Reliability Assignment Design Method of Function Mechanism of Mechanical Products
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A functional mechanism and distribution design technology, applied in design optimization/simulation, calculation, configuration CAD, etc., can solve problems such as unresolved reliability requirements
Active Publication Date: 2019-06-21
NORTHWESTERN POLYTECHNICAL UNIV
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[0009] The purpose of the present invention is to solve the problem that the tolerance distribution method used in the design of the functional mechanism of the existing mechanical product can only guarantee its performance index, but cannot solve the problem of its reliability requirements, and provides a reliability distribution design method of the functional mechanism of the mechanical product
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specific Embodiment approach 1
[0026] Specific implementation mode one: the following combination Figure 1 to Figure 4 Illustrate this embodiment, the reliability distribution design method of mechanical product functional mechanism described in this embodiment, it comprises the following steps:
[0027] Step 1: According to the reliability requirements of the functional mechanism, determine the functional characteristic quantity and the design variables that need to be designed for reliability allocation;
[0028] Step 2: Establish the limit state function according to the functional characteristic quantity and failure criterion of the functional mechanism;
[0029] Step 3: Set the design variable distribution parameters, and obtain the mean and standard deviation expressions of the limit state function;
[0030] Step 4: Obtain the target value of the reliability index of the functional mechanism according to the reliability requirements of the functional mechanism;
[0031] Step 5: Obtain the target va...
specific Embodiment
[0068] Take the eccentric slider crank mechanism as an example, such as figure 2 shown. Take the crank as the active part, and the input motion is the rotation angle α; the slider is the driven part, and the output displacement is Y. Suppose the crank CA=r, the connecting rod AB=l, the eccentricity is e, when e=0, it is the centering crank slider mechanism.
[0069] In order to simplify the problem, we only take the allocation design of the reliability index of the movement displacement function of the mechanism as an example. The movement speed and acceleration of the mechanism can be obtained by calculating the first-order and second-order partial derivatives of the displacement equation. According to the geometric relationship and kinematics knowledge of the mechanism in the figure, the displacement equation of the slider is shown as follows.
[0070]
[0071] Assume that the reliability index requirement of this crank-slider mechanism is: When the input rotation angl...
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Abstract
The invention discloses a reliability allocation design method of the function mechanism of a mechanical product, and belongs to the technical field of the reliability design of mechanical products. The reliability allocation design method aims to solve the problem that a tolerance allocation method adopted by the function mechanism design of an existing mechanism product only can guarantee the performance index of the mechanical product but can not meet the reliability requirement of the mechanical product. The method comprises the following steps of: determining a functional characteristic quantity and a design variable; combining with a failure criterion to establishing a limiting condition function; obtaining the mean value and the standard deviation expression of the limiting condition function; obtaining the target value of a reliability degree index of the function mechanism; obtaining the target value of the standard deviation of the limiting condition function; obtaining the standard deviation upper limit value of each design variable; obtaining the reliability sensitivity of the design variable, and calculating a relative sensitivity factor; according to the ratio of the relative sensitivity factor, regulating the standard deviation of the design variable, and determining the regulated standard deviation of the design variable; and the taking the regulated standard deviation of the design variable as a design scheme value of the function mechanism. The reliability allocation design method is used for the allocation design of the function mechanism.
Description
technical field [0001] The invention relates to a reliability distribution design method of a mechanical product, in particular to a reliability distribution design method of a mechanical product functional mechanism. Background technique [0002] Reliability allocation Reliability allocation refers to the allocation of the specified overall system reliability indicators to each component unit such as subsystems, components, components or parts in accordance with certain principles in the engineering design stage of the product, and to clarify the indicator requirements of each unit, so that the system Overall reliability indicators are guaranteed. [0003] The purpose of reliability allocation is to enable designers at all levels to clarify the requirements of product reliability design and implement them in the design. Quantitatively allocate the reliability index of the product to the specified level, and through the quantitative allocation, the overall and partial relia...
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