Integration of vibration and lubricating metal particle information for condition monitoring of aircraft engine main bearings
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摘要:
针对单一检测手段难以对航空发动机主轴承进行在线监测以及准确诊断故障的问题,提出一种振动与滑油金属屑末信息融合的航空发动机主轴承状态监控方法。首先选用有效值作为时域特征参数,定义特征能量作为频域特征参数,滑油金属屑末数作为滑油屑末信息。基于模糊推理理论将上述参数进行融合,通过选取隶属度函数、定义模糊推理规则,进行振动信号及滑油金属屑末信息的融合分析诊断轴承故障。开展航空发动机主轴承剥落扩展试验及某型航空发动机整机试车试验,安装振动及滑油屑末检测系统,同步采集轴承剥落全程的振动及滑油屑末信息,并应用所提出方法对所测得数据进行分析。结果表明:轴承运行1 h,计算得到输出轴承状态数值为0.18,处于0~0.35之间,轴承状态良好;运行中期9 h,轴承状态数值为0.5,处于0.35~0.65之间,轴承状态欠佳;轴承运行后期18 h,计算得到输出轴承状态数值为0.82,处于0.65~1之间,轴承故障严重。所提信息融合方法可有效监测轴承运行状态,可为航空发动机主轴承状态监控提供有效手段。
Abstract:To address the challenge of online monitoring and accurate fault diagnosis of the main bearings in aircraft engines using a single detection method, a state monitoring approach based on the fusion of vibration signals and oil debris information was proposed. First, the root mean square value was selected as the time-domain feature parameter, feature energy was defined as the frequency-domain feature parameter, and the number of metal debris particles in the oil was used as the oil debris information. Based on fuzzy inference theory, these parameters were fused by selecting membership functions and defining fuzzy inference rules to perform fusion analysis and fault diagnosis of the bearings using vibration signals and oil debris information. The results indicated that after operating 1 hour, the calculated bearing condition value was 0.18, which fell within the range of 0 to 0.35, signifying that the bearing was in good condition. After medium-term operation of 9 hours, the bearing condition value was 0.5, within the range of 0.35 to 0.65, indicating a suboptimal bearing state. Running towards the end of its operation of 18 hours, the calculated bearing condition value was 0.82, within the range of 0.65 to 1, suggesting severe bearing failure. The proposed information fusion method can effectively monitor the operational status of the bearing and can provide an effective means for the condition monitoring of the main bearing in an aircraft engine.
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表 1 金属屑末单次增长量
Table 1. Single increase of metal particle debris
运行
时间/h剥落尺寸(长×宽)/(mm×mm) 增长量 试验前 试验后 2 8×6 15×12 850~900 4 15×12 23×17 850~900 6 23×17 25×17 750~800 10 25×17 25×20 600~650 14 25×20 31×20 约 1000 18 31×20 70×20 约 4000 表 2 轴承运行全程时域参数变化
Table 2. Time domain parameter change of bearing operation
运行时间/h 有效值 峰值 滑油金属屑末数 1 27.2g 109.3g 450 2 12.9g 52.5g 900 3 22.8g 74.7g 1350 4 45.2g 163.6g 1800 5 24.9g 111.8g 2200 6 33.9g 137.6g 2600 7 25.7g 98.4g 2760 8 35.3g 123.6g 2925 9 31.8g 113.7g 3085 10 26.6g 104.6g 3250 11 32.6g 126.2g 3500 12 33.6g 146.8g 3750 13 40.9g 141.6g 4000 14 52.9g 165.3g 4250 15 54.1g 219.5g 5250 16 88.9g 389.6g 6250 17 112.9g 417.1g 7250 18 106.9g 405.3g 8250 表 3 轴承运行1 h小波包节点分量参数
Table 3. Parameter of node component of wavelet packet in bearing operation for 1 h
节点 偏度 峭度 排列熵 1 1.00 0.49 0.53 2 0.18 0.48 0.69 3 0.01 0.94 0.85 4 0.79 0.79 0.87 5 0.00 0.63 0.71 6 0.02 0.69 0.89 7 0.02 1.00 0.91 8 0.10 0.69 1.00 表 4 轴承运行全程特征能量变化趋势
Table 4. Characteristic energy variation trend of bearing operation
运行时间/h 特征能量 滑油金属屑末数 1 85.5 450 2 120.3 900 3 138.0 1350 4 173.7 1800 5 235.0 2200 6 205.0 2600 7 219.8 2760 8 302.3 2925 9 291.0 3085 10 171.1 3250 11 200.7 3500 12 232.6 3750 13 83.6 4000 14 140.2 4250 15 176.3 5250 16 83.1 6250 17 87.9 7250 18 170.6 8250 表 5 轴承运行全程损伤程度判别
Table 5. Judging the damage degree of the whole bearing operation
运行
时间/h有效值 特征
能量滑油金属
屑末数轴承
状态1 27.2g 85.5 450 良好 2 12.9g 120.3 900 良好 3 22.8g 138.0 1350 欠佳 4 45.2g 173.7 1800 欠佳 5 24.9g 235.0 2200 欠佳 6 33.9g 205.0 2600 欠佳 7 25.7g 219.8 2760 欠佳 8 35.3g 302.3 2925 欠佳 9 31.8g 291.0 3085 欠佳 10 26.6g 171.1 3250 欠佳 11 32.6g 200.7 3500 欠佳 12 33.6g 232.6 3750 欠佳 13 40.9g 83.6 4000 严重 14 52.9g 140.2 4250 严重 15 54.1g 176.3 5250 严重 16 88.9g 83.1 6250 严重 17 112.9g 87.9 7250 严重 18 106.9g 170.6 8250 严重 -
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