{"_buckets": {"deposit": "eac4b3a1-354b-4c3b-8a4f-a6cdd0ed48d1"}, "_deposit": {"id": "7359", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "7359"}, "status": "published"}, "_oai": {"id": "oai:nagoya.repo.nii.ac.jp:00007359"}, "item_10_alternative_title_19": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u8a00\u8a9e\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "Detection of a Rotor Crack Using Nonstationary Response (Change of Maximum Amplitude in Nonstationary Vibration Due to the Direction of Unbalance)"}]}, "item_10_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2006-02", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "714", "bibliographicPageEnd": "323", "bibliographicPageStart": "316", "bibliographicVolumeNumber": "72", "bibliographic_titles": [{"bibliographic_title": "\u65e5\u672c\u6a5f\u68b0\u5b66\u6703\u8ad6\u6587\u96c6 C\u7de8"}]}]}, "item_10_description_4": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "In order to detect a transverse crack due to fatigue, most of the researches have so far paid attention to resonances of steady-state oscillations due to a crack and proposed diagnosis systems utilizing those vibration phenomena. However, in a practical view point, these diagnosis systems have the following defects: (1)The probability that a resonance due to a crack occurs in the rated speed range is small. (2)It is very dangerous to observe vibration characteristics in resonance ranges spending long time. In this paper, we propose a new method utilizing the changes of vibration phenomena due to a crack in a nonstationary oscillation during start up of a rotating machinery. The advantage of this method is that we can check the signals denoting the occurrence of a crack in a wide speed range by a single sweep and also can avoid the operation in dangerous resonance ranges. 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