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针对无刷直流电机传统控制的不足,在DSP控制框架内设计了电机的专家整定PID控制系统;系统将DSP技术和专家控制技术相结合,DSP在完成信息分析处理和协调各部件等工作的同时,计算出无刷直流电机转子转速,转速值与上位机设定值比较后,将差值送入专家整定PID控制器,利用专家整定PID控制器快速、灵活、准确的参数整定优势,输出合适的PWM占空比控制转速,实现电机的闭环控制;仿真结果显示,该控制方法与普通PID控制相比,具有响应快、误差小、抗负载扰动能力强等优点,验证该方案的有效性,具有一定的应用借鉴意义。 相似文献
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建立了微透析取样-流动注射电化学检测法测定表柔比星与牛血清白蛋白体外结合参数的方法。流动相为pH 3.0的0.1 mol/L H3PO4-NaH2PO4缓冲液(含3.4×10﹣5mol/L Na2EDTA),流速为0.3 mL/min。电化学检测的工作电极为玻碳电极,工作电位为0.52V。表柔比星浓度在5.0×10-5～5.0×10-7 mol/L范围内与峰电流呈良好的线性关系,其相关系数为0.9997,检出限为2.0×10-7mol/L。结合微透析取样,实现了对表柔比星与牛血清白蛋白结合参数的测定。表柔比星与牛血清白蛋白的体外结合符合Scatchard曲线,结合常数和结合位点数分别为2.41×104L/mol和4.02。 相似文献
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The inflation of a five-ring cone parachute with the airflow velocity of 18 m/s is studied based on the simplified arbitrary Lagrange Euler (SALE)/fluid-structure interaction (FSI) method. The numerical results of the canopy shape, stability, opening load, and drag area are obtained, and they are well consistent with the experimental data gained from wind tunnel tests. The method is then used to simulate the opening process under different velocities. It is found that the first load shock affected by the velocity often occurs at the end of the initial inflation stage. For the first time, the phenomena that the inflation distance proportion coefficient increases and the dynamic load coefficient decreases, respectively, with the increase in the velocity are revealed. The above proposed method is competent to solve the large deformation problem without empirical coefficients, and can collect more space-time details of fluid-structure-motion information when it is compared with the traditional method. 相似文献
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