Ovim help open the eye in the sky "show the wisdom of science and technology
In September 25, 2016, the 500 meter calibre spherical radio telescope (FAST) of the national major science and technology infrastructure was officially opened. Politburo member and vice premier Liu Yandong attended the opening ceremony and read Xi Jinping's letter.
Liugong group party secretary, chairman Ceng Guangan, Liuzhou OVM machinery Limited by Share Ltd (hereinafter referred to as the OVM) general manager Liu Xuan, project manager and assistant general manager Zhang Shenghua ouweimu engineering company Cheung Kwok Keung as the project participants, invited to participate in the event, witnessed their participation in the construction of the "eye" -- the world's largest 500 meter aperture spherical the radio telescope officially opened the world star about.
As everyone knows, 500m aperture spherical radio telescope (FAST project), belonging to the state "11th Five-Year" major scientific projects, is the largest single aperture radio telescope, 2.25 times higher than the U.S. 300m caliber Arecibo world largest telescope sensitivity, the equivalent of 30 football fields, can achieve the 5 basic science: neutral patrol hydrogen, observations of pulsars in the universe, on the extreme loading material structure and physical laws, under the state leading international VLBI network, detection of interstellar molecules -- a study of star formation and evolution of space exploration and the origin of life, the search for interstellar communication signals -- looking for extraterrestrial civilization, keep the leading position in the world in the next 20~30 years, major the meaning of space exploration.
One of the three major independent innovations in FAST engineering -- a cable net to realize the active transformation of the reflector
The three major innovation of FAST project:
1, make use of the unique Guizhou natural Karst depressions site;
2. The application of active reflector technology to the tracking and observation of celestial bodies;
3, light cable drag feed support to tens of tens of tons of platform.
OVM R & D core structure of cable network -- reflecting surface active displacement which is one of the three independent innovation project FAST.
In order to realize the function of the active transformation of the reflector, the demand for the cable net structure is especially high, which mainly includes the following aspects:
1, networking cable needs to meet the requirements of 500MPa fatigue stress amplitude (the general industry requirement is only 250MPa), and the cable length accuracy needs to be controlled within or below 1mm.
2. The network node needs to meet the deflection requirements of the relative cable net method of + 5 degrees, so as to realize the active modification of the cable net.
3, the connection mechanism of mesh reflector panel needs to meet the adaptive matching requirements of reflector unit and displacement cable net, avoiding the additional load added to the reflector during the cable mesh displacement process, and achieving the faceplate maintenance of the panel unit.
4, cable net for suspended splicing at high altitude, consisting of 6670 main cable (1454 kinds of specifications), 2225 nodes (565 specifications), disc 2225 panel connecting mechanism (565 kinds of specifications), 2225 cable (2225 each cable length are different) cable net a.
The FAST project was established in 1993, and the cable network program was designed in 2000. For a long time after the start of the scheme design, the owners searched for excellent cable manufacturers in the world to carry out the development of ultra-high stress cables, and failed to achieve satisfactory results. In 2012, FAST group began to cooperate in R & D and OVM, finally get the actual research results.
Ouweimu founded 50 years, has been focusing on scientific research, and improve the quality of products, always stand in the forefront of the domestic industry. This time they in the original leading domestic cable anchorage technology, continuous improvement, bold innovation, based on research of nearly 4 years, finally developed the first can meet the engineering requirements of the FAST cable is to meet the stability of 500MPa fatigue stress amplitude of cable, the company has been ouweimu FAST engineering construction units is the core. Only one field of prestressed FAST engineering units, Guangxi district is only a construction unit.
For FAST cable net structure engineering technical difficulties, OVM main technological innovation is as follows:
1. The technology of cold cast extrusion compound anchorage was first created to solve the technical problem of realizing high fatigue stress amplitude of cable 500MPa.
2, first set up the combination of high strength prestressed steel wire and steel strand.
3. The adaptive connection mechanism of the reflector unit is invented.
4. The joint assembly of the space cable network connection was invented. It satisfies the requirement of the cable relative to the cable net radial deviation of 5 degrees. The structure form is compared with the original plan. It has the advantages of safety and reliability, precise positioning and light weight.
5. The new construction technology of super large cable network for air weaving was developed.
The innovation of technology and process, OVM company has applied for and obtained 8 invention patents, 8 utility model patents.
The innovation of key technology laid the foundation for the project to be completed by time. At the same time, it saved about 480 million of the construction cost for the project and the country. The success of FAST project, marking the OVM in national innovation ability of scientific research, technology and even the world project once again to get a promotion, to the large-scale manufacturing enterprises and a major step forward.
