滚动轴承平均故障前时间计算方法研究

滚动轴承的平均故障前时间(MTTF)和平均失效率是旋转类机械设备可靠性预计和分析的重要基础数据，传统源于统计样本信息的滚动轴承MTTF和失效率数据可信度不高，难以约束滚动轴承的可靠性定量设计。为得到可信度更高的滚动轴承MTTF，利用滚动轴承疲劳寿命计算方法，基于滚动轴承寿命与可靠度的关系研究，推导了威布尔分布的MTTF和平均失效率计算公式，提出一种滚动轴承MTTF和平均失效率的计算方法和流程，给出了滚动轴承MTTF和平均失效率的计算示例。解决了利用设计参数(工作寿命、可靠度、动载荷等)计算滚动轴承MTTF和平均失效率的问题，可为滚动轴承及其配套产品的可靠性预计和分析提供数据和方法支持。

Calculation method for mean time to failure of rolling bearings

Mean time to failure (MTTF) and mean failure rate of rolling bearings are significant basic data for revolving mechanical equipment reliability prediction and analysis. The confidence degree of conventional MTTF and data of rolling bearing rooted in statistical sample information is not high, so it is difficult to restrict reliability quantitative design of rolling bearing. Utilizing calculation method for fatigue life of rolling bearing, based on the relationship study of rolling bearing life and its reliability, deduced calculation formula for MTTF and mean failure rate of Weibull distribution, this paper provides a kind of calculation method and procedure for MTTF and of rolling bearing, also provides a calculation example. The problem of utilizing design parameters (life/reliability/dynamic load, etc.) to calculate the MTTF and mean failure rate of rolling bearing is solved, which can provide data and method support for rolling bearing and assembled product reliability prediction and analysis.