Analysis and synthesis of three-dimensional sound fields using a hybrid microphone array and a 3-layered loudspeaker array

2019 ◽  
Vol 443 ◽  
pp. 666-682
Author(s):  
Mingsian R. Bai ◽  
Yi-Hao Chiang ◽  
Po-Chen Wu
Keyword(s):  
Microphone Array ◽  
Three Dimensional ◽  
Sound Fields ◽  
Analysis And Synthesis

scholarly journals Regularised reconstruction of sound fields with a spherical microphone array

2013 ◽  
Author(s):  
Alba Granados ◽  
Finn Jacobsen ◽  
Efren Fernandez-Grande
Keyword(s):  
Microphone Array ◽  
Sound Fields

scholarly journals PRELIMINARY EVALUATION OF ATMOSPHERIC TEMPERATURE AND WIND PROFILES OBTAINED USING UNMANNED AERIAL VEHICLE BASED ACOUSTIC TOMOGRAPHY

2019 ◽  
Vol XLII-2/W13 ◽  
pp. 283-287 ◽  
Author(s):  
A. Finn ◽  
K. Rogers ◽  
J. Meade ◽  
J. Skinner ◽  
A. Zargarian
Keyword(s):  
Wind Velocity ◽  
Unmanned Aerial Vehicle ◽  
Sound Speed ◽  
Three Dimensional ◽  
Atmospheric Temperature ◽  
Preliminary Evaluation ◽  
Sound Fields ◽  
Aerial Vehicle ◽  
Wind Profiles ◽  
Virtual Temperature

<p><strong>Abstract.</strong> An acoustic signature generated by an unmanned aerial vehicle is used in conjunction with tomography to remotely sense temperature and wind profiles within a volume of atmosphere up to an altitude of 120&amp;thinsp;m and over an area of 300&amp;thinsp;m&amp;thinsp;&amp;times;&amp;thinsp;300&amp;thinsp;m. Sound fields recorded onboard the aircraft and by an array of microphones on the ground are compared and converted to sound speed estimates for the ray paths intersecting the intervening medium. Tomographic inversion is then used to transform these sound speed values into three-dimensional profiles of virtual temperature and wind velocity, which enables the atmosphere to be visualised and monitored over time. The wind and temperature estimates obtained using this method are compared to independent measurements taken by a co-located mid-range ZephIR LIDAR and sensors onboard the aircraft. These comparisons show correspondences to better than 0.5&amp;thinsp;&amp;deg;C and 0.3&amp;thinsp;m/s for temperature and wind velocity, respectively.</p>

scholarly journals Application of Linear and Nonlinear Graphs in Structural Synthesis of Kinematic Chains

1973 ◽  
Vol 95 (2) ◽  
pp. 525-532 ◽  
Author(s):  
M. Huang ◽  
A. H. Soni
Keyword(s):  
Mathematical Model ◽  
Graph Theory ◽  
Structural Analysis ◽  
Three Dimensional ◽  
Structural Synthesis ◽  
Kinematic Chains ◽  
Piston Cylinder ◽  
General Constraints ◽  
Analysis And Synthesis ◽  
Linear And Nonlinear

Using graph theory and Polya’s theory of counting, the present paper performs structural synthesis and analysis of planar and three-dimensional kinematic chains. The Section 2 of the paper develops a mathematical model that permits one to perform structural analysis and synthesis of planar kinematic chains with kinematic elements such as revolute pairs, cam pairs, springs, belt-pulley, piston-cylinder, and gears. The theory developed is applied to enumerate eight-link kinematic chains with these kinematic elements. The Section 3 of the paper develops a mathematical model that permits one to perform structural analysis and synthesis of multi-loop spatial kinematic chains with higher and lower kinematic pairs. The theory developed is applied to enumerate all possible two-loop kinematic chains with or without general constraints.

II. Current developments in the design and production of three- dimensional curved objects - Computational geometry

1971 ◽  
Vol 321 (1545) ◽  
pp. 187-195 ◽  
Keyword(s):  
Computational Geometry ◽  
Three Dimensional ◽  
Computer Hardware ◽  
Mathematical Representation ◽  
Shape Information ◽  
Accurate Representation ◽  
Analysis And Synthesis ◽  
Computer Based ◽  
Curve And Surface Fitting ◽  
Design And Manufacture

The accurate representation of shape which is essential to engineering design and manufacture conventionally has been achieved by two-dimensional drafting but new computer-based methods are being developed. The mathematical representation, manipulation, analysis and synthesis of shape information in a computer is termed computational geometry. A mathematical representation must take into account not only the capabilities and limitations of computer hardware and software but also those of a mathematically unsophisticated user. A distinction is drawn between the fitting of a mathematical representation to a predesigned object and the design of an object ab initio or by modification of an existing mathematical model. Conventional curve and surface fitting techniques have been found to be unsuitable. Several methods of representation which are intended to overcome these problems are discussed.

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