最小光杆负荷发生在下行冲程开始时的冲程顶部附近。
The minimum polished rod load occurs near the top of the stroke with the start of the downstroke.
最大光杆负荷发生在上行冲程开始时的冲程底部附近。
The peak polished rod load occurs near the bottom of the stroke with the start of the upstroke.
光杆上行冲程时的最大负载与下行冲程时的最小负载之差。
The difference in the peak load on the upstroke and the minimum load on the downstroke of a polished rod.
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