Papers by Keyword: Controllability

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Authors: Chang Ji Shan, Jun Luo, Lin Li, Nan Xu, Yu Qiong Shan
Abstract: This paper is aimed to reach such a conclusion that the result gained from the analysis of the micro-vibration of coupled-pendulums made by optimal control theory is as consistent and effective as with that from other approaches, by the virtue of writing out the Lagrange equation of the micro-vibration of coupled-pendulums with the external force and analyzing the system by using control theories.
Authors: Song Rong Cao, Jian Xing Yu, Gui Zhen Zhang, Wei Lin Ma
Abstract: Pendulous Installation Method is fit for the installation of subsea facilities in Liwan 3-1 field. In this paper, non-liner coupling time domain analyses of the hull, the sling and the manifold are conducted, combined with an investigation into the critical factors affecting the lowering process, to improve the controllability of the lowering process and to make proposals about Liwan project.
Authors: Peter Šolek, Marek Maták
Abstract: This article deals with the influence of optimal actuator and sensor placement on the active control of thin-walled mechanical systems. The approach used for optimal actuator and sensor placement is based on the evaluation norms and. The optimal actuator and sensor placement satisfied the requirements on the controllability, observability and spillover prevention. The investigation of the optimal placement of actuators and sensors is demonstrated on the active vibration of the thin-walled two dimensional mechanical systems.
Authors: Hua Peng Yu, Wen Qi Wu, Ju Liang Cao
Abstract: According to the mechanization of the Kalman filter, the processing load of implementing a Kalman filter can be different under various system propagation rates and measurement update rates. With the definitions of uniform and complete observability, uniform and complete controllability, an analytic method of evaluating the effects of various system propagation rates and measurement update rates on the azimuth error during stationary north-finding was proposed. Variance calculations and experimental tests were presented to demonstrate the applicability of the proposed analytic method and let analysts maintain good physical insight into the estimation behavior of the final azimuth error. In conclusion, the proposed analytic method will help analysts optimize system propagation rate and measurement update rate to make the computational load fall within the available processing capacity.
Authors: Bo Liu, Wei Na Hu, Jie Zhang
Abstract: This paper investigates the controllability of discrete-time multi-agent systems with leaders via switching topology. The results show that a multi-agent system can be switching controllable even if each of its subsystem is not controllable, by appropriately selecting some agents as the leaders and suitably designing the neighbor-interaction rules via a switching topology. Meanwhile, the controllability of systems can be only determined by the information from the leaders to the followers. Example and simulations are given to illustrate the theoretical results.
Authors: Qi Xin Zhu
Abstract: Feedback control systems wherein the control loops are closed through a real-time network are called networked control systems. Multi-rate networked control systems mean the sampling rates of notes in networked control systems are not the same. The controllability of multi-rate networked control systems are investigated in this paper for the first time. Based on the mathematic model of multi-rate networked control systems with short time delay, some sufficient or necessary conditions for controllability of multi-rate networked control systems are got using stochastic systems approach.
Authors: Ka Long Ringo Ng, Zai Yi Liao
Abstract: To identify potential energy savings and improvements to thermal comfort in the Canadian residential sector, a survey on occupant behaviour and control of thermal environment was conducted from April-June 2009 in low-rise dwellings in Ontario, Canada. A total of 396 completed responses were received. Survey results show that approximately 20% of the respondents were not satisfied with their room temperature in the winter. Inadequate level of controllability to room temperature is perceived as the most serious problem. Problems associated with overheating during the winter and overcooling during the summer was also identified. Observations from the survey results helped identify the deficiencies of the heating equipments built today and suggest improvements should be made to increase the controllability of current systems. Thermal simulation was then conducted to identify the problems with single-zone systems commonly built today, and to investigate the potential retrofit alternative. Simulation results show that a multi-zone system can effectively mitigate the deficiencies suffered by existing systems and can drastically improve the energy performances of houses.
Authors: Suraya Hanim Abu Bakar, Mohd Kamaruddin Abd Hamid, Sharifah Rafidah Wan Alwi, Zainuddin Abdul Manan
Abstract: This paper explains about the controllability effect on delta temperature minimum (ΔTmin) in order to get flexible and operable heat exchanger network (HEN). There are many researches based on design and cost effect to ΔTmin contribution. However, there are lacks of study on how the ΔTmin effect to controllability of HENs. Therefore, this paper focuses on controllability analysis of different HENs design based on ΔTmin contribution. There are six HEN designs were obtained from different ΔTmin values such as 20°C, 25°C, 30°C, 35°C, 40°C and 50°C and has been analyzed. The analysis consists of three different controllability tests which are feasibility, flexibility and sensitivity. Feasibility test is used to check either the HEN design is feasible or not. Next, the feasible HEN design is then analyzed in terms of flexibility. The flexibility test is used to calculate the design flexibility in terms of how much the percentage the design can handle under uncertainties. Lastly is to test the process sensitivity with respect to disturbance changes. Throughout the controllability tests, several options for control structure were built and analyzed. A simple HEN case study was used to analyze the controllability.
Authors: Xiang Hong Hu, Xiao Bing Li
Abstract: Human error controllability is analyzed based on the classic classification method of the human error in this paper. The paper also gives the comprehensive evaluation index for controllability of controllable human error. With evaluation index, Human Error control activities can be effectively guided in the production system. At last, taken the assembling process of the automobile gearbox for example, a case study is conducted. Example proves that this method can provide decision support objectively and accurately for human error control.
Authors: Cui Hua Luo, Hai Feng Qi, Cai Wen Ma
Abstract: Cooperative pointing and tracking is one important characteristic of deep space inter-satellite laser communication, so that the dynamic mathematical model is complicated nonlinearity and coupling. The contribution of this paper is to substitute the time-domain error transfer function of state equations and to linearize the state space for the sake of physical realization easily in terms of previous authors’ work. The method applied is state feedback and coordinate transformation in nonlinear field, the calculated result is demonstrated that differential equations modeled can be transferred into canonical controllable form and realized physically.
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