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A complete English edition of this article has not been published. The complete available Chinese version is shown below.

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Measuring principles4 min readContent language: ChineseUpdated 23 October 2026

振动传感器与变送器:轴振与壳振为什么不能直接比较?

轴振通常以探头为参考观察转轴的相对运动,壳振观察轴承座或机壳的运动。

先回答这个具体问题

轴振通常以探头为参考观察转轴的相对运动,壳振观察轴承座或机壳的运动。支承刚度、轴承结构和测量方向不同,二者可以同时变化,也可以表现不同。不能把轴位移峰峰值与壳体速度有效值直接比较大小。

壳体加速度、振动速度和轴相对位移是不同测量量。选择前先明确观察轴承座还是转轴,以及是状态趋势、故障诊断还是保护输入;不能仅按同一个“振动值”互相替代。

现场怎样核对

先画出各自参考点,核对传感器位置、物理量、幅值定义及频带;需要比较趋势时分别建立基线。

同时记录测点、原始信号、最终结果和发生时间。保留原始配置,一次只改变一个可控条件;只有单位、工况和处理规则一致时,两组数字才可直接比较。

四项核对清单

  • 先画出各自参考点,核对传感器位置、物理量、幅值定义及频带;需要比较趋势时分别建立基线。
  • 记录本题试验所用的输入条件、参考方法及设备状态,保留试验前的原始配置。
  • 对照实际订购型号核实接口和功能选项;公开原理与其他品牌示例不是本型号的性能保证。
  • 将结果分成已证实、尚未排除与需要厂家确认三类,未经验证不直接改标定系数。

假设案例:怎样得出判断

假设案例:轴振趋势上升而壳振变化很小,应核对轴承与测点条件,不能据此删除其中一个报警。 这个情景只用于说明本题的分析过程,并非真实客户案例。先按上述方法检查,再比较相同测点、相同工况下的结果;如果改变了安装、采样或配置,应保存变更前后的证据。仅观察到数值接近,不能证明根因已经解决,更不能据此推断整台设备长期运行合格。

客户与销售应怎样确认需求

客户向道威斯顿咨询本题时,可一并提供电机、泵和轴承座的振动测量链路的测点示意、工作条件和本题核对记录。销售应把问题转成具体的输入要求、安装条件、功能选项与验收证据,逐项交由技术人员确认。涉及设备保护、联锁或危险区域的试验,由现场负责人员批准;知识文章不替代设备制造商的停机条件或操作规程。

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