免费工程工具 #034
根据振动趋势预测的剩余寿命
根据振动趋势数据估算剩余使用寿命 (RUL)。使用线性、指数或幂律增长模型预测达到报警和危险级别所需的时间。
成果
预计振动水平
⚠️ 信心提示： 此估算假设当前的增长模式保持不变。实际剩余寿命取决于故障机制、运行条件、负载变化和维护措施。请将其作为规划参考，而非保证。更多的数据点和一致的测量条件可以提高准确性。
线性增长模型
假设振动以恒定速率增加：
线性模型适用于由侵蚀或堆积引起的逐渐磨损过程，例如不平衡量的逐渐增加。
指数增长模型
假设振动增长率与当前水平成正比（损伤加速）：
指数模型最能代表轴承退化和疲劳裂纹扩展，其中损伤会造成更大的损伤。
幂律模型
能够同时表示亚线性增长和超线性增长的通用模型：
幂律适用于混合退化模式。指数 p 决定了增长行为：p<1 为减速增长，p=1 为线性增长，p>1 为加速增长。
如何选择模型？
| 模型 | 最适合 | 行为 |
|---|---|---|
| 线性 | 逐渐磨损、侵蚀、堆积 | 恒定的变化率 |
| 指数 | 轴承损坏、裂纹扩展 | 加速——最保守 |
| 幂律 | 混合/未知机制 | 灵活——能够适应数据形状 |
实例
已知： V_baseline = 2.5 mm/s，V_current = 4.2 mm/s，经过时间 = 90 天，报警值 = 7.1 mm/s
指数模型：
k = ln(4.2 / 2.5) / 90 = ln(1.68) / 90 = 0.5188 / 90 = 0.00577/天
报警时间：t_alarm = ln(7.1 / 2.5) / 0.00577 = 1.0438 / 0.00577 = 自基线起181天
剩余 = 181 – 90 = 91天 从现在到警报级别
PF 间隔： 从可检测故障发生 (P) 到功能失效 (F) 之间的时间决定了您能获得多少预警。对于滚动轴承，故障检测间隔通常为 1 至 9 个月，具体取决于转速、负载和润滑条件。
Vibration trending provides a reasonable estimate when the fault mechanism produces a consistent growth pattern. Key factors for reliability:
- More data points over a longer period improve accuracy
- Consistent measurement conditions (same point, direction, load, speed)
- Understanding the failure mode helps select the right growth model
- Bearing degradation typically follows exponential growth
- Gradual wear (erosion, buildup) tends to follow linear growth
Treat estimates as planning guidance, not precise predictions. Always err on the side of caution.
Linear growth: Vibration increases at a constant rate (e.g., +0.5 mm/s per month). The time to reach any level is easy to predict. Common for gradual wear processes.
Exponential growth: The rate of increase accelerates over time. Early stages show slow change; later stages show rapid deterioration. Common for bearing damage and fatigue crack propagation.
Why it matters: Exponential growth is more dangerous because it can appear stable for a long time, then deteriorate rapidly. The "hockey stick" curve means the window between detectable change and failure can be short.
General guidelines based on ISO 20816 / ISO 10816 philosophy:
- Plan action when vibration reaches Zone B/C boundary (alarm level) or has increased 50% above baseline
- Schedule maintenance when trend projection shows alarm will be reached within the next planned shutdown window
- Urgent action when vibration reaches Zone C/D boundary (danger level) or has doubled from baseline
- Immediate shutdown when danger level is exceeded or sudden step change occurs
The key principle: schedule corrective action while you still have time to plan, source parts, and execute safely.
Factors that reduce prediction accuracy:
- Inconsistent measurement: Different probe positions, mounting methods, or sensor types
- Variable operating conditions: Load, speed, or temperature changes between measurements
- Step changes: Sudden events (impacts, process upsets) that shift the baseline
- Wrong growth model: Using linear when actual growth is exponential, or vice versa
- Insufficient data: Fewer than 3–4 data points makes trend fitting unreliable
- Multiple fault mechanisms: If more than one fault is developing, the combined trend may not follow a simple model
Recommended measurement intervals based on machine criticality:
- Critical machines: Continuous online monitoring (24/7)
- Important machines: Weekly to monthly route-based measurements
- General machines: Monthly to quarterly
When a trend is rising:
- Zone A→B transition: Increase to weekly
- Approaching alarm: Increase to daily or install temporary online monitoring
- Above alarm: Continuous monitoring until maintenance
The measurement interval must be shorter than the P-F interval (time from detectable fault to functional failure) divided by at least 3, to ensure you capture the trend and have time to act.
本页所述的操作流程由 Vibromera 团队使用 Balanset-1A（一款用于现场转子平衡的便携式双通道动平衡仪及振动分析仪）开发并经过实地测试。
专业振动监测，具备趋势分析和报警管理功能。防患于未然，预测潜在故障。已在全球50多个国家/地区使用。
Nikolai Shelkovenko
Nikolai Shelkovenko是一名振动分析工程师，也是Vibromera的创始人兼首席执行官。 15年多来，他一直在现场——而非在试验台上——为旋转设备进行平衡：粉碎机、工业风机、破碎机、离心机、轴和主轴。正是这些实际工作催生了Balanset系列仪器——它们被设计为一种专业人员可以随身携带到机器旁、在现场独立使用的工具，而非实验室设备。 Vibromera成立于2017年，自2023年起总部设于葡萄牙波尔图。Balanset系列产品的研发、组装与支持均在此完成。旗舰产品是Balanset-1A，一款用于单平面及双平面平衡和振动诊断的便携式分析仪。 Nikolai亲自参与客户支持工作，处理各种棘手的平衡案例，并参与软件开发。他以任何语言为全球客户提供服务。
