Abstract
In order to avoid the occurrence of the resonance of the twin screw pump under the periodic change of the fluid, the mechanical performance of the twin screw pump is optimized. To simplify the screw rotor, the vibration mechanical model that the screw rotor, using theoretical methods to solve the first order natural frequency is 525.9835Hz, then using Ansys software to carry out modal analysis under different constraint conditions on the screw rotor, the modal that the screw rotor, the finite element modal analysis of the screw rotor in spring damping under constraint the 526.4Hz theory and the results of software calculation error of only 0.08%, prove the accuracy of the finite element modal damping spring constraint model of screw rotor modal calculation, the results can provide a basis for optimization of mechanical properties of double screw pump.
Highlights
Double screw pump is a fluid driven device, its core components are a couple of intermeshing screw rotor, with high-speed rotation of the screw, complete inhalation, transport and discharge of the three continuous cycle of process fluid, fluid driven transport task [1]
In the design phase of the rotors, in addition to considering the factors of screw strength, dimensional accuracy, tolerance, need to assess the dynamic characteristics in the actual operation process, especially the occurrence of periodic fluid may screw rotor periodic changes in the strong resonance, which will directly affect the normal operation of double the screw pump, this paper through the ANSYS software Workbench for finite element analysis of screw constraint modal analysis, the natural frequency and vibration mode
In view of the screw rotor supported by tapered roller bearings, the constrained modal analysis to coincide with the actual constraint state, this paper adopts different constraint models to simulate the actual bearing constraints, through the analysis and comparison of the natural frequency and vibration mode, obtain more accurate analysis results to avoid the resonance of double screw pump at work
Summary
Double screw pump is a fluid driven device, its core components are a couple of intermeshing screw rotor, with high-speed rotation of the screw, complete inhalation, transport and discharge of the three continuous cycle of process fluid, fluid driven transport task [1]. In view of the screw rotor supported by tapered roller bearings, the constrained modal analysis to coincide with the actual constraint state, this paper adopts different constraint models to simulate the actual bearing constraints, through the analysis and comparison of the natural frequency and vibration mode, obtain more accurate analysis results to avoid the resonance of double screw pump at work. In order to achieve the purpose of optimization design of screw rotor performance
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