本文關(guān)鍵詞： 滑動軸承 軸心軌跡控制 混合靈敏度 回路成形 半實物仿真　出處：《山東大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

【摘要】：非圓異形截面結(jié)構(gòu)能夠顯著提高零件的性能和使用壽命,但由于非圓異形截面結(jié)構(gòu)的特殊性,給此類零件的加工提出了難題。本文以基于電磁激勵的滑動軸承系統(tǒng)的主軸運動軌跡控制為出發(fā)點,研究了轉(zhuǎn)子運動軌跡的主動控制技術(shù),以期為非圓異形截面零件的加工提供一種新方法。綜合分析了傳統(tǒng)的以及最新發(fā)展的各種加工非圓異形截面零件的方法以及伺服驅(qū)動裝置,提出了基于電磁激勵控制的滑動軸承中心軌跡的方法,來實現(xiàn)主軸按照預(yù)定非圓軌跡運動。實現(xiàn)思路是油膜力作為主要支撐力,電磁力作為控制力,通過伺服控制技術(shù)實時控制勵磁電流,從而控制電磁鐵與轉(zhuǎn)子之間的作用力,從而達到控制轉(zhuǎn)子運動軌跡的目的。 對軸承系統(tǒng)進行了理論研究,建立了滑動軸承傾轉(zhuǎn)主軸的運動模型和動力學(xué)模型,推導(dǎo)了主軸發(fā)生傾轉(zhuǎn)時的油膜壓力分布Reynolds方程,推導(dǎo)了油膜厚度方程。用差分法對油膜壓力分布進行了計算,用辛普森積分法對油膜力矩進行了求解。推導(dǎo)了電磁力矩的表達式,用運動學(xué)方法對轉(zhuǎn)子軸心軌跡進行了計算�；谳S承的局部線性化的模型建立了擾動壓力Reynolds方程,對軸承系統(tǒng)八個特性系數(shù)進行了理論分析計算。研究了轉(zhuǎn)速和勵磁電流對特性系數(shù)的影響,建立了被控對象的無量綱動力學(xué)模型,對控制方案進行了分析。 研究了滑動軸承系統(tǒng)基于魯棒Hoo的控制方法,被控對象可觀可控,可以通過狀態(tài)反饋實現(xiàn)輸入輸出解耦�；谌謱�(yōu)的遺傳算法設(shè)計魯棒H∞混合靈敏度控制器,該控制器實現(xiàn)被控對象輸出對參考信號的良好跟蹤,并對外界擾動有一定的抑制作用,但由于解耦矩陣對模型攝動比較敏感,僅能容許模型小幅攝動�；隰敯鬑∞回路成形方法直接對耦合系統(tǒng)設(shè)計控制器,實現(xiàn)輸入輸出解耦,對控制器進行降階處理,該控制器對模型攝動和外界擾動均有較好的抑制作用,滿足魯棒性能和魯棒穩(wěn)定性要求。 對滑動軸承轉(zhuǎn)子軌跡控制實驗進行了設(shè)計,提出基于xPC Target的硬件在回路的控制仿真實驗方法。搭建了xPC Target仿真平臺,對xPC Target平臺進行了通信和信號輸入輸出測試,對電容式位移傳感器進行了標定,由于時間和實驗條件有限,未完成硬件在回路仿真實驗。
[Abstract]:Non-circular special-section structure can significantly improve the performance and service life of the parts, but due to the particularity of non-circular special-shaped cross-section structure. In this paper, the active control technology of rotor motion trajectory is studied based on the spindle motion trajectory control of the sliding bearing system based on electromagnetic excitation. In order to provide a new method for the machining of non-circular special-section parts, this paper synthetically analyzes the traditional and newly developed methods of machining non-circular special-section parts and the servo drive device. A method based on electromagnetic excitation control is proposed to realize the spindle moving according to the predetermined non-circular trajectory. The realization idea is that the oil film force is the main supporting force and the electromagnetic force is the control force. The excitation current is real-time controlled by servo control technology to control the force between the electromagnet and the rotor, so as to control the track of the rotor motion. This paper studies the bearing system theoretically, establishes the motion model and dynamic model of sliding bearing tilting spindle, and deduces the Reynolds equation of oil film pressure distribution when the spindle tilts. The oil film thickness equation is derived, the oil film pressure distribution is calculated by difference method, the oil film torque is solved by Simpson integral method, and the expression of electromagnetic torque is derived. The rotor axis trajectory is calculated by kinematics method, and the Reynolds equation of disturbance pressure is established based on the local linearization model of the bearing. Eight characteristic coefficients of bearing system are theoretically analyzed and calculated. The effects of rotational speed and excitation current on the characteristic coefficients are studied. The dimensionless dynamic model of the controlled object is established and the control scheme is analyzed. The control method of sliding bearing system based on robust Hoo is studied. The controlled object is observable and controllable. The robust H 鈭，

本文編號：1462795