用于灵敏轴承故障诊断的动态摩擦力矩采集系统
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摘要
灵敏轴承主要用于航天、航空、舰船以及精确制导武器等的高精度导航系统领域,其摩擦力矩的大小和波动性直接影响导航系统的定向和定位精度以及轴承的寿命,甚至威胁主机的安全。它的摩擦力矩及其波动性涉及到轴承结构参数、材料性能、工况条件以及润滑剂等多因素,是个十分复杂的问题,摩擦力矩及其波动性越小,轴承工作的稳定性和精度也就越高。
     本文首先从课题的研究背景与目的出发,根据轴承动态摩擦力矩测量仪的工作原理明确了系统的总体设计思想,为提高系统采集的精度,制定了相关的硬件方面的改进方案,配置了完成系统所需的硬件,还采取了相关的抗电磁干扰措施;然后详细给出了摩擦力矩采集系统的软件实现。最后,对实验所得数据进行了故障因素的统计分析,建立了故障诊断模型。
     基于虚拟仪器技术的轴承动态摩擦力矩采集分析系统实现了轴承摩擦力矩信号的高速大容量的数据采集,保证了数据分析精度,实现了采样数据的实时存储、显示、并可进行时域、频域分析,为构成基于摩擦力矩的航天轴承故障诊断系统做了大量基础性工作。
     在理论上,本文利用统计学在故障诊断方面的应用,建立的动态摩擦力矩诊断模型其诊断准确率达到70%,为灵敏轴承的动态摩擦力矩诊断提出了一种理论研究方向;在应用上,经改进的灵敏轴承动态摩擦力矩测量系统精度上提高了约1.4%,能够更准确的反映出力矩的实际波形,可以方便灵敏轴承生产厂家和用户对产品的动态摩擦力矩进行检测及分析,为生产和使用具有更高可靠度的精密轴承提供了的理论支持与改进途径。
Sensitive bearings are mainly used in the domain of high accuracy navigation such as aerospace, aviation, ships and precision guided munitions as well. The values and volatility of friction moment related to sensitive bearings directly affect the orientation and precision of the navigation saystem as well as longevity of the bearings, even threatening main engine’s security. There are multi-factors affecting friction moment and volatility such as the bearing structure parameter, the material performance, the operating condition, and lubricant, etc, which is a complex problem. The less the friction and volatility is, the higher the stability and precision will be.
     This dissertation starts from the introduction to the background and the goal of the research. Based on the working principles of the bearing dynamic friction moment measuring instruments, systematic design thought is specifically formulated. To enhance the precision of system gathering, the improvement program related to hardware is worked out: the hardware which the system needed is equipped, the related anti-electromagnetic interference measure has also been taken. Then the detailed software realization of friction moment gathering system is put forward. Finally, statistical analysis of the breakdown factors, of which the data are obtained from test, is carried out. And the failure diagnosis model is established.
     The bearing dynamic friction moment gathering analysis system based on the virtual instrument technology has realized data acquisition of bearing friction moment signals with high speed and large capacity, guaranteing the precision of data analysis, realizing real-time memory and demonstration of the sampled data, carrying on time domain analysis and frequency range analysis. Much work had been done to make up the bearing diagnose system based on the friction moment.
     In theory, through application of statistics to the failure diagnosis, the establishment dynamic friction moment diagnostic model has achieved diagnosis accuracy rate of 70%, then proposing one kind of theoretical research direction for the sensitive bearing's dynamic friction moment diagnosis. In application, the improved sensitive bearing dynamic friction moment measurement system increases its precision by approximately 1.4%, more accurately reflecting actual profile of moment. Therefore, this research facilitates the manufacturers and the users of sensitive bearing in the examination and the analysis of the product-related dynamic friction moment, and also provides theoretical support for and the improvement way of producing and employing precision bearings with higher reliability.
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