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.

免費工程工具

皮帶迴圈與軸頻率計算器

根據匹配的節距/基準尺寸，計算理想無滑動皮帶迴圈頻率、節線速度與軸頻率。

節距/基準幾何無滑動運動學僅供參考，非診斷

運動學結果

皮帶迴圈頻率

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節線速度

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驅動軸頻率

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被驅動軸頻率 / 轉速

—

速比 n₂/n₁ = d₁/d₂

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數學迴圈頻率諧波

多重	Hz	cycles/min

僅憑諧波存在無法識別獨特故障或嚴重度。

理想無滑動運動學

v = π d₁ n₁ / 60,000 [m/s]

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

n₂ = n₁ d₁/d₂; f₁=n₁/60; f₂=n₂/60

所有長度輸入必須描述同一節距/基準系統。Gates 區分同步皮帶輪的節距直徑與外徑；Optibelt 同樣區分正時皮帶節距直徑與 V 型皮帶基準直徑/長度。

來源： Gates 輕型動力與精密手冊, Gates 正時皮帶設計手冊，以及 Optibelt V 型皮帶手冊.

診斷邊界： 局部皮帶特徵可能以迴圈頻率重複，但諧波並非一對一的故障標籤。皮帶跨距自然頻率需考慮張力、自由跨距、單位長度質量與邊界條件；其並不受兩軸頻率普遍限制。