Selected articles from Brüel & Kjær Magazine


Brüel & Kjær Expands - Support of I-deas Test Products
Brüel & Kjær has entered into a partnership with the Canadian software development company, Maya HTT who purchased key NVH software products and active software maintenance contracts from MTS in February. Brüel & Kjær will be the exclusive sales and support channel for all the acquired products.
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Calibration – the Sure Way to Accurate Measurements
In addition to fulfilling industry requirements, calibration is about always being sure that your equipment produces valid results with known uncertainty.
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Bridging the University-Industry Gap to Design a Silent Aircraft
As airports try to lift operational restrictions and new sites get tied-up due to protests from airport-shy communities, manufacturers, operators, airlines and authorities strive to find a multilaterally viable solution to the noise problem.
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Developing I-deas
It is more than two years since Brüel & Kjær partnered with Maya Heat Transfer Technologies of Montreal to acquire the I-deas Test business from MTS Systems. In that time we have not stood still! We continue to develop and enhance the Test for I-deas products and improve the integration with the PULSE platform.
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A New DIRAC Measuring Speech Intelligibility
Speech intelligibility measurements in situations where there is a large distance between the receiver and the sound source require the source and receiver to operate independently. While this leads more often than not to practical conflicts, DIRAC 4.0 provides a unique solution.
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Enhanced Acoustic Material Testing in a Tube
With the release of PULSE™ 11, Brüel & Kjær continues to enhance its acoustic material testing solution by introducing new software for the measurement of transmission loss in a tube, and augmenting the range of acoustical properties determined.
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The Evolution behind a Revolutionary Surface Microphone
Ever since one of the company founders, Per V. Brüel, designed his first measuring microphone way back in 1945, Brüel & Kjær has pioneered innovative solutions for microphones and preamplifiers. The revolutionary Surface Microphone was designed and manufactured using this proud heritage of the well-proven Brüel & Kjær measurement microphones. But this is combined with new design principles (patent pending) taking microphone development into a whole new generation.
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Keeping Quiet About DCNS
Stealth and acoustic discretion are prime considerations that submariners have to contend with. The primary offensive and defensive power of a submarine lies in its ability to remain concealed in the depths of the ocean. Modern submarines are built with an emphasison stealth. Advanced propeller designs, extensive sound insulation, and special machinery allow a submarine to be as quiet as ambient ocean noise, making it extremely difficult to detect.
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National Aerospace Laboratories (CSIR) – Celebrating 50 Years of Excellence
India’s National Aerospace Laboratories (NAL), internationally recognised as a major centre for aerospace development activities, celebrate their 50th anniversary this year. For the last 40 years Brüel & Kjær has been supplying NAL with sound and vibration equipment, most recently with PULSE™ data acquisition and analysis systems.
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NASA Acts to Reduce Crawler Transporter Noise
The Crawler Transporter (CT), also known as “the mighty tortoise”, is the world’s largest tracked vehicle. It weighs 6 million pounds (2.7 million kg), is 131 ft (40 m) long and 113 ft (34 m) wide. It takes eleven people to drive a single crawler that has a top speed of less than 0.9 mph (1.5 km/h) when fully loaded. The Kennedy Space Center (KSC) in Florida, USA has two of these massive machines. They were originally designed and built for the Apollo program in the 1960s, but their function today is to move NASA’s space shuttles, complete with launch platforms, from the Vehicle Assembly Building to the launch pad. This 3.5 to 5.0 mile (5.6 to 8 km) journey takes about 8 hours.
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Good looks Are Not Enough

With its stringent exterior and interior noise testing programs, the FIAT Group gains competitive advantages in a market where customer satisfaction is the key to success. For its wind tunnel test programs, Brüel & Kjær is FIAT's preferred supplier covering the whole measurement chain – from microphones and accelerometers to the most advanced noisemapping solutions.


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From a Trucker’s Seat – The American Dream Comes True!
With its high focus on interior noise testing programs, Commercial Vehicle Group (CVG) gains competitive advantages in a market where driver comfort is not only an essential, but also a vital safety issue as well as a tool to improve driver retention. For its vibration and acoustic test programs, Brüel & Kjær is CVG’s preferred supplier of accelerometers and microphones as well as solutions for noise source identification, material testing, sound intensity and modal analysis.
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PULSE FRC – Frequency Response Correction Compensation is a Good Thing

For the commercial aviation industry, reducing aircraft noise a few tenths of a decibel can have an enormous impact. Acoustic insulation can be reduced, lowering weight, and thereby improving fuel economy while maintaining passenger comfort.


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PULSE Makes Explosive Readings
Building warships from composite materials and designing and building stealth submarines are specialities of Swedish defence shipbuilder Kockums AB. When designing these types of crafts, crucial demands are placed on their noise, vibration and shock response properties. To ensure that these stringent requirements are fulfilled, a thorough knowledge of structures and material properties is a prerequisite, backed up by extensive testing to validate the theoretical designs.
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PULSE Smart Start – A User’s Experience

With more than 8000 systems sold, PULSE is the world’s most popular data acquisition and analysis system. Despite this, we still went out and asked hundreds of customers, “How can we make the platform even better?” The answer – “Make it easier to set up!” So we did just that. The following story tells of Smart Start’s main features facilitating fast and easy setup.


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Putting the Surface Microphone through its Paces at Airbus
Based in Toulouse, France, Airbus is a global company with design and manufacturing facilities in France, Germany, the U.K. and Spain. The cooperation between the various entities that make up Airbus goes back to the 1920s. Its first aircraft A300B, which was launched at the 1969 Paris air show, was the world’s first wide body twinjet. It could comfortably carry 226 passengers.
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Transducers – “A Lifetime of Quality”
As many of you will know, in the world of physics a transducer is a device that accepts an input of energy in one form and produces an output of energy in some other form, with a known fixed relationship between the input and output. Transducers are used extensively in R&D and testing applications – for instance, to develop quieter, safer cars, to ensure that an aircraft and its engines are totally reliable and environmentally friendly, and that household appliances have low levels of noise and vibration. The list of applications where transducers are used is almost endless!
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Brüel & Kjær’s Vibration Check Systems Validated and Certified by Turbomeca
For many years, the levels of vibration on Turbomeca engines have been measured using a simple overall measurement in the frequency band 80 to 1000 Hz as stipulated in the Turbomeca Maintenance Manual. However, this method is unable to detect certain faults, and sometimes a helicopter could be grounded unnecessarily until an extensive test of the engine could be performed. FFT and order based analysis methods were introduced some years ago to improve the reliability of the diagnosis.
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Vibration Monitoring and Analysis in Aircraft Engine Test Cells

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Why Calibrate PULSE?
British scientist Lord Kelvin (William Thomson 1824 – 1907) said in his lecture to the Institution of Engineers, 3 May 1883, “I often say that when you can measure what you are speaking about and express it in numbers you know something about it; but when you cannot express it in some numbers your knowledge is a meagre and unsatisfactory kind; it may be the beginning of knowledge but you have scarcely, in your thoughts, advanced to the stage of science, whatever the matter maybe”.
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LAN-XI – One Cable Data Acquisition Propelled by Power over Ethernet (PoE) and Precision Timing Protocol (PTP)
Cabling multichannel measurement systems has always been a challenge. Running transducer cables, power cables, synchronisation cables and data transfer cables from control room to measurement position is difficult, time consuming and often a potential source of error and added noise. In fact, for most multichannel measurements the time spent on setting up the system is far longer than the actual measurement time! Being able to acquire data from many channels, synchronise measurements and power the front-end via just one cable, dramatically reduces the cost of system setup. We have achieved this with our LAN-XI Data Acquisition System using standard LAN with Power over Ethernet (PoE) and Precision Timing Protocol (PTP). This article describes the main technical aspects of the two technologies.
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MATRON 3 – Discreetly Serving the Community
Environmental anti-social behaviour is rife in all urban areas, and The London Borough of Hounslow is no exception. Covering 23 square miles, stretching from Heathrow Airport in the west to Chiswick in the east, it has population of 210,000, and features modern housing estates, quiet suburbs, green belt villages and bustling and fashionable cosmopolitan districts. During 2004/5, Hounslow Council received 3376 environmental noise complaints. Nine officers deal with Hounslow’s noise complaints and have, in the past, always used Brüel & Kjær’s MATRON Neighbour Noise Monitoring System for their investigations. By upgrading their systems to MATRON 3 (DAT-less) Neighbour Noise Monitoring System they’re finding that their investigations are easier and more accurate than ever.
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Implementation of EU Noise Policy in the Member States
All 25 Member States of the European Union have to ratify and implement the EUs Assessment & Management of Environmental Noise Directive 2002/49/EC. The first implementation deadline for Member States was 18th July 2004. What has happened in the Member States regarding implementation in legislation, and regarding mapping and action-planning activities? And what of pan-European methodological activities such as strategic mapping guidelines and calculation methods? This article gives the status at the time of writing (end of August).
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