Electric liquid harmonic oscillation high frequency fatigue-testing machine and control method of electric liquid harmonic oscillation high frequency fatigue-testing machine

Abstract

The invention provides an electric liquid harmonic oscillation high frequency fatigue-testing machine which comprises a working table, a two-position three-way double freedom electric liquid control valve, a single outlet rod main hydraulic cylinder, two upright columns, two elevating holding hydraulic cylinders and a transverse beam, wherein the two upright columns are arranged at the two sides above the working table; the two elevating holding hydraulic cylinders are arranged at the outer sides of the upright columns above the working table; the transverse beam is arranged above the working table; the oil outlet of the two-position three-way double freedom electric liquid control valve is communicated with the rodless end of a piston rod of the single outlet hydraulic cylinder; a displacement sensor is arranged at the rodless end of the piston rod of the single outlet hydraulic cylinder; the piston rod end of the single outlet hydraulic cylinder is connected with a lower clamp; the bottoms of the two elevating holding hydraulic cylinders are connected with the working table; the top ends of the piston rods of the two elevating holding hydraulic cylinders are connected with the transverse beam; the transverse beam can be sleeved on the upright columns in a way of sliding up and down; the middle part of the transverse beam is connected with a load sensor; and the lower part of the load sensor is connected with an upper clamp. The invention also provides a control method of the testing machine. According to the electric liquid harmonic oscillation high frequency fatigue-testing machine, output load and oscillation amplitude are kept in working at a high frequency section, thereby realizing the harmonic oscillation fatigue-test is realized.

Description

technical field [0001] The invention relates to a fatigue testing machine and a control method thereof. Background technique [0002] The electro-hydraulic fatigue testing machine has the characteristics of large vibration output load. Generally, the electro-hydraulic fatigue testing machine is used for fatigue testing of components with large structures and high load requirements. However, due to the limitation of the bandwidth of the servo valve, the electro-hydraulic fatigue test The operating frequency of the machine is between 2Hz and 100Hz. MTS Corporation of the United States and Michigan Technological University jointly developed a voice coil servo valve control scheme, which increased the operating frequency of the electro-hydraulic fatigue test system to 1000Hz. There is coupling interference in the system vibration frequency, amplitude and zero point, making it difficult to achieve high-precision control. The team of Professor Ruan Jian from Zhejiang University ...

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Problems solved by technology

MTS Corporation of the United States and Michigan Technological University jointly developed a voice coil servo valve control scheme, which increased the operating frequency of the electro-hydraulic fatigue test system to 1000Hz. There is coupling interference in the vibration frequency, amplitude and zero point of the system, making it difficult to achieve high-precision control

The team of Professor Ruan Jian from Zhejiang University of Technology in China has successfully increased the working frequency of the electro-hydraulic fatigue test bench to 2000Hz by using the 2D high-speed rotary valve to control the double-rod hydraulic cylinder technology. and severe amplitude attenuation problems

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