共查询到20条相似文献,搜索用时 992 毫秒
1.
基于能量损耗的齿轮磨损与振动相关性建模 总被引:3,自引:0,他引:3
依据齿轮的磨损与振动均消耗系统能量的特征,提出了采用能量损耗来建立齿轮副磨损与振动的相关性模型和计算方法。齿轮副的磨损耗能采用光谱分析法元素的质量分数去表征,振动耗能采用时域信号振动速度的均方根值表示。通过对这两个不同量纲机械测量参数的对数化处理,并结合试验数据分析表明,齿轮的磨损与振动高度相关,该研究为齿轮箱故障诊断技术采用能量损耗变化去判别故障模式提供了另一途径。 相似文献
2.
基于高阶累积量的齿轮箱故障诊断研究 总被引:10,自引:1,他引:10
当齿轮箱发生故障时,实际测得的齿轮振动信号一般是非平稳和非高斯分布的信号,不同故障状态下的振动信号具有不同的高斯性和对称性,通常包含较强的噪声。高阶累积量具有对加性高斯噪声和对称非高斯噪声不敏感的特性,可以应用在齿轮箱的故障诊断中。短时分析方法可以在低信噪比情况下提取周期性冲击故障信号特征。在对振动信号进行短时分析的基础上,计算原始信号及其短时能量函数的高阶累积量。从高阶累积量提取的特征可有效地将正常状态、中度磨损状态、严重磨损状态和断齿状态的齿轮振动信号分离开来,这表明高阶累积量可定量地描述振动信号偏离正态分布的程度,采用样本分割后,还可以定量描述齿轮的磨损程度。 相似文献
3.
4.
5.
基于非平稳时间序列双标度指数特征的齿轮箱故障诊断 总被引:8,自引:0,他引:8
齿轮箱振动信号是含噪的多分量非平稳信号,故障模式相近的复杂齿轮箱振动信号的分类是齿轮箱故障诊断的难点。采用去趋势波动分析(Detrended fluctuation analysis,DFA)方法分析齿轮箱振动信号的标度行为,随着时间尺度的增大,标度指数会突然发生改变,形成双标度指数特征,由双标度指数构成的二维矢量具有明确的物理意义,可以作为表征时间序列内部动力学机制的特征参数。提出一种基于非平稳时间序列双标度指数特征的齿轮箱故障诊断方法,对正常状态和含有轻度磨损、中度磨损和断齿故障的齿轮箱故障诊断的结果表明,提出的方法成功地解决了故障模式相近的复杂齿轮箱振动信号的分类问题,很好地克服了傅里叶变换、小波变换和基于单标度指数的方法存在的缺陷,为齿轮箱的故障诊断提供了一种新的方法。 相似文献
6.
基于能量耗损的发动机故障诊断方法研究 总被引:2,自引:1,他引:1
针对发动机在发生故障时都伴随能量耗损变化,提出一种基于能量耗损的发动机故障诊断方法.基于发动机系统输入输出的能量分析,建立发动机系统的能量监测模型;根据输入的流量与输出的功率,建立发动机系统的能量耗损模型;根据能量耗损机制,分析发动机运动副的摩擦与振动能量耗损诊断方法,建立摩擦和振动信息与能量耗损模型.以发动机活塞磨损故障为例,从振动耗能的角度,通过对测振信号的小波分析,得到能量耗损变化,诊断出活塞的磨损状态,验证了基于能量耗损的发动机故障诊断方法是可行的. 相似文献
7.
8.
9.
10.
11.
基于最小二乘支持向量机的磨损预测 总被引:1,自引:0,他引:1
针对机器设备磨损产生的因素多,而且磨损量的多少与产生的因素具有高度非线性,磨损难以预测的问题。同时考虑到监测得到的数据为小样本事件也是磨损难以预测的原因,在齿轮箱实验数据的基础上,利用最小二乘支持向量机,给出预测步骤,提出一种以载荷、温度、振动信号特征、速度和时间为输入量,机器设备的磨损量为输出量的预测方法。用齿轮箱的实验数据验证了所提出的方法的有效性。 相似文献
12.
13.
14.
《Wear》2007,262(1-2):198-203
This work examines how wear rates are affected by frequency of vibration in conjunction with relative humidity. Variation of wear rate with the variation of frequency of vibration and relative humidity is investigated experimentally on a mild steel disc using specially designed pin-on-disc apparatus having facility of vibrating the disc at different frequency of vibration and amplitude. During the experiment, the effect of normal load, speed and relative humidity on wear rate were also investigated. The surface conditions of the mild steel base plate were ‘as-turned’ and ‘as-ground’. Studies have shown that wear rate under no vibration condition is higher than that under vibration condition. The values of wear rate decrease with the increase of frequency of vibration. Similarly, the wear rate decreases with the increase of relative humidity within the observed range. In this study, it is also observed that the rate of reduction of wear rate has a particular relationship on the frequency of vibration and the relative humidity. The experimental results are compared with those available in the literature and simple physical explanations are provided. 相似文献
15.
To explain the fact that the wear rate of a carbon steel subjected to ultrasonic vibration decreases with an increase in the amplitude of vibration, a simple equation for the wear rate was derived using the theories of adhesive wear and analytical results of vibration. Analytical predictions were in good agreement with experimental results. One of the main factors affecting the wear behaviour under vibration is the contact time between specimens during 1 cycle of vibration. The amount of oxygen adsorbed on rubbing surfaces with repeated dynamic contact loading also affects the wear rate. The activation energy of oxygen adsorption with vibration is considered to be lower than that found in the process of ordinary wear without vibration. The variation in hardness of worn surfaces due to repeated friction passes has little effect on the wear rate with vibration. 相似文献
16.
17.
《Wear》2002,252(5-6):375-383
The wear of materials in sliding contacts is considered as resulting from an energy dissipation due to friction between the contacting first bodies. Up to now, no standard procedure in tribology is available to relate that dissipated energy with wear losses for different sliding wear tests and conditions. In this paper, a procedure is proposed to correlate the volumetric wear loss of one first body with the dissipated energy for unidirectional and bidirectional ball-on-flat tests. The model can be useful to predict the service lifetime of components from a limited number of laboratory tests. The validity and limitation of the wear loss versus dissipated energy model is illustrated for hard coatings like TiN and (Ti, Al)N, and multilayered (Ti, Al)N/TiN coatings. The effect of the applied normal load and the relative humidity (RH) of the ambient air on the wear rate for these different coatings are shown as well. A mild oxidational wear model is used to describe the material loss on these coatings in sliding contacts. 相似文献
18.
为了提高机械加工过程中刀具磨损在线监测的准确性,提出了一种基于长短时记忆卷积神经网络(LSTM-CNN)的刀具磨损在线监测模型。在该监测模型中,通过振动、力、声发射传感器对刀具切削过程中的振动、力和声发射信号进行采集,采集的数据其本质为时间序列数据。考虑采集数据的序列和多维度特性,采用LSTM-CNN网络对采集的数据进行序列和多维度特征提取,利用线性回归实现特征到刀具磨损值的映射。通过实验验证了该模型的有效性和可行性,模型的精度较其他几种方法有了较大的提高。 相似文献
19.
为实现截齿截割过程中磨损程度的实时精准在线监测,提出了一种基于BP神经网络的截齿磨损程度多特征信号融合的检测方法。通过提取截割过程中不同磨损程度截齿的三向振动信号、红外温度信号和电流信号,建立了不同磨损程度截齿的多特征信号样本数据库,采用多特征信号样本对BP神经网络进行学习和训练,建立截齿磨损程度的识别模型,实现截齿磨损程度在线监测与精确识别。实验结果表明:基于BP神经网络的截齿磨损程度监测系统,网络判别结果和测试样本的实际磨损程度类别相符,该BP神经网络系统能够对截齿磨损程度类型进行准确的监测和识别。 相似文献
20.
柴油机缸套磨损故障的机体振动监测研究 总被引:3,自引:0,他引:3
研究了柴油机缸套磨损故障的机体振动监测,包括缸套破坏性磨损故障时的机体振动。首先分析了活塞对气缸套的冲击,建立了活塞撞击气缸套侧推力的数学模型,探讨侧推力的大小及作用时间。分析表明,柴油机活塞撞击是机体表面振动的主要激励源。通过模拟试验得知,缸套磨损状态有4种,当缸套间隙正常或中等磨损时,机体振动的增长速度较慢;严重磨损时,振动特征参数值明显增大;如果缸套处于破坏性磨损程度时还继续工作,机体振动则呈指数式增长。这说明机体表面振动特征值的改变可以反映缸套间隙的变化,因此,基于柴油机机体振动对缸套的磨损进行监测是可行的、有效的。 相似文献