Blade modeling method for hydraulic torque converter

Abstract

The invention discloses a hydraulic torque converter blade modeling method, which is based on a non-uniform rational B-spline curve back calculation principle, and designs unit blade bone lines and unit blade thickness distribution by utilizing a section of three-time non-uniform rational B-spline open curve with five data points and a section of three-time non-uniform rational B-spline closed curve. The method comprises the following steps: firstly, extracting a profile value point of a known blade profile, calculating a corresponding control point matrix through an inverse calculation matrix, and then establishing an analytic relationship between non-uniform rational B-spline curve control points and key geometric parameters of the blade, so that a designer can directly design the blade through the geometric parameters; according to the method, full parameterization design of a blade design full curve is achieved, the newly-designed non-uniform B spline curve has strict curvature continuity, and the requirements for continuity and smoothness of streamline blade design in engineering are completely met. The design of the blade profile has the advantages of good flexibility, local adjustability and high adaptability, and design parameters are simple and visual.

Description

technical field [0001] The invention relates to the technical field of hydraulic torque converters, in particular to a hydraulic torque converter vane modeling method based on the inverse calculation principle of non-uniform rational B-spline profiles. Background technique [0002] The engineering environment faced by modern construction machinery is becoming more and more complex, and the demand for working in extreme environments and extreme working conditions is becoming stronger and stronger, forcing the engine power to continue to increase. As the core component of the hydraulic transmission system, the hydraulic torque converter needs to maintain a dynamic match with the engine at all times, which requires the hydraulic torque converter to break through the key technical bottlenecks in the design and manufacture of high power, high energy capacity, and high speed. The blade is the most direct carrier of the torque of the impeller of the torque converter, and the design...

AI Technical Summary

Problems solved by technology

The coarse adjustment and fine adjustment capabilities of the blade bone line are limited, and it is not suitable for constructing a hydraulic torque converter with high power, high energy capacity, and high curvature cascade system

In addition, the conformal transformation principle itself has accumulated errors, which lead to the shortcomings of unclosed and distorted 2D-3D curves, resulting in irreversible design errors in blade curve design

[0006] The circulation distribution method has a good rough adjustment ability, but it cannot accurately describe the specific direction of the bone line from the entrance to the exit of the blade.

It calculates a series of discrete points based on the offset to determine the three-dimensional coordinates of the blade, and realizes three-dimensional blade modeling. The analytical description of the blade bone line and the calculation of the curvature cannot be well solved.

In addition, since it is impossible to make an accurate analytical description of the slope or curvature distribution from the inlet to the outlet of the blade, it is impossible to achieve accurate thickening in its normal direction, and to achieve accurate calculation of the pressure surface and suction surface

[0007] Although the traditional blade modeling method is convenient and easy to understand, there are many defects in blade design accuracy, modeling flexibility and adaptability, which can no longer meet the requirements of engineering for flexible blade modeling, strong adaptability, and easy parameterization. Features such as simplified expression and simple structure

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