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Paper Abstract and Keywords
Presentation 2013-02-15 15:05
Probability Distributions of Annual Average Temperature and Relative Humidity for the Time of Wetness in Japan
Masahiro Sotoma, Takashi Sawada (NTT) R2012-75 EMD2012-106 Link to ES Tech. Rep. Archives: EMD2012-106
Abstract (in Japanese) (See Japanese page) 
(in English) The existence of liquid on a metallic surface is a significant factor for the corrosion. Time of wetness (TOW) is specified in ISO 9223 and used as an index of period when a metallic surface is covered by liquid films of electrolyte to be capable of causing atmospheric corrosion. Hourly Temperature and relative humidity are required for calculating TOW. On the other hand, the simplified method using annual temperature and relative humidity has been proposed, and applied so far. The feature of this simplified method is that probability functions are used. However, the precision of result using this simplified method in Japan is not so good, because proposed parameters of probability functions are fitted to the world-wide meteorological observation. This paper show appropriate parameters of probability functions fitting to the Japanese meteorological phenomena and the improvement of the precision of TOW using annual temperature and relative humidity.
Keyword (in Japanese) (See Japanese page) 
(in English) Time of Wetness / Corrosion / Probability / Meteorological Data / Reliability / Risk Analysis / Risk Assessment /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 431, R2012-75, pp. 17-22, Feb. 2013.
Paper # R2012-75 
Date of Issue 2013-02-08 (R, EMD) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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reproduction
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF R2012-75 EMD2012-106 Link to ES Tech. Rep. Archives: EMD2012-106

Conference Information
Committee EMD R  
Conference Date 2013-02-15 - 2013-02-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Sumitomo Wiring System, Ltd 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To R 
Conference Code 2013-02-EMD-R 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Probability Distributions of Annual Average Temperature and Relative Humidity for the Time of Wetness in Japan 
Sub Title (in English)  
Keyword(1) Time of Wetness  
Keyword(2) Corrosion  
Keyword(3) Probability  
Keyword(4) Meteorological Data  
Keyword(5) Reliability  
Keyword(6) Risk Analysis  
Keyword(7) Risk Assessment  
Keyword(8)  
1st Author's Name Masahiro Sotoma  
1st Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
2nd Author's Name Takashi Sawada  
2nd Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
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Date Time 2013-02-15 15:05:00 
Presentation Time 25 minutes 
Registration for R 
Paper # R2012-75, EMD2012-106 
Volume (vol) vol.112 
Number (no) no.431(R), no.432(EMD) 
Page pp.17-22 
#Pages
Date of Issue 2013-02-08 (R, EMD) 


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