{"title":"A note on the response characteristics of the VACM compass","authors":"S. Patch, R. Beardsley, S. Lentz","doi":"10.1109/CURM.1990.110899","DOIUrl":null,"url":null,"abstract":"Several simple laboratory experiments have been conducted to study the dynamic behavior of the vector averaging current meter (VACM) compass. These experiments demonstrate that the combined eddy current and bearing friction torque on the compass magnet is proportional to the angular velocity difference between the compass magnet and housing. This combined friction torque tends to critically damp the free oscillation of the compass as originally intended by the compass's designers. Step-forcing experiments on the six compasses indicate all (undamped) resonant period of 3-5 s at 41 degrees N. Periodic forcing experiments with one compass yield a more accurate determination of the resonant period of 4.0 s.<<ETX>>","PeriodicalId":364128,"journal":{"name":"Proceedings of the IEEE Fourth Working Conference on Current Measurement","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1990-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the IEEE Fourth Working Conference on Current Measurement","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/CURM.1990.110899","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
Several simple laboratory experiments have been conducted to study the dynamic behavior of the vector averaging current meter (VACM) compass. These experiments demonstrate that the combined eddy current and bearing friction torque on the compass magnet is proportional to the angular velocity difference between the compass magnet and housing. This combined friction torque tends to critically damp the free oscillation of the compass as originally intended by the compass's designers. Step-forcing experiments on the six compasses indicate all (undamped) resonant period of 3-5 s at 41 degrees N. Periodic forcing experiments with one compass yield a more accurate determination of the resonant period of 4.0 s.<>
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