Bruel & Kjaer UK Ltd. - PRODUCT NEWS

Sound quality testing taken to a new level.
Brüel & Kjær tools used for research and development of Sound Quality in Lifts.

Brüel & Kjær’s Head and Torso Simulator (HATS), binaural microphones and PULSE Sound Quality software were used to analyse the sound quality behaviour of different types of Orona lifts, to correlate the sound quality with the different noise sources and to study the most appropriate ways to improve lift comfort.

Orona S. Coop. (manufacturer of lifts), Mondragon Goi Eskola Politeknikoa (MGEP) S. Coop. (Engineering Faculty of Mondragon University) and Ikerlan S. Coop. (Research Centre) have formed a consortium and established a stable working group of engineers to investigate the Sound Quality in Orona’s lifts.

Orona started the sound quality project with the aim of increasing the comfort of passenger lifts. According to Unai Galfarsoro, the coordinator of the Acoustic and Vibration Group at Mondragon University: “The reason of establishing the sound quality project is the need to go beyond the traditional A-weighted sound pressure level, which is usually used to rank different noise sources, because we believe that a complete sound quality analysis gives wider and more reliable results”.

He adds, “The objective is to analyse the actual sound quality performance of the various types of Orona lifts, to correlate the sound quality with the different noise sources and to study the most suitable approaches to improve the comfort of the lifts”.

Before carrying out the sound quality process, the types of lifts to be analysed were selected and six of each type were tested. Three up and three down full travelling cycles (doors closing, acceleration, constant speed, deceleration, and doors opening) were measured from the bottom to the top floor and back and the time data was the basis for the following sound quality analysis.

The equipment used consisted of Brüel & Kjær’s Sound Quality Head and Torso Simulator (HATS) Type 4100-D equipped with two microphones for binaural noise measurements. The two signals were recorded using a PULSE IDAe front-end and Time Data Recorder software.

Unai Galfarsoro, from Mondragon University, says, “When we decided to purchase a system to acquire and analyse noise and vibration signals, we were looking for a modular and scalable system from a manufacturer well-known for consistency, high-quality and ability to offer the broadest range of state-of-the-art applications. The immediate and excellent support of the local Brüel& Kjær office was another vital factor”.

He adds: “The PULSE front-end is very useful for measurements inside a moving lift, as it makes no noise at all (its fan can be switched off during measurements) and it can be battery operated. Besides, Time Data Recorder software is extremely simple to configure and use for time data measurements”.

About Bruel & Kjaer
Brüel & Kjær is a world-leading manufacturer and supplier of sound and vibration solutions for use in a wide range of applications including environmental noise measurements, building acoustics, vibration measurements and quality control for use in the automotive, aerospace and consumer industries, as well as by local authorities. Today Brüel & Kjær has 900 employees and sales offices in 55 countries. Brüel & Kjær is a subsidiary of UK-based Spectris plc. ( Spectris has annual sales of approximately £656m and employs around 6000 people worldwide in its 15 business units.

February 2010

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