旋網用油圧ウインチの力学特性

抄録

Relationships of velocity (V_w; m/s) and of effective force (F_w; kgw) of a hydraulic purse winch during fishing operation were obtained by using only the engine revolution (N_e; rpm) and the effec-tive output pressure of an oil pump (P-P_o; kgw/cm²), respectively. Using the loaded (i.e. pulling the net) P (kgw/cm²) and the non-loaded (i.e. without pulling the net) P_o (kgw/cm²) pressure of the pump, V_w and F_w could be expressed respectively as
V_w=K_v(q_p/q_w)N_e and F_w=k_fq_w(P-P_o),
where ku and k_f are constants, q_p (l/rev) and q_w (l/rev) are the displacement of the pump and the winch, respectively. Without using special instruments, V_w and F_w of the purse winch can be calculated applying the equations obtained. This simplified method is useful for the Third World Countries where sufficient instruments could not be provided for research works mainly due to economic problems.