Generation and Measurement of Sound in Gases

Leonard, R. W.

doi:10.1007/978-3-642-45976-4_1

Cited by 3 publications

(4 citation statements)

References 23 publications

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“…In this research, due to the complexity of the functions used in the Helmholtz integral [46], such as Bessel and Hankel functions, an approximation method is used to evaluate the radiation impedance of a circular piston. This approximation is valid for spherical sources [47]. The equivalent radius of the circular piston, a[m], is obtained considering the same surface area for both the equivalent circle and the primary rectangle.…”

Section: Lumped Model Of the Flat Acoustic Sourcementioning

confidence: 99%

“…According to Ref. [47], a correction coefficient of 0.7 is used to convert the radius of a pulsating sphere (a ′ ) into the radius of an equivalent baffled pulsating piston. Therefore, at low frequencies (from 20 Hz to 1000 Hz), the radiation impedance of a baffled pulsating piston in half space is defined by the following two equations assuming a ′ = 0.7a:…”

Section: Lumped Model Of the Flat Acoustic Sourcementioning

confidence: 99%

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The influence of energy recovery on the overall efficiency of acoustic sources at low frequencies

Tajdari

Berkhoff

Zee

et al. 2020

Journal of Sound and Vibration

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Section: Lumped Model Of the Flat Acoustic Sourcementioning

confidence: 99%

Section: Lumped Model Of the Flat Acoustic Sourcementioning

confidence: 99%

The influence of energy recovery on the overall efficiency of acoustic sources at low frequencies

Tajdari

Berkhoff

Zee

et al. 2020

Journal of Sound and Vibration

View full text Add to dashboard Cite

“…In this research, due to the complexity of the functions used in the Helmholtz integral [45], such as Bessel and Hankel functions, an approximation method is used to evaluate the radiation impedance of a circular piston. This approximation is valid for spherical sources [46]. The equivalent radius of the circular piston, a [m], is obtained considering the same surface area for both the equivalent circle and the primary rectangle.…”

Section: Lumped Modelmentioning

confidence: 99%

“…This equivalent circular piston vibrates in an infinite rigid baffle and radiates into half space. According to [46], a correction coefficient of 0.7 is used to convert the radius of a pulsating sphere (a ) into the radius of an equivalent baffled pulsating piston. Therefore, at low frequencies (from 20 Hz to 1000 Hz), the radiation impedance of a baffled pulsating piston in half Figure 8: Equivalent electrical circuit of the lumped acoustic source.…”

Section: Lumped Modelmentioning

confidence: 99%

Energy-efficient low-frequence flat acoustic source

Tajdari¹

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A Probe Earmold System for Measuring Eardrum SPL Under Hearing-AID Conditions

Gilman

Dirks

1984

Scandinavian Audiology

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A miniature probe-microphone assembly for use with earmolds was developed to measure the sound pressure level (SPL) of a signal at the eardrum under hearing-aid conditions. The probe-earmold (PE) system was designed with the earmold as an integral part of the acoustic measurement system so that no part of the probe itself projects into the ear canal. Data obtained during a previous investigation with an ear simulator indicated that the PE system could be used to measure eardrum SPL accurately (+/- 3 dB) up to 6.0 kHz. In the current investigation, a behavioral experiment was conducted to validate the accuracy of the PE system on human ears. Comparisons were made between pure-tone thresholds obtained with a conventional earphone and those measured by the PE system using a hearing-aid receiver into an earmold-occluded ear. The basis for the study was the premise that the estimates of the eardrum SPL obtained from pure-tone thresholds are equivalent when the thresholds are determined by sound generated by an earphone into an unobstructed ear or by a hearing aid receiver into an earmold-occluded ear. Results of the study showed no statistically significant differences between the thresholds as determined by the two procedures confirming the simulator data. These results on human ears, together with the physical measurements in a simulator, suggest that the PE system can be used to measure eardrum SPL up to 6.0 kHz in an occluded ear.

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Generation and Measurement of Sound in Gases

Cited by 3 publications

References 23 publications

The influence of energy recovery on the overall efficiency of acoustic sources at low frequencies

The influence of energy recovery on the overall efficiency of acoustic sources at low frequencies

Energy-efficient low-frequence flat acoustic source

A Probe Earmold System for Measuring Eardrum SPL Under Hearing-AID Conditions

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