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Method of System Fan Detection using a Microphone to Detect Fan Acoustics

IP.com Disclosure Number: IPCOM000237795D
Publication Date: 2014-Jul-11
Document File: 1 page(s) / 20K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method applied within a server cooling system to use a system microphone to detect the fan acoustics during system boot-up and then determine the type (and thus vendor) of fans installed in the system.

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Method of System Fan Detection using a Microphone to Detect Fan Acoustics

Systems typically have fans from multiple vendors. Fan blade design normally differs between vendors in terms of the number of fan blades. This is especially true in the case of counter-rotating fans, which are dominant in the server space. A varying fan blade count results in differing acoustic signatures. Since the cooling system design needs to set the appropriate volumetric airflow of the fans to cool the components, it is imperative that the vendor fan is known at system boot-up so that the proper pulse-width modulation (PWM) table can be applied by the Integrated Management Module (IMM).

Currently, technicians determine between fan vendors by adding Vital Product Data (VPD) to the fans; however, this results in increased cost and system complexity.

The novel method uses a system microphone to detect the fan acoustics during system boot-up and then determine the type (and thus vendor) of fans installed in the system.

During system boot-up, using the system microphone, the number of fan blades in the system fans is determined through a comparison of the fan acoustics for the fans in the system. Each fan vendor has a predetermined acoustic signature. The acoustic signature is dominated by blade tip effects. The number of blades for both inlet and outlet is easily determined based on the fan operation at any speed. A simple lookup table is accessed for information to determine the proper...