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This paper presents the motion simulation of an autonomous underwater helicopter (AUH), a new type of underwater vehicle proposed by Zhejiang University. In order to determine whether its controllability meets the design requirements, a singularity-free unit quaternion stable control method is used for simulating the AUH performance in MATLAB, including its force and trajectory under different types...
Nowadays, research and development for optimal setting control (OSC) of complex industrial processes is becoming a hot topic. However, there is no configurable software for OSC design. In this paper, a novel software platform is proposed. The major superiority is that it not only integrates intelligent and data-driven mainstream algorithms within a unified framework, but also provides a powerful controller...
Active noise cancellation (ANC) is a method of reducing an undesired signal, i.e., noise, by introducing an “antinoise” signals from secondary sources. A fundamental issue for noise cancellation is the destiny of the excess noise power. The noise and the anti-noise sum to create at least twice the power of the original noise, and with the summed power minimized at the site of the cancellation, the...
This paper presents an integrated modelling method for submarine hovering system which equipped ballast tank to adjust vehicle position and altitude. Ballast system model including high pressure bottle and ballast tank is made first of all, and then the disturbance force considering compressibility and sea environment. Discharged coefficient of orifice is taken into account, and necessary linearity...
A new Fourier split-step parabolic equation (FSSPE) algorithm based on the variable step length technique is introduced for the numerical simulation of radio wave propagation through large irregular complex terrain. The computational efficiency of the conventional fixed range step FSSPE has been greatly improved compared with conventional fixed step FSSPE algorithm.
Reducing noise while enhancing contrast and preserving edges is one of the most fundamental operations of image processing. However, noise reduction and contrast enhancement are conflicting requests, thus it is difficult to realize these two requests at the same time. In this paper, we propose two novel models for simultaneous image denoising and contrast enhancement using partial difference equation...
In this paper, a detailed mathematical presentation of Photovoltaic (PV) generation system, as well as its simulation model based on MATLAB / Simulink is established first. Its inverter-based simplified models, i.e. the switching-function equivalent model and average model, are simulated and compared quantitatively from different aspects. Simulation results reveal that the switching-function equivalent...
In this paper, a thermal model used to determine the cell temperature of a photovoltaic (PV) module is developed. This model takes into account the ambient temperature and wind velocity to predict the performance of a PV module. The validity and utility of the proposed model are assessed by comparing the simulation result with that of the experiment. Finally, it is shown how this model can be effectively...
In the vibration environment, electronic products may have fatigue failure, which affects its reliability level seriously. Therefore, it is important to estimate the vibration fatigue life of electronic products. The common used vibration fatigue model is Steinberg model which is necessary to be studied. This paper analyzes the derivation of Steinberg vibration fatigue model. Assumptions and simplifications...
With the increasing popularity of web services on the Internet, besides functionalities, Quality of Service (QoS) is becoming an important concern for describing characteristics of web services. QoS rankings provide valuable information for making optimal service selection and recommendation from a set of functionally similar or equivalent service candidates. However, in order to obtain such rankings,...
Artificial upwelling is supposed to be a general technique to enhance the marine primary productivity and fishery resources by means of pumping the nutrient-rich deep ocean water (DOW) to the euphotic layer. The wave energy is the most conspicuous form of ocean energy, the extraction of energy from the waves can be a viable economic solution to the power requirements of artificial upwelling. To extract...
The EMT simulation for wind farms provides an alternative approach to study interaction between wind farms and power systems. To build up an EMT model of the DFIG, thoroughly considerations should be paid to the characteristics of the back-to-back PWM converter, which plays a crucial role in determining the dynamic behaviors of the DFIG. However, the detailed models of the PWM converters are so complicated...
Due to the randomness and intermittent characteristics of wind energy, the integration of wind farm may have many negative effects on the operation of the distribution networks. In this paper, a scenario-based evaluation framework is established for the theoretically analysis of influences introduced by the uncertainties of wind power integration. Then, a set of well designed evaluation indexes are...
This paper proposes a new method to extract fetal ECG from multi-channel signals. The fetal ECG is extracted in phase space, which is constructed by a pregnant woman's multiple thoracic and abdominal ECG signals. Based on corresponding points in phase space, we adopt least square algorithm to estimate the maternal components of the abdominal signals and extract the fetal signals by subtracting the...
This article models a value at risk (VaR) for financial institutions to manage the market risk of international portfolios in highly integrated global financial markets. Being different from both the Kupiec (1999) model and the Chen and Liao (2009) model for portfolios only valued in one currency, this model splits portfolios into two parts one valued in a domestic currency and the other in foreign...
By investigating the relationships among generalization performance, VC dimension and margin in SVM, this paper proposes a novel similarity margin of inner product. Then, the richness or flexibility of corresponding function class, along with estimative upper bound of relevant dimensionality, is analyzed in detail. Aiming at the demerit of difficult selection of optimal kernel function and its parameters...
This article presents precision motion control of an XY nano stage using repetitive control and double-feedforward compensation. The XY nano stage is composed of two piezoelectric actuators within a leaf spring mechanism. This study applies a repetitive controller and a Proportional-Integral-Derivative controller to achieve precision trajectory tracking. Moreover, the investigation applies a double-feedforward...
Liver diseases and liver cancer has been the top ten causes of death among ten leading causes of death in Taiwan and always in the top. Usually, in the general liver function examination, biochemical test is the most common and a test that show the most direct reflection of the body condition. The health subject can determine the further inspection according to the inspection results. Nevertheless,...
This paper simulates human visual perception with regard to visual adaptation under the change of illumination. To reflect visual adaptation in scene rendering, we adopt the mathematic models simulating photopic, scotopic, and mesopic vision. We also take consideration the characteristic that adaptation to low visibility takes longer than high visibility. As a result, the outcome of the animation...
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