Optimum fin size and heat transfer enhancement ratio were obtained. The generated results for a finned tube with a root diameter of 20 mm is that optimum fin density is 435 fins per meter,optimum fin height is 5.1 mm,and optimum fin pitch is 2.3 mm.
(2) the tooth's fixed angle α and β, the height of the tooth pitch h and the distance of the tooth pitch P have influence on the cleaning moment, rotating velocity and rotating stability of the twisted tapes;
These experiments were designed by using orthogonal method in the study,and nine kinds of circular saw blades were trial-manufactured,with different tooth pitch,hook angle and top or face bevel.
The results show the cleaning moment of tooth-like self-rotating plastic twisted tapes increase by 42% ~70% than that of the common smooth self-rotating plastic twisted tapes, and the structure parameters of the tooth pitch, such as and fixed angle, the height of tooth pitch, the distance of tooth pitch will influence the cleaning moment, the self-rotating velocity of twisted tapes and the steady rotating of twisted tapes.
Results Tooth spacing,holding power,the temperature of fingers,modified Rodnan thickness score,urinary protein,IgG were all improved in both groups after 1,3,6,12 months and holding power was improved most significantly.
This paper introduces several cases of the radial runout of tooth ring, and probes into the influencing factors on and regulating methods for the accumulated error of tooth spacing and the error of tooth spacing.
The paper introduces the developing method and key technology of a CAPP system of face-milling cutter with unequal tooth spacing. In the BDCJXCAPP system,the process information is described by XML and saved into the relational database so as to achieve the uniformity and share of information.
By means of finite-clement number numerical analysis and mesh auto-section, magnetic field in range of half tooth spacing of reluctance stepping motor is analysed, and static torque characteristics of the motor in single-phase and two-phase supply are separately calculated. Its result approachs to measured value to meet the needs of engineering design.
This method has been successfully applied to update the EVTM gear pitch tester whose measuring accuracy and anti-jamming capability have been significantly improved.
To overcome the shortage of hard synchronization of the test pieces circumferential speed with the linear movement of measuring probe in the traditional gear pitch relative measurement, this paper introduces a new method based on PC and high-speed data acquisition system.
Following measuring principle and using high precise components, a measuring platform of absolute measuring method for measurement of ultraprecision gear pitch errors was built.
The satellite passes chosen for the detailed analysis and modeling lay approximately along the cusp/cleft band from afternoon till prenoon MLT sectors, thus emphasizing the pitch-angle dispersion role with respect to the dispersion due to convection.
It is assumed that in such a cascade each i-th system (group) of profiles has its own pitch ti (i=1, 2,?, s) and constant phase shift αi of the oscillations between neighboring profiles.
Finally, the optimum configuration of uneven tooth pitch angles for a six-flute reamer, in order to have the highest vibration decay rate during the reaming, was presented.
When the harps are removed, the proportionality between tooth spacing and scraper velocity is lost; the velocity is much increased (up to 3-fold) and the variance of the speed is enhanced 5-fold.
The model specifies the interaction between workpiece and multiple cutter flutes by the convolution of cutting-edge geometry function with a train of impulses having the period equivalent to tooth spacing.
齿距
pitch
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