PA Loudspeaker System Design Using Multiphysics Simulation
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1 PA Loudspeaker System Design Using Multiphysics Simulation An approach to reduce prototype and measurement times to a minimum By Riccardo Balistreri, QSC Audio Products LLC
2 Ceiling PA Speaker
3 Ceiling PA Speaker System
4 Ceiling PA Speaker Without grille Tweeter, Woofer, and Vent visible
5 Microphone array courtesy of Ron Sauro NWAA Labs
6 Frequency responses at different angles compared to on axis (usually the 0 degrees)
7 Frequency response versus angle, Sound Pressure Level displayed as gradient of colors (red=higher value, blue=lower).
8 3d version of frequency response versus angle
9 Normalized Polar Response. For a single frequency the on axis value is taken as reference, the SPL values at other angles are then measured and placed as ratio on the graph for the same frequency
10 Directivity index. Represents the ratio between the device under test sound intensity at different angles to an omnidirectional source of same average intensity expressed in decibels.
11 Approach with COMSOL Useful existing models: Baffled Membrane Loudspeaker Driver Lumped loudspeaker Driver Loudspeaker Driver in a Vented Enclosure
12 Design Guidelines for Product Development Baffle Diameters Enclosure Height Performance (SPL and frequency response) Loudspeaker Driver Estimated Volume Lumped Parameters 2d/3d Model
13 Lumped Parameters Woofer Thiele/Small Parameters Tweeter Parameters are attained in a slight different way as they have their own enclosure
14 Lumped Parameters for the woofer side Vo Low pass filter, in this case 2 nd order, but several configurations can be tried + - Low Pass Filter L1 C1 Generator that represent the amplifier (a resistor representing the output impedance could also be included ) i c Re Bl. u D is the back EMF induced voltage where u D is the velocity of the voice coil in the gap R'( ) Le ω Bl Electrical to Mechanical Domain u D Electrical aspects of the loudspeaker driver, Re would be the DC resistance of the Voice Coil, while Le, R are frequency dependent parameters, a more complex model that includes other function dependent parameters can be used + - Bl + - value=1 i c Mechanical aspects of the loudspeaker driver, Mms would be the moving mass, (voice coil, cone, dust cap, portion of the spider etc.), Cms the compliance of the moving system (spider with surround), Rms are the mechanical losses Mms Bl. i c is the Lorentz force that gets applied to the moving parts Cms Rms u D Mechanical to Acoustic Domain F D Sd + - value= 1 F D is the force coming back from axial pressure on the diaphragm coming back from the FEA model the axial acceleration of the diaphragm necessary in the FEA model is coming from the velocity per pulsation (inverse of time) Pressure in Acoustic Domain SPEAKER
15 Acoustic model
16 Acoustic model
17 Results
18 Results Inside the Box
19 Vented box Results
20 Vented box Results
21 Acoustic model
22 Results Tweeter frequency response W
23 A look at the problem W Results
24 A look at the problem W Results
25 Results A solution to the problem W
26 Results Tweeter frequency response W
27 Results Tweeter frequency response
28 A look at the problem W Results
29 A look at the problem W Results
30 Map Results
31 Map Results
32 Results Other example this time with a closed box and a low pass filter
33 Results Closed box with low pass filter
34 Results Frequency response with filter
35 Results Two way closed box system
36 Results
37 Results tweeter polarity inverted
38 Results Using parameters for another woofer different tweeter and waveguide geometry and crossover for both
39 Results Two way system frequency response W
40 Results Same seen at different angles
41 Polar responses Results
42 How close simulations are to reality? Results
43 Results
44 10k Results Meiloon Luix TW 4V 1m 2pi2 MLS 00deg.m ls (db) Level, Clio MLS SPL 110 on axis m easurem ent curve at 60 degrees 10k 2k 3k 4k 5k 6k 7k 8k 9k 20k Frequency ( Hz)
45 Thank you Results
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