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Asia Noise News Building Accoustics

Ever wondered what is the sound absorption of your absorber in situ?

Ever wondered what is the sound absorption of your absorber in situ?

SONOCAT 

A multifunctional acoustic device for in-situ measurements. 

Sound absorption of a material can now be measured in the field. It is well known that, normally, sound absorption measurement needs to be done in a reverberant sound field and controlled environment such as a reverberation chamber referred to the traditional method, for example, ISO 354. The reason is the measurement method relies on the sound field inside a reverberation chamber which cannot be obtained in situ 

Sonocat measures 3D sound waves, meaning that the equipment can distinguish between the incident wave, reflected wave, and the total or the active sound wave. This overcomes the limit of relying on the sound field when measuring sound absorption and sound transmission loss, allowing the acousticians to investigate these acoustic parameters in the field. 

Peeters, F., Peeters, B., & Wijnant, Y. (2016). Determination of Acoustic Properties of Noise Barriers.

Sonocat can be useful in many cases, for example, when the test object cannot fit in the facilities or when it’s already installed at the site. Imagine a noise barrier that has been next to the highway for ten years, and the acoustic engineer needs to inspect whether the performance is still well-maintained. It won’t be possible to move the barrier to a lab, this is when in-situ measurement devices become handy. The engineer will be able to inspect the current performance of the absorption material inside the barrier as well as the sound transmission loss of the barrier, they can also use this to study the life span and plan for their next maintenance.  

With the capability of measuring 3D sound waves, Sonocat can also be used to locate the sound source or the leakage point. This can be useful for those who work in the automotive industry, for example, inspecting the vehicle to find the correct spot that causes noise intrusion problems and deciding the most effective solution. 

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Asia Noise News

RION Co., Ltd. Thailand Representative Office is established!

On October 1st, RION Co., Ltd. Thailand Representative Office has been established in Sai Mai area of Bangkok!

This establishment will enable us to provide even faster and more detailed support to our Thai customers.

If you have any problems with sound level meters or vibration meters, please feel free to contact us.

Address

 

6/54-56, Poemsin Road Soi 42 Sai Mai, 10220 Bangkok Thailand

Categories
Asia Noise News

Brunei, Sabah: Mystery blast heard, early signs point to sonic boom or meteorite

Mysterious explosion heard in Sipitang, Labuan, Lawas (Sarawak) might originate from a sonic boom high in the skies...

KOTA KINABALU: The mysterious explosion heard by many in Sipitang, Labuan, Lawas (Sarawak), and parts close to these areas on Sunday (Jan 31) could have been a sonic boom or a meteorite which exploded in mid-air.

The Astronomical Society of Brunei Darussalam (PABD) said it received numerous reports from Bruneians who also heard the mysterious loud noise.

The PABD then issued a notice seeking eyewitness accounts of the phenomenon, which is believed to have occurred at about 11 am.

Some Bruneians later shared their experiences and uploaded blurry pictures of what appears to be a fireball trailing smoke to PABD’s Facebook page.

A Sabahan in Brunei, Joey Yong, said she heard something like extremely loud thunder but did not know what it was.

The accounts from these witnesses may be found here.

Earlier, authorities in Sabah, including the navy, police and fire brigade, said they did not receive reports of any incidents that could have caused the blast.

Sabah Meteorological Department director Amir Zudi Hashim said the department did not record any seismic activity that could have caused the sound.

Sonic boom cause of explosion like noise Sabah

 

People in Sabah who claimed to have heard the blast said they felt the earth shake when the explosion was heard.

Source

 
 
Categories
Asia Noise News

Malaysian man apologises for making 11 speed bumps near his home

Malaysian man apologises for making 11 speed bumps near his home

BESUT (THE STAR/ASIA NEWS NETWORK) – A man who illegally installed 11 asphalt speed bumps on the street next to his house in Kampung Padang Luas, Jertih, has apologised for his action.

Mr Nor Muhamad Roslam Harun, 40, admitted his mistake in building so many speed bumps on a 40m stretch and causing a hassle to other residents.

“Police officers came to see me on Wednesday morning and asked me to remove all the speed bumps that I had installed.

“So I hired a bulldozer operator to remove all the speed bumps on the street, including the two original ones,” he told Bernama.

The case went viral on social media a few days ago after a man uploaded a picture of the “new speed bumps” on the street leading to his house, which he claimed had been installed by his neighbour.

Mr Nor Muhamad said he installed the speed bumps because he was often disturbed by the noise of passing vehicles.

“The noise from cars and motorcycles disrupts my sleep. I’m so stressed out and I also have other health issues.

“Actually, I wanted to make speed ‘humps’, but the asphalt hardened so quickly before they could be flattened, causing them to become bumps.

“This made the road inaccessible to all cars except four-wheel drives,” he said.

Mr Nor Muhamad revealed that he spent RM1,080 (S$355) of his Employees Provident Fund i-Sinar money to install the speed bumps.

Categories
Asia Noise News

Soundscape Under Covid-19

Many around the world are experiencing life with very low noise levels due to restrictions as we are confined to our home and there is a decrease in the industrial, transportation and leisure activity. This provides a wonderful opportunity to quantify and record for the future the lower noise levels of our soundscapes. With the reduction in shipping there is also a change in the underwater soundscapes.

Nowadays there are a high number of noise monitoring systems (noise monitoring terminals, city wide systems, underwater systems etc.) installed all over the world which will capture this information for the future. However, there are many acousticians working from home with access to a sound level meter that can be used to capture the soundscape from their balcony or from their garden and compare the before and after the restrictions.

The IYS 2020 committee has provided a central contact between a number around the world who were thinking similarly that there would be some benefit in coordination and a little standardization in the capture of the data. Marçal Serra from CESVA has taken a lead to set up a LinkedIn group COVID-19 Noise Reduction (at www.linkedin.com/groups/13844820/) and with hashtag #COVID19NoiseReduction for any posts.

The following is a general structure for those who wish to participate and share their data in the future. But do not break your confinement to report this data!

  • Place: Country and city (e.g., Spain village near Barcelona)
  • Primary noise source: (e.g., Traffic noise: note number of lanes per direction or Social noise: note if café/bar/restaurant/sporting)
  • Noise measuring system: The noise measuring system used to measure LduringLbefore, and Lafter
  • Noise level during COVID-19 confinement: Lduring, expressed as a weighted overall level (preferably LAeq,1 hour), spectrum or psychoacoustic metrics as Loudness. It could also be reported as an image of the noise time history or a weekly color map and/or compiled into a report/article/conference paper with the measurement details and the comparison data
  • Noise level before & after COVID-19 confinement: Lbefore & Lafter, expressed in the same way as Lduring and over the same time period.