China's highest level of precision centrifuges came out: stable wins "meteorite" precision super "hair"
We often say that it is rock solid, but it is ten times more stable than vermiculite; we often say that it is as fine as hair, but the radius deviation when it rotates is only 1/80 of the hair. And even if the conditions are so harsh, it is still a super "chainballer": it can make 10 kilograms of objects, through a stable rotation of only 1 nanosecond per time difference, to achieve 100 times the acceleration of gravity.
This is the country's major scientific instrument and equipment development special - high-precision inertial instrument calibration and detection device - to reach the highest load 10kg, relative standard uncertainty 10-6, steady-state linear acceleration 100g and other leading indicators of China's highest level of precision centrifuge. Recently, the Science and Technology Daily reporter entered the General Engineering Research Institute of the China Academy of Engineering Physics to visit this set of "big G value" and "high precision" major scientific instruments.
Precision Centrifuge is the key inspection and calibration equipment for high precision inertial navigation instruments. High-precision inertial navigation is a navigation parameter solving system with gyro and accelerometer as the sensitive device. It can solve the speed and position in the navigation coordinate system according to the output of the inertial device. It can be applied in the fields of aerospace, defense science and technology, surveying and mapping. widely.
In 2011, as one of the first batch of national major scientific instruments and equipment development projects, the General Engineering Institute of China Academy of Engineering Physics launched the “Development and Application of High-Precision Inertial Instrument Calibration and Detection Devicesâ€. This is a truly independent innovation from scratch. Previously, the developed countries of the world with the same level of equipment, even its measurement model, technical route numerical simulation methods, basic algorithms are "secret", not to mention Said design and manufacturing, installation process.
High-precision inertial instrument calibration and detection precision centrifuge development system design technology, control technology, drive technology, manufacturing technology, measurement technology, analysis technology, test technology in one, is a comprehensive system of high requirements, complete each All the work carried the hard work of countless days and nights of the research team of the Chinese Academy of Sciences. In research and development, this technical point is evaluated in terms of relative standard uncertainty. The team starts with basic theoretical analysis and systematically studies and analyzes more than 20 influencing factors affecting the indicator, completing the equipment including its own. Manufacturing, installation, measurement error compensation calculation, earth gravity, ground pulsation, air temperature, humidity, even lunar gravity, celestial movement and other influencing parameters, carry out complicated quantitative analysis and calculation, and use a precision centrifuge under development The system carried out a large number of tests and verifications, and finally established a scientific and reasonable mathematical model for index assessment.
"The stability of unmanned ground is about 10-5, and the high-precision centrifuge requires stability 10 times that of the ground, that is, 10-6. Such precise requirements, the development difficulty behind it can be imagined." The project leader and the party secretary of the Chinese Academy of Sciences, Li Qisheng, told the reporter that in the design, development, installation and testing of the equipment, the overall research team of the Chinese Academy of Sciences has filled a number of blanks in the fields of design, technology, materials and assembly. The two-way high-capacity high-precision air bearing, precision motor, precision measuring system, micro-vibration isolation system and other core components have been independently designed by scientific research personnel. They have applied for 25 patents to promote domestic processing and manufacturing, new materials and other fields. A number of technological advances.
At present, the centrifuge has reached the leading indicators of the maximum load of 10 kg, relative standard uncertainty of 10-6, steady-state linear acceleration of 100g. Its successful development also fills the gap of precision centrifuges with a relative uncertainty of 10-6 in the range of 1g-100g in China.
The reporter saw at the equipment site that the large instrument with a total weight of 2.4 tons and a diameter of about 2.2 meters was installed on a cement platform weighing 2,000 tons and supported by the spring from both the horizontal and vertical directions. In operation, it can rotate an object with a maximum load of 10 kg at a speed of 300 rpm to achieve 100 times the gravitational acceleration. In terms of precise speed control, the time difference between each revolution is only 1 nanosecond; in the dynamic radius change control, the deviation of the shaft caused by centrifugal force is only controlled at 1/80 of the hair.
Researcher Qiu Yong of the Institute said that as a typical military-civilian integration project, the development of precision centrifuges will fill the gaps in the scientific instrument field of large-scale high-precision inertial navigation instrumentation in China, and promote geodetic survey and oil drilling in China. The scientific and technological progress in major areas of national defense, such as aviation, aerospace, precision guidance, etc., and the overall location of civil engineering, military environment simulation, fast acceleration, multi-degree of freedom overload simulation, manned, precision detection and other centrifuges rank among the international advanced level.
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