Flow control valve generally consists of constant pressure difference reducing valve and throttle valve.When it works under the condition of high differential pressure and flow, the pressure loss of reducing valve in-...Flow control valve generally consists of constant pressure difference reducing valve and throttle valve.When it works under the condition of high differential pressure and flow, the pressure loss of reducing valve in-stalled in main loop will get increased and the hydraulic oil temperature will be increased as well. A digital pilotflow control valve is studied in this paper. The main stage is a cartridge valve based on the flow amplifying princi-ple. The pilot stage is digital flow control valve which consists of digital valve and constant pressure difference re-ducing valve. The digital valve controlled by PWM signal has some characteristics such as less throttling loss andgood repeatability. The high pressure loss and hydraulic oil temperature will be effectively reduced by using con-stant pressure difference reducing valve in the small flow pilot circuit. Through theoretical derivation and simula-tion research, the feasibility of this valve is verified, and some conclusions are drawn for the relationships betweenthe performance and structure parameters, which provides theoretical basis for their design.展开更多
Axial piston pump is fluid-solid coupling mechanical equipment. Its vibration characteristic is compli-cated when working. This paper uses the characteristic line-fast Fourier transform method （MOC - FFT） in theplun...Axial piston pump is fluid-solid coupling mechanical equipment. Its vibration characteristic is compli-cated when working. This paper uses the characteristic line-fast Fourier transform method （MOC - FFT） in theplunger pump to study vibration characteristics caused by fluid-solid coupling. Using the MOC to solve the fluid-solid interaction＇ s （FSI） partial differential equations （ 1 ）, then the vibration characteristics of pipeline system intime domain can be achieved. Using the fast Fourier transform method, the natural frequencies of the piping sys-tem can be obtained. It has the advantage of characteristic line method for the coupling vibration model is clear,easy to calculate; And using the method of fast Fourier transform the vibration characteristics to the frequency do-main. According to study the vibration characteristics in the frequency domain, this paper achieved the frequencywhich the type of A10V pump should be avoided when working and change rules of the angle of swash plate, pres-sure and the speed of rotation how to affect the intensive frequency vibration spectrum which is caused by the FSI.展开更多
基金supported by National Natural Science Foundation of China ( No. 51205271)Specialized Research Fund for the Doctoral Program of Higher Education ( No. 20121402120002)
文摘Flow control valve generally consists of constant pressure difference reducing valve and throttle valve.When it works under the condition of high differential pressure and flow, the pressure loss of reducing valve in-stalled in main loop will get increased and the hydraulic oil temperature will be increased as well. A digital pilotflow control valve is studied in this paper. The main stage is a cartridge valve based on the flow amplifying princi-ple. The pilot stage is digital flow control valve which consists of digital valve and constant pressure difference re-ducing valve. The digital valve controlled by PWM signal has some characteristics such as less throttling loss andgood repeatability. The high pressure loss and hydraulic oil temperature will be effectively reduced by using con-stant pressure difference reducing valve in the small flow pilot circuit. Through theoretical derivation and simula-tion research, the feasibility of this valve is verified, and some conclusions are drawn for the relationships betweenthe performance and structure parameters, which provides theoretical basis for their design.
基金supported by Natural Science Foundation of Shanxi Province, Project ( No. 2014011024-2)
文摘Axial piston pump is fluid-solid coupling mechanical equipment. Its vibration characteristic is compli-cated when working. This paper uses the characteristic line-fast Fourier transform method （MOC - FFT） in theplunger pump to study vibration characteristics caused by fluid-solid coupling. Using the MOC to solve the fluid-solid interaction＇ s （FSI） partial differential equations （ 1 ）, then the vibration characteristics of pipeline system intime domain can be achieved. Using the fast Fourier transform method, the natural frequencies of the piping sys-tem can be obtained. It has the advantage of characteristic line method for the coupling vibration model is clear,easy to calculate; And using the method of fast Fourier transform the vibration characteristics to the frequency do-main. According to study the vibration characteristics in the frequency domain, this paper achieved the frequencywhich the type of A10V pump should be avoided when working and change rules of the angle of swash plate, pres-sure and the speed of rotation how to affect the intensive frequency vibration spectrum which is caused by the FSI.
