基于丢包约束的网络化控制系统跟踪性能极限

发布时间：2018-03-04 11:52

本文选题：网络化控制系统　切入点：量化　出处：《湖北师范大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着通信网络技术的发展,网络被引入到控制系统并成为了当下的一个重要的话题。在实际生活应用环境中,网络化控制系统是通过使用通信网络将位于不同空间、地理位置上的物理设备连接起来的一种通信系统,从而实现信息的相互传递,具备方便、快捷、易于传输和维护等优点。然而网络化控制系统在为生活带来便利的同时自身也面临着一系列新的问题:由于网络自身的特性,信号在网络中传输时可能出现数据丢失、量化、时延以及噪声、带宽约束等,我们将这些约束称为网络参数约束。当网络化控制系统出现这些参数约束时,其性能也将会遭到很大破坏,有时甚至会使得系统失稳。因此本文的工作是考虑丢包存在于信道时的网络化控制系统性能极限情况,并同时考虑其它参数存在时对系统性能极限的共同影响。具体内容如下:在网络化控制系统的性能研究中,鉴于目前对量化和丢包同时存在于信道的研究还少有涉及,因此考虑前向通道中存在量化约束以及反馈通道存在丢包约束的网络化控制系统跟踪性能极限问题。从获得的结论可以看出网络化控制系统跟踪性能极限和给定对象的内部特性(非最小相位零点位置和不稳定极点位置)以及量化间隔、丢包有关。结果也表明了量化间隔和丢包是怎样从根本上约束着系统的跟踪性能极限的。在目前研究网络化控制系统性能的很多文献中,为了确保跟踪性能的有效性,往往假定了被控对象至少含有一个积分器,但是在实际应用中,若被控对象不含积分器,则得到的系统性能就是无效的,也就是说使用先前的性能指标来分析不含积分器的系统是不合理的,那么在此种情况下就需要采用一种新的修改性能指标。此外,信道中时延和丢包的同时存在以及信道输入能量约束也将会对控制系统的性能极限产生很大的影响,而之前对以上网络参数在信道中同时存在的研究还少有涉及。因此在基于丢包约束的基础上同时分析网络信道输入能量的限制进而考虑网络化时滞系统修改跟踪性能极限问题。获得的结论说明了时滞系统修改跟踪性能极限和被控对象的非最小相位零点位置、不稳定极点位置以及时延等内部特性是息息有关的。同时研究结果还表明修改因子、数据包丢失也对时滞系统的修改跟踪性能极限产生着非常大的影响。在现实生活的实际应用中,网络通信的带宽不可能是无限的。当丢包和带宽约束同时存在于通信信道时,系统性能将受到很大影响。所以基于数据包丢失和信道带宽受限的共同约束,采用修改跟踪性能指标来讨论控制系统修改跟踪性能极限问题就是很有必要的。从获得的结论能够看出,系统修改跟踪性能与给定对象的非最小相位零点位置、不稳定极点位置还有它们的方向是息息相关的。另外,从结果也可以看出,修改因子、带宽、丢包以及信道输入能量对系统的修改跟踪性能极限也有很大的影响。
[Abstract]:With the development of network technology, network is introduced into the control system and has become an important topic of the moment. In real life applications, the network control system is through the use of communication network will be located in the same space, a communication system physical device geographically connected together, so as to realize the information mutual transfer, with convenient, fast, easy transmission and maintenance. However, the networked control system for the convenience of life itself is also facing a series of new problems: because the network characteristics, data loss, may signal is transmitted in the network delay and quantization noise, bandwidth constraints etc. we will, these constraints are called network parameter constraints. When the network control system of these conditions, its performance will suffer enormous damage, sometimes even makes the system unstable. The work of this paper is to consider the network packet loss in channel control system performance limit, and at the same time considering the common effect on the system performance limits of other parameters exist. The specific contents are as follows: in the network performance of the control system, in view of the current research on quantization and packet loss also exists in the channel is less to consider therefore exists in the forward channel of the tracking performance limitations of network system and feedback channel quantization constraint constraint dropout control. The conclusion can be seen from the network control system of tracking limit and internal characteristics of the given object (non minimum phase zero position and unstable pole position) and quantization interval, packet loss the results also indicated that the quantization interval and packet loss is how to fundamentally constrain the tracking performance limit of the system. In the current research of network control A lot of literature system performance, in order to ensure the effectiveness of tracking performance, we tend to assume that the object contains at least one integrator, but in practical application, if the object does not contain the integrator, then the system performance is invalid, that is to analyze the system without integrator is not reasonable use before the first performance, so in this case you need to adopt a new performance index. In addition, time delay and packet loss channels exist at the same time and channel input energy constraint on the control system performance will also limit influence, and prior to the above research on network parameters existed in the same channel. There are less involved. So at the same time analysis network channel input energy based on packet loss constraints limit on the network delay and then consider the system to modify the tracking performance limitations. The results show that the time delay system to modify the non minimum phase zero position tracking performance and the limit of the controlled object, unstable internal characteristics of pole position and time delay are closely related. The results also showed that the modification factor, packet loss of time delay system modification of tracking performance limitations have a very big impact. In practical life, the bandwidth of network communication is not limitless. When the packet loss and bandwidth constraints also exist in the communication channel, the system performance will be greatly affected. So based on common constraint packet loss and limited channel bandwidth, the change tracking performance index to discuss the control system modifies the tracking performance limitations it is very necessary. From the conclusion that the system modify the non minimum phase zero position tracking performance with a given object, unstable poles Location is also closely related to their direction. In addition, from the result, we can see that modifying factors, bandwidth, packet loss and channel input energy have great influence on the system's modification and tracking performance limit.

【学位授予单位】：湖北师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP273

【参考文献】