A Feasibility Study of an ESG to Suppress Road Noise of a Car

Lee, Young-Sup; Ryu, Seokhoon; Yoo, Eunsuk; Lim, Cha-Sub

doi:10.3390/app12052697

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…Spatial considerations in large areas is one problem because more of the microphone, speaker and adaptive filters would be needed which exponentially increase the system complexity, and the reflection of sound that causes phase shifts must be taking into consideration. [18] When you search the earphone or headphone market, you will find out that the price of the earphones equipped with ANC is much lower nowadays. In the past, because of its complex circuit, system design and patent barriers, the price of the ANC product stayed high.…”

Section: Discussionmentioning

confidence: 99%

Review of ANC Algorithm

Diao¹,

Jin

2022

J. Phys.: Conf. Ser.

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In the contemporary society, the ANC (active noise cancellation) technology has become more and more popular. It has grown from its originally military and industry fields into commercial fields, and it is still being implemented into more and more areas and fields. In this paper, we briefly introduce some principal of ANC algorithms and contrast their results with the traditional ones and focus on challenges for future applications.

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Section: Discussionmentioning

confidence: 99%

Review of ANC Algorithm

Diao¹,

Jin

2022

J. Phys.: Conf. Ser.

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“…Figure 7 shows the comparisons of the SPLs of the C2, C4, and C8 before control (dotted lines) and after the pure ASP control (thin solid lines). Figure 7a,b displays the SPLs L E ( f ) of the C2 before and after controls and the noise reduction L NR ( f ) defined in Equation (10), respectively. In addition, the leakage term used in the real-time control experiment for the C2 order was attached to the upper side of each figure.…”

Section: Averaged Noise Reduction (Dba): L Nravgmentioning

confidence: 99%

“…Hence, in this study, an electronic sound generator (ESG) [9,10] and its dedicated control unit including a power amplifier were adopted for the ASP realization with a low cost. The ESG, which is composed of a voice-coil motor, was combined with a cowl panel of a car to generate a structure-borne sound as a secondary actuator, as can be seen from Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Engine Order Sound Using Additive Feedforward Control for a Secondary Path with Uncertainty at Higher Frequencies

et al. 2022

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An active sound profiling (ASP) control algorithm based on the command FxLMS with an additive feedforward enhancement is suggested to overcome the limited performance to track a pre-defined target sound in a car cabin when an electronic sound generator (ESG) attached to a cowl panel of a car was adopted as a secondary actuator. As the uncertainty of the secondary path including the ESG-cowl pair was increased especially at higher frequencies, the tracking performance of a pure ASP algorithm was limited. The feedforward enhancement was added to the pure ASP algorithm to allow a robust tracking performance against a pre-defined target sound to enrich the insufficient engine sound at higher engine orders. After implementing this additive ASP approach in a test car, a real-time control experiment was carried out to demonstrate its tracking performance. A target sound was defined to cancel three engine order noises and to enhance the other three order sounds in the experiment. The experiment results showed that the proposed approach was able to provide an improved robust tracking performance at the engine orders for enhancing sound at higher frequencies compared to the pure ASP algorithm.

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A Feasibility Study of the Use of PZT Actuators for Active Control to Enrich Engine Sound

et al. 2022

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This study examines the feasibility of a novel active sound enrichment (ASE) system using piezoelectric actuators as sound generators and an inverse control filter to supplement poor engine sound at the driver’s ear location in a passenger car instead of using an interior audio system. The proposed ASE algorithm is developed as a purely feedforward control strategy to track the pre-defined target engine sound (three engine orders). Theoretical and experimental analyses are investigated in-depth on the vibro-acoustic characteristics of a PZT (lead zirconate titanate) actuator bonded on a steel plate and a dedicated control filter to supplement sound using an inverse method to compensate for the secondary path. The location of the PZT-plate actuator was carefully chosen to satisfy the causality condition and robustly stable control of the ASE algorithm. The experimental ASE system was set up in a test car, and the ASE algorithm was implemented in a real-time controller. The real-time ASE experiment results showed that the measured sound of the three orders was well supplemented as the tracking of the target sound was achieved robustly with small errors without any divergent instability. Thus, this study suggests that the proposed ASE system using the PZT-plate actuator and the dedicated control filter is a feasible method for enriching sound in cars, and this approach can be considered as a masking tool against some exotic noise frequently observed in various vehicles including electric vehicles.

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A Feasibility Study of an ESG to Suppress Road Noise of a Car

Cited by 4 publications

References 18 publications

Review of ANC Algorithm

Review of ANC Algorithm

Enhancing Engine Order Sound Using Additive Feedforward Control for a Secondary Path with Uncertainty at Higher Frequencies

A Feasibility Study of the Use of PZT Actuators for Active Control to Enrich Engine Sound

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