WO2016064360A1 - Procédé d'identification de fréquence dans le cas de problèmes nhv - Google Patents

Procédé d'identification de fréquence dans le cas de problèmes nhv Download PDF

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Publication number
WO2016064360A1
WO2016064360A1 PCT/TR2015/050125 TR2015050125W WO2016064360A1 WO 2016064360 A1 WO2016064360 A1 WO 2016064360A1 TR 2015050125 W TR2015050125 W TR 2015050125W WO 2016064360 A1 WO2016064360 A1 WO 2016064360A1
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WO
WIPO (PCT)
Prior art keywords
sound
frequency
amplitude
noise
spectrum
Prior art date
Application number
PCT/TR2015/050125
Other languages
English (en)
Inventor
Mehmet GÜRER
Ayhan YAGCI
Original Assignee
Tofas Turk Otomobil Fabrikasi Anonim Sirketi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tofas Turk Otomobil Fabrikasi Anonim Sirketi filed Critical Tofas Turk Otomobil Fabrikasi Anonim Sirketi
Priority to EP15798580.5A priority Critical patent/EP3209981A1/fr
Publication of WO2016064360A1 publication Critical patent/WO2016064360A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups

Definitions

  • the present invention relates to a method which enables to determine the frequencies of the sounds causing noise problems in NVH (Noise, Vibration, Harshness) area.
  • NVH Noise, Vibration, Harshness
  • Noise and vibration are among the factors affecting the driving comfort of the driver in the vehicle.
  • Noise problems seen in NHV world can comprise a crowded frequency spectrum originating from several problems.
  • For identification and solution of the problem it is required to identify the frequencies of sounds (for example local peak points) with higher amplitude than average in this spectrum.
  • Filtration technique is used for frequency analysis in the state of the art.
  • the recorded sound is subjected to digital filters and suspicious frequencies can be identified.
  • a sound having a dominant harmonic at 300Hz is filtered by applying bad-pass filter in range of 280-320 to the original sound record, it is listened in audio and this filtered range is removed from the total frequency spectrum. Therefore, other remaining sound ranges become almost inaudible, and therefore only problematic frequency is identified by listening.
  • this process requires expensive software modules comprising post process.
  • this process also requires noise free medium, high resolution earphones or loudspeaker; the requirement performing sound listening process in a suitable medium causes time loss as well the costs.
  • the objective of the present invention is to provide a method which enables to identify the noise sources in the vehicles in real-time. More specifically, the objective of the present invention is to provide a method for swiftly identifying which frequency is the sought frequency among several frequencies seems to be suspicious in a NVH noise problem.
  • the suggested technique is used while recording sound in a medium having noise problem, the sound is played externally in frequencies in which the suspicious peaks seen in frequency spectrum in real-time are generated. Therefore, it can be identified easily and swiftly which frequency is the frequency of the sought problem among the suspicious problems with amplitude increase to be generated in the related peak. If the frequency of the noise problem can be identified, it can be known where to look at in the spectrum as a result of improvement steps performed within the scope of noise eliminating/decreasing operations.
  • the fuel pump of the vehicle operates noisy in a disturbing level and if it can be determined that the noise occurs in a certain frequency (for example 118Hz), it can be looked at the change in peak only in the related frequency (which is 118HZ), not to the total noise level in order to see whether this solution works after sound insulation is performed on the pump.
  • the frequency content of a sound occurring in any operating condition of the vehicle for example when the engine is not operational, idle running or moving
  • being of interest to us can overlap with the frequency ranges of sounds emitted by different noise sources in the vehicle that are not of interest to us. In such cases, there are peak points very close to each other in certain frequency range and these all belong to different sound sources.
  • the suggested invention enables to be focused on the right point in the frequency area. Then it can be identified on which noise source should be focused on the vehicle by using the said frequency value.
  • Figure 1 is a frequency spectrum of a sound record received from an automobile the engine of which is in idle running.
  • Figure 2 is the frequency spectrum showing the amplitude increase in 118Hz frequency taken from an automobile the engine of which is in idle running and operating in same conditions and which is among the suspicious frequencies seen in screen of the measurement system.
  • a method for enabling to identify the noise frequencies in the vehicles essentially comprises the steps of collecting all sound together with the noise in the medium and recording to a digital medium,
  • the inventive method enables to identify the problematic frequency by increasing the amplitude of suspicious sounds in the frequency spectrum.
  • a device which can emit sound in broad frequency range (for example 50-12000 Hz) is used. This device emitting sound can be mobile or integrated to the measurement system (data collection device).
  • the said sound generator can be software installed in a digital medium (for example a computer). In case the said sound generator is a separate device or a device integrated to the data collection device, it emits sound to the medium in amplitude suitable for the medium and in a desired frequency.
  • the said device is software installed in a laptop computer, sound can be emitted to the environment through the loudspeaker of the laptop computer.
  • the noise is recorded to a digital medium (for example a computer).
  • a digital medium for example a computer
  • signals coming from sensors such as microphone, accelerometer placed on preferred points on the vehicle are collected by a data collection device and transferred to a digital medium (for example a computer).
  • a digital medium for example a computer
  • several required calculations are made on the collected sound data in real time, and a spectrum graphic is formed in the digital medium.
  • the said spectrum graphic is visually transferred to the user through a screen/monitor in the digital medium in real-time and it is viewed momentarily.
  • a sound generator is manually adjusted to generate sound in suspicious frequencies (S) that will be determined in this spectrum (for example 118, 197, 280 and 387 Hz).
  • the sound generator emits sound in suitable amplitude and suspicious frequency via a loudspeaker to the medium.
  • frequencies corresponding to the engine speed and frequencies known as its multiples for example there are frequencies corresponding to the engine speed and frequencies known as its multiples. Beside these, if there are peaks in frequencies which are not known from which components they are originated, these frequencies are considered to be suspicious. In one embodiment of the invention, these frequencies are considered to be 118, 197, 280 and 387 Hz.
  • Figure - 1 is a frequency spectrum of a sound record received from an automobile the engine of which is in idle running.
  • S suspicious frequencies
  • the 118, 197, 280, and 387 Hz frequencies are in spectrum shown in Figure 1 are suspicious frequencies (S) and other peaks are not related with the noise to be examined.
  • the sound generator is calibrated to a suspicious frequency (S) value (for example 118Hz frequency), and sound generation is enabled in suitable amplitude.
  • the amplitude in the selected suspicious frequency (S) (in the frequency of 188 Hz for this example) in frequency spectrum seen from the screen of the measurement system is increased ( Figure 2). Then, it is determined whether the sound in the frequency with increased amplitude (G) is the problematic noise.
  • This identification process is realized by listening with ear and interpreting the sound with brain. Therefore, it can immediately be understood whether the dominant frequency of the noise heard with ear is the said frequency (S) (118 Hz). If the said noise does not belong to the frequency with increased amplitude (G), the sound generator device is calibrated to the next suspicious frequency (S) value (for example to 197 Hz frequency) and the amplitude in this suspicious frequency (S) is increased. Then, it is queried again whether the sound in the frequency with increased amplitude (G) is the problematic noise. This process is performed repeatedly for each suspicious frequency (S) until the dominant frequency of the noise heard with ear is found.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

La présente invention concerne un procédé qui permet d'identifier les fréquences des bruits dans les véhicules, et qui comprend essentiellement les étapes consistant à collecter tous les sons en même temps que le bruit dans le milieu et effectuer un enregistrement sur un support numérique, former un graphique de spectre appartenant aux données du son collectées, visualiser ledit graphique de spectre, générer un son dans une amplitude appropriée dans une fréquence suspecte (S) devant être sélectionnée à partir du graphique de spectre, et augmenter uniquement l'amplitude du son dans ladite fréquence, et déterminer si le son dans la fréquence ayant une amplitude accrue (G) est le bruit posant problème.
PCT/TR2015/050125 2014-10-22 2015-10-06 Procédé d'identification de fréquence dans le cas de problèmes nhv WO2016064360A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15798580.5A EP3209981A1 (fr) 2014-10-22 2015-10-06 Procédé d'identification de fréquence dans le cas de problèmes nhv

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201412364 2014-10-22
TR2014/12364 2014-10-22

Publications (1)

Publication Number Publication Date
WO2016064360A1 true WO2016064360A1 (fr) 2016-04-28

Family

ID=54697629

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR2015/050125 WO2016064360A1 (fr) 2014-10-22 2015-10-06 Procédé d'identification de fréquence dans le cas de problèmes nhv

Country Status (2)

Country Link
EP (1) EP3209981A1 (fr)
WO (1) WO2016064360A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020143089A1 (fr) * 2019-01-10 2020-07-16 深圳市沃特沃德股份有限公司 Procédé et dispositif de détection de bruit intérieur d'automobile et équipement informatique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5748748A (en) * 1995-08-26 1998-05-05 Fichtel & Sachs Ag Apparatus and method for influencing oscillations in the passenger compartment of a motor vehicle and apparatus and method for detecting defects in a motor vehicle
JP2000214052A (ja) * 1999-01-28 2000-08-04 Nichiha Corp 異常音検出システム及び記録媒体
JP2001159586A (ja) * 1999-12-02 2001-06-12 Suzuki Motor Corp 音評価方法及び装置並びに音評価用プログラムを記憶した記憶媒体
US20080161063A1 (en) * 2006-12-29 2008-07-03 Motorola, Inc. Methods and devices for adaptive ringtone generation
US20090046868A1 (en) * 2004-09-23 2009-02-19 Thomson Licensing Method and apparatus for controlling a headphone

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5748748A (en) * 1995-08-26 1998-05-05 Fichtel & Sachs Ag Apparatus and method for influencing oscillations in the passenger compartment of a motor vehicle and apparatus and method for detecting defects in a motor vehicle
JP2000214052A (ja) * 1999-01-28 2000-08-04 Nichiha Corp 異常音検出システム及び記録媒体
JP2001159586A (ja) * 1999-12-02 2001-06-12 Suzuki Motor Corp 音評価方法及び装置並びに音評価用プログラムを記憶した記憶媒体
US20090046868A1 (en) * 2004-09-23 2009-02-19 Thomson Licensing Method and apparatus for controlling a headphone
US20080161063A1 (en) * 2006-12-29 2008-07-03 Motorola, Inc. Methods and devices for adaptive ringtone generation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020143089A1 (fr) * 2019-01-10 2020-07-16 深圳市沃特沃德股份有限公司 Procédé et dispositif de détection de bruit intérieur d'automobile et équipement informatique

Also Published As

Publication number Publication date
EP3209981A1 (fr) 2017-08-30

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