Related Experiment Video
Updated: Jun 2, 2026
07:46
Data Acquisition Protocol for Determining Embedded Sensitivity Functions
Published on: April 20, 2016
Virtual sensors for active noise control in acoustic-structural coupled enclosures using structural sensing: part
Dunant Halim1, Li Cheng, Zhongqing Su
1Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong.
The Journal of the Acoustical Society of America
|April 12, 2011
Summary
Optimizing structural sensor placement enhances vibro-acoustic virtual sensor performance for active noise control. Proper placement improves estimation of interior sound pressure by maximizing modal observability for key modes.
Area of Science:
- Acoustics
- Structural Dynamics
- Control Engineering
Background:
- Active noise control (ANC) systems require accurate estimation of interior sound pressure.
- Vibro-acoustic virtual sensors offer a method to estimate sound fields using structural sensor data.
- Optimizing sensor placement is crucial for virtual sensor accuracy and ANC effectiveness.
Purpose of the Study:
- To propose an optimization approach for structural sensor placement.
- To enhance the performance of vibro-acoustic virtual sensors for ANC applications.
- To improve the estimation of interior sound pressure in coupled acoustic-structural enclosures.
Main Methods:
- Development of a vibro-acoustic virtual sensor using structural sensors.
- Proposal of a spectral-spatial performance metric to quantify sensor output energy.
- Analysis of virtual sensing error contributions (modal error and noise).
- Investigation of modal observability levels and their dependence on modal coupling and resonance frequencies.
Main Results:
- Virtual sensing error energy is additively composed of modal error and measurement noise.
- Modal virtual sensing error depends on structural sensing and acoustic virtual sensing observability.
- Modal observability is influenced by modal coupling and resonance frequencies of structural/cavity modes.
- Optimal sensor placement was proposed to achieve high modal observability for critical modes.
Conclusions:
- Structural sensor placement significantly impacts virtual sensing and ANC performance.
- Optimized sensor placement is particularly important for cavity-controlled modes.
- The proposed approach provides a method for designing effective sensor configurations for ANC.
Related Concept Videos
01:28Internal Loadings in Structural Members: Problem Solving
When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal loadings...
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal loadings...
01:23Insulation Coordination
Insulation coordination is the process of matching electric equipment's insulation strength with protective device characteristics to protect the equipment against expected overvoltages. This selection is based on engineering judgment and cost. Equipment can generally withstand short-duration high transient overvoltages, but repeated tests with identical waveforms can yield inconsistent results. As a result, standard impulse voltage waveforms are used for testing, defined by specific times for...
01:21Perceiving Loudness, Pitch, and Location
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...