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<p>The vibration behavior of ball and journal bearings at 600, 1200, 1800, and 2400&#xa0;rpm is investigated in this work. A rotor-bearing system was built with replaceable bearings and high-precision vibration sensors to measure vertical (CH1) and horizontal (CH2) vibration amplitudes, which were the primary directions of interest under radial loading. Apart from time-domain data and average amplitudes, the work comprises directional vibration analysis using the CH2/CH1 ratio to improve dynamic behavior evaluation. Inappropriate damping causes dominant vertical vibrations in ball bearings at low speeds; their directional behavior stays pretty constant as speed increases. But because of oil film instabilities like whirl or oil whip, journal bearings show lateral vibration at high speeds but work well at low speeds. The CH2/CH1 study underlines significant stability variations between the two bearing types and validates speed-dependent vibration directionality. The findings offer rational guidance: For vertically loaded, wide-speed-range applications, ball bearings are better than journal bearings; Journal bearings, in particular, require careful design at high speeds to reduce horizontal instabilities. These results enhance bearing choice and dynamic performance in fast rotating systems.</p>

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A Comparative Analysis of the Performance of Ball Bearings and Journal Bearings Under Varying Rotational Speeds

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • Nazik Abdulwahid Jebur,
  • Wafa Abd Soud

摘要

The vibration behavior of ball and journal bearings at 600, 1200, 1800, and 2400 rpm is investigated in this work. A rotor-bearing system was built with replaceable bearings and high-precision vibration sensors to measure vertical (CH1) and horizontal (CH2) vibration amplitudes, which were the primary directions of interest under radial loading. Apart from time-domain data and average amplitudes, the work comprises directional vibration analysis using the CH2/CH1 ratio to improve dynamic behavior evaluation. Inappropriate damping causes dominant vertical vibrations in ball bearings at low speeds; their directional behavior stays pretty constant as speed increases. But because of oil film instabilities like whirl or oil whip, journal bearings show lateral vibration at high speeds but work well at low speeds. The CH2/CH1 study underlines significant stability variations between the two bearing types and validates speed-dependent vibration directionality. The findings offer rational guidance: For vertically loaded, wide-speed-range applications, ball bearings are better than journal bearings; Journal bearings, in particular, require careful design at high speeds to reduce horizontal instabilities. These results enhance bearing choice and dynamic performance in fast rotating systems.