Which pulley diameter should be entered?

Use pitch diameter for synchronous belts. For V-belts use the applicable datum/effective diameter and matching datum/effective belt length from the selected manufacturer system; do not substitute outside diameter.

What does belt-loop frequency mean?

It is the rate at which one marked point on the belt completes a full circuit, equal to pitch-line speed divided by pitch/datum belt length.

Does the calculator include slip?

No. Shaft ratio and loop frequency use ideal no-slip kinematics. A V-belt drive with slip requires measured speeds or a validated slip model.

Do 2× and 3× prove two defects or severe wear?

No. They are only mathematical harmonics of loop frequency. Diagnosis requires spectra, phase, operating condition and inspection.

Can shaft speeds define a belt-flutter frequency range?

No universal range is derived from shaft speeds alone. Span natural frequencies depend on tension, span length, mass per length and boundary conditions.

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皮带环路频率与轴频计算器

根据匹配的节线/基准尺寸计算理想无滑移皮带环路频率、节线速度和轴频率。

节线/基准几何尺寸无滑移运动学仅供参考，非诊断

运动学计算结果

皮带环路频率

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节线速度

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主动轴频率

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从动轴频率 / 转速

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速比 n₂/n₁ = d₁/d₂

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环路频率的数学谐波

多种的	赫兹	次/分钟

仅凭谐波存在无法确定唯一的故障或严重程度。

理想无滑移运动学

v = π d₁ n₁ / 60,000 [m/s]

f_环形 = v / (L/1000) = π d₁ n₁ / (60 L)

n₂ = n₁ d₁/d₂; f₁=n₁/60; f₂=n₂/60

所有长度输入必须描述同一节线/基准系统。Gates 区分同步链轮的节线直径与外径；Optibelt 同样区分同步带节线直径与 V 带基准直径/长度。

资料来源： Gates 轻型动力与精密传动手册, Gates 同步带设计手册，和 Optibelt V 带手册.

诊断边界： 局部皮带特征可能以环路频率重复出现，但谐波并非一对一的故障标签。皮带跨距固有频率取决于张力、自由跨距、单位长度质量和边界条件；它并不普遍受限于两个轴频率。