The Problem with Pulpers | Noise and Vibration Control
We were recently called in to assist in addressing a noise issue that was the result of a university’s desire to be more “green”. In this case, we were asked to assess the noise produced in the dish wash room of a university student union. This blog is the second of a two-part post about student union acoustics, and you may want to read the first blog on College Campuses and Student Union Acoustics before continuing. (more)
If It Sounds Like Noise to You, It May Be “Esion”
Fundamentally, sound is “that which we hear”. What we hear at any given time can greatly influence us. We use sound to communicate, to express warning, fear, pleasure and excitement. Some sounds can relax us and help us fall asleep, while other sounds can distract us and make it more difficult to perform simple tasks. Different sounds can be soothing and pleasing or annoying and irritating. Accordingly, determining “What is sound?” and “What is noise?” can become a highly subjective task. As engineers and scientists, it’s our job to generate generalized models that have a high level of correlation to humans (or to specific populations). (more)
Space Savers | Acoustical Engineering for Gymnatoriums and Cafetoriums
It certainly isn’t a new idea… How do we maximize our space and minimize our cost without the loss of function? Surely this is the major driver behind ideas like the gymnatorium or the cafetorium. We’ve all seen them, most likely they were in the schools that we attended. They consist of a stage at one end of the room or tucked away in the corner. So, do these budget savers really work like they are supposed to? (more)
When One Size Does Not Fit All | Diffuser Sound Levels
On a recent trip to India, I discovered a cute clothing sizing term called “free size” which is equivalent to “one size fits all”. Free size clothing must be a manufacturer’s delight since production and distribution are greatly simplified. Adjustments to the size of the garment are typically made through waist ties of various designs and if needed, permanent alterations.
In the A/E/C industry, diffuser, grille and register (air device) manufacturers have chosen the free size philosophy when it comes to providing sound data. (more)
My Scarlet Letter | Distractions in the Classroom
At Acoustics By Design we talk a lot about standards. Sometimes, the standards are hidden behind terms like design goals, baseline design, or even ordinances and specifications… But they are all standards. The reality is almost all aspects of our lives are governed by standards; regardless of how well they work or how well we adhere to them, we still use them in decision making. (more)
White Space Update for Wireless Microphones
Several months ago (10-13-08) I wrote about the current state of the wireless microphone frequency spectrum and how the actions of congress and the FCC are shaping the future of wireless technology. Well, several notable updates and changes have been made since that time. You may recall that February 17, 2009, was the date set for the transition to DTV (Digital TV). Congress (in all its wisdom) decided that it would extend the deadline to June 12, 2009. (more)
The Leaky Bucket | How Sound Escapes
Blocking sound is often analogized to plugging the holes in a leaky bucket. If you plug up all the bucket holes except one, the bucket is still going to drain. In acoustics, an outstanding partition design will not adequately block sound if holes and weak spots exist where sound can find its way through. (more)
How LEED V3 Changes Everything
It’s official! The all new LEED Version 3 has been launched by the U.S. Green Building Council. The new system makes several big changes that affect everyone from architects and engineers to builders and building owners. This information is especially important if you are working on a LEED project or if you are a LEED Accredited Professional. Here are some of the initial updates at a glance: (more)
How Green Design Can Save You Some Green $$$
It seems like every project that comes across my desk has a stated goal of attaining some level of LEED Certification (LEED Silver, Gold, Platinum, whatever). We’re talking K-12 schools, universities, healthcare facilities, churches – they’re all “going green.” But how much does all this stuff cost? And can green design really save you some green $$$? (more)
Elbows vs. Sound Attenuators: Interchangeable?
It is common belief that a series of elbows near an air handling unit (AHU) can accomplish the same insertion loss as a manufactured duct sound attenuator. It’s true that elbows are less expensive than sound attenuators, but what acoustical performance is really achieved with this “low cost” substitution?
Let’s compare the two designs. Using the tables presented in the 2007 ASHRAE Handbook – HVAC Applications, for any type of elbow (round, rectangular, acoustically lined or not), the width of an elbow (in the plane that it turns) must equal or exceed 30 inches to get ANY insertion loss at 63 Hz. A 30 inch wide elbow provides only 1 dB of insertion loss (IL) at 125 Hz . These two frequencies are typically of concern when reducing sound from AHUs.
2009 AIA Grand Valley Honor Award Winners
This past Saturday night we attended the 2009 AIA Grand Valley Honor Awards program at the Urban Institute of Contemporary Arts (UICA) in downtown Grand Rapids. As a Professional Affiliate Member of the AIA, our firm serves as consultants to architects. Although we are not eligible to receive an award, we look forward to the chance to support our friends and celebrate their accomplishments in architecture over the last year. In addition, Acoustics By Design was pleased to be the acoustical and audio/video design consultants for six of the nominated projects! The real surprise of the night was that the independent judges panel, made up of three distinguished architects from Iowa, declined to give out awards in several categories. (more)
It’s time for another semester, and I tell my architecture students that if there’s one thing they learn in my acoustics class, it’s that porous absorbers do not block sound. A porous sound absorber, by definition, has many tiny interconnected voids that sound travels through. Fiberglass and open cell foam are examples. The sound wave loses its energy through friction between the air particles and the fibers/void walls of the material it is passing through. (more)
Digital Signage Solutions for K-12 Schools
My wife teaches English to high school freshmen and seniors. It’s a good thing that she’s the one teaching them, because if it were me, I’d probably end up in a mental institution. The hard part about teaching teenagers is finding effective methods of communication. Sometimes it seems like they just don’t understand words. But there are things they do understand. High school teenagers understand images. They understand video. They understand multi-media, multi-sensory communication. This is one of the reasons why we at Acoustics By Design are seeing a significant uptick in Digital Signage system design for K-12 schools. (more)
Decision 2008 – White Space Disaster for Wireless Mics
Last Tuesday, while many of us were casting our votes in the presidential election, the Federal Communications Commission (FCC) was making a landmark decision of its own. On their private ballot was a proposal to open the so-called “TV White Spaces” of the frequency spectrum for expanded use. And on November 4th, the proposal passed. Sounds all fine and good, right? Well, maybe not. If the FCC’s current plan goes through, it will lead to a crossroads for the wireless microphone industry and for AV designers. (more)
It’s interesting to watch the broader culture around us as it adapts to new ideas and theories. The “Green” concept (the idea that we need to take care of the environment, reduce our carbon footprint, save energy, etc.) really isn’t new at all, but the mounting “buzz” around the word certainly is. When I was growing up, green was nothing more than my favorite color, but now it’s a top story in the news, a popular ad campaign, even a way of life. (more)
Beyond the Auditorium: Acoustics and LEED For Schools
When most people hear about the new Acoustic Standards in the LEED for Schools Rating System, their eyes start to glaze over like day-old Crispy Creams. With over thirty pages of detailed acoustical design criteria, the ANSI Standards are a force to be reckoned with. Today we will take a few moments to highlight the basic principles of acoustical design that will “LEED” to enhanced learning environments, happy school board officials, and of course…impressive LEED scores. (more)
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