Reliability Assignment Design Method of Function Mechanism of Mechanical Products
A functional mechanism and distribution design technology, applied in design optimization/simulation, calculation, configuration CAD, etc., can solve problems such as unresolved reliability requirements
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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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