Room Acoustics Simulator
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Building Performance Simulation for Design and Operation
When used appropriately, building performance simulation has the potential to reduce the environmental impact of the built environment, to improve indoor quality and productivity, as well as to facilitate future innovation and technological progress in construction. Since publication of the first edition of Building Performance Simulation for Design and Operation, the discussion has shifted from a focus on software features to a new agenda, which centres on the effectiveness of building performance simulation in building life cycle processes. This new edition provides a unique and comprehensive overview of building performance simulation for the complete building life cycle from conception to demolition, and from a single building to district level. It contains new chapters on building information modelling, occupant behaviour modelling, urban physics modelling, urban building energy modelling and renewable energy systems modelling. This new edition keeps the same chapter structure throughout including learning objectives, chapter summaries and assignments. Moreover, the book: • Provides unique insights into the techniques of building performance modelling and simulation and their application to performance-based design and operation of buildings and the systems which service them. • Provides readers with the essential concepts of computational support of performance-based design and operation. • Provides examples of how to use building simulation techniques for practical design, management and operation, their limitations and future direction. It is primarily intended for building and systems designers and operators, and postgraduate architectural, environmental or mechanical engineering students.
Room Acoustics
Since publication of the first edition in 1973, this professional and scientific reference has become the standard work in the field, providing detailed analysis of the state of the art in room acoustics. It outlines the theory and practice of sound behaviour in enclosed spaces. Particular emphasis is given to the properties and calculation of reverberation, the most obvious acoustical feature of a closed room. Further key topics include the mechanisms of sound absorption and psychoacoustical factors, from which design parameters and figures of merit are derived. Two chapters are devoted to practical questions such as measurement techniques and the procedures of room acoustical design. The interaction between a room's acoustic properties and its electroacoustic systems is also considered, and refined systems for optimizing listening conditions in a room are presented. This edition includes a new list of symbols, and updated sections include the measurement of the impulse response including a discussion of distortions, sound propagation as a diffusive process and scattering by wall irregularities.
Validation of Room Acoustic Simulation Models
For more than 50 years, simulation models for the prediction of acoustics in rooms have been implemented in software. Today, room acoustic simulations are established tools for architects, consultants and researchers. However, as most of the underlying models of these simulations are based on the simplifying concept of geometrical acoustics, the uncertainty and the validity of these simulations should always be considered when simulated results are evaluated. This thesis presents a comprehensive database intended for the validation of room acoustic simulation software. It includes eleven acoustic scenes, covering both simple environments and complex rooms. In addition to a detailed description and the definition of input data, acoustic measurements were carried out for all scenes. Furthermore, two studies are presented in which simulated and measured data for selected scenes of the developed database are compared. The first study, a round robin experiment with up to six participants, reveals various shortcomings of simulation models based on geometrical acoustics. The second study demonstrates how deviations of simulated results decrease when measured data is known beforehand and input data of the simulation is adjusted manually or systematically. The database along with the findings of the two presented studies provide a basis for the future revision of room acoustic simulation software.