The dynamic performances of the force and location adjusted fashion are satisfactional . the results of theory and experiment are consistent . the results of experiment express the dynamic performances of the hyd raulic hitch are satisfactional to tractor 试验结果表明，采用比例阀的液压悬挂系统位调节和力调节都具有良好的静动态性能，并且与理论分析结果一致，因此能达到对拖拉机农具控制的静动态品质要求。
The design of force feedback loop is emphasized on the base of theory analysis . then proportional - integral controller and lag - lead compensator are designed to improve dynamic performance of this kind of gyro . the main work includes optimizing parameters and system simulation 用matlab分析了陀螺本体传递函数的波德图,然后通过采用比例-积分控制和迟后-超前校正及参数优化、系统仿真,使陀螺系统的固有频率得到显著提高。
The utilization theories such as finance and accounting , finance , business management and market marketing etc . is involved . the proportion analysis methods such as mathematical model etc are also used . to find the risk that the enterprise exists and to give a warning to management person are the premise to carry on the crisis guard 它贯穿于企业经营活动的全过程，以企业的财务报表、经营计划及其他相关的财务资料为依据，利用财会、金融、企业管理、市场营销等理论，采用比例分析，数学模型等方法，发现企业存在的风险，并向经营者示警。
Electro - hydraulic control principle applied in construction machinery is analyzed in this paper ; working principle and application characteristic of electro - hydraulic proportional is lucubrated ; technique and static characteristic of electro - hydraulic proportional decompression value and electro - hydraulic proportional direction value is emphatically analyzed and studied ; electro - hydraulic proportional control mode is setup . the hydraulic circuit which can be not only suit for handle operation but also for remote operation in the same construction machinery , and the hydraulic system design methods is also introduced that the proportion control use d for the steering devices and the working devices of the machine 本文对工程机械上应用的电液控制原理进行了分析；对电液比例阀的工作原理和应用特点进行了深入研究；重点对电液比例减压阀和电液比例方向阀技术特征和静态特性进行分析研究；建立电液比例控制模型；提出了在同一台工程机械上，既能满足遥控又能满足手控的液压回路，以及采用比例量控制行驶和工作装置的液压系统设计方法。
So the vsr can operate in any power factor . internal model control ( imc ) design concept has been introduced to the unbalanced control system of vsr . with imc design concept , the unbalanced control system not only achieve zero steady state error of sinusoidal ac current , but also obtains strong robustness of the control system 由于在abc和静止坐标系中，采用比例和比例积分调节器无法实现对时变正弦波信号的无差跟踪控制，而在dq坐标系中需要用正、反两套旋转坐标系构成四个电流内环才能实现对正、负序dq电流的无差跟踪。
Secondly , proportional arc length method is used to conformal mapping process of asymmetry sections so as to solute the 2d radiation problem with the method of multipole expansion . on the basis of above , 3d hydrodynamic coefficients are given and motions of the container ship flokstra are predicted considering the initial heel 然后，采用比例弧法对全剖面进行保角变换并在此基础上用多极展开法计算非对称剖面的辐射流场，进而采用切片理论合成全船的水动力系数并对flokstra集装箱船进行了考虑横倾影响的运动响应预报。
Next , consulting current feedback control , the flux feedback control algorithm is designed . this algorithm has two loops , the inner loop is flux feedback loop , the outer one is air gap feedback loop ; the outer loop uses pid controller whose output is expected flux density , the inner uses the proportional or pi controller whose output is the magnet control voltage 其次,参照电流环控制的串级思想,设计出了基于磁通反馈的悬浮控制算法,该算法也采用双环控制,内环为磁通环,外环为位置环;外环采用pid控制器,输出为期望磁通密度,内环采用比例或比例积分控制器,输出为电磁铁控制电压。
