考虑参数权重的数控机床电主轴加速试验优化设计

doi:10.13229/j.cnki.jdxbgxb20211148

Abstract

Abstract:

In order to solve the problem of low estimation accuracy of some model parameters in the multi stress step stress accelerated degradation test of motorized spindle， a new optimal design method of multi stress step stress accelerated degradation test scheme is proposed in this paper. The sensitivity analysis method and the comprehensive importance of stress are used to determine the weight of each parameter of the acceleration model in the accelerated degradation test， A new optimal design criterion is proposed based on $D s$ -optimality and parameter weight； the optimization process is given combined with genetic algorithm. Finally， taking the motorized spindle made in China as an example， the accelerated degradation test scheme is optimized， and the results are compared with the existing criteria， verify the effectiveness of the method.

Key words: numerical control machine, motorized spindle, reliability, accelerated degradation test, optimal design

CLC Number:

TH17

Hong-xun ZHAO,Zhao-jun YANG,Chuan-hai CHEN,Hai-long TIAN,Li-ping WANG. Optimal design of acceleration test of motorized spindle of numerical control Machine Tool considering parameter weight[J].Journal of Jilin University(Engineering and Technology Edition), 2022, 52(2): 409-416.

Figures/Tables 7

Fig.1

Fig.2

Fig.3

Table 1

Expected test cost and accelerated degradation test cost"

项目	费用/万元
试验预期费用（ $C 1$ ）	25
$C d$	2.5
$C 0$	0.005/ $h$

Table 1

Table 2

Optimization results"

优化变量	优化后具体数值
$n$	5
$S 1$	［450 500 650 800］
$S 2$	［6000 6500 8500 10000］
$m$	［64 62 62 62］
$M m$	5.2388× $1013$

Table 2

Table 3

Optimization results of Ds-optimality"

优化变量	优化后具体数值
$n$	5
$S 1$	［550 600 700 750］
$S 2$	［6500 7000 7500 8000］
$m$	［66 62 61 61］

Table 3

Table 4

Comparison of results"

模型参数	权重准则	$D s$ 准则	变化/%
$γ 0$	$5.7355 × 1013$	$6.0374 × 1013$	-5.1
$γ 1$	$2.3384 × 1013$	$1.9831 × 1013$	+17.9
$γ 2$	$2.0752 × 1013$	$1.4495 × 1013$	+43.2

Table 4

References 16

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Optimal design of acceleration test of motorized spindle of numerical control Machine Tool considering parameter weight

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