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范大鹏 《计算机辅助设计与制造》2012,(1):38-41
本文以某铁路设备企业为背景,介绍了SolidWorks Enterprise PDM融合国际轨道交通工业标准在该企业的应用。 相似文献
3.
无级变速传动装置(CVT)的速比连续变化特性可以使发动机转速工作在理想状态下,一直以来都是无级变速系统的核心控制问题.通过对发动机试验数据的整理,获得发动机最佳经济性(动力性)目标转速图.分析无级传动系统的工作原理,建立其动力学微分方程,并基于Matlab/Simulink工具箱搭建仿真模型和设计速比控制算法,并仿真计算汽车在给定加油门起步、减油门行驶和高速制动三种典型行驶工况下的动态响应,最后由试验验证模型的正确性.结果表明设计的无级变速控制策略和模糊PID控制方法可以实现速比的合理变化,为进一步开发无级变速器的控制策略提供必要的前期准备. 相似文献
4.
The quality of the micro-mechanical machining outcome depends significantly on the tracking performance of the miniaturized
linear motor drive precision stage. The tracking behavior of a direct drive design is prone to uncertainties such as model
parameter variations and disturbances. Robust optimal tracking controller design for this kind of precision stages with mass
and damping ratio uncertainties was researched. The mass and damping ratio uncertainties were modeled as the structured parametric
uncertainty model. An identification method for obtaining the parametric uncertainties was developed by using unbiased least
square technique. The instantaneous frequency bandwidth of the external disturbance signals was analyzed by using short time
Fourier transform technique. A two loop tracking control strategy that combines the μ-synthesis and the disturbance observer
(DOB) techniques was proposed. The μ-synthesis technique was used to design robust optimal controllers based on structured
uncertainty models. By complementing the μ controller, the DOB was applied to further improving the disturbance rejection
performance. To evaluate the positioning performance of the proposed control strategy, the comparative experiments were conducted
on a prototype micro milling machine among four control schemes: the proposed two-loop tracking control, the single loop μ
control, the PID control and the PID with DOB control. The disturbance rejection performances, the root mean square (RMS)
tracking errors and the performance robustness of different control schemes were studied. The results reveal that the proposed
control scheme has the best positioning performance. It reduces the maximal errors caused by disturbance forces such as friction
force by 60% and the RMS errors by 63.4% compared with the PID control. Compared to PID with DOB control, it reduces the RMS
errors by 29.6%. 相似文献
5.
Accurate parameter identification is essential when designing controllers for inertially stabilized platforms (ISPs). But traditional identification methods suffer from observation measurement noise and operating restrictions of ISPs. To address this issue, a novel identification method based on current command design and multilevel coordinate search (MCS) algorithm without any higher order measurement differentiations was proposed. The designed current commands were adopted to obtain parameter decoupled models with the platform operating under allowable conditions. MCS algorithm was employed to estimate the parameters based on parameter decoupled models. A comparison experiment between the proposed method and non-linear least square method was carried out and most of the relative errors of identified parameters obtained by the proposed method were below 10%. Simulation and experiment based on identified parameters were conducted. A velocity control structure was also developed with disturbance observer (DOB) for application in disturbance compensation control system of an ISP. Experimental results show that the control scheme based on the identified parameters with DOB has the best disturbance rejection performance. It reduces the peak to peak value (PPV) of velocity error integral to 0.8 mrad which is much smaller than the value (10 mrad) obtained by the single velocity controller without DOB. Compared with the control scheme based on sweep model with DOB compensation, the proposed control scheme improves the PPV of velocity error integral by 1.625 times. 相似文献
6.
依托于光电稳瞄平台的理论模型来进行实测频率特性的系统辨识,由此建立与理论和实测模型均较吻合的系统仿真模型.并针对光电稳瞄平台的系统要求和应用特性设计了模糊+经典复合型控制方法.经典方式的零极点配置控制器低频增益高、系统稳态误差小.实际应用表明:光电稳瞄平台的隔离度达到了1%以内,实测的系统稳像精度达到较高的指标要求.二维模糊控制器可减小系统超调、缩短系统响应时间、并适当提高系统响应带宽,采用智能协调器切换经典控制器和模糊控制器,使系统的隔离度小于1%的同时,将超调从50%减少到4%,达到较好的控制效果. 相似文献
7.
动力调谐陀螺再平衡回路技术的发展与研究现状 总被引:2,自引:0,他引:2
分别介绍了动力调谐陀螺模拟和数字脉冲再平衡回路的发展与研究现状,分析了两种再平衡回路由于线路引起漂移误差的主要原因,比较了模拟和数字再平衡回路的优缺点.探讨了用DSP直接数字控制实现再平衡回路的方法及这种方法的优缺点,给出了数字控制回路中值得研究的问题. 相似文献
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针对火箭炮稳瞄系统存在较大的不确定性及干扰,其特征参数、阻尼以及负载干扰等,将随着被控炮之间的差异、载弹量、目标位置的变化及工作海况的影响而产生较大变化的特点,提出了一种PFC—PID串级透明控制策略,通过内环PID控制来提高抗干扰性,外环采用预测函数控制来获得良好的跟踪系能和强鲁棒性。通过仿真验证了该方法具有良好的鲁棒性和抗干扰能力及跟踪性能。 相似文献
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