A Reliability Allocation Method for Mechanism's Motion Accuracy Considering Wear
A technology of mechanism movement and distribution method, applied in instruments, geometric CAD, calculation, etc., can solve the problems of running error and take into account at the same time, and achieve the effect of ensuring the reliability of the mechanism and meeting the requirements of reliability indicators
Active Publication Date: 2019-08-09
BEIHANG UNIV
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Problems solved by technology
[0005] So far, although there are many methods of error allocation, there is no research that takes into account both the original error and the operating error and meets the specified reliability when allocating the error of the mechanism.
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Embodiment
[0122] Based on the above theory Figure 4 The slider crank mechanism is designed for reliability distribution or precision.
[0123] Such as Figure 4 As shown, the crank-slider mechanism includes a crank OA, a connecting rod AB, and a slider, point O is the same height as point B on the slider, the length r of the crank OA is 20cm, and the length g of the connecting rod AB is g=40cm , α is the angle through which the crank OA rotates. If the rotation angle α=90° after working for 20kh, the required mechanism accuracy reliability R 0 =0.942, allowable output displacement error eigenvalue (μ 0 ,σ 0 )=(0.95,0.01)(cm), taking the stable stage of wear as an example, assuming that the wear rate characteristic value of the selected component material at point O and point A (μ v ,σ v )=(0.06,0.0033)(cm / kh), the gap at B can be ignored. Try to determine the eigenvalues of the gaps at points O and A and the dimensional tolerances of the components.
[0124] Step 1. Carry out...
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The invention discloses a mechanism motion accuracy reliability allocation method considering abrasion, belonging to the technical field of mechanism accuracy design. The method comprises the steps of analyzing the mechanism motion accuracy reliability, then determining design variable and material selection, establishing a cost function of the design variable, establishing an optimization model taking the reliability as constraint and minimum cost as a target, and solving; and finally, according to a processing level tolerance table, selecting the processing level through step four, determining the dimensional tolerance of a member, and verifying whether the degree of reliability of a mechanism is met or not. According to the method, not only can the reliability of the mechanism be ensured, but also a reasonable processing level can be selected under the condition of ensuring the minimum cost; design of allocation from top to bottom and iterated spiral escalation from bottom to top can be realized, the mutual fusion of reliability design and reliability prediction can be realized, and meanwhile, the professional design and reliability are combined, so that the final result can meet the requirement on the degree of reliability.
Description
technical field [0001] The invention belongs to the technical field of mechanism precision design, and in particular relates to a reliability allocation method of mechanism movement accuracy considering wear and tear. The method considers that the reliability of the mechanism is related to the error, and converts the reliability distribution into the error distribution, which is used to determine the reliability of the mechanism. Dimensional tolerances and hinge clearances of individual components. Background technique [0002] The motion mechanism is a typical motion device widely used in a class of engineering, which requires the mechanism to have high precision and reliability. Motion accuracy reliability is an important index to measure the quality of the mechanism, so it is necessary to design and allocate the reliability of the mechanism. The traditional reliability allocation method cannot allocate the reliability index to the component level to achieve the purpose o...
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IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 李晓阳陈星康锐
Owner BEIHANG UNIV