Method for automatic checking of components with any curvilinear profile

Conclusions Above we have dealt with a method for testing (plotting) profiles described by any curves. This method is based on the combination of a kinematic method for reproducing cycloidal curves by means of the simplest three-bar motion and programming which sets a definite variable ratio of the angular velocities of two links of this mechanism, thus providing the reproduction of any required curve.     

曲线齿线圆柱齿轮啮合数学模型

参照圆弧齿线圆柱齿轮齿面方程的推导方法以及齿面组成特点,介绍了一类曲线齿线圆柱齿轮的齿面组成特点.采用齿轮啮合原理中的单参数曲面包络方法,运用坐标变换推导了曲线齿线圆柱齿轮的数学方程和共轭齿面方程的一般形式.以圆弧齿线圆柱齿轮的齿面方程推导为例,推导了圆弧齿线圆柱齿轮的空间啮合数学模型,并采用UG建模软件建立了圆弧齿线圆柱齿轮的3D模型,验证了该方法的正确性.研究结果为进一步开展新型齿线的设计、新型曲线齿线圆柱齿轮传动研究提供了理论基础.     

Methods for checking thermoelectric thermometers

Translated from Izmeritel'naya Tekhnika, No. 12, pp. 34, 39–40, December, 1992.     

Wide-range pneumatic instrument for automatic checking of dimensions

Conclusions The testing of the system showed that the linear measurement range for 2 mm nozzles amounted to 440 with a maximum gap of 600 (Fig. 5).Thus, the measuring range completely covers the allowance for grinding, and instruments made according to this design can be used for non-contact automatic measurement during machining.     

Dielectronic recombination cross sections for fusion plasmas

The almost simultaneous appearance of calculated and measured dielectronic recombination cross sections for singly and few-times charged target ions has produced an interesting situation. The large disparity between theory and experiment has provoked speculation about a possible “electric field effect”. The implications of this idea are examined, in the context of distorted-wave theory, and using the isolated-resonance-approximation.     

Preliminary selection of instruments for automatic control and checking

Summary Having plotted for various instruments the curves of k_i=f₁() and k_r=f₂() for several values of (from the data of industrial or laboratory tests), it is possible to find k_i and k_r for any other values of. Similarly for pneumatic instruments we have k_i=f₁(P_s) and k_r=f₂(P_s). This facilitates the preliminary choice of instruments without the necessity of taking many response curves. The ratio _i/T_i can also be used for a mathematical analysis of the behavior of automatic control systems [13].     

Accurate coupling coefficients for fiber couplers with weakly fused cross sections

For fused tapered fiber couplers with weakly fused cross sections, power coupling takes place between two touching tapered cladding cylinders embedded in the air, and the cylinders then become a strongly guiding structure. We provide accurate polarization-dependent coupling coefficients for such a structure, on the basis of a rigorous vectorial numerical calculation. Our results for the corresponding weakly guiding structure are compared with previous vector perturbation methods base on scalar fields. It is found that the scalar theories are not applicable to those cases with large normalized frequencies or with small fiber separations when the polarization-splitting effect is concerned.     

Fiber-taper-coupled zeolite cylindrical microcavity with hexagonal cross section

Whispering-gallery modes (WGMs) in a zeolite cylinder have been effectively coupled with a low-loss fiber taper. The fiber transmission spectrum directly shows the WGM distribution, which agrees well with the theoretical prediction based on geometric optics. Due to other scattering and absorbing mechanisms, the measured quality factors of the WGMs are limited to approximately 800. This result shows that the fiber taper provides a powerful tool for coupling WGMs of a zeolite cylinder, and this taper-coupled zeolite can be a potential microcavity system for the cavity quantum electrodynamics and the microlaser.     

Shear deformability of thin-walled beams with arbitrary cross sections

Formulas for the computation of the shear deformability of thin-walled prismatic beams can be found in the technical literature only in the special case of symmetric cross sections. In order to fill this gap a formulation of the flexural behaviour of thin-walled beams taking into account transverse shear deflections is developed in the present paper. On this basis, the general expression of the shear centre location and the shear deformability tensor for open and closed sections of arbitrary shape are given and their properties discussed. In the case of polygonal, circular and arc-shaped cross sections explicit formulas, which can be suitably implemented for automatic computations, are provided. For the sake of completeness, the expression of the stiffness tensor for prismatic beams, previously obtained by the first two authors in a co-ordinate-free version, is reported. Finally, a numerical example is carried out and comparisons with the results given by Cowper¹ for symmetric cross sections are presented.