...T. H. Choi; M. S. Kim; G. S. Lee; S. Y. Jung; J. H. Bae; C. Kim In the case of internal gear pumps, the eccentricity of the outer rotor, which resembles a circular lobe, must be limited to a certain value in order to avoid the formation of cusps and loops; furthermore, the tip width of the inner...

...Jian Xu; Quanke Feng; Weifeng Wu This paper presents a new edge blunting method of the three screw pump rotor with an elliptic arc and equations of the rotor profile after edge blunting. Through comparisons of different geometrical parameters of the pump, i.e., flow area, contact line length per...

... , p. 031010; Dikmen, E., van der Hoogt, P., de Boer, A., and Aarts, R., 2010, “Influence of Multiphysical Effects on the Dynamics of High Speed Minirotors—Part II: Results,” J. Vibr. Acoust., 132 , p. 031011) for the analysis of small scale rotors are described briefly for background information...

... provide a fighter aircraft with a variable engine inlet capability. The reconfigurable rotor blade program demonstrated the ability of highly robust, controlled 55-Nitinol tube actuators to twist a rotor blade in a spin stand test to optimize rotor aerodynamic characteristics. The variable geometry...

... polynomial ( 15 ) as follows is used here to create the rotor profiles: 20 e 1 ( θ 1 ) = l ( a 4 θ 1 4 + a 3 θ 1 3 + a 2 θ 1 2 + a 1 θ 1 + a 0 ) ,     0 ≤ θ 1 ≤ θ 1 s where a 4 = 1 4 θ 1 s 3 l...

... components leading to suboptimal solutions. The authors propose an approach based on the integrated philosophy for designing and optimizing gas bearing supported rotors. Based on the choice for herringbone grooved journal and spiral groove thrust bearings, the modeling procedure for predicting...

... stiffness. 02 04 2009 05 12 2009 01 03 2010 01 03 2010 electric motors machine tool spindles matrix algebra rolling bearings rotors shafts vibrations motorized spindle rotor dynamic transfer matrix method rolling bearing analysis theory The spindle system...

..., characterized by more complex rotor profiles compared with the classical epitrochoidal pumps. Suitable parameters are pointed out to completely define the geometry of the machine. In the second part of the study, proper indices are set and evaluated as functions of the design parameters, in order to evaluate...

... on the rotor profile. Numerical examples show that this method can successfully estimate and forecast the rotor sealing and the Hertz stress variation. For confirmation, these results are proved by theoretical stress calculations and software simulations. This paper also presents the results of sealing...

... rotor example is used to demonstrate the effectiveness of the proposed robust design method. From Eq. 6 , the variation Δ λ i in the eigenvalue with respect to parameter variations can be expressed as 7 Δ λ = J X with Δ λ i = λ i ( d 0 + Δ d 0...

...Weifeng Wu; Quanke Feng; Xiaoling Yu Cylindrical milling of a screw rotor groove in a single screw compressor has higher machining efficiency than turning. However, the screw groove bottom produced by the flat end of the milling cutter fails to mesh hermetically with the flat tooth tip due...

... assignability. However, when dealing with nonarc-based generating curves, the current methods do not provide switch angle assignability. The switch angle is an important parameter in gerotor kinematics; it determines the angular conjugating range on the generating curve and affects the rotor profile...

...Jia Yan; Daniel C. H. Yang; Shih-Hsi Tong A method for the design of general analytical noncircular multilobe internal pitch curves is presented. The method is based on a reshaping algorithm. A selected monotonic function can be assigned as the initial profile for the outer rotor of the designed...

...Ibrahim A. Sultan A circolimaçon positive displacement machine is driven by a limaçon mechanism, but the profiles of its rotor and housing are circular arcs. As such, its design models are different from those of the limaçon-to-limaçon machines, whose profiles are cut to the limaçon equations...

...Yu-Ren Wu; Zhang-Hua Fong This paper proposes a method for designing the rotor profiles of twin-screw compressors using a rack defined in the normal plane. All tooth profile segments are explicitly defined as tangent continuous in the normal section to generate a pair of conjugated rotors...

...Chiu-Fan Hsieh; Yii-Wen Hwang This paper proposes a gerotor profile design based on the theory of gearing. Presented first is the curve of the outer rotor, whose conjugate profile is the inner rotor. Next, the analysis assesses the feasibility of three different design curves: an epitrochoid curve...

...Chiu-Fan Hsieh; Yii-Wen Hwang Vacuum pump plays an important role in the vacuum system. In this paper, a new method is proposed to design the Roots rotor that was the trochoidal curve with variable trochoid ratio. The fifth-order polynomial and cubic spline functions are used to generate smoothly...

... engine. The main components of the pump are the two rotors. Usually, the outer one is characterized by lobes with a circular shape, while the inner rotor profile is determined as a conjugate to the other. In this study, the design optimization has been carried out to determine the design parameters...

...Yii-Wen Hwang; Chiu-Fan Hsieh This paper uses the theory of gearing to derive the mathematical model of an internal cycloidal gear with tooth difference. Whereas the outer rotor profile is based on a curve equidistant to a hypotrochoidal (or extended hypocycloid) curve, the inner rotor design...

... forces, and the reduction of actuator torque with rotor velocity described by the speed-torque curve , at a particular configuration of a manipulator. The focus here is on nonredundant manipulators with as many actuators as degrees-of-freedom. Analysis of the velocity forces is accomplished using...