摘要：Rotor clearance is necessary for the safe operation of twin-screw compressors,and it has a major impact on the performance of twin-screw *** purpose of this study was to obtain a rotor tooth profile with reasonable meshing clearance on the rotor end surface,so that the clearance on the rotor contact line would be uniform and the rotor could be smoothly *** ideal conditions,the rotor of a screw compressor should have no clearance or ***,owing to assembly errors,thermal compression,stress deformation,and other factors,a rotor without backlash modification will inevitably produce interference during operation.A new design method based on the Alpha shape solution was proposed to achieve an efficient and high-precision design of the clearance of the twin-screw rotor *** method avoids the complex analytical calculations in the traditional envelope *** best approximation of the points on the rotor conjugate motion sweeping surface in the points is illuminated using a specific *** sweeping surface of the screw rotor single-tooth profile is roughly scanned to capture the base point set of the sweeping surface boundary *** chord length and tilt angle of each interval are calculated using the value of the base point set to adjust the position,phase,and magnification of each interval sweeping ***,the data point set is converted to the same coordinate system to generate the conjugated rotor *** example was used to verify the feasibility and adaptability of this *** on the equidistant profile method,the clearance between male and female rotors of a screw compressor was obtained under actual operation ***,this study provides a basis for the meshing clearance design in the machining of twin-screw compressor rotors.

摘要：The class of system considered is a single degree of freedom undamped vibrating system with a clearance in which the dynamical behavior is described by a state-space representation in real time. The direct identification technique for the estimate of a clearance and other parameters in the system is presented in terms of least squares method and step-by-step iteration approach. For numerical simulation purpose, the simulated data are achieved by corrupting the modeled responses. The mathematical algorithm, which is put forward, has proven to be effective through a practical numerical example.

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