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  • Brüel & Kjær
    whaling era 17th 20th century Evidence shows that disturbances are having a serious effect on the communication migration reproduction and other behavioural patterns of blue whales Blue whales are now listed as a protected species The right time place and tools Such an endeavour required a large amount of planning Dr Rasmussen chose Skjálfandy Bay in Northeast Iceland as the best area to conduct the research it is easy to get to close to shore and Iceland s round the clock daylight meant that the research team could go out very early in the morning long before the whale watching boats started up their engines There is also only a very small four week window in June when blue whales are typically sighted in the bay if at all Blue whales move at their own pace and you can never predict when they will appear or for how long As such a two and a half week period was carefully chosen to make best use of this limited timeframe Fortunately Dr Rasmussen has broad experience in marine research using hydrophone arrays to record beam patterns and sound levels so she was well prepared for the technicalities involved In 2000 she had been part of a similar project in Andenes in Northern Norway that recorded the sounds made by sperm whales using Type 8101 hydrophones from Brüel Kjær The project had been a great success and so it was a natural decision to use the same equipment again for Project Blue Whale Three of the sailing vessels used for the project Gogo from Iceland Thoe from Belgium and Roxy from Denmark To record the whales a digital recorder was custom made at Aarhus University and specially configured to be able to capture sound on one channel and to give an accurate GPS signal reading on the other for precise localization data Fishing for data With everything ready in good time 4 boats and 28 people set out at midnight on 19 June 2015 to begin the first recording The team included Dr Rasmussen who was leading the project and other specialists from the University of Southern Denmark Odense University in Denmark University of Veterinary Medicine Hannover as well as some PhD and Masters students whale watcher crews and boat crews However even with the most meticulous planning the success of the project was still at the mercy of forces beyond anyone s control Since 2008 acoustic tagging and photo identification research work had confirmed that blue whales go to Skjálfandy Bay in June but there were no guarantees at all that they would return It was also essential for the weather to be on their side To get accurate recordings the team needed calm seas and no wind otherwise the subsequent waves and cable strumming noise from the hydrophone cables would cause additional noise interference that would render the results useless Low frequency localization method The frequencies of interest are as low as 10 20 Hz In order to achieve any

    Original URL path: http://www.bksv.it/NewsEvents/Waves/Articles/2015/diving-deeper-into-the-sound-of-blue-whales (2016-02-17)
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  • Brüel & Kjær
    Pieter Calmeyn NVH specialist New Holland A GPS capability in the data acquisition hardware makes this possible This also implants a highly accurate time stamp in the sound and vibration data Because it is a common time signal it allows precise synchronization with other datasets like the vehicle s own CAN Bus data Therefore engineers can correlate machine parameters like engine speed hydraulic pressure and hydromotors with sound peaks measured outside To further drill down into details New Holland mounts microphones and accelerometers on the vehicle and synchronizes them with the pass by data giving very detailed correlations between specific components and the acoustic levels where the legal limit is measured I can extract components easily says Pieter I make a source path contribution analysis based on the frequency spectrum and then extract the orders related to a component Daily harvesting capacity has increased considerably over the last ten years but the actual speed on the field has not changed much 5 6 km h is an optimal speed when balanced with the concentration needed to handle a harvesting machine The best mitigation strategy is to resolve noisy components which might be the diesel engine a specific hydromotor or hydraulic pump In some cases designers can select an alternative sub supplier or take a component from another machine which also avoids field proving it Another strategy is to interrupt the noise s path through the structure They can also use noise shielding though field trials can prove too demanding Integrated testing snowballs The key is to try out different ideas and alternatives and assess their effect on pass by noise In a little over a year New Holland has performed 600 such tests But more important than the amount is the level of interpretation this means explains Pieter Before designers had a certain noise level to work with Now we give them specific components or paths that are problematic A better interpretation of their design at the beginning of a project is a great advantage Comfort reduces the driver s fatigue and New Holland s Harvest Suite cab leads the market with a 73 dB A noise level thanks to significant investigations into glass layups combined with frequency optimized materials With detailed information departments can collaborate more effectively As Pieter says One redesign of a drivetrain cog together with our simulation department reduced noise by 7 dB because we could pass on precise identification and sound frequency components to the FE modelling department Moreover as such test outcomes generate awareness throughout New Holland a snowballing effect brings ever more test requests One redesign of a drivetrain cog together with our simulation department reduced noise by 7 dB because we could pass on precise identification and sound frequency components to the FE finite element modelling department Pieter Calmeyn NVH specialist New Holland Such valuable test integration is necessary to meet the challenging noise limits at faster road speeds and according to Pieter his equipment is key The tools are getting better

    Original URL path: http://www.bksv.it/NewsEvents/Waves/Articles/2015/cutting-the-commute (2016-02-17)
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  • Brüel & Kjær
    to complain about excessive noise levels or unusual aircraft activity For M A G s Environment Department this is where the long term value of ANOMS 9 truly lies By having highly accurate real time and historical information about the position speed height and noise of each aircraft the Community Relations team can process and respond to complaints quickly and with transparency which is an important factor to build trust within the local community The project has benefitted from our long relationship with Brüel Kjær It was delivered in a way that allowed us to maintain our monitoring and reporting capabilities while providing opportunities for users to fully understand the system Tim Walmsley Environmental Manager Manchester Airport WebTrak and WebTrak MyNeighbourhood Like every airport worldwide M A G s Environment Teams receive complaints or enquiries ranging from where aircraft fly to the noise generated on departure or arrival to flight route changes even to general questions about how the airport operates By using a system that can automatically pull in these enquiries log them in a database and reply quickly and informatively the process becomes far more time and cost efficient and people feel that their concerns are being heard responded to and genuinely taken into consideration However if people are also able to self investigate the nature of their enquiry by checking detailed flight track data down to aircraft type number altitude flight track holding patterns distance to any point on the map and the actual noise levels they can see for themselves whether they are justified in complaining before taking any action If not then not only have they saved their own time and trouble but the load on the airport s Community Relations team becomes significantly lighter This is precisely what the public facing side of ANOMS 9 a community engagement portal known as WebTrak provides Designed to help facilitate dialogue as well as give flight information WebTrak is an essential tool for anyone who wants to understand more about their airport s activity or as a way of quickly easily and directly making a complaint if necessary WebTrak MyNeighbourhood provides a slightly different perspective by allowing people to look more closely at flight trends and statistics rather than just at individual aircraft activity This enables people to look deeper into the impact of an airport on their specific neighbourhood by summarising data over long periods helping them to get a more comprehensive overview of what sort of noise levels they can expect Value beyond measure Right now everything is in place and the system has been launched across the group with great success M A G is safely covered by a 5 year support contract with Brüel Kjær that covers all system hosting and maintenance including verification of radar data and the upkeep of all noise management terminals One additional and notable benefit that M A G also receives from this hosting agreement is system updates Brüel Kjær manages systems for a large number of airports

    Original URL path: http://www.bksv.it/NewsEvents/Waves/Articles/2015/bringing-communities-on-board (2016-02-17)
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  • Brüel & Kjær
    preference Putting theory into reality With this initial goal reached we were then able to leverage what we had learned about defining measuring and analyzing sound quality and use it to support the development of a new sound quality model design specifically the exhaust system of our new line of LP Gas forklift trucks At this stage we were confident in our ability to put these new techniques into practice with Brüel Kjær and Sound Answers standing by to help us optimize the final design Immediately we were able to make full use of our new knowledge and tools by running data through our Sound Quality Preference Equation we could rank and analyze competitor products and set clear parameters for our own product s sound quality target and design Then in order to correlate visualize and audition the test data a 3D CAE model of the new exhaust system design was built using MSC Actran acoustics software In combination with Brüel Kjær s NVH post processing software Actran was able to simulate a working 3D model of our exhaust system that could display the mechanical acoustic and aeroacoustic characteristics of the system along with its internal gas flow I see a growing trend toward stricter market regulation of noise and vibration exposure globally particularly in the EU and increasingly in the US Ron Ziegler This enabled us to accurately predict and listen to how the final product would sound and behave under a wide variety of conditions Once we were satisfied with the CAE model design we were able to move forward with a physical prototype This allowed us to correlate the test results from the virtual and physical model and refine the design to bring the exhaust noise even closer to our Target Sound As an important part of this Brüel Kjær s Low Frequency Sound Source tool was used to measure the transmission loss which revealed how close our virtual model was to its physical counterpart All this data could be correlated back to the Actran model to continue improving and optimizing the sound and each time the model was updated the results could be run through the Sound Quality Preference Equation to determine their impact Both indoors and out sound can be an important customer consideration A final prototype was then built using the improved design from the updated Actran CAE model Once it had been installed on a forklift truck the entire project team including those from Crown Brüel Kjær Sound Answers and MSC Software each reviewed its performance in person for any final refinements The unanimous decision was that the new exhaust system was a significant improvement over the previous design an opinion that has since been widely affirmed across all our engineering teams A Crowning achievement All of us at Crown have greatly valued Brüel Kjær s and Sound Answers roles in helping us to gain a firm understanding of how sound quality plays a vital part in product development and how best to

    Original URL path: http://www.bksv.it/NewsEvents/Waves/Articles/2015/uplifting-sound-quality (2016-02-17)
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  • Brüel & Kjær
    pressure levels greater than those emitted at rock concerts Using echolocation to find prey bats emit high pitched sounds which at close range can exceed 140 dB a loud rock concert by comparison measures 115 to 120 dB just under the threshold of pain for humans Beat it The male Caribbean white lipped frog does more than just sing to attract mates It likes to chirp when sitting with its rear end buried in the mud and its head and front legs just above the ground With each chirp its vocal sacs expand and contract hitting the ground and producing an accompanying vibration These thumps can be felt 3 to 6 metres away Stomp Vibrations created by a stomping elephant can travel 32 km through the ground This social creature also receives messages through its feet a warning a greeting or a Let s go And at 80 to 90 dB this is louder than most humans can shout Elephants stomp louder than most humans can shout Head bangers Signals that rely on hearing and seeing aren t much use in the dark underground burrow of a mole rat However vibrations travel well through the ground so some species of mole rats such as the African Demon mole rat have taken to head banging In fact the first mammal documented for vibrational communication was indeed the Middle East blind mole rat which knocks its head against the walls of its tunnels to signal to its rodent neighbours Drumming up a fuss If a predator for example an aardvark approaches an African termite mound chains of drumming termite soldiers will head bang an alarm Even though they bang their heads on the ground at a rapid 11 times a second the vibration only travels around 38 cm but fellow termites close by will respond by drumming their heads too This chain reaction raises the alarm throughout the colony The foot percussionist Reminiscent of Disney s Thumper the solitary and nocturnal banner tailed kangaroo rat foot drums to communicate in a number of situations during courtship to signal territory and when encountering snakes This could be to warn its vulnerable young of the approaching predator or simply to alert the snake to the fact that its attempt at an ambush has been foiled All about the bass Not only the largest mammal the blue whale is also the loudest mammal on Earth with vocalizations that reach 188 dB a jet reaches only 140 dB Its low frequency rumbling sounds some below the range of human hearing have been recorded more than 800 km away Diving deeper into the sound of blue whales Search SIGN UP Printed magazine Waves newsletter CONTACT Email us RELATED ARTICLES Diving deeper into the sound of blue whales The loudest sound naturally Stampa Home Settori di mercato Gestione dell ambiente Aeroportuale Managing Airport Noise Managing Emissions Stakeholder Engagement Aerospaziale Airframes Aero Engines Automotive Veicoli terrestri Target setting Benchmarking and Troubleshooting Quality Development Production Line Testing The Application Research

    Original URL path: http://www.bksv.it/NewsEvents/Waves/Articles/2015/fauna-philharmonics (2016-02-17)
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  • Brüel & Kjær
    male dominated industry I have had to fight to rise above being mostly considered the wife even though I am the highest ranking officer But with strong female role models growing up and a husband of nearly forty years who she describes as gender blind in every aspect of his life she has paved the way for today s fiercely determined women A woman can elicit a receptive state of mind from a man as long as he doesn t feel emasculated Our nurturing nature can make us great managers and leaders and if a woman decides she wants something she can be relentless in the pursuit of her goal Orchestrating the right notes is challenging and exciting and we gain great satisfaction delivering the right sound quality Alyse Borla Her advice for women at the start of their careers Don t settle but rather strive for excellence in every aspect of your life because you can have it all if you are willing to take responsibility confront obstacles and work hard I am living my dream says Alyse Why waste your time and energy with excuses and roadblocks when there is so much happiness and fulfillment out there to grab and enjoy My business and my family are my passions Oh yes and there must be dancing The acoustician Dr Helen Ule PEng Vice President and Business Manager Akoustik Engineering Limited Areas of expertise Psychoacoustics and sound quality structural modal analysis measurement and analysis of community noise impacts from airports environmental noise and vibration analysis As a child intrigued by space and future exploration Helen Ule wanted to be an astronaut Realizing that this was unrealistic she turned to maths and science culminating in the highest echelon of her profession a doctorate degree in engineering This opened up the opportunities for me to partner in my own company in the field of noise and vibration consulting An accomplished musician Helen recalls that Music has always been part of my life Going into acoustics was a natural transition Part of the appeal was also the fact that there were less acousticians than for example automotive engineers This suggested to me that there is something very special about being an acoustician I always like being on the fringe of being a bit out there Her dream is to expand her company in terms of the types of consulting jobs and number of employees While I very much enjoy the hands on components of taking measurements and processing data I realize that for the company to grow I need to mentor the younger engineers and pass my experience on to them My philosophy is if you want to get a task done sooner rather than later you give it to a busy person Dr Helen Ule For Helen education is key I have encountered school guidance counsellors who have advised young women to not focus on science and mathematics But they should not limit their education and potentially close doors by not

    Original URL path: http://www.bksv.it/NewsEvents/Waves/Articles/2015/women-in-sound-and-vibration (2016-02-17)
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  • Brüel & Kjær
    up to global business Ghana Raising the standard calibration to boost industry In Ghana the Council for Scientific and Industrial Research CSIR has acquired Brüel Kjær calibration systems The acquisition is part of an initiative funded by the European Union EU to boost business development in Ghana Ghana located in West Africa has witnessed annual economic growth averaging over 6 4 since 2000 which is largely driven by expanding service and industrial sectors The start of oil production in 2010 has the potential of transforming the economy The President of Ghana Academy of Arts and Sciences Professor Francis Allotey states Modern science technology and innovation enterprise is expensive but a necessary investment for the future The Government of Ghana s agenda is to use science technology and innovation as the driving forces towards the economic development of the nation but according to CSIR Ghana s scientific institutions are struggling with challenges such as obsolete scientific equipment and inadequate training In 2011 the EU and the Republic of Ghana initiated a traderelated assistance programme Among others the programme focuses on the basic step of implementing the national quality policy covering areas such as metrology accreditation standardization conformity certification and regulation The acquired calibration systems will function within the Institute of Industrial Research CSIR IIR a leading institute of CSIR The mission is to drive national development and global competitiveness in industry through research into process and product development and promotion of scientific instrumentation and calibration The central quality control services will soon be in place and the hard work to establish a market for calibration in relatively new export oriented industries can begin Macedonia The Technical Manager of Laboratory for Electrical Quantities Mrs Stanislava Kroneva Petrovska and a colleague in the new acoustics laboratory at Bureau of Metrology in the Republic of Macedonia Acoustics laboratory supports market integration In 2014 the national Bureau of Metrology BoM in the Former Yugoslav Republic of Macedonia acquired Brüel Kjær calibration systems to establish a national acoustics laboratory The Republic of Macedonia located in south eastern Europe and with a population of just above two million is applying for membership of the European Union EU In 2011 2012 the Macedonian government and EU implemented a joint project to build up the capacities of BoM in relation to scientific and industrial metrology and to harmonize Macedonia s relevant legislation with that of the EU The Economy Minister of the Republic of Macedonia Valon Saraqini has stressed that the project contributes to free movement of goods Its implementation lays out a structure for quality and a developed metrology system meaning that all technical barriers for functioning trade have been lifted The break up of Yugoslavia in 1991 led to the dissolution of the federal metrology infrastructure As a result all republics had to establish their own standardization and metrology institutions In 2002 the Macedonian government adopted a Law on Metrology adequately harmonized with EU requirements In 2004 BoM started its operational activities and began to set up

    Original URL path: http://www.bksv.it/NewsEvents/Waves/Articles/2015/calibration-is-key-to-trust-and-trade (2016-02-17)
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  • Brüel & Kjær
    began to re issue his old recordings with better definition Then we did our first jazz record using single point micing That s what launched Chesky Records in 1988 When you started out did you have the expertise you needed We had a lot of knowledge but nobody had ever done this so we were always experimenting learning on the job Take Lars David s HATS I guess he was made to test automobiles or factories or whatever it s a measuring microphone but we found it so good that we use it for music It s a non stop learning process And you can never feel 100 per cent sure of yourself you re always nervous because you never know if the balance will come out right With a measurement microphone you must be getting a better signal than anyone out there Yeah we are We make records for people who are really into music wanna hear every detail And we use your mic because it gives us that It reaches out and gives us every last ounce of resolution and tone and purity we can get But you have to learn how to use it there are some tricks to using the mic for music But they re the recipe that we don t give out They re our secret sauce Photo Alan Nahigian How critical is capturing tone and ambience jazz musician practices his whole life to get a great tone out of his saxophone Anyone can pick up a score and read it but the tone is the poetry of the music And by capturing it you re able to be a magician in a way to bring you closer to the experience We want to bring you as close as we can to that musician I want you to hear the rosin on the bow I want you to hear the people breathing I want you to hear that woodiness of the violin What does the future hold for music recording and playback We ll evolve into virtual reality We ll meld with virtual reality glasses to put us in a virtual space When my children grow up they could live in Tahiti and stream a concert live from Berlin And they re gonna be in the concert hall they re gonna look around look up and down and the music will track them wherever they are People are gonna look at speakers like we do now at those wind up gramophones They re gonna think this is ridiculous two little boxes I m not in the event People will want to be immersed in the sound field Do you ever get away from music or is it always there It s always there but I do sports I like hiking and kayak racing and bike riding When you do music all day it becomes a job and it s stressful I still listen to music when I come home though I like to put

    Original URL path: http://www.bksv.it/NewsEvents/Waves/Articles/2015/the-conductors-point-of-view (2016-02-17)
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