Active Sound Profiling via Self-Tuning Acoustic Wave Amplitude Control
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Solution Overview
Problem
Existing active sound profiling systems face challenges in accurately tuning the amplitudes of injected acoustic waves to achieve the desired resulting sound, leading to inconsistencies in mimicking the sound of a target vehicle.
Innovation Solution
An automated method using a simulation environment and mathematical models to tune the amplitudes of injected acoustic waves, employing look-up tables and self-tuning procedures to adjust equalization coefficients based on engine workpoints, ensuring precise amplitude adjustment for accurate sound profiling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual tuning methods are used to adjust acoustic wave amplitudes, then the system is simpler to implement, but the amplitude precision and sound profiling accuracy deteriorate
Solution Approach 1:
The system performs self-tuning through automated procedures that measure the actual acoustic wave amplitudes and automatically adjust the diffuser actuator signals to achieve target amplitude values, eliminating the need for manual calibration while achieving high precision
Solution Approach 2:
The system implements feedback control by measuring the actual amplitudes of acoustic waves injected into the exhaust stream and using these measurements to adjust the diffuser actuator signals, ensuring precise amplitude matching with the target vehicle sound profile
2Manufacturing precision
If automated tuning procedures are implemented, then the amplitude tuning precision improves, but the complexity of the system increases
Solution Approach 1:
The system automatically measures its own acoustic wave amplitudes and adjusts its own actuator signals through self-tuning procedures, achieving high sound profiling accuracy without requiring external manual intervention or complex external calibration equipment
Solution Approach 2:
The system performs preliminary measurements of the actual acoustic wave amplitudes before finalizing the actuator signals, allowing the tuning process to be completed in advance during system setup or maintenance periods, thereby achieving high precision without adding operational complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables precise tuning of acoustic wave amplitudes, allowing for accurate reproduction of target vehicle sounds, enhancing the accuracy and effectiveness of active sound profiling systems.
Implementation Method 1
injecting, via an acoustic-wave diffuser, into a secondary propagation path that merges in said primary path, second acoustic waves that are able to combine with said first acoustic waves in a merge point in said primary propagation path and to generate third resulting acoustic waves
Data Source
AI summary
A method for performing an active profiling of the sound emitted by a vehicle engine including the steps of injecting second acoustic waves (MW), which are able to combine with the first acoustic waves (EW) in a merge point in said primary propagation path and to generate third resulting acoustic waves (RW); and generating a driving signal for the diffuser by regulating the amplitude of harmonics of the driving signal (SP) as a function of reference acoustic waves and of a workpoint of the engine, calculating equalization coefficients (α1, . . . , αM) to be applied to the amplitudes of said harmonics of the driving signal (SP) via a self-tuning procedure, and comparing the reference acoustic waves (TW) with a simulation (SRW) of the resulting waves. The simulation (SRW) is obtained by applying to a simulation of the second acoustic waves a model of the secondary propagation path.