vibration frequency monitoring Articles

  • HAV mis-measurement – to no standards whatsoever…

    Misunderstanding Hand Arm Vibration monitoring marketing material can put hands and safety policies at risk. Caveat emptor. We are regularly asked about new vibration measurement technology, particularly re the latest hand-held, glove or wrist mounted transducers that are presented as the latest assessment improvements. Whilst they may be useful tools, unfortunately some claims have been ...

  • Vibration monitoring and analysis in aircraft engine test cells

    Snecma, part of the SAFRAN group, is dedicated to the production of engines for both air and space. Working alone or in partnership, Snecma designs, develops and produces engines for civil and military aircraft, launch vehicles and satellites. The company is organised in three divisions: Commercial Engines – Snecma and GE Transportation team up to produce the bestselling family of CFM56 ...

  • Opening the envelope on bearing vibration

    A sophisticated signal processing technique can help to pinpoint bearing failure at an early stage. Chris Hansford, Managing Director at Hansford Sensors, explains. Experienced operators can often tell if a machine is not working properly, on the basis that is does not ‘sound right’. The same principle can be applied – using modern electronics – to identify the exact cause ...


    By Hansford Sensors

  • PULSE FRC – frequency response correction compensation is a good thing

    Furthermore, increased flight operations can be conducted around more restrictive airports. The determination of an aircraft type’s noise is a complex process guided by documents such as: International Civil Aviation Organization(ICAO) Annex 16 – Environmental Protection, Volume I – Aircraft Noise Federal Aviation Administration (FAA)CFR14 PART 36 – Noise ...

  • Performance of damage detection algorithms for health monitoring of joints in steel frame structures using vibration–based techniques

    Steel frame structures are widely used for industrial buildings, bridges, off–shore structures, etc., due to their high reliability and less construction time. In these types of structures, beams and columns are often connected by welding or fasteners forming rigid joints. In this study, viability of several damage detection algorithms for health monitoring of joints in planar frame structures ...


    By Inderscience Publishers

  • Field measurements and assessment of vibration serviceability of as–built long–span concrete floor

    Vertical vibration serviceability of an as–built concrete floor, whose 41.55 m span is currently the longest in China, are investigated in this paper by field measurements and numerical analysis. A vibration monitoring system were designed and installed on the floor. Different types of human–induced excitation are simulated such as single person walking, multi–person walking at the same pace ...


    By Inderscience Publishers

  • Vibration-based approach to lifetime prediction of electric motors for reuse

    This paper is concerned with lifetime prediction of components in washing machines. Vibration signals were measured on electric motors during an accelerated lifetime test ranging from 26.7 to 38.5 simulated years. Loose bearings have initiated air-gap eccentricity and rotor-to-stator rubbing, which resulted in a motor breakdown. Significant frequency bands were identified using a spectral ...


    By Inderscience Publishers

  • Brüel & Kjær’s vibration check systems validated and certified by Turbomeca

    Since 2002, Brüel & Kjær has been working very closely with Turbomeca to develop dedicated Vibration Check systems for helicopter engines, measured on the aircraft on the ground during engine run-up. This has resulted in a range of standard systems that can be used for measurements on virtually all Turbomeca engines used on helicopters. Turbomeca has issued Service Letters to ...

  • Case study - Monitoring landfill gas

    Infrared absorption Infrared absorption is usually the preferred method for measuring methane and carbon dioxide. Most gases absorb radiation in the infrared region. The wavelength of radiation that is absorbed is determined by the natural vibration frequencies of the molecule. These natural frequencies will depend on several factors. Thus different gas molecules have different natural ...


    By Geotech

  • Food industry: Monitoring a fan imbalance - Case Study

    Equipment, Context: The Plant is located in Northern Europe, producing amino acids amongst other products. The site is operating 24/7 all year long. The fan (impeller) is supplying drying process with hot air. Fan is unique and doesn’t receive a deep prediction system or strategy. Fan bearing housing is equipped with a vibration ...


    By Wi-Care

  • New Condition Monitoring and Analysis System VDAU-6000

    Brüel & Kjær Vibro announces the world-wide release of the new VDAU-6000. This state-of-the-art condition monitoring system provides an economical alternative to rack-based systems for condition monitoring of rotating machinery, in particular auxiliary machines and balance-of-plant applications. The high density 16-channel parallel processing functionality also lends itself to the ...


    By Brüel & Kjær Vibro GmbH

  • Airbus Helicopters: Monitoring gearboxes with HUMS accelerometers case study

    Airbus Helicopters needed highly robust, flight-certified accelerometers for permanent monitoring of gearboxes to be quickly designed and delivered. Challenge For helicopters, one of the most dangerous possible scenarios – worse than engine failure – is gearbox failure. Quality vibration monitoring is needed to ensure gearbox health and predict failures, while absolute ...

  • Petrochemistry: Monitoring the magnetic clutch of a boiler fan - Case Study

    Equipment, Context:   The manufacturing site is a steam cracker in Europe operating 24 hours 7 days a week. To ensure its production, the plant has three boilers supplying in vapor several steam turbines and furnaces. The monitored equipment is a fan linked to a boiler. Fan is equipped with a magnetic-clutch allowing a driving ...


    By Wi-Care

  • Case Study: Glastonbury Festival - Noise Monitoring At Glastonbury Festival

    In 1970, an entrance fee of just 1.00 would have permitted you, and about another 1500 'free spirits' to enjoy a weekend of listening to the likes of Quintessence, Marc Bolan and T-Rex, while at the same time savouring the undoubted 'delights' of free raw milk!! Almost three decades later, and at slightly greater expense, you and over 100,000 other people can now enjoy the delights and unique ...

  • Minimum and Maximum Densities of Granular Materials

    Laboratory tests were conducted to determine minimum and maximum densities of arroyo sand, concrete sand, Ottawa sand, and glass beads. Minimum densities were determined by six different methods using two different molds. Maximum density tests were performed using an electromagnetic vibrator producing vertical simple harmonic motion. The vibration parameters investigated were frequency, ...


    By ASTM International

  • Bearing fault severity estimation using time–based descriptors for rotating electric machines

    This paper evaluates the bearing fault severity in rotating electric machines based on the time–based descriptors derived from machine vibration signal. Time–based descriptors are independent of bearing dimensions and machine dynamics. To establish the relationship between the time–based descriptor and bearing fault severity, a wide range of defective bearings are examined on an experimental ...


    By Inderscience Publishers

  • Case study - Fred Hartman Bridge - Harris County, Texas

    Service: SoundPrint - Bridges Client: Texas Department of Transportation (TxDOT) Project Date: 2002 Type of Bridge: Fan arranged cable-stayed bridge Length: 4.185 kilometres (2.60 mi) The Fred Hartman Bridge was opened to traffic in 1995 and is one of the largest cable stayed bridges in the United States. The cable stayed bridge portion of the bridge ...


    By Pure Technologies

  • Vibratory drums: two-mass vs. brute force drives

    Vibrating drums are designed using two drive designs, direct drive and two-mass. General Kinematics has had decades of experience designing both types of drive configurations, and is the exclusive manufacturer of two-mass vibratory foundry drums under US patent #'s 4,960,162, RE33,542, 5,512,008, and 5,591,074. Experience has shown two-mass vibratory drums out perform direct drive designs in all ...


    By General Kinematics

  • PULSE smart start – a user’s experience

    Measuring on a Grounded Aeroplane   In the early days of PULSE, a team from Brüel & Kjær had the opportunity of performing a ground test on a Boeing 767. The left engine of the aeroplane had undergone a scheduled overhaul. The engine was reassembled and verified in a test cell. Everything seemed fine. The engine was mounted on the aeroplane and the aeroplane was ...

  • New Xtreme® metal detector from Eriez® raises industry bar in terms of superior sensitivity, ease of use and reliability

    Eriez Europe, UK manufacturer based in Caerphilly, South Wales, introduces the new Xtreme® Metal Detector, which surpasses previous units and competitive models alike with enhanced features, improved sensitivity and intuitive operation. The ultra-sleek Xtreme Metal Detector combines simplicity and sophistication with its easy-to-navigate control with extra-large colour interface. ...


    By Eriez Magnetics Europe Ltd

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