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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Форма поиска

Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 2. Отображено 2.
27-11-2013 дата публикации

Method for judging critical area of sonic drilling string and maximum stress joint

Номер: CN103413042A
Автор: Bu Changgen, Sun Long
Принадлежит:

The invention provides a method for judging the critical area of a sonic drilling string and a maximum stress joint. The method includes: a, establishing a longitudinal forced vibration simplified mathematical model of the sonic drilling string; b, setting parameters such as total length of the sonic drilling string, length of a single drill pipe and material yield limit; c, subjecting the maximum stress location and the critical area of the sonic drilling string to programming calculation by using related software. By the method, the critical area of the sonic drilling string can be theoretically confirmed and the appearing location of the maximum stress joint of the drilling string can be judged, and cracks or breakages, of the screwed joint, caused by concentration of stress can be avoided. Therefore, drilling efficiency during application of the sonic drilling technology is favorably improved, and damage to machines and tools by audio frequency vibration is reduced.

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Номер записи: 1
18-07-2012 дата публикации

Ultrasonic excitation impact space sampling drill

Номер: CN102589925A
Автор: Bu Changgen, Wang Long, Wei Jingkun
Принадлежит:

The invention relates to an ultrasonic excitation impact space sampling drill. The device mainly comprises an ultrasonic transducer, a pressurizing and clamping surface, a free mass and a drill rod. When a high-frequency AC excitation voltage is supplied to the ultrasonic transducer, the ultrasonic transducer generates longitudinal resonance due to the inverse piezoelectric effect of piezoelectric ceramics, and the variable-amplitude rod at the front end of the ultrasonic transducer amplifies ultrasonic amplitude. The free mass generates high-frequency reciprocating collision between the tail end of the clamped variable-amplitude rod and the drill rod under the excitation and vibration coupling actions of the ultrasonic transducer. The collision impact of the free mass and the vibration of the ultrasonic transducer are transferred to rock via the drill rod. When the impact strength is greater than the crushing strength of the rock, the rock is crushed. Compared with the ultrasonic space ...

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Номер записи: 2