To adapt to the development of high-performance and high-power full-speed steam turbines

it is necessary to develop titanium alloy low-pressure final stage ultra-long blades. Experimental research on dynamic vibration characteristics of newly developed blades is an essential part of blade design and development. According to the characteristics of titanium alloy super-long blades

this paper conducts technical research on titanium alloy blade wiring spot welding technology

super-long blade vibration method

strain gauge placement selection and vibration signal identification. On this basis

the wireless test and analysis technology is used to successfully carry out the dynamic vibration characteristics test for the titanium alloy blade with the longest full speed of 1 450 mm in China

which is newly developed by a manufacturer and obtained the "3-coincide point" resonance speed and dynamic characteristics of the titanium alloy long blade. The frequency and other dynamic vibration characteristics provide an important measurement basis for the design phase of the 1 450 mm titanium alloy long blade and the safe operation during the production phase. The test methods and results have reference significance and practical value for the research and development of long blades of steam turbines.