围网渔船起网时受力的实测与分析

通过对围网渔船起网过程中所受外力的实测和分析,表明在绞收括纲阶段临近结束时,即底环集中串挂在船舷括纲吊柱处时的外力,最大可达7,140公斤。起网时外力对船作用最终表现为外力矩,其数值与网具的纲索或网衣相对于船的出水点位置以及各种捕捞、起吊设备的安装位置有关,也即与力的作用线方向和作用点有关。作者认为在围网渔船稳性核核中,仅校核起吊底环和绞收网衣时的倾侧力矩是不够的,应选取整个起网过程中最大起网力矩(绞纲阶段末尾的倾侧力矩)用于渔船稳性校核和摇摆计算。

REALTIME RECORDS AND ANALYSIS OF OUTER FORCE ACTING ON PURSE SEINER DURING HAULING PROCEDURE

The result, which comes from the measurements and analysis duringthe purse seiner hauling, shows that the maximum outer force is up to 7140kg whileall rings were gathered and hung on the davit at the port-side during the end ofpurse line hauling stage. The moment of outer force, which shows the influence ofouter force on the vessel, is affected by the position of each hauling and lifting eq-uipment and the relative position of the point where the net and rope come out ofthe water surface, in another word, which has relation with the direction and posi-tion of outer force. The author pointed out that for the checking and examining thestability of the purse seiner, it is not accurate and sufficient enough to choose theinclining moment only in purse rings lifting and netting hauling stage. The maxi- mum of inclining moment througbout the hauling procedure should be carefullychosen, which occurs at the end of purse line hauling stage.