$2,499, Enclosure Modeling - Purdue University · Bass Reflex Sealed Enclosure Internal Volumes and...
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Dynamically Responsive Audio System Capstone Senior Design Project • Fall 2019 DRA Systems DRA Systems thanks the following for their assistance in the development of the project: • Speaker cabinets have a fixed frequency range they can reproduce, and different designs are appropriate in different contexts Low-frequency (10-60Hz) reproduction comes at the cost of high-frequency amplitude • A new box must be designed for each new context Our Mission: To provide personalized audio systems with unprecedented levels of acoustic flexibility through expert mechanical design • Expected Audio Equipment Industry Revenue in 2019 of ~$23 billion • Steady market growth of 3.1% from 2014- 2019 • SVS PB 16 - “Tunable” Mechanical Coupling ($2,499, at right) • Custom Builds ($2,000-$5,000) • Legacy Audio Whisper XDS ($20,000-$30,000) • Speaker lid and bottom port mobility allow the change of enclosure order • Available states: Sealed, Ported, and Bandpass enclosure types • Clean UI with built-in safety switches: • Apply our design flow for fully-automated custom speaker system generation • Focus on only subwoofer enclosures to reduce complexity and emphasize our competitive advantage • Parametric modeling of the speaker enclosure allows for automatic modeling of a personalized enclosure in minutes Left Enclosure: 16” footprint, 45 Hz design frequency Right Enclosure: 14” footprint, 70 Hz design frequency Electronics and Controls • eCAD used to create electrical crossover, simulating the equalization a user might provide Jon Adair Alex Fleisch Adam Krebs JC McCaw Katherine Schauer Sam Wonfor Unit Cost Sales Price Annual Sales Annual Revenue $1,240 $5,000 150 $750,000 Frequency [Hz] • Desired frequency response drives enclosure dimensions • Model uses Thiele/Small parameters from driver in enclosure design equations Decibels 6th Order Bandpass 4th Order Bandpass Bass Reflex Sealed Enclosure Internal Volumes and Port Dimensions 4th Order Bandpass Bass Reflex 6th Order Bandpass Sealed Thiele/Small parameters from driver Frequency Response Graph Frequency Modeling Realized Circuitry • Enclosure type set by state machine controlled by user switch and safety switches SEALED Port Closed, Panel Open PORTED Port & Panel Open BANDPASS Port Open, Panel Closed INPUT: 110 & NOT (Safety Switches) 111 111 011 Home Use User’s High- Fidelity Audio Unique Mechanical Coupling Our Dynamically Responsive Enclosure Unique Applications Smaller Venue, Home Theater Open Auditorium, Outside Low-end Boost Low-end Extension “Flat” Enclosure Through mechanical design, a single enclosure can behave as several unique enclosures: Our parametric model allows for flexibility and scalability. Problem Definition Benchmarks Business Case Our Innovation Acoustic Modeling Test Results Enclosure Modeling Electronics and Controls Acknowledgements Final Prototype Moving Forward • Daniel Bollock with the Purdue Forestry Dept. • The Bechtel Innovation and Design Center (BIDC) • Dustin Cruise • Weimin Thor and Prof. Yangfan Liu at Herrick Laboratories • Mike Sherwood, Steve Florence, and the ME Staff • Prof. Jensen and the ME463 Faculty • Bass Reflex and Sealed match design frequency response • 4 th order peaked at 42 Hz, designed frequency of 50 Hz • 6 th order peaked at 43 Hz, designed frequency of 45 Hz
Transcript of $2,499, Enclosure Modeling - Purdue University · Bass Reflex Sealed Enclosure Internal Volumes and...
Dynamically Responsive Audio SystemCapstone Senior Design Project • Fall 2019
DRA Systems
DRA Systems thanks the following for their assistance in the development of the project:
• Speaker cabinets have a fixed frequency range they can reproduce, and different designs are appropriate in different contexts Low-frequency (10-60Hz) reproduction comes at
the cost of high-frequency amplitude• A new box must be designed for each new context
Our Mission: To provide personalized audio systems with unprecedented levels of acoustic flexibility through expert mechanical design
• Expected Audio EquipmentIndustry Revenue in 2019of ~$23 billion
• Steady marketgrowth of 3.1% from 2014-2019
• SVS PB 16 - “Tunable” MechanicalCoupling ($2,499, at right)
• Custom Builds($2,000-$5,000)
• Legacy Audio Whisper XDS($20,000-$30,000)
• Speaker lid and bottom port mobility allow the change of enclosure order
• Available states: Sealed, Ported, and Bandpass enclosure types
• Clean UI with built-in safety switches:
• Apply our design flow for fully-automated custom speaker system generation
• Focus on only subwoofer enclosures to reduce complexity and emphasize our competitive advantage
Enclosure Modeling• Parametric modeling of the speaker enclosure allows for
automatic modeling of a personalized enclosure in minutes
Left Enclosure: 16” footprint, 45 Hz design frequencyRight Enclosure: 14” footprint, 70 Hz design frequency
Electronics and Controls
• eCAD used to create electrical crossover, simulating the equalization a user might provide
Jon Adair Alex Fleisch Adam Krebs JC McCaw Katherine Schauer Sam Wonfor
Unit Cost Sales Price Annual Sales
Annual Revenue
$1,240 $5,000 150 $750,000
Frequency [Hz]
• Desired frequency response drives enclosure dimensions• Model uses Thiele/Small parameters from driver in enclosure
design equations
Dec
ibel
s
6th Order Bandpass4th Order BandpassBass ReflexSealed
Enclosure Internal Volumes and Port Dimensions
4th Order Bandpass Bass Reflex
6th Order Bandpass SealedThiele/Small parameters from driver
Frequency Response Graph
Frequency Modeling Realized Circuitry
• Enclosure type set by state machine controlled by user switch and safety switches
SEALED
Port Closed,
Panel Open
PORTED
Port & Panel
Open
BANDPASS
Port Open,
Panel
Closed
INPUT: 110 & NOT(Safety Switches)
111
111
011
Home Use
User’s High-
Fidelity
Audio
Unique Mechanical Coupling
Our Dynamically Responsive Enclosure
Unique Applications
Smaller Venue, Home Theater
Open Auditorium,
Outside
Low-end Boost
Low-end Extension
“Flat” Enclosure
Through mechanical design, asingle enclosure can behave asseveral unique enclosures:
Our parametric model allows for flexibility and scalability.
Problem Definition
Benchmarks
Business Case
Our Innovation
Acoustic Modeling Test Results
Enclosure Modeling
Electronics and ControlsAcknowledgements
Final Prototype
Moving Forward
• Daniel Bollock with the Purdue Forestry Dept.
• The Bechtel Innovation and Design Center (BIDC)
• Dustin Cruise
• Weimin Thor and Prof. Yangfan Liu at Herrick Laboratories
• Mike Sherwood, Steve Florence, and the ME Staff
• Prof. Jensen and the ME463 Faculty
• Bass Reflex and Sealed match design frequency response• 4th order peaked at 42 Hz, designed frequency of 50 Hz• 6th order peaked at 43 Hz, designed frequency of 45 Hz
