Since the 21st century China research and development of bearing capacity

Introduced or independent research and development in China in the 21st century, large overload sliding bearing, nuclear power millions of units of major equipment such as dynamic bearing scheme relies on design calculation method of the performance is relatively mature, performance is in most cases do not need to specifically set research design verification test, and direct access to the assessment test; Nuclear main pump water lubricated bearing, nuclear power ammonia compressor bearings and rubber bearings, etc. , this kind of design for total life cycle or extreme condition of bearing performance calculation and prediction method are still in research stage, important units or new units bearing design rely on the introduction of technology, the research-type experiment for digestion, absorption, the introduction of technology or the development of autonomous technology is particularly important. Sliding bearing experimental study on the dynamic characteristics of oil film coefficient is bearing subsystem dynamics and the lubrication theory research is an important part of. Identify the dynamic characteristic coefficients of test-bed is mainly bearing test rig and the rotor system Two types of bearing system test bench. The so-called 'upside-down' bearing test rig, its characteristic is hanging test bearings on the shaft, and at the same time as part of the load device. 'Is' bearing test-bed experiment is the feature of bearing for the rotor bearing, its loading device does not include the test bearing, generally USES the simpler structure, the number of rotor bearing system test bench is more, but large less. Such as Mr Kars in Germany university test bench, speed range 0, 30000 / min, the largest wheel diameter is 800 mm, maximum radius of 800 mm, shaft diameter of 50 mm domestic such as zhengzhou machinery research institute, Shanghai steam turbine factory, xi 'an jiaotong university and other institutions which have larger rotor bearing test rig, qin with dynamic rigidity of the machine tool plant has domestic first of dynamic and static pressure bearing test-bed, dn value 1. 2 million ~ 1. 5 million, dongfang has the current domestic largest radial bearing dynamic characteristics of the test-bed, Harbin electric group co. , LTD. Of the 3000 largest nations in the thrust bearing test rig, which also in the construction of the country's largest radial bearing test-bed in the aspects of water lubricated bearing test rig: simulating the actual working condition of chongqing university independently set up several more medium and under the condition of the ship propulsion system comprehensive performance experimental platform. China also established a ship heavy industry group 719 bearing comprehensive performance test. Xi 'an jiaotong university has established the nuclear main pump half size simulation test bench. At the same time, the electricity company, draws, chong DE sliding bearing are positive in terms of main pump bearing test bench, built by the test stand is mainly on the basis of theoretical research, but not enough or limited to a single test condition simulation technology research, makes experimental research on system comprehensive enough. In the aspects of gas bearing test rig: xi 'an jiaotong university to foil design established a relatively perfect and advanced experimental platforms and has a good condition and hardware support, including high-speed turbine in low temperature gas bearing vibration test bench, high speed, low temperature turbine performance test bench, etc. ; Harbin industrial university three degrees of freedom, five degree of freedom air floated platform using gas ball bearings, including plane air bearing, torus throttle gas ball bearings, small throttling gas ball bearings of engineering thermal physics, Chinese Academy of Sciences institute of holes, different throttling aerostatic bearing slotted line of gas dynamic pressure bearing and static pressure bearing has carried on the research and development design, mainly used in micro small turbine expander and high-speed motor. In experimental test the test bench and nonlinear test system with perfect in testing technology, high precision displacement sensor of oil film thickness, the measurement methods such as SEM, further proven onlookers oil film lubrication mechanism of the friction pair more precise analysis of the dynamic oil film bearing, oil film dynamics, sensitivity analysis and flow dynamic pressure lubrication characteristics such as body, to better explain the friction pair in the early design beyond the material allowable PV value can still work normally. In advanced testing technology and innovation in China with the international advanced level there is still a certain gap, to track the research mode, high pressure lubrication mechanism of the friction pair, the extreme conditions of friction and wear rule and test method research started relatively late. Due to the limitation of measuring tools and methods, the oil film circumferential temperature changes etc. At present has yet to be precise measurements: the CPC membrane rupture area, and the theoretical analysis of temperature, bearing temperature, the feed back problem, flow problem, bearing thermal elastic deformation, non-newtonian flow is difficult to model an accurate simulation, such as body, still need to establish a simpler but more accurate model to simplify the numerical calculation. Is caused by the gap in the experimental condition, our country's enterprises often lack of assessment test, thus determined in the test model and the accuracy of the data has a big gap compared with abroad. In enterprises, bearing experiment technology is aimed at comprehensive inspection of the products