Topography optimization of an enclosure panel for low-frequency noise and vibration reduction using the equivalent radiated power approach

Noise mitigation by means of the acoustic black hole (ABH) effect is a well-known engineering solution. However, the conventional method of applying ABH effect which requires modification of the structure geometry has various limitations which encourage the research of virtual ABH concept. In this study, the effect of ABH was applied through introducing virtual stiffness by a shunt circuit. According to the force-voltage electric analogy, stiffness has an inverse relationship with capacitance. So that the ABH effect can be virtually realized by following a power law profile using an array of independent capacitive shunts. The concept is studied through finite element simulation developing a macro code in ANSYS Parametric Design Language (APDL). To evaluate the influence of capacitance profile on the acoustic radiated power, parametric studies are conducted. Based on the results of the parametric studies, the capacitance profile is tuned for minimum radiated power. It is revealed that the virtual acoustic black hole (ABH) effect can offer 10.29%, 6.37%, and 7.47% reduction in the radiated power from the first to the last targeted mode, respectively. The virtual ABH effect introduced in this study can be used for semi-active structural noise isolation without any weight or manufacturing penalty.

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“…8. As employed in this study, the equivalent radiated power (ERP) and its level (ERPL) can be obtained as (Kim et al, 2019)…”

Section: Methodsmentioning

confidence: 99%

Numerical realization of a semi-active virtual acoustic black hole effect

Soleimanian

Petrone²,

Franco³

et al. 2023

Front. Mech. Eng.

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“…When the output of the controller reaches the optimal output, the maximum sound power reduction performance of the multifrequency VMI control system is determined by (2) in Section II. The radiated sound power in (2) is determined by the acoustic transfer functions and for the sound pressure and particle velocity, respectively, in (1). and represent the characteristics of a structural-acoustic system.…”

Section: B Relation Between Optimal Performance and Radiation Efficiencymentioning

confidence: 99%

“…This method reduces the radiated sound power of the enclosure panel by increasing its mass, damping, and stiffness. This goal is possible by increasing the thickness, attaching damping material, and changing the shape of the panel [1], [2]. However, these passive methods have the potential to affect other important performance requirements of the machinery, such as weight reduction, cooling, and appearance.…”

Section: Introductionmentioning

confidence: 99%

Optimal Filter Design of a Virtual Mechanical Impedance Control System for Multifrequency Active Sound Power Reduction of Enclosure Panels

2021

Self Cite

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This paper describes an optimal filter design method for a virtual mechanical impedance (VMI) control system. Existing passive methods for reducing machinery noise are limited in use due to weight reduction, cooling, and appearance problems. The VMI control method, which does not require a sensor and can be implemented with a small number of actuators, is an active method that can replace the existing passive methods when mechanical tuning is difficult. However, the existing VMI control method can only reduce the single-tone noise. In this regard, we improved the VMI control system to reduce the radiated sound power of the enclosure panel at multiple frequencies. To achieve this, we propose an optimal filter design method for a multichannel feedback controller. Unlike the existing VMI control, the method capable of multifrequency control considers the radiation efficiency, damping, and estimation errors of the structural-acoustic system. The controller designed using the proposed method satisfies the required robustness and minimum steadystate error in the target frequency band. The results obtained from the finite element-based model and the experimental model show that the radiated sound power of the enclosure panel is reduced at multiple target frequencies after control.

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“…Topography optimization is mostly applied on sheet metal parts. It is used to solve NVH problems and maximize the natural frequency of some vehicle parts (Kim et al, 2019). It is also a useful optimization method in order to make better designs on stamped sheet metal or molded plastic parts with minimum user input and automatic shape variable generation (Brennan and Hayes, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…It is used to find the optimum rib distribution on the structure within certain constraints. The advantage of the topography optimization compared to other methods, it needs minimal manufacturing effort and cost without additional increase in weight (Kim et al, 2019). As a short definition, this method increases the stiffness of component by modifying the geometry, especially the weak areas (Darge et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Optimum Design of Thermo-Plunger Support in Commercial Vehicles by Using Structural Design and Finite Element Methods

Kılıçarpa

Yıldız

2022

UUJFE

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This paper focuses on creating an optimum design and development of thermo-plunger parts for commercial vehicles in order to save material, reduce mass and make more sustainable automobiles. In this paper, natural frequency analysis, topology, and topography optimization methods have been used to create a new design for the thermo-plunger part. Thermo-plunger means an electric heater that is used for heating the inside of automobiles effectively and quickly and providing customer thermal comfort. It is positioned in the vehicle body, and its support parts have been developed by structural optimization techniques because there is not enough space in the engine compartment for automatic transmission commercial vehicles. The aim of this study is to make a lightweight and reinforced thermo-plunger support part design. Initially, a draft design was created in 3D model software. After that, topology and topography optimizations were applied on this draft design. At the end of studies, a final optimum support design has been obtained. The final design is 41.1% lighter than the initial design. At the same time, above 50 Hz natural frequency value has been obtained on the final design to avoid resonance problems.

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Topography optimization of an enclosure panel for low-frequency noise and vibration reduction using the equivalent radiated power approach

Cited by 19 publications

References 15 publications

Numerical realization of a semi-active virtual acoustic black hole effect

Numerical realization of a semi-active virtual acoustic black hole effect

Optimal Filter Design of a Virtual Mechanical Impedance Control System for Multifrequency Active Sound Power Reduction of Enclosure Panels

Optimum Design of Thermo-Plunger Support in Commercial Vehicles by Using Structural Design and Finite Element Methods

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