scholarly journals APLIKASI HELMHOLTZ RESONATOR DENGAN VARIASI JUMLAH MONONECK DALAM ARAH LONGITUDINAL PADA INLET MANIFOLD MOTOR DIESEL SUPERCHARGING 4 TAK

2021 ◽  
Vol 1 ◽  
pp. 26-30
Author(s):  
Mesak F. Noya ◽  
Abdul Hadi
Keyword(s):  
Helmholtz Resonator ◽  
National Instrument ◽  
Inlet Manifold

Penelitian ini bertujuan untuk mengetahui pengaruh Circular Helmholtz Resonator dengan variasi jumlah Mononec pipa kapiler terhadap Supercharging yang digerakan elektromotor. Penelitian eksperimenal ini dilakukan dengan 6 variasi Mononeck yang dipasang secara longitudinal up side down. Piezotronics, National Instrument dan Matlab digunakan untuk mengakuisisi data menjadi lebih akurat. Hasil pengukuran selisih rata-rata tekanan output dan input menyatakan bahwa Circular Helmholtz Resonator berpengaruh terhadap tekanan udara keluaran yang merupakan tekana udara input motor diesel.

Broadband acoustic focusing via binary rectangular cavity/Helmholtz resonator metasurface

2021 ◽  
Vol 129 (15) ◽  
pp. 155307
Author(s):  
Shuai Tang ◽  
Bin Ren ◽  
Yuxin Feng ◽  
Jie Song ◽  
Yongyuan Jiang
Keyword(s):  
Helmholtz Resonator ◽  
Rectangular Cavity ◽  
Acoustic Focusing

scholarly journals Computing the Sound of the Sea in a Seashell

2021 ◽  
Author(s):  
Jonathan Ben-Artzi ◽  
Marco Marletta ◽  
Frank Rösler
Keyword(s):  
Characteristic Function ◽  
Helmholtz Resonator ◽  
Positive Answer ◽  
Approximation Procedure ◽  
Universal Algorithm

AbstractThe question of whether there exists an approximation procedure to compute the resonances of any Helmholtz resonator, regardless of its particular shape, is addressed. A positive answer is given, and it is shown that all that one has to assume is that the resonator chamber is bounded and that its boundary is $${{\mathcal {C}}}^2$$ C 2 . The proof is constructive, providing a universal algorithm which only needs to access the values of the characteristic function of the chamber at any requested point.

The Frequency of a Helmholtz Resonator With a Hyperboloidal Mouth

1925 ◽  
Vol 25 (5) ◽  
pp. 705-710 ◽  
Author(s):  
Arthur Taber Jones
Keyword(s):  
Helmholtz Resonator

On helmholtz resonator effects in the discharge system of a two-cylinder compressor

1973 ◽  
Vol 30 (3) ◽  
pp. 263-277 ◽  
Author(s):  
W. Soedel ◽  
E. Padilla Navas ◽  
B.D. Kotalik
Keyword(s):  
Helmholtz Resonator ◽  
Discharge System

Active Helmholtz Resonator With Positive Real Impedance

2006 ◽  
Vol 129 (1) ◽  
pp. 94-100 ◽  
Author(s):  
Jing Yuan
Keyword(s):  
Noise Control ◽  
Helmholtz Resonator ◽  
Control Device ◽  
Positive Real ◽  
Noise Field ◽  
Strictly Positive Real ◽  
Control Devices ◽  
Passive Noise ◽  
Active Resonator ◽  
Electronic Resonance

The impedance of a passive noise control device is strictly positive real, if the device is installed in noise fields with weak mean flows. Passive noise control devices are, therefore, more reliable than active ones. Active control may be applied to a Helmholtz resonator to introduce electronic resonance. It will affect the impedance Zact of the resonator. A controller may be designed such that (a) Zact is small and resistive at some tunable frequencies; and (b) Re{Zact}⩾0 in the entire frequency range of interest. If criterion (a) is satisfied, the active resonator can suppress duct noise at tunable frequencies. It is difficult to design a controller to satisfy criterion (b) because parameters of the controller depend on acoustic parameters of the noise field. A new method is proposed here to design an active controller to meet both criteria simultaneously. The satisfaction of criterion (b) implies a positive real Zact and a robust active resonator with respect to parameter variation in the noise field. Experimental results are presented to verify the performance of the active resonator.

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