Performance Evaluation Brushless DC Motor System With Variable Loads
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The use of brushless DC motors will increase with the transition of conventional vehicle motors to electric vehicles (Electric Vehicles). The purpose of this study is to produce control that can maintain and increase the stability of motor rotation at changing or non-linear loads. It then performs testing of the created model. The control method used is PID. The control that is suitable for use in cases like this is the PID (Proportional Integral Derivative) control system. The best K Keywords:
Derivative (finance)
Currently,the implementation of Web caching is mostly based on traditional cache updating algorithms.However,due to the diversity of the Web traffic pattern,the traditional algorithms for cache updating can not be used in Web environment effectively.This paper studied the basis of Web caching replacement operations,and analyzed the deficiency of previous replacement algorithm.As the size,the access cost,the access frequency and the recently visiting time of Web document affect caching replacement,proposed the concept of Web caching objects roles.Created a new high accuracy Web caching replacement algorithm(ORB algorithm) based on objects roles.In case of NASA and DES proxy server data is used for example,and compared the algorithm with LRU,LFU,SIZE,Hybrid algorithms.The result shows that ORB algorithm has better performance than the others.
Orb (optics)
Proxy server
Smart Cache
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The derivative in the algorithm PID can reduce the overshoot.This paper presents a new algorithm to improve the derivative action.The paper also explains the idea of the modified algorithm,and presents the result of comparing with the traditional PID algorithm.
Overshoot (microwave communication)
Derivative (finance)
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Generally, a PID controller is not suitable to control a multi variable system because it is very difficult to tune their gains. However, this paper shows that it is not hard to tune the PID gains if we can find a Jacobian matrix of the system. Because the Jacobian matrix expresses the ratio of output variations according to input variations, it is possible to adjust the input values in order to reduce the output error. If the cost function is composed of error related terms, the gradient approach can tune the PID gains to minimize the function. In simulation, a hydrofoil catamaran with two inputs and two outputs is considered as a multi variable system. We can easily obtain the multi variable PID controller by the proposed tuning method. When it was compared with a LQR controller with a modelling equation, its performance was very good.
Matrix (chemical analysis)
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Buffer (optical fiber)
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There are two similar PID algorithms,one is PID algorithm of integral separation,the othe is PID algorithm of alteration in rate,they're easily mixed.A particular comparation was made on the two algorithms' application condition and realization way,according to the digital simulation of control system based on MATLAB,their control effects are calculated and analysed,some useful conclusions are received.
Realization (probability)
Separation (statistics)
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Neural Machine Translation (NMT) model has become the mainstream technology in machine translation. The supervised neural machine translation model trains with abundant of sentence-level parallel corpora. But for low-resources language or dialect with no such corpus available, it is difficult to achieve good performance. Researchers began to focus on unsupervised neural machine translation (UNMT) that monolingual corpus as training data. UNMT need to construct the language model (LM) which learns semantic information from the monolingual corpus. This paper focuses on the pre-training of LM in unsupervised machine translation and proposes a pre-training method, NER-MLM (named entity recognition masked language model). Through performing NER, the proposed method can obtain better semantic information and language model parameters with better training results. In the unsupervised machine translation task, the BLEU scores on the WMT’16 English–French, English–German, data sets are 35.30, 27.30 respectively. To the best of our knowledge, this is the highest results in the field of UNMT reported so far.
Named Entity Recognition
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This chapter contains sections titled: Control Equation Incorporating Derivative into the Control Equation PID Control Equations Effect of Derivative Time Getting the Most from Derivative PID Control of Simple Models Tuning Summary
Derivative (finance)
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Destage algorithms play an important role in improving IO performance in cached RAID5 systems.In this paper,the authors study a number of existing destage algorithms,and propose a destage-efficiency-first(DEF) algorithm based on the classification of system status for RAID5 systems.The main idea of this algorithm is that destage strategy will be dynamically adjusted on the principle of detage efficiency according to the current cache occupancy level and varying workload.In addition,the authors present the key technology in implementing the DEF algorithm,and test and analyse the performance of the algorithm.
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This paper presents mainly the algorithms used in a video format conversion SoC, including weighted sum motion-adaptive de-interlacing algorithms, multi-level pipelined filtering algorithm used in scaling and DDA algorithm. These algorithms take hardware implementation ability and resource utilization rate into consideration, thus satisfy requirements of the format conversion SoC. In the end, system level simulation result is given.
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In this paper tuning algorithm of variable fractional PID controller for switching objective function is presented. The time constant parameters of PID controller are obtained by well-known, traditional Ziegler-Nichols methods. Then, the orders of integral and derivative actions are obtained based on minimization for different objective functions separately. This objective function can be switched during control process by changing orders of fractional PID controller. It leads to variable fractional order PID controller which can be implemented differently, according to above definitions. The paper presents also numerical results of applying proposed method to the control system. Then, obtained results for different type of variable order differences are compared and analysed.
Constant (computer programming)
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