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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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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 7. Отображено 7.
09-06-2023 дата публикации

Method and system for calculating transient power angle stability margin of power system

Номер: CN116247660A
Автор: XU TAISHAN, BAO YANHONG, REN XIANCHENG, WU FENG, ZHANG JINLONG, JIANG WEI, YANG KEXIN, DU XIANGFEI
Принадлежит:

The invention discloses a method and a system for calculating a transient power angle stability margin of a power system. The method comprises the following steps: determining a power grid energy balance fulcrum corresponding to each simulation time point after disturbance; aiming at each time point, dividing the synchronous generator into two synchronous generator sets by taking an energy balance fulcrum as a boundary, and determining leading or lagging attributes of the synchronous generator sets according to inertia center angles of generator rotors in the two synchronous generator sets; according to the difference between the rotor inertia center angles of the leading generator set and the lagging generator set, determining a time period and a sub-time period of stability margin calculation; and according to the inertia center frequency of the rotor of the synchronous generator, the rotational inertia and the frequency of the synchronous generator and the number of time points at all ...

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Номер записи: 1
16-05-2023 дата публикации

Method and system for calculating influence degree of synchronous generator on transient power angle stability of power grid

Номер: CN116127742A
Автор: XU TAISHAN, BAO YANHONG, REN XIANCHENG, WU FENG, ZHANG JINLONG, JIANG WEI, YANG KEXIN, DU XIANGFEI
Принадлежит:

The invention discloses a method for calculating the influence degree of a synchronous generator on the transient power angle stability of a power grid. The method comprises the steps of determining a power grid energy balance fulcrum corresponding to each simulation time point after preset disturbance; aiming at each simulation time point, dividing synchronous generators in the power grid into two synchronous generator sets by taking an energy balance fulcrum as a boundary, and determining leading or lagging attributes of the synchronous generator sets according to inertia center angles of generator rotors in the two synchronous generator sets; according to a relative rotor inertia center angle between the preceding synchronous generator set and the lagging synchronous generator set after disturbance, determining a time period of transient power angle stability influence degree calculation; and calculating the influence degree of the synchronous generator on the transient power angle stability ...

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Номер записи: 2
15-06-2011 дата публикации

CRTS II type slab ballastless track cement asphalt (CA) mortar

Номер: CN0102093000A
Автор: DEYU KONG, HONGGUI HU, XIANGFEI DU, JINDA MAO, SU WEI, CHENGCHANG MA, KONG DEYU, HU HONGGUI, DU XIANGFEI, MAO JINDA, WEI SU, MA CHENGCHANG
Принадлежит:

The invention discloses a CRTS II type slab ballastless track cement asphalt (CA) mortar. The mortar is prepared by mixing cement, fine sand, expanding agent, aluminium powder, water, polycarboxylic water-reducing agent, emulsified asphalt, silica sol and defoaming agent. The raw materials contain the following components in parts by weight: 40-55 parts of cement, 3-7 parts of expanding agent, 0.00275-0.005 part of aluminium powder, 38-57 parts of fine sand, 0.8-1.1 parts of polycarboxylic water-reducing agent, 1.0-2.0 parts of silica sol, 0.0038-0.0072 part of defoaming agent, 13.0-15.7 parts of water, 13.9-16.9 parts of emulsified asphalt and 0-0.051 part of air entraining agent. In the preparation of the CRTS II type slab ballastless track CA mortar, by adding nanometer silica sol which only accounts for 1.0-2.0% of the total dosage of dry powder and is used as the nanometer thickener of the CA mortar, the rheological behavior of the CA mortar can be adjusted effectively, the layering ...

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Номер записи: 3
30-05-2023 дата публикации

Transient power angle stability influence degree calculation method and system based on energy deviation ratio

Номер: CN116186979A
Автор: XU TAISHAN, BAO YANHONG, REN XIANCHENG, WU FENG, ZHANG JINLONG, JIANG WEI, YANG KEXIN, DU XIANGFEI
Принадлежит:

The invention discloses a transient power angle stability influence degree calculation method and system based on an energy deviation rate. The method comprises the steps of determining a power grid energy balance fulcrum corresponding to each simulation time point after preset disturbance; aiming at each simulation time point, dividing nodes in the network equation into two node sets by taking an energy balance fulcrum as a boundary, and determining leading or lagging attributes of the node sets according to inertia center angles of a synchronous generator rotor associated with the nodes in the two node sets; according to a relative rotor inertia center angle between the post-disturbance leading node set and the lag node set, determining a time period for calculating the transient power angle stability influence degree; and according to grid-connected active power and node set attributes of the equipment at a simulation time point through the connected nodes, calculating energy deviation ...

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Номер записи: 4
02-05-2023 дата публикации

Switching control method for network-forming inverter with phase supporting capability under fault

Номер: CN116054233A
Автор: WU FENG, BAO YANHONG, XU TAISHAN, ZHENG JIANYONG, ZHANG JINLONG, REN XIANCHENG, MEI FEI, LI KAI, MEI JUN, WANG BIN, GUO JIAWEI, JIANG WEI, DU XIANGFEI, YANG KEXIN
Принадлежит:

The invention discloses a switching control method for a network-constructed inverter with a phase supporting capability under a fault, and the method comprises the steps: enabling the network-constructed inverter to normally work in a voltage source control mode, inputting an angular velocity compensation control link based on the phase change of a power grid when the current is detected to be out of limit under the fault, and enabling the current to be out of limit; the actual phase difference between the inverter output internal potential phase and the power grid is reduced, and meanwhile the phase supporting capacity is provided. A PI control link is introduced into the current amplitude limiting control module, and the situation that the amplitude of the internal potential changes drastically due to current amplitude limiting under a fault is improved. Smooth switching of a voltage source control mode and a current source control mode is achieved through internal potential phase and ...

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Номер записи: 5
23-06-2023 дата публикации

Monocular vision positioning method based on high resolution

Номер: CN116309833A
Автор: YANG JIA, HUANG JIAN, DU XIANGFEI, HUANG YONG, ZHANG ZHENGHAO, MA HAORAN, YANG YANG, HU DONG
Принадлежит:

The invention relates to the technical field of visual positioning, in particular to a monocular visual positioning method based on high resolution, which comprises the following steps of: decoding a video stream to obtain an original decoded image frame, graying the original decoded image frame, and constructing a Gaussian pyramid; then selecting a proper image layer to perform image segmentation according to the distance of the target, taking the segmented area as a primitive, and mapping the primitive to a proper size by applying the mapping relation of a pyramid; secondly, shape recognition is carried out with the primitives as units, effective target primitives are determined according to the position relation between the primitives, key points of the effective primitives are extracted, and the key points are matched with target representation coordinates; and finally, resolving the position and attitude of the target identifier by using a PnP method. According to the method, on the ...

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Номер записи: 6
13-04-2021 дата публикации

Upper limb fixing band for prone position cervical vertebra surgery

Номер: CN212939941U
Автор: XU JUAN, DU XIANGFEI, 徐娟, 杜祥飞
Принадлежит: JIANGSU PROVINCE HOSPITAL FIRST AFFILIATED HOSPITAL WITH NANJING MEDICAL UNIV, JIANGSU PROVINCE HOSPITAL (THE FIRST AFFILIATED HOSPITAL WITH NANJING MEDICAL UNIVERSITY), 江苏省人民医院(南京医科大学第一附属医院)

The utility model discloses an upper limb fixing band for prone position cervical vertebra surgery, and relates to the technical field of medical fixing bands. The prone position cervical vertebra operation upper limb fixing band comprises a jacket surface and a first air convection device blanket, and a second air convection device blanket is fixed to the top of the jacket surface. According to the upper limb fixing band for the prone position cervical vertebra operation, the jacket face is arranged on the back of a patient, the two upper limbs of the patient are placed in the oversleeves, so that the two upper limbs of the patient are located on the soft plastic and adhere to each other through the third hook-and-loop fasteners at the opening and closing openings of the oversleeves, and therefore the two upper limbs of the patient can be fixed; meanwhile, the second Velcro on the first air convection device blanket is adhered to the first Velcro, so that the position of the first air ...

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Номер записи: 7