一类复式自适应Bang—Bang控制系统的研究

提出由Bang-Bang控制器、PID控制器、辨识装置、参考模型组成的复式自适应Bang-Bang控制系统,可用于参数未知或时变的时滞对象.具体介绍控制系统结构和数字仿真.     

Bang–Bang Refocusing of a Qubit Exposed to Telegraph Noise

Solid state qubits promise the great advantage of being naturally scalable to large quantum computer architectures, but they also possess the significant disadvantage of being intrinsically exposed to many sources of noise in the macroscopic solid-state environment. With suitably chosen systems such as superconductors, many of sources of noise can be suppressed. However, imprecision in nanofabrication will inevitably induce defects and disorder, such as charged impurities in the device material or substrate. Such defects generically produce telegraph noise and can hence be modelled as bistable fluctuators. We demonstrate the possibility of the active suppression of such telegraph noise by bang–bang control through an exhaustive study of a qubit coupled to a single bistable fluctuator. We use a stochastic Schrödinger equation, which is solved both numerically and analytically. The resulting dynamics can be visualized as diffusion of a spin vector on the Bloch sphere. We find that bang–bang control suppresses the effect of a bistable fluctuator by a factor roughly equalling the ratio of the bang–bang period and the typical fluctuator period. Therefore, we show the bang–bang protocol works essentially as a high pass filter on the spectrum of such telegraph noise sources. This suggests how the influence of 1/f-noise ubiquitous to the solid state world could be reduced, as it is typically generated by an ensemble of bistable fluctuators. Finally, we develop random walk models that estimate the level of noise suppression resulting from imperfect bang–bang operations, such as those that cannot be treated as -function impulses and those that have phase and axis errors. PACS: 03.65.Yz, 03.67.Lx, 05.40.-a     

基于Bang—Bang的PID参数自整定算法及其应用

在Astrom提出的PID参数自整定方法的基础上,经整理、完善后,得出一类新的不对称有均值的Bang-Bang控制来识别系统的临界点,并算出调节器的PID参数。文未介绍了用于工业锅炉控制的情况。     

弹载电液舵机的Bang—Bang＋PID双模控制研究

本文结合一弹载电液舵机系统,介绍了电液位置伺服系统的工作原理。经过推导,建立了该舵机的数学模型。在MATLAB／Simulink中搭建了舵机的仿真模型,分别对PID控制和Bang—Bang控制进行了仿真,仿真结果表明这两种控制方法无法获得满意的控制效果。为取得良好的控制效果,将PID控制和Bang－Bang控制相结合,设计TBang-Bang＋PID双模控制器,提高了系统的控制效果。     

天才的IT用语大补贴 IT English in The Big Bang Theory

四个天才宅男科学家和一个性感美女服务生之间会发生怎样的故事呢？就让《生活大爆炸》（The Big Bong Theory）来告诉你吧。     

Bang–bang control model with optimistic value criterion for uncertain switched systems

This paper studies an optimal control problem for uncertain switched linear systems with subsystems perturbed by uncertainty. A model for this problem is investigated with optimistic value criterion. The goal is to jointly design a deterministic switching law and a continuous feedback to optimize an uncertain objective function. A two-stage algorithm is applied to handle such model. In the first stage, the maximum value of the objective function and the bang–bang control are obtained under fixed switching instants, and in the second stage, GA and PSO algorithm are used to get the optimal switching instants, respectively. An example is shown to validate the method.     

Optimal PID Control of Spatial Inverted Pendulum With Big Bang – Big Crunch Optimization

As the extension of the linear inverted pendulum (LIP) and planar inverted pendulum (PIP), this paper proposes a novel spatial inverted pendulum (SIP). The SIP is the most general inverted pendulum (IP) than any existing IP. The model of the SIP is presented for the first time. The SIP inherits all the characteristics of the LIP and the PIP, which is a nonlinear, unstable and underactuated system. The SIP has five degrees of motion freedom and three control forces. Thus, it is a multiple-input and multiple-output (MIMO) system with nonlinear dynamics. To realize the spatial trajectory tracking of the SIP, the control structure with five PID controllers will be designed. The parameter tuning of the multiple PIDs is a challenging work for the proposed SIP model. To alleviate the difficulties of the parameter tuning for the multiple PID controllers, optimal PIDs can be achieved with the help of Big Bang-Big Crunch (BBBC) optimization. The BBBC algorithm can successfully optimize the parameters of the multiple PID controllers with high convergence speed. The optimization performance index of the BBBC algorithm is compared with that of the particle swarm optimization (PSO). Simulation results certify the rightness and effectiveness of the proposed control and optimization methods.      

情定七夕“音”你而在 Bang & Olufsen甄选七夕佳礼

正情定织女牛郎相会之时,纵隔千里亦相知。一"声"一世一双人,丹麦奢华生活品牌BangOlufsen为有情人甄选七夕佳礼,见证心动与相守的每时每刻。当温柔的粉色加入了Beoplay E8无线充电款(即2.0)耳机的豪华套餐。无线耳机、无线充电盒、无线充电板三者相合,是真无线产品的完美诠释,也是现代独立女性的挚爱之选。     

豪华车“爱上”高级音响系统——2007年奥迪S8配置Bang & Olufsen高级音响系统

一直以来,caraudio杂志都在坚持做原车音响系统测评。不管其配置有多高级,较之汽车售后市场的同类产品,它总是略逊一筹。我们能够轻而易举看出它们二者之间的差异,但随着时间的推移,它们之间的差距正在日益缩少。