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The test case generation of Cyber-Physical Systems (CPSs) face critical challenges that traditional methods such as Model-Based Testing cannot deal with. As a result, simulation-based testing is one of the most commonly used techniques for testing CPSs despite sometimes being computationally too expensive. This paper proposes a search-based approach which is implemented on top of Non-dominated Sorting...
In this investigation, a permanent magnet passively compensated pulsed alternator (PMPCPA) with ultra low mutual inductance has been designed to provide an electrical pulse with the large power for the load in the shorter period. The electric excitation is replaced by the permanent magnet excitation, the passively compensated mode is adopted, and two-phase symmetrical windings with an electric angle...
We investigate both optical and electrical properties of organic photovoltaics (OPVs) by a comprehensive multiphysics model.Using a unified finite-difference approach, the multiphysics model for OPVs is established for seamlessly connecting photon absorption to the exciton delocalization and diffusion, and to carrier transport and collection. Here we solve the Maxwell's equations and semiconductor...
Due to the advantages of low cost, easy fabrication, mechanical flexibility, the research on organic solar cells has attracted a lot of attentions in the last decades. Among countless organic materials, the most successful ones are conjugated polymers, which were widely used in bulk heterojunction (BHJ) in conjugation with the fullerene [1]. In view of the fact the interpenetratedphase-separated p-n...
This paper presents the excitation control of a high speed Switched Reluctance Generator (SRG). The single-pulse control strategy is widely adopted for high speed SRG which discretizes the generator model into a static optimization problem with excitation angles as the control variables. The conventional procedure of finding the optimal excitation angles is divided into two groups, i.e. purely equation-based...
Flight tests of prototype UAV systems can be restricted by spatial constraints and they may bring risks of damage due to failures. Motivated by these, we presented a simulation approach based on Robot Operating System (ROS) and Gazebo. Unlike other state-of-the-art quadrotor simulators, we implemented the dynamics model of the UAV in ROS to achieve high fidelity behavior of the UAV. A hierarchical...
Prognostics and health management has become a subject of great interest to many electrical systems. However, the lithium-ion batteries are a core component of many machines and critical to system's functional capabilities. Remaining useful life prediction is central to the PHM of the lithium-ion batteries. The remaining useful life of lithium-ion batteries is defined as length of time from current...
To improve the accuracy and efficiency of coal and gas outburst prediction, the principal component analysis was combined with radial basis function neural network for the prediction of the situation of coal and gas outburst in this paper. The impact factors of coal and gas outburst in a coal mine are the object of the study. Principal component analysis method was used to extract the principal component...
Based on the ship vibration motion characteristics, in this paper, it has put forward a new kind of 3 rotations and 2 translations five degrees of freedom parallel mechanism, the 4-CPS/RPS, which suites for shipboard active vibration isolation. The inverse kinematic solution of the 4-CPS/RPS is obtained, the dynamics model is established by using Lagrange method; Then the wave model and ship motion...
In this paper the fluent software was used to solve the stability of ducted fan UAV problems. The researchers calculated, programming, before and after repeated treatment and so on inputs, inefficient labor was reduced. More energy and time was considered into the nature of the problem, optimization algorithm selection and parameter setting, so the work efficiency was improved. The pneumatic parameter...
A simple digital background-calibration technique is proposed for a pipelined analog-to-digital converter (ADC). Both gain error and DAC error are measured and calibrated by injecting two uncorrelated pseudo-random sequences into the MDAC. With this method, not only small capacitors might be used, leading to small chip size, but also the traditional current starving high gain op-amps of pipelined...
Power flow transfer is one of main causes of cascading failures. It is important to evaluate power flow transfer phenomenon from the perspective of cascading failure. The authors propose a set of evaluation indexes based on the structure and operating features of the power networks and the consequence of power flow transfer. On this basis, the authors propose a comprehensive evaluation method which...
To get the transient state performance, the mathematics model of three-phase double-cage induction motors was proposed in dq0 stationary reference frame, and the actual implementation of model was explained in detail with the help of MATLAB/SIMULINK. Another, the model of power source reversal connections was established by means of MATLAB/SIMULINK. These models were applied to emulate transient process...
The paper studies sliding mode variable structure control system for a novel gearless windlass balance oil pumping unit (GWBOPU) driven by low-speed and high-torque permanent magnet synchronous motor (PMSM). By analyzing the correlative relationships of the motor and the load, a mathematics model for GWBOPU is established. Base on this model, a speed sliding mode controller is designed by regarding...
Monte Carlo Method has been proven very successful for non-linear and non-Gaussian estimation problems. However, a Monte Carlo filter usually has a lot of samples, which increase the computational load greatly. This paper presents threshold constraint into Monte Carlo. The target model is defined by the color information of the tracked object. Use the Bhattacharyya coefficient to get the similarity...
Traditional test sequence optimization methods for path testing have three problems: 1) fake test results may occur; 2) unnecessary repetitive tests may exist; 2) actual test coverage rate could be low. These problems are because the effects of the faults on the test sequence execution are not considered by traditional methods. To solve these problems, we defined a stochastic combinatorial optimization...
As online trade and interactions on the internet are on the rise, a key issue is how to use simple and effective evaluation methods to accomplish trust decision-making for customers. It is well known that subjective trust holds uncertainty like randomness and fuzziness. However, existing approaches which are commonly based on probability or fuzzy set theory can not attach enough importance to uncertainty...
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