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RF technology is widely used in many fields. This study is based on the knowledge of RF circuit. It is aimed to design a wireless communication transceiver, which includes transmitter circuit, receiver circuit and communication antenna. In design process, we do not only consider the transmitter circuit and the receiver circuit indicators to meet the requirements of the module, but also ensure that...
With the development of the size of the ships, the power and size parameters of propulsion increase apparently, which leads the problems caused by dynamic excitations, such as hull deformation and stern excitations, are increasingly prominent. Based on the characteristics of dynamic excitations for the ship propulsion system in navigation, a reasonable experiment plan is designed, considering the...
With the continuous expansion of flight envelope about aero-engine, the control range and accuracy of the fuel are increasing. However, the traditional way is difficult to take into account the fuel metering accuracy and response rate, it is necessary for the fuel metering device to have a further study. Through the study of the dual variable control about fuel flow area and pressure-drop, a higher...
Recent years have witnessed an explosion of gamecasting applications in the market, in which game players (or gamers in short) broadcast their game scenes in real-time. Such pioneer applications as YouTube Gaming, Twitch, and Mobcrush have attracted a massive number of online broadcasters, and each of them can attract hundreds or thousands of fellow viewers. The growing number however has created...
In this paper, we study the power allocation and power splitting problem for simultaneous wireless information and power transfer (SWIPT) in a multi-user MISO broadcast system, in which there are two types of single-antenna users: traditional users that only receive information and modern users that receive information and energy simultaneously from a multi-antenna base station via power splitting...
According to the characteristics of high flexibility, high frequency of fault and difficult to detect real-time of the UAV, fault classification model by the Back Propagation neural network based on wavelet entropy and adaptive fireworks algorithm has been proposed. The fault signal can be analyzed locally with wavelet packet entropy, then extract the feature vector, which is used to express the feature...
This paper presents a fault-tolerant (FT) switching control system structure and proposes an FT controller design methodology for systems vulnerable to actuator and sensor faults. The working effectiveness of the i-th actuator/sensor (which is assumed to be known) is represented as a time varying parameter δi(t) where δi(t) ∈ {0, c2, …, cs−1, 1} and where δi(t) = 0 represents a component failure at...
Compliant actuator is widely accepted for physical human-robot interaction due to its safety aspect, dynamic performance improvements and energy saving abilities. In this paper, based on the variable ratio lever mechanism, a new kind of Serial Variable Stiffness Actuator (SVSA) is proposed by using an Archimedean Spiral Relocation Mechanism (ASRM) to change the position of the pivot, implementing...
This paper studies the shortcomings of manual detection methods for vehicle emission test workshop detection, such as low accuracy rate, high costs and difficulties in achieving real-time judgment, a workshop detection and algorithm based on video surveillance is proposed. According to the intrusion probability, the video image is divided into squares, and different square has different sensitivity...
Unmanned Aerial Vehicle has a high complexity and nonlinear control system, the sensor is the important device to provide flight data for system, so it's performance is the major determinant of Unmanned Aerial Vehicle. The sensor generally damaged suddenly and lack of many fault data samples. So specific to this reason, this paper uses wavelet packet to extract fault energy feature, and designs a...
First of all, from the aspect of key component in the Windows kernel, using the related tools of operating system kernel, to analyze and debug each kernel component by combining with the verification procedures, and objects of individual component in executable level is analyzed deeply, to be familiar with the internal principles of each executable component, and learn to use the kernel debugger,...
To evaluate the aging condition of 110kV XLPE cables accurately, this paper employs the isothermal relaxation current (IRC) method and the activation energy (AE) method, discussing the relationship among the aging factor, the activation energy and the aging condition of cable insulation. The results show that compared with unaged cables, the cables under accelerated thermal aging have 0.348 more on...
Interconnection and coupling between electric power, heating and natural gas systems are becoming closer and closer. From the point of view of coordinated optimization, through the establishment of mathematical model of district electricity and heating system, a coordinated optimization model of district electricity and heating system based on genetic algorithm is constructed in this paper. A typical...
Reactive power optimization is generally used to design an optimal profile of voltage and reactive power of power systems in steady state for deterministic sets of demand load and generation values, and it is a significant procedure in voltage control. However, the input data of power system is actually uncertain in practice, which makes reactive power optimization an uncertain nonlinear programming,...
A rectangular interval power flow (RIPF) method is proposed to evaluate solutions' intervals of power flow including uncertain loads and output of generators. It is based on affine arithmetic which is a more accurate method to compute intervals, and it obtains intervals through optimization methods to enhance efficiency of interval calculation. Because no approximation is used, RIPF can acquire narrower...
In this paper, we comparative analysis the performance of DFT-based interpolation algorithm with different windows and Digital Lock-in amplifier(DLA) method. We recommend that DLA is a good choice for low signal to noise ratio (SNR). DFT-based interpolation can work with unknown frequency. In comparison with rectangle window, triangle window has better side-band affection with accuracy lose. Beside,...
In today's mobile devices, the battery reservoir remains severely limited in capacity, making power consumption a key concern in the design and implementation of mobile applications. In this paper, we closely examine one widely adopted approach to improve the energy efficiency of mobile applications-adaptively offloading the computation to the remote cloud. In particular, we measure the power consumption...
There has been significant interest in the use of HTTP adaptive streaming for live or on-demand video over the Internet in recent years. To mitigate the streaming transmission delay and reduce the networking overhead, an effective and critical approach is to utilize cache servers between the origin servers and the heterogeneous clients. As the underlying protocol for web transactions, HTTP has great...
A fault-tolerant switching observer design methodology is proposed. The aim is to maintain a desired level of closed-loop performance under a range of sensor fault scenarios while the fault-free nominal performance is optimized. The range of considered fault scenarios is determined by a minimum number p of assumed working sensors. Thus the smaller p is, the more fault tolerant is the observer. This...
This paper proposes the design of a new compact, low power consumption, portable K-band FMCW radar for short distance ranging applications from composition, choice, and design of system. This new system uses triangle wave modulation mode, the tuning bandwidth is 300MHz (24.0GHz–24.3GHz), the modulation period is 2ms. With external low-noise amplifier and power amplifier, its measuring distance up...
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