Comparison of jet pipe servo valve with flapper nozzle servo valve / COMPARISON OF RAINFALL DISTRIBUTION BETWEEN GROUND MEASUREMENTS AND DATA CAPTURE FROM SATELLITE IN CA RIVER BASIN

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Tác giả: Luu Thu Thuy Hoang, Thi Thu Hien Le, Xuân Hồng Sơn Phạm, Thiên Phúc Trần

Ngôn ngữ: vie; Vie

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Thông tin xuất bản: Tạp chí phát triển khoa học và công nghệ, Tạp chí Khoa học Trường Đại học Sư phạm Hà Nội: Khoa học Tự nhiên, 20172019

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ID: 489234

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Electro-hydraulic servo valves (EHSVs) serve as an interface between electrical devices and hydraulic systems. They are capable of converting low power electrical input into movement of a spool to control precisely high power, low speed hydraulic actuators. Nowadays, jet pipe electro-hydraulic servo valve and flapper nozzle electro-hydraulic servo valve are typical two-stage control flow servo valve and are the most popular in use. This paper recommends and compares characteristics, working principle and structure for two kinds of servo valve. Besides, the simulation was carried out in a commercially software of Ansys, hence some features of jet pipe servo valve such as outstanding advantages of working feature or reliability are analysed.Van servo điện thủy lực giữ nhiệm vụ kết nối giữa các thiết bị điện với các hệ thống thủy lực. Chúng có khả năng biến đổi năng lượng điện thấp ở đầu vào thành chuyển động của con trượt van để điều khiển các cơ cấu chấp hành thủy lực có tốc độ thấp và nguồn năng lượng cao một cách chính xác. Hiện nay van servo vòi phun điện thủy lực và van servo vòi phun-bản chắn điện thủy lực là hai loại van servo điều khiển lưu lượng hai cấp điển hình được sử dụng phổ biến nhất. Bài báo này giới thiệu và so sánh các đặc điểm, nguyên lý làm việc và kết cấu của hai loại van servo này. Ngoài ra, thông qua mô phỏng các đặc tính làm việc của hai loại van servo bằng phần mềm Ansys, tiến hành phân tích những ưu thế nổi bật về đặc tính làm việc và độ tin cậy của van servo vòi phun được thực hiện.This paper presents a comparison of four different rainfall data sources: rainfalls from TRMM and GPM satellites, PERSIANN system, and in-situ measurements at meteorological stations. The data from TRMM and GPM satellites have been used by many countries. The comparisons of rainfall data from satellites or the online metadata system with in-situ measurement present a similar pattern of spatial distribution between these resources but the amounts of rainfall are quite different

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