this paper deals withthe problem of torque ripple minimization of permanent magnet synchronous motor. the novelty of the presented approach lays in precisely maintain the level of the voltage source inverter DC volta...
详细信息
ISBN:
(纸本)9789897580390
this paper deals withthe problem of torque ripple minimization of permanent magnet synchronous motor. the novelty of the presented approach lays in precisely maintain the level of the voltage source inverter DC voltage demanded for proper operation of the motor. An additional voltage matching circuit with state feedback controller is introduced in order to control of the inverter DC voltage. In the proposed solution model of a plant (i.e. permanent magnet synchronous motor fed by voltage source inverter with additional voltage matching circuit) is non-linear and non-stationary. An adaptive state feedback controller is developed by using an artificial neural network, which approximates non-linear control gain surfaces. A simple adaptation algorithm based on 2 low-order low-pass filters is used. Simulation results illustrate the proposed approach in comparison to typical drive with voltage source inverter and stationary state feedback controller.
Based on model set identification and unfalsification, robust performance measured in peak-to-peak gain is analyzed for heterogeneous platoons, inter-vehicle communication delays and actuator uncertainties. the goal i...
详细信息
In this chapter the problem of Robust Internal Model control is considered for the case of linear plants with nonlinear uncertain structure. the reference command is produced by an arbitrary reference model. A finite ...
详细信息
We present the scientific approach of the EU-FP7 SEAM4US project to the problem of sustainable energy management of underground systems, in particular the optimal and scalable control of single metro stations and thei...
详细信息
ISBN:
(纸本)9789898565716
We present the scientific approach of the EU-FP7 SEAM4US project to the problem of sustainable energy management of underground systems, in particular the optimal and scalable control of single metro stations and their surroundings that will yield at least a 5% saving in non-traction electricity consumption, equivalent to that consumed by more than 175 households. To this end we first formulate the sustainable energy management problem as a constrained optimization problem and then present a modified Newton's method as solution. Preliminary simulation results of the model-in-the-loop are delivered and promising.
Business processes define how the organizations operate, deliver products or services and interact with customers;how they support their corporate strategies and enable companies to react to changes more rapidly. Busi...
详细信息
ISBN:
(纸本)9789898565716
Business processes define how the organizations operate, deliver products or services and interact with customers;how they support their corporate strategies and enable companies to react to changes more rapidly. Business process management empowers the business analysts to define, manage, analyse and optimize their processes. the current article specifies the principles to describe the processes in a Partner Network to ensure efficient information exchange. As fluent cooperation is based on processes and depends on process maturity, the maturity estimation model is proposed in this article.
the paper challenges the current state-of-the-art which is accepted by the automotive industry. Present day vehicles are unsophisticatedly over-engineered and, as a consequence, are uneconomic, hence unsustainable. Ve...
详细信息
ISBN:
(纸本)9789898565716
the paper challenges the current state-of-the-art which is accepted by the automotive industry. Present day vehicles are unsophisticatedly over-engineered and, as a consequence, are uneconomic, hence unsustainable. Vehicles currently under development, however, offer tremendous opportunities for shifting from this position to include onboard active safety systems, e.g. collision avoidance. It is argued that future vehicles should be significantly lighter and exploit the developing safety features to the full. Indeed, such a development would reduce the existing need for crashworthiness. the above arguments coupled with parallel developments in smart materials, paves the way towards a new generation of actively controlled vehicle architecture design. Whilst the move to lighter vehicles, with onboard active safety systems and actively controlled structures, may be seen as controversial, there is a convincing case for a paradigm shift towards a truly sustainable transport future.
this paper presents designing process of the control system with discrete state feedback and neural network based load torque feedforward for permanent magnet synchronous motor fed by true sine wave 3-level neutral po...
详细信息
ISBN:
(纸本)9789898565709
this paper presents designing process of the control system with discrete state feedback and neural network based load torque feedforward for permanent magnet synchronous motor fed by true sine wave 3-level neutral point clamped inverter with an output LC filter. Our main objective is to reduce the effect of load torque changes and to improve dynamic behaviour of the motor during load changing. the full state feedback algorithm has been chosen to controlthe angular velocity of the motor and to provide true sine wave of the input motor voltages. It was found that gains of the controller and feedforward path are non-stationary and depends on the angular velocity. In such a case linearization and decoupling process of the motor with LC filter is not needed. Simulation results (at the level of 3kW) illustrate the proposed approach.
Today, the state of the art in vehicle safety follows an explicit design flow. Specific sensors measure a particular dimension (e.g. distance to other vehicles) and "safety" is defined as a specific range of...
详细信息
ISBN:
(纸本)9789898565709
Today, the state of the art in vehicle safety follows an explicit design flow. Specific sensors measure a particular dimension (e.g. distance to other vehicles) and "safety" is defined as a specific range of allowed values (e.g. minimal distance). the disadvantage of such an approach is that safety issues which were unconsidered at design time are not detectable. Furthermore, a detection of issues that are only indirectly measurable is difficult to realize. In this paper, a holistic safety monitoring approach is presented that makes use of all available sensor data and tries to find an implicit definition of "safety". By such an inverse approach vehicle safety issues which are hard to be directly measurable might be detectable, too. For instance, an identification of driver-initiated critical situations (e.g. caused by distraction) could be possible if taking multiple sensor modalities into account and having an implicitly defined "safe" state. Furthermore, the article describes the selection of potential test platforms and shows already collected test data of a mobile robot platform. Presented in this work-in-progress paper is the concept of definition, implementation, and detection of implicit vehicle safety.
the performance of modern flour mills depends crucially on value-engineering decisions involving optimal mixing of up to 80 intermediate product streams into at most 6 final product streams during continuous operation...
详细信息
ISBN:
(纸本)9789898565716
the performance of modern flour mills depends crucially on value-engineering decisions involving optimal mixing of up to 80 intermediate product streams into at most 6 final product streams during continuous operation. Optimal mixing decision depends on given physical properties and yields of intermediate streams, goals and constraints on physical properties and yields of final streams, physical and quality constraints on mixing decision variables, and qualitative judgments relating value of final streams to their physical properties. In a previous work, the authors presented an interactive tool that guided the production personnel towards an optimal decision for fractions of each intermediate stream that should be piped to each final stream. this tool could exploit multiple Linear Programming computations and graphic user-interface to enable scenario overview and manoeuvring with no perceptible time lag. However, it cannot be used in a majority of flour mills where each intermediate stream is diverted to a single final stream using physical flaps. the mixed-integer programming required in this case renders the tool too slow for interactive use. In this work, a new tool is developed for the prevalent case of discrete decision variables, which enables computations and graphic interface for scenario manoeuvring without prohibitive time lag.
the colour control system of an offset printing machine is one example, where modern information processing technologies allow an improved process control and higher resource efficiency. It is not possible to measure ...
详细信息
ISBN:
(纸本)9789898565709
the colour control system of an offset printing machine is one example, where modern information processing technologies allow an improved process control and higher resource efficiency. It is not possible to measure the printing quality during production start. So no regular closed loop control can be used. For better system behaviour a simulation model is integrated to calculate the printing quality at any time. To get an optimal process performance, a high simulation quality must be ensured, which includes a compensation of process simulation inaccuracies as well as variable influences. therefore a cognitive system is installed, which measures the most important influences like the used paper and many other process parameters. After each production the right model parameters will be calculated by identification algorithms. So a data set with influences and parameters is available. For the next production run the best-fitting parameters for the simulation model can be calculated by a Neural Network. Additionally wear and deposits, which change the machine's performance, can be compensated. the simulation accuracy and the process control quality rises, which enables a faster run-up. Savings of paper, ink, energy and time allow an economic application of this control concept.
暂无评论