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This paper proposes an instantaneous power control method for high speed permanent magnet synchronous generators (PMSG), to realize the decoupled control of active power and reactive power, through vector control based on a sliding mode observer (SMO), and a phase locked loop (PLL). Consequently, the high speed PMSG has a high internal power factor, to ensure efficient operation. Vector control and...
It is necessary to implement intelligent manufacturing for urban rail vehicle manufacturing enterprises in order to improve efficiency and reduce costs, so as to improve market competitiveness. As an important part of intelligent manufacturing, intelligent material distribution system must be studied. Firstly, this paper analyzes the problems existing in material distribution for urban rail vehicle...
This paper proposes a supervisory optimal control structure for the micro-gas-turbine based combined cooling heating and power (MGT-CCHP) system. In the upper layer of the structure, a dynamic optimal reference governor is developed to calculate the optimal operating points according to the given economic performance indexes, and in the lower layer of the structure, model predictive control is utilized...
Firstly, this paper introduces lean production, intelligent manufacturing and the relationship between the two, presents the lean intelligent manufacturing model, illustrates the importance of process optimization in this manufacturing mode. Then, it analyzes the problems existing in urban rail vehicle assembly, points out that the urban rail vehicle assembly is far away from the industry 4.0. In...
This paper proposes a single-shot approach for recognising clothing categories from 2.5D features. We propose two visual features, BSP (B-Spline Patch) and TSD (Topology Spatial Distances) for this task. The local BSP features are encoded by LLC (Locality-constrained Linear Coding) and fused with three different global features. Our visual feature is robust to deformable shapes and our approach is...
In this paper, an ultra-thin polarization-independent wideband metamaterial absorber (MA) is proposed. The unit cell of this MA is composed by a branch-like pattern with four patch-resistors, FR4 substrate and metallic plate, which can delicately combine dielectric loss and ohmic loss. The electromagnetic performances of the MA are studied by full-wave simulations based on finite-element method. The...
Super capacitor energy storage system(SCESS) with high power, long life, wide operating temperature range, is widely used in industrial applications. The balancing system is needed to ensure the operation safety of the SCESS. In this paper, the balancing system based on active clamped forward converter is designed. The active clamped forward converter is based on synchronous rectifier technology with...
A method of voltage detection specific to single-phase dynamic voltage restorer based on double closed-loops of proportional-resonant controllers is proposed for the fundamental wave extraction. The circuit topology and control strategy of dynamic voltage restorer are established to provide the basics for the design of voltage detection. To ensure the dynamic voltage compensation performance of digital...
Super-capacitor with the features of high power density and long life is used as a new kind of energy storage methods for electric bus. State of charge (SOC) indicates the remaining power, which is very important for super-capacitor bus. In this paper, a SOC estimate method based on sliding mode observer is studied. The design of sliding mode observer is based on the “two-branch” equivalent circuit...
With the rapid development of rail transit, urban rail transit network is increasingly becoming complex due to the intersection of the different operating lines. In order to guarantee the convenience of passenger's travel, most domestic the existing metro system passengers' records are only retrieved at entry and exit points. With such a system, it is difficult to track the passengers' complete path...
In this paper, Maclaurin expansion and Padé approximation are utilized to handle the RHP zeros in the simplified decoupling control and the choosing strategy is given. To improve the robustness of each loop, Active Disturbance Rejection Control (ADRC) is adopted as a good solution which can estimate and compensate the total disturbances by the extended state observer (ESO). Besides, the stability...
Furnace pressure control is one of the most significant loop in thermal power plant. The stable pressure in furnace guarantees the safety and efficiency of combustion. The frequent disturbances in combustion and multi-loop coupling make it difficult to continuously maintain an anticipated furnace pressure. This paper applied low-order Active Disturbance Rejection Control (ADRC) to furnace pressure...
This paper addresses the problem of simultaneous 3D reconstruction and material recognition and segmentation. Enabling robots to recognise different materials (concrete, metal etc.) in a scene is important for many tasks, e.g. robotic interventions in nuclear decommissioning. Previous work on 3D semantic reconstruction has predominantly focused on recognition of everyday domestic objects (tables,...
To guarantee secure communication of the primary system and efficiently utilize the licensed spectrum, in this paper, we propose a two-path successive relaying and jamming based cooperative transmission (TSRJC) scheme. In TSRJC scheme, two secondary users (SU) successively relay the primary message and jam the primary eavesdropper to confirm secure and reliable transmission of the primary system during...
Eavesdropping in wireless communication environment should be suppressed. However, most existing schemes ordinarily focus on secrecy rate enhancement, which may not be achieved with the non-Gaussian signals. Therefore, we consider this security problem from the actual signal point of view. On the basis of this premise, a novel scheme is proposed. In our scheme, each original signal in one constellation...
Conventional methods of codebook design in limited-feedback multi-antenna systems aim to quantize the single-user channel but without considering secrecy requirements. Thus, the information leakage is inevitably aggravated due to the eavesdropping behaviors in limited-feedback multiple-input single-output single-antenna- eavesdropper (MISOSE) systems. To reduce the information leakage without any...
How do firms leverage existing innovation for the next round of innovation? We develop a novel concept of generative capability in product innovation to address this question. As a high-level organizational routine, generative capability applies the mechanisms of iteration and rapid knowledge integration to guide ordinary innovation activities. Based on panel data from 2001 to 2009 of 56,333 firm-year...
Can venture capital (VC) firms transform a weak innovation ecosystem into a productive and robust one? While the literature has found VC firms' catalyst role in innovation in developed markets, we know little about whether and how they affect innovation in an emerging market, where formal legal- and market institutions and networks of professional intermediaries for them to play a catalyst role are...
Pilot spoofing attack is a serious threat to timedivision duplex (TDD) orthogonal frequency division multiplexing (TDD-OFDM) system. By employing identical pilot tones as a legitimate receiver, an adversary can contaminate the uplink channel estimation between a transceiver pair. To solve this problem, we in this paper propose an independent component analysis (ICA) based channel estimation and identification...
Non-orthogonal multiple access (NOMA) is an important multiple access mode in 5G. Nevertheless, eavesdropping may appear between the users in NOMA. In this case, physical layer security schemes can be introduced to combat eavesdropping. Different from the existing schemes, eavesdropping suppression in NOMA should be based on several rules: (i) successive interference cancellation (SIC) should be normally...
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