VTT Technical Research Centre of Finland Marko Antila Design of a Real-time Audible Noise Modeling Platform using Simulink

Transcription

1 VTT Technical Research Centre of Finland Marko Antila Design of a Real-time Audible Noise Modeling Platform using Simulink Challenge Real-time modeling of sounds and noise is increasingly needed in product development. Solution AMP- Audible Model Platform, built on SIMULINK. Advanced parameterized noise player, may utilize measured or modeled parameters Results Working AMP concept Usage of AMP in several application areas Utilization of AMP in evaluation of sound quality 1

2 Motivation and challenge Real-time modeling become more and more important Including sounds and noise! Not only for training and visualization-auralization but True virtual model-based product development Systems needed for quick what-if analysis Should operate stand-alone and also with a Virtual Reality (VR), in Virtual Environment (VE) Need for a tool to create sounds to be evaluated for quality (Psychoacoustics) Several commercial sw applications to model noise exist Still wanted something modular, easy-to-use and re-usable 2

3 Requirements 1. Lightweight processing needs Should run on a laptop 2. Should produce audible noise in full audio bandwidth No glitches, dropouts or distortion allowed 3. Parameter-based Everything driven by parameters 4. Strictly real-time Immediate response to parameter changes 5. Modular High re-usability Suitability for different applications 3

4 A solution: AMP - Audible Model Platform Built on SIMULINK Advanced parameterized noise player not a replacement for audible modeling software tools based on physics Measured or modeled parameters Requirement Lightweight processing need Audible noise in full audio bandwidth Parameter-based Strictly real-time Modular Visual and self-documenting Solution Multi-rate data processing, optimised blocks Frame-based data processing and optimized audio buffering All audio is synthesized from a scratch, based on parameters Discrete time solver Hierarchical design, usage of functional subsystems Extensive usage of GUI-style blocks 4

5 Why real-time audible modeling is needed? Why not recorded sounds? Why not off-line? Issue Real-time audible modeling Recorded or off-line generated sounds Possibility to react to whatif questions Evaluation of non-existent product Input data complexity and file size Real-time connectivity to visualization and virtual reality tools Suitability for different product sounds Accuracy of the audible sound Available, quick evaluation of different scenarios Possible Low-complexity and lightweight, only parameters are needed Excellent, only parameters are sent to control AMP via UDP After initial effort to develop the platform easy to apply to different products due to the modular, Simulink-based design Accuracy varies but may be tailored to be close enough the product sound Limited, all possible variations must be available beforehand No recordings available, off-line modeling software may create audio files Well-known audio formats, but may be large especially in uncompressed formats May be used as sample players, but limited level of controllability All products must be treated separately and Very accurate if recorded form the product; if off-line generated depends on the off-line modeling quality 5

6 A sidestep: AMP background Spin-off on our work on Active Noise Profiling (ANP) system 4 mics, loudspeakers, 6 engine orders profiled tested in lab and road conditions Jari Kataja (2012) Development of a robust and computationally efficient active sound profiling algorithm in a passenger car. Degree of Lic. Tech., Tampere University of Technology: Tampere, Finland. Fully featured Simulink model used in the system development was evolved into AMP Tacho Tone synthesis Parallel adaptive filters S Output to loudspeakers CONTROL ELECTRONICS AMPLIFIERS AMPLIFIER Noise target profile Advanced plant model Control law Error signals from microphones ENGINE SYSTEMS: - RPM - Load - Others 6

7 AMP application areas AMP may be used and has been used to reproduce sounds/ noise in a mine loader cabin (moving machinery) in a car cabin (vehicles) around large diesel engines (factories and installations) wind power noise (environmental noise) noise in workshops (noise at a workplace) 7

8 Case example Sandvik LH410 (Toro 7) Underground Loading and Hauling Device, LHD Usually known as a loader Used in mines to load and transport rocks 8

9 LHD (Loading and Hauling Device) sound sources MANUAL CONTROL Ventilation/ Air Conditioning (Blade Passing Frequency - BPF, broadband) Engine (low orders) VARIABLE RATIO Transmission after moment converter (low orders) RATIO INDEPENDENT AUTOMATIC CONTROL Cooling (BPF, broadband) Hydraulics (high orders) Work Cycle sounds 9

10 Step 1: Binaural recordings The time domain data captured In LHD cabin Also simultaneously rpm and load information, and rpm after moment converter Used for the analysis and base for the engine sound model Also data from modeled audio field might be used x

11 Step 2: Parameter extraction for periodic noise components x 10 5 LOAD RPM , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,163 36, , , , , ,163 36, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,57247 Matlab scripts extract automatically : Engine and auxiliary devices orders level and relative phase information By RPM and load multidimensional table Automatic data acquisition from incomplete partial data Also visualisation in frequency and order domains 11

12 Step 3: Ventilation noise parameter extraction with modeling Goal: to be able to produce audible ventilation noise based on the parameters Geometry, flow rate, pressure drop, Modelling: CFD, parameters to AMP and also to VE Result: Audible noise model based on CFD calculations Unique: full chain from CFD - > Simulation model - > real-time audible noise Ventilation noise contributions Diff max-min Diff max-off Diff min-off 40 Magnitude (db) Frequency (Hz) x

13 Parameter source selection Final step: Putting it all together and running the model Constant RPM 1200 Run-up/ Run-down Ventilation model Hydraulics/ cooling model Individual control of orders Engine model 13

14 Video: Example run 14

15 Bonus video: big diesel engine 15

16 Conclusions Audible Model Platform (AMP) is able to reproduce product noise efficiently in SIMULINK mimic different products (cars, trucks, moving machinery, diesel engines, wind turbines ) Some references: Antila M., Kataja J. and Kokkonen E. (2013) Virtual engine and ventilation noise generation for an underground loader cabin. Aachen Acoustic Colloquium 2013, Aachen, Germany: Antila M., Kataja J., Isomoisio H. and Nykänen H. (2014) Recording, evaluation and artificial real-time creation of metal workshop noise. Proceedings of Baltic-Nordic Acoustic Meeting 2014 (BNAM 2014). 2-4 June 2014 (to be published). Tallinn, Estonia. Aromaa S, Antila M, Kokkonen E, Krassi B, Leino S, Nykänen H, et al. (2013) Designing user experience for the machine cabin of the future. In: Belloni K and Ventä O (eds) eengineering Digitising the product process. Espoo, Finland: VTT, Antila M. and Kataja J. (2013) Tuulivoimamelun kuunneltava malli (Audible model of wind turbine noise, in Finnish). Akustiikkapäivät 2013: Turku, Finland Marko Antila VTT Technical Research Centre of Finland marko.antila@vtt.fi 16