DEVICE FOR MEASURING SOUND SOURCE DISTRIBUTION IN THREE-DIMENSIONAL SPACE

• US 20120216619A1
• Filed: 11/01/2010
• Published: 08/30/2012
• Est. Priority Date: 11/10/2009
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Fukuchi, Yuichi, Teramura, Minoru
• Granted Patent: US 8,950,262 B2
• Time in Patent Office: Days
• US Class Current: 73/645
• CPC Class Codes: G01H 9/002 for representing acoustic field distribution sonar systems for imaging G01S7/56, G01S15/89; acoustic holography G03H3/00
• CPC Class Codes: G01M 17/007 Wheeled or endless-tracked vehicles G01M17/08 takes precedence
• CPC Class Codes: G01M 9/067 visualisation
• CPC Class Codes: G01P 3/806 in devices of the type to be classified in G01P3/68

Abstract

A device for measuring a sound source distribution in three-dimensional space is provided in which tracer particles included in a steady flow around an object (12) are irradiated with a two-dimensional laser sheet (Ls) within an x-y plane at two times having a very short time interval, images of the irradiated tracer particles are taken from two intersecting directions in the laser sheet (Ls) by imaging means (32A, 32B), and two in-plane velocity components of the tracer particles in the laser sheet (Ls) and one out-of-plane velocity component perpendicular to the laser sheet (Ls) are measured based on the images taken at the two times. Further, the velocity field of the three velocity components in three-dimensional space is measured by obtaining three velocity components within a plurality of planes spaced apart in a z-axis direction perpendicular to the laser sheet (Ls) and stacking the three velocity components within the plurality of planes in the z-axis direction. Thus, since the sound source distribution measuring means measures the sound source distribution around the object (12) from the velocity field of the three three-dimensional velocity components based on the Proudman theorem, it is possible to measure the sound source distribution in three-dimensional space with good precision.

Claims

1. A device for measuring a sound source distribution in three-dimensional space, the device comprising:

a particle image velocimetry system that irradiates, with laser light, tracer particles included in a flow field around an object at two times that are separated by a very short period of time, and measures a velocity field of three velocity components in three-dimensional space from images at the two times of the tracer particles irradiated with the laser light taken by an imaging device; and

sound source distribution measuring device that measures a sound source distribution around the object from the velocity field of the three three-dimensional velocity components.

2. The device for measuring a sound source distribution in three-dimensional space according to claim 1, wherein

the particle image velocimetry system irradiates tracer particles in the flow field with a two-dimensional laser sheet, obtains the three velocity components within a plurality of planes while moving the laser sheet, and measures the velocity field by stacking the three velocity components within the plurality of planes with the flow as a steady flow.

3. The device for measuring a sound source distribution in three-dimensional space according to claim 2, wherein

the particle image velocimetry system comprises laser sheet irradiating means device and the imaging device supported on a moving member that can be moved along a guide member disposed in a direction parallel to a laser beam that forms the laser sheet, the laser sheet irradiating device and the imaging device being moved while maintaining a fixed positional relationship.

4. The device for measuring a sound source distribution in three-dimensional space according to claim 1, wherein

the sound source distribution measuring device measures a sound source distribution around the object from the velocity field of the three three-dimensional velocity components based on the Proudman theorem.

5. The device for measuring a sound source distribution in three-dimensional space according to claim 2, wherein

the sound source distribution measuring device measures a sound source distribution around the object from the velocity field of the three three-dimensional velocity components based on the Proudman theorem.

6. The device for measuring a sound source distribution in three-dimensional space according to claim 3, wherein

the sound source distribution measuring device measures a sound source distribution around the object from the velocity field of the three three-dimensional velocity components based on the Proudman theorem.