... stroke of polished rod 光杆冲程 submarine drilling engineering 海底钻井工程 submarine pipeline 海底管道 ...
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The minimum polished rod load occurs near the top of the stroke with the start of the downstroke.
最小光杆负荷发生在下行冲程开始时的冲程顶部附近。
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The peak polished rod load occurs near the bottom of the stroke with the start of the upstroke.
最大光杆负荷发生在上行冲程开始时的冲程底部附近。
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