CAJ | 학술논문

分析电液伺服系统中液压缸活塞位移、液压刚度、阀口开度、外负载刚度及阀芯与阀套间径向间隙对伺服阀阀口系数的影响。采用工作点线性化的处理方法，通过引入液压缸负载力方程，给出零开口电液伺服阀滑阀流量‐压力系数和流量增益的计算公式，并对其影响因素进行分析。结果表明，在液压缸全行程中，流量‐压力系数会随着液压缸活塞位移、外负载刚度及阀口开度的增加而增大，其中流量‐压力系数随液压缸活塞位移的增大呈抛物线增长，其最大值约为最小值的2倍；流量增益随着液压缸活塞位移、外负载刚度的增大而减小，其中流量增益随液压缸活塞位移的增大而近似呈线性规律减小，其最小值约为最大值的1／2；阀芯与阀套间径向间隙对阀口系数随液压缸活塞位移变化率的影响不大；阀口系数在液压刚度取最小值附近时存在突变；同一液压刚度值可对应2个不同的液压缸活塞位移，分别对应的阀口系数值相差非常大。
분석전액사복계통중액압항활새위이、액압강도、벌구개도、외부재강도급벌심여벌투간경향간극대사복벌벌구계수적영향。채용공작점선성화적처리방법，통과인입액압항부재력방정，급출령개구전액사복벌활벌류량‐압력계수화류량증익적계산공식，병대기영향인소진행분석。결과표명，재액압항전행정중，류량‐압력계수회수착액압항활새위이、외부재강도급벌구개도적증가이증대，기중류량‐압력계수수액압항활새위이적증대정포물선증장，기최대치약위최소치적2배；류량증익수착액압항활새위이、외부재강도적증대이감소，기중류량증익수액압항활새위이적증대이근사정선성규률감소，기최소치약위최대치적1／2；벌심여벌투간경향간극대벌구계수수액압항활새위이변화솔적영향불대；벌구계수재액압강도취최소치부근시존재돌변；동일액압강도치가대응2개불동적액압항활새위이，분별대응적벌구계수치상차비상대。
T he factors influencing the orifice coefficients of the servo valve including hydraulic cylinder piston displacement ,hydraulic rigidity ,orifice opening ,load rigidity and the radial clearance between spool and sleeve were analyzed .With the introduction of the hydraulic cylinder‐load equation ,the for‐mulas for flow‐pressure coefficient and flow gain of the servo spool valve were obtained by the linear‐ization of the flow equation at the operating point .The numerical calculations show that ,in the full hydraulic cylinder stroke ,flow‐pressure coefficient will increase with the increment of cylinder dis‐placement ,load rigidity and orifice opening ,exhibiting parabolic trend increase with the piston dis‐placement ,and the difference between the maximum and minimum value is about 2 times .Flow gain will decrease with the increase of cylinder piston displacement and load rigidity .The reduction of flow gain is approximately linear with the increase of the piston displacement ,and the minimum value is approximately half of the maximum .The rate of change of the hydraulic cylinder pistion displacement has little effect on the radial clearance between the valve core and flat .There are jumps in the orifice coefficients near the minimum hydraulic rigidity .The same hydraulic rigidity value corresponds to two different piston displacements ,and the orifice coefficients vary widely .