Progettazione di un sistema di cancellazione attiva del rumore stradale da rotolamento
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1 Progettazione di un sistema di cancellazione attiva del rumore stradale da rotolamento Alessandro Costalunga Software Designer R&D Audio System Ask Industries S.p.A
2 ASK Industries S.p.A. Global Supplier of Acoustic and Communication Technology for OEM customers in the Automotive Industry. Main activities: Design, development and manufacturing of loudspeakers, amplifiers, antennas and cables for the automotive industry. 1965: Foundation 2015: enters in JVC KENWOOD Group A. Costalunga Page 2
3 Team ASK Industries Montecavolo R&D Audio System Department Active Noise Management Projects Active Road Noise Cancellation DUTIES HW/FW/SW Amplifiers development, Product Innovation, DSP, Audio Tuning OBJECTIVES Increase comfort in car interior Emphasize/Cancel engine order Car engine simulation TEAM Luca Cattani, Team Leader Alessandro Costalunga, Software Designer Carlo Tripodi, Software Designer Lorenzo Ebri, NVH Engineer Marco Vizzaccaro, Embedded Software A. Costalunga Page 3
4 Active Noise Cancellation Systems Resulting Noise Noise Source A. Costalunga Page 4
5 Active Noise Cancellation Systems Resulting Noise Noise Source Anti-Noise Source A. Costalunga Page 5
6 Problem: Road Noise Air-borne Road Noise Structure-borne Road Noise Air-borne Road Noise + Wind Noise Structure-borne Road Noise A. Costalunga Page 6
7 Active Control System Approach Road Noise Feedforward System Reference Signals Controller Control Signals Loudspeakers Error Signals Microphones Noise A. Costalunga Page 7
8 Challenges Road Noise Reference Signals Controller Control Signals Control Algorithm Loudspeakers Error Signals Reference Signals Selection Microphones On-the-field Validation Noise A. Costalunga Page 8
9 Control Algorithm Road Noise Reference Signals Controller Control Signals Loudspeakers Error Signals Microphones Noise Goal: C(s) = P(s) S(s) A. Costalunga Page 9
10 Control Algorithm Multichannel Modified Filtered-x Least Mean Square 1 Environment Simulator 2 Test several ANC algorithms from literature A. Costalunga Page 10
11 Algorithm Development Objectives 1 Environment Simulator 2 Test several ANC algorithms from literature Constrains Fast development Accuracy Solution Development of a simulator in Simulink Model Based Design Graphical Environment Rapid Debug Code generation A. Costalunga Page 11
12 Simulator A. Costalunga Page 12
13 Reference Signal Selection Detecting the structural source of noise in car interior Problem Typology Accelerometers Sensor Placement Adaptive Algorithm: Linear Filter Estimation of P S Coherence function A. Costalunga Page 13
14 Reference Signal Selection: Coherence C xd (f) Coherence is a function of frequency with values between 0 and 1 which measures the relative linearity between two signals Maximum theoretical noise reduction: 10 log 10 [1 C xd (f)] A. Costalunga Page 14
15 Reference Signal Selection: Process Position Selection NVH analysis of suitable positions Accelerometer placement Measurement Recordings on the target car Different road asphalts Different speeds Analysis Standalone software for analysis of recordings Selection of the most reliable positions A. Costalunga Page 15
16 Reference Signal Selection: Analysis Development of a standalone application in MATLAB Collect and explore large signal dataset Signal Processing Easy to use: Graphical User Interface Fast implementation Smart data types Wide set of build-in functions App Designer API Quick debug Complete documentation A. Costalunga Page 16
17 Reference Signal Selection: Analysis A. Costalunga Page 17
18 On-the-field Validation Performance Analysis Tight Deadlines Rapid Prototyping Approach Constant Algorithm improvements A. Costalunga Page 18
19 Rapid Prototyping Approach Algorithm Development Code Porting SW test & debug System test Algorithm Validation Expensive in term of time and resources Algorithm Development Algorithm Validation A. Costalunga Page 19
20 Prototype Car Alfa Romeo Giulia 2.0 L4 TurboGasoline 200Hp RWD AT A. Costalunga Page 20
21 Prototype Configuration Cancellation performend on Driver Seat Accelerometers; 2 Loudspeakers; 2 Microphones A. Costalunga Page 21
22 Experimental Results Rough asphalt, 50 km/h Cancellation on left ear Average: 3db Peak: 180Hz A. Costalunga Page 22 Cancellation on right ear Average: 2.5db Peak: 210Hz
23 Conclusion RNC system for automotive applications is feasible and effective MATLAB and Simulink are the best options for the development of innovative systems Rapid prototyping with MATLAB and Simulink is cost and time effective A. Costalunga Page 23
24 Progettazione di un sistema di cancellazione attiva del rumore stradale da rotolamento Alessandro Costalunga Software Designer R&D Audio System Ask Industries S.p.A
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