AERODYNAMIC SOUND REDUCTION STRUCTURE

PROBLEM TO BE SOLVED: To provide an aerodynamic sound reduction structure which can reduce aerodynamic sound, over a relatively long period, by a porous body of open cells having a low-cost and simple structure. SOLUTION: A porous body 10a of open cells reduces aerodynamic sound. The porous body 10a...

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Hauptverfasser:	SUEKI TAKEYUKI, TAKAISHI TAKEHISA
Format:	Patent
Sprache:	eng
Schlagworte:	BODY DETAILS OR KINDS OF RAILWAY VEHICLES CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES PERFORMING OPERATIONS RAILWAYS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING VEHICLES IN GENERAL VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an aerodynamic sound reduction structure which can reduce aerodynamic sound, over a relatively long period, by a porous body of open cells having a low-cost and simple structure. SOLUTION: A porous body 10a of open cells reduces aerodynamic sound. The porous body 10a is stuck through an adhesive to the upper and lower surfaces of a horn 9b, along the length direction thereof with a predetermined width within a range of not contacting a trolley wire 1a. The porous body 10a of open cells, internally containing air bubbles, has minute holes in the wall of the air bubbles and has a three-dimensional frame mesh structure. A porous body 10a of small cells is generally selected, when sound absorption effect is aimed at, and a porous body 10a of large cells is selected, when aerodynamic sound reduction is aimed at. A porous body 10a, having a cell range of 11-16 representing the number of air bubbles on a line of 25 mm (1 inch), is especially preferable. COPYRIGHT: (C)2008,JPO&INPIT