Bombardier make turbo-prop aircraft in their Q-series that have an active noise and vibration control system to reduce the noise level inside the cabin. Their Noise and Vibration Suppression System (NVS) uses actively controlled tuned vibration absorbers attached to the fuselage to reduce the vibration, and hence reduces the noise transmitted into the cabin. The system was designed by Ultra-electronics.
Read more on the Bombardier web site.
Analog Devices has added more MEMs accelerometers to its product range. The ADXL203 is a two axis, low G accelerometer and the ADXL103 is the single axis version. Both accelerometers have a range of +/- 1.7 g and can measure both static and dynamic acceleration.
Read more on the Analog Devices web site.
Bruel and Kjaer have release two new software packages. Acoustic Determinator Type 7816 is a tool to calculate the sound power level of sources by measuring sound pressure levels in the field. Classifier is a PC-based software package for laboratory or field measurements of building acoustics using Brüel & Kjær’s PULSE version 7.x.
The Institute for Safe, Quiet, and Durable Highways(SQDH), at the Ray Herrick Laboratories at Purdue University has built a device to test the noise generated from pavement – tire interaction. The pavement is attached to a circular drum and a tire rotates over the curved pavement surface.
Read more on the Purdue University web site.
Lord Corporation, North Carolina USA, have successfully installed an Active Vibration Control system in the Hindustan Aeronautics Advanced Light Helicopter, otherwise known as the Indian DHRUV. The system uses active Frahms to monitor and reduce vibration in the fuselage generated by the main rotor and the rotor aerodynamics.
Read the press release on the Lord Corporation web site.
Causal Systems has released the latest version of ENC, Engineering Noise Control software. The software evaluates practically all of the expressions and algorithms in the book, Engineering Noise Control 2nd edition by
DA Bies and CH Hansen.
Order the software from Causal Systems.
Suss MicroTec and DELTA (Danish Electronics, Light and Acoustics) have created a website called Memunity that is dedicated to testing of microelectromechanical systems (MEMS). MEMUNITY and its members have techniques for testing MEMS accelerometers and microphones whilst they are still on the wafer.
Read more on the MEMUNITY web site.
Andromed has released an electronic stethoscope that has filtering to reduce ambient noise and noise generated by hand movement. It also has an auto-muting function that eliminates impact noise if the sensor is struck, or if the patient coughs.
Read more on the Andromed web site.
Innovative DSP have released a new DSP card for use with audio, vibration and sonar applications. The card has signal inputs for up to 32 channels at 24 bit resolution, up to 192kHz, and 6 analog outputs at 24 bit resolution. The card uses a Texas Instruments C6711 processor.
Read more on the Innovative DSP web site.
I’ve added a Classifieds section that contains job adverts that I have seen, or people have sent in. There are also For Sale and Wanted sections. If you want to sell anything related to acoustics or vibration, or have a job offer, you are welcome to put a notice here for free.