A new dynamical system exhibiting chaos and a torso-like set of rest points is reported in this research work. In more detail, the rest points of the new chaotic nonlinear plant are a pair of open curves of rest point...
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A novel regional path tracking description is presented in this manuscript, and the moving horizon control method that is model predictive control(MPC) is proposed to discuss the regional path tracking issue which cou...
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A novel regional path tracking description is presented in this manuscript, and the moving horizon control method that is model predictive control(MPC) is proposed to discuss the regional path tracking issue which could avoid colliding road boundary when tracking a more complex road effectively. The feasible region for autonomous ground vehicles(AGVs) running is determined first according to the detected road ***, in order to keep the actual trajectory of AGVs in the region and satisfy the safety requirements, MPC method is employed to design the path tracking controller considering actuator and road boundary *** order to verify the effectiveness of the proposed method, experiments based on Hongqi AGV HQ430 are carried out, and the results illustrate that the presented method could be successfully applied to Hongqi AGV vehicle HQ 430.
superheat degree of evaporator in heating, ventilating, and air-conditioning(HVAC) systems is a crucial variable, which not only maintains the system stability, but also impacts the system efficiency. In this study, a...
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superheat degree of evaporator in heating, ventilating, and air-conditioning(HVAC) systems is a crucial variable, which not only maintains the system stability, but also impacts the system efficiency. In this study, an iterative learning model predictive control(ILMPC) strategy for the evaporator in vapor compressor refrigeration cycle(VCC) system is *** of all, a simple model of evaporator has been presented by mechanism knowledge and system identification. Then, based on the iterative learning theory and model predictive control method,an ILMPC controller is proposed to control the superheat ***, a simulation is provided to test the effectiveness of the proposed control strategy.
Recently, several array radar structures combined with sub-Nyquist techniques and corresponding algorithms have been extensively studied. Carrier frequency and direction-of-arrival (DOA) estimations of multiple narrow...
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Aiming at the catastrophic problem of common coal mine gas explosion,this paper combines the trend surface analysis method to establish a gas explosion warning model,and validates the model through actual data,and the...
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Aiming at the catastrophic problem of common coal mine gas explosion,this paper combines the trend surface analysis method to establish a gas explosion warning model,and validates the model through actual data,and the model has good *** the data fusion of the comprehensive information of gas explosion,the gas and oxygen concentration are selected as the key indicators of the early warning model,and the trend surface analysis of the finite discrete data is *** trend surface warning model of gas and oxygen concentration is established,and the distribution of key indicators is *** that enable predictions and warnings of potential gas hazards.
We report a fiber Bragg grating（FBG）-based sensor for the simultaneous measurement of a train bearing’s vibration and temperature. A pre-stretched optical fiber with an FBG and a mass is designed for axial vibratio...
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We report a fiber Bragg grating（FBG）-based sensor for the simultaneous measurement of a train bearing’s vibration and temperature. A pre-stretched optical fiber with an FBG and a mass is designed for axial vibration sensing. Another multiplexed FBG is embedded in a selected copper-based alloy with a high thermal expansion to detect temperature. Experiments show that the sensor possesses a high resonant frequency of 970 Hz, an acceleration sensitivity of 27.28 pm/g, and a high temperature sensitivity of 35.165 pm/℃. A resonant excitation test is also carried out that demonstrates the robustness and reliability of the sensor.
In this paper, the mechanical displacement and the resulting resonance shift of the nonlinear metamaterial unit (meta-atom), due to the induced electromagnetic attraction force within the meta-atom which is placed in ...
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In this paper, the mechanical displacement and the resulting resonance shift of the nonlinear metamaterial unit (meta-atom), due to the induced electromagnetic attraction force within the meta-atom which is placed in the liquid-phase environment filled with polydimethylsiloxane (PDMS), is experimentally demonstrated with enhancement of incident electromagnetic field intensity.
A miniaturized wideband CPW-fed V-shape patch with a folded surrounding slot structure is discussed in this work. The presented antenna, fabricated on a 30 × 20 × 1.6 mm 3 FR4 dielectric, exhibits a measure...
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A miniaturized wideband CPW-fed V-shape patch with a folded surrounding slot structure is discussed in this work. The presented antenna, fabricated on a 30 × 20 × 1.6 mm 3 FR4 dielectric, exhibits a measured S 11 ≤-10 dB bandwidth from 2.39 GHz to 3.56 GHz; within this bandwidth, a gain larger than 0.6 dBi is found. Compactness and wideband characteristics yield this antenna a valid choice for Wireless LAN 2.4-2.7 GHz and Wi-MAX 2.5/3.5 GHz.
In this paper, the dynamic process of Split Resonant Rings (SRRs) muminated by electromagnetic wave with different intensities in liquid media is experimentally demonstrated for the first time, and the intrinsic energ...
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In this paper, the dynamic process of Split Resonant Rings (SRRs) muminated by electromagnetic wave with different intensities in liquid media is experimentally demonstrated for the first time, and the intrinsic energy coupling mechanism and state changing conditions are analyzed theoretically.
In this paper a new approach for the optimization of a double truncated corner microstrip square patch antenna is proposed by exploiting method-of-moments (MoM) calculator of Matlab Antenna Toolbox. A problem solution...
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In this paper a new approach for the optimization of a double truncated corner microstrip square patch antenna is proposed by exploiting method-of-moments (MoM) calculator of Matlab Antenna Toolbox. A problem solution is iteratively updated according to the optimization criteria, i.e., find the minimum axial ratio (AR) at the target frequency within the impedance bandwidth S11≤-10 dB. An update mechanism for the optimization variable domains is implemented to refine the solution step-by-step. In the proposed example it is found that this approach converges to a feasible solution in few steps (less than an hour).
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