may be measured. The Stroboscope Method. Carousel Previous Carousel Next. Sunil Rathava: 140803119503 While the inner-workings and formulas used to calculate various forms of vibration can get complicated, it all starts with using an accelerometer to measure vibration. to monitor machine condition during start-ups, shutdowns and norma l operation. (IME, 2000) WW. You can change your ad preferences anytime. And, finally, we measure acceleration using a unit of measurement called G’s, or equivalent gravities. There are many ways of measuring severity, depending on the instrument used - it can be measured in terms of amplitude (displacement), velocity, or acceleration. Vibration measuring instrument - Vibrometer 1. Reliable diagnosis of overall machine … Examples would include measuring the vibration of a car's body when it is attached to an electromagnetic shaker, or the noise pattern in a room when excited by a loudspeaker. It is applicable to measurements of both absolute and relative radial shaft vibration with regard to the monitoring of radial clearances, but excludes axial shaft vibration. The Vibration PPT covers all details on Vibration Measurement, Vibration Analysis and Control. See our Privacy Policy and User Agreement for details. There are two ISO recommendations concerning machine condition monitoring using this type of measurement; the much-used ISO 2372 and the more recent ISO 10816, which is a replacement of the older standard. But what if you need to quickly check something yourself? Vibration Measurement Techniques: Basics Introduction: Vibration is the back and forth or repetitive motion of an object from its point of rest. Vibration measurement is sometimes used as an indirect measurement of some other value. Since conclusions regarding machine condition - and hence whether or not money and human safety are risked - depend on the accuracy of measurements, we must be very careful how measurements are taken. A typical vibration measurement system includes a device to sense the vibration (accelerometer), and an instrument to measure the level of vibration. Vibration Transducers. Designxx. This book deals with such industrial and automotive noise and vibration, their measurement and control. The use of an FFT in our vibration analysis gave clues on what was causing the measured vibration. Over the last 15 or 20 years a whole new technology of vibration measurement has been developed which is suitable for investigating modern highly stressed, high speed machinery. Vibration Measurements Vibration Sensors Structural vibration is commonly measured with electronic sensors called accelerometers. Vibration monitoring and measuring equipment is vital for companies that use rotating equipment. This presentation gives the information about 'vibration measuring instruments' covering syllabus of Unit-5 of Theory of vibrations or mechanical vibrations for BE course under VTU, Belgaum. The inverse of a vibration frequency is referred to as the period (T), T=1/f. Broadband vibration measurement is the most widely used and cost-efficient method for the diagnosis of overall machine condition. This presentation is prepared by Hareesha N G, Asst. Its proprietary testing innovations include Field Data Replication, Fatigue Damage Spectrum, Kurtosion ® and Instant Degrees of Freedom ®. Print. Vibration Monitoring Equipment - RECOVIB - The RECOVIB® accelerometers are of proven design and the majority of the models available are widely used in a variety of fields, such as the machine tools, precision machining and on-shore and off-shore wind energy sectors in monitoring or active vibration control applications. The inverse of a vibration frequency is referred to as the period (T), T=1/f. Related titles. Amplitude or displacement is measured in mils peak-to-peak. technique used to identify and predict mechanical anomalies in industrial machinery Vibration PPT. 100% 100% found this document not useful, Mark this document as not useful. Measured parameters in the design of an actual vibration measurement are introduced, including the displacement, velocity, acceleration, wheel-rail contact force, and soil dynamic stress, etc. Vibration of Taut Strings and Longitudinal Vibration of Rod; Derivation of EOM by Hamilton 's Principle and Boundary Conditions; Solution of Wave Equation; Transverse vibration of Beams ; Continuous Systems: Approximate Solutions. Fastener Basics. Below you can check out our software lineup including Sine, Random, Shock, and Time Waveform Replication. Vibration analysis is defined as a process for measuring the vibration levels and frequencies of machinery and then using that information to analyze how healthy the machines and their components are. It is applicable to measurements of both absolute and relative radial shaft vibration with regard to the monitoring of radial clearances, but excludes axial shaft vibration. There are many types of accelerometers. Niraj Varia: 130800119551 High Impedance Accelerometer. If you continue browsing the site, you agree to the use of cookies on this website. There are two common ways to measure vibrations: 1. Vibration PPT. This presentation gives the information about 'vibration measuring instruments' covering syllabus of Unit-5 of Theory of vibrations or mechanical vibrations for BE course under VTU, Belgaum. The vibrations are desirable as well as undesirable. A laser Doppler vibrometer (LDV) is a scientific instrument that is used to make non-contact vibration measurements of a surface. Severity is a measure of how smooth or rough a vibration is, and frequency is an indicator of what is, or are, causing the vibration. Now customize the name of a clipboard to store your clips. Introduction • The primary purpose of the vibration measuring instrument is to give an output signal which represents the vibration phenomenon. The second column measures vibration severity in accordance with ANSI S2.41 in the low-frequency spectrum. ISO 7919-4:2009 establishes provisions for evaluating the severity of in-situ, broad-band shaft vibration measured radial (i.e. ISO 7919-4:2009 establishes provisions for evaluating the severity of in-situ, broad-band shaft vibration measured radial (i.e. 12-587-311. | PowerPoint PPT presentation | free to view . There are many types of accelerometers. Hareesha N Gowda, Dayananda Sagar College of Engg, Bangalore, Vibration monitoring and its features for corelation, No public clipboards found for this slide. The oscillations may be periodic, such as the motion of a pendulum—or random, such as the movement of a tire on a gravel road. Accelerometers are devices that measure the vibration, or acceleration of motion of a structure. Prof, DSCE, BLore-78. The oscillations may be periodic, such as the motion of a pendulum—or random, such as the movement of a tire on a gravel road. (virtual presentation) Frequently Asked Questions About Microphones & Acoustics. Simple Harmonic Motion Applications in Engineering Field. Vibration Standards. Vibration measurement can be achieved with a variety of vibration analysis and monitoring equipment. It provides us with the “big picture” of vibration by identifying the specific causes with the frequency and judging acceptability with the amplitude. Features. The implementation of machinery vibration analysis has been made practical by the develop-ment of analysis instruments called Dynamic Signal Analyzers (DSAs). PURPOSE and BACKGROUND . In many machines, the vibration is not part of its regular or intended operation and function, but rather it cannot be avoided. Vibration is measured either in terms of displacement, velocity or acceleration. The laser beam from the LDV is directed at the surface of interest, and the vibration amplitude and frequency are extracted from the Doppler shift of the reflected laser beam frequency due to the motion of the surface. The final measurement goal determines the approach to the measuring vibration.Often, condition monitoring– predicting or monitoring wear, fatigue, and failure – requires vibration measurements meant to determine the kinetic energy and forces acting upon an object . Vibration displacement is always measured as Peak to Peak, a measure of the total excursion of the rotor or machine casing in MILS or MICROMETERS. Included in the vibration PPT training series are full details explaining vibration data collection, vibration measurement, vibration analysis and machine vibration fault diagnosis. VERSION NUMBER: 1.0 DATE OF ISSUE: July 2011 . PRÜFTECHNIK has a long history of putting innovative techno-logical ideas into industrial maintenance practice - with the practical advantage for the user always foremost in mind. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Vibration Research is the leader in the field of vibration control. The accelerometer produces an electrical signal. Share . See our User Agreement and Privacy Policy. ISO 20816-1:2016 establishes general conditions and procedures for the measurement and evaluation of vibration using measurements made on rotating, non-rotating and non-reciprocating parts of complete machines. • Vibration measuring devices having mass, spring, dash pot, etc.