engineering sound csuf - meng concert hall mark e. rothermel principal rothermel & associates,...
TRANSCRIPT
Engineering SoundCSUF - Meng Concert Hall
Mark E. RothermelPrincipal
Rothermel & Associates, LLCArchitectural Acoustics Collaborative
• Building Acoustic Design to Support the Programmed Uses of the Hall• Orchestral Music• Romantic, Classical &
Contemporary Chamber Music• Civic Light Opera• Big Band• High School Bands• Opera• Choral Music
Engineering Sound = Architectural Acoustics
• HVAC Noise Control•Quiet Mechanical, Electrical & Plumbing Systems
• Sound Isolation•Walls, Roof, Doors & Windows
• Room Acoustics•Shaping, Materials, Finishes, Moveable Elements
Architectural Acoustics
HVAC Noise Control - Criteria
• Low Noise Levels Achieved Through:• Quiet Equipment Selections• Location of Equipment in Relation to Hall • Duct Routing, Dimensions and Lengths• Slow Airflow Velocities • Smooth Takeoffs and Transitions• Location of Remote Volume Dampers • Silencers and Duct Liner• Diffuser/Grille Selections and Sizes• Vibration Isolation of Mechanical, Electrical and
Plumbing Equipment and Piping
HVAC Noise Control
HVAC Noise Control
HVAC Noise Control
• Pressurized Main Duct• Low Velocity Air Drops
from supply air ‘mushrooms’
Sound Isolation
• Plan for Sound Isolation• Circulation, Lobby, etc. provide
buffer zones
•Walls• Grout-Filled Concrete Block Walls
•Doors• Sound Rated Acoustical Door Assemblies• Gaskets on Standard Doors at
Vestibules
•Windows• Thick, Multiple Glazing Layers in Airtight
Frames
•Roof• Concrete on Metal Deck
Sound Isolation
• Floors• Isolated, Floated Concrete Floor Slab
Over Structural Slab • Grad Slab with Perimeter Isolation Joints
• Special Construction• Box-in-Box Construction• Perimeter Isolation Joints • Floated Concrete Slabs• Vibration Isolated Gypsum Board
Ceilings
Sound Isolation
• Room Volume• Maximized for Reverberation – 400,000 Cubic
Feet
• Shaping• All Surfaces Have Specific Angular
Orientation, Shape, Radii – Nothing is Arbitrary
• Finishes & Materials• Heavy, rigid, stiff surfaces for bass support
• Variability• Movable Drapes & Banners• Movable Canopy
Room Acoustics - Basics
• Retractable Banners and Draperies Vary the Reverberation Time
Room Acoustics - Reverberation
Room Acoustics - Shaping
Room Acoustics - Shaping
Room Acoustics - Shaping
• Balcony Fascia Shaping• Shaped & Articulated, Tight Radius
Curves • Highly Sound Diffusive• Counters Focusing of Horseshoe-Shaped
Plan
Room Acoustics - Shaping
• Doubly-Curved, Moveable Canopy• Ensemble• Attack • Articulation• Clarity
• Grout-Filled Concrete Block Walls
• Concrete on Metal Deck Roof
• Rigid Interior Shapes and Surfaces of Heavy Plaster
• No Diaphragmatic movement
• All to Support Bass Response
Room Acoustics – Finishes & Materials
Acoustic Canopy • Directs Sound Toward Audience• Facilitates Ensemble by Allowing Musicians to Hear One
Another• Changes the Direct-to-Reverberant Ratio
Room Acoustics - Variability
Room Acoustics - Variability
• Moveable Fabric Banners Change the Reverberation Time (RT60)
•Quiet• Allows High Dynamic Range of
Music
• Isolated• No Distractions To or From
Neighbors
•Sound• Carefully Defined Interiors
Conclusion
Questions?