RESEARCH ON EMBEDDED SMART BEARING STRUCTURE ANALYSIS AND VIBRATION MONITORING SYSTEM DESIGN (MT) by ZHANG WenYuan, CHEN JinHai, HUA GuoRan, WANG Heng

“…According to the theoretical analysis and numerical simulation, the embedded bearing vibration monitoring system is designed by combining the vibration sensor with the bearing body. …”
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Absolute Instantaneous Optimal Control Performance Index for Active Vibration Control of Structures under Seismic Excitation by Arcan Yanik

“…It is obtained from numerical simulations that the proposed performance index is as effective as LQR in attenuating structural vibrations. …”
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Algorithm study of digital HPA predistortion using one novel memory type BP neural network by Chun-hui HUANG, Yong-jie WEN

“…Based on the characteristic analysis of the high power amplifier (HPA) in wide-band CMMB repeater stations,a novel neural network was proposed which can respectively process the memory effect and the nonlinear of power amplifier.The novel model based on real-valued time-delay neural networks(RVTDNN) uses the Levenberg-Marquardt (LM) optimization to iteratively update the coefficients of the neural network.Due to the new parameters w⁰in the novel NN model,the modified formulas of LM algorithm were provided.Next，in order to eliminate the over-fitting of LM algorithm,the Bayesian regularization algorithm was applied to the predistortion system.Additionally,the predistorter of CMMB repeater stations based on the indirect learning method was constructed to simulate the nonlinearity and memory effect of HPA.Simulation results show that both the NN models can improve system performance and reduce ACEPR (adjacent channel error power ratio ) by about 30 dB.Moreover,with the mean square error less than 10⁻⁶,the coefficient of network for FIR-NLNNN is about half of that for RVTDNN.Similarly,the times of multiplication and addition in the iterative process of FIR-NLNNN are about 25% of that for RVTDNN.…”
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Propagation of Uncertain Events in Multilevel Handlings at Container Terminals from the Perspective of Hypernetwork by Bowei Xu, Lingling Wang, Junjun Li

“…The simulation results show that the model conforms to power law distribution, and the number of old nodes has an impact on the growth of hyperedge. …”
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Tooth Surface Design and Finite Element Analysis of Circular-arc Tooth Curvilinear Cylindrical Gear by Gao Xiaowei, Jia Jie, Yan Chang, Song Xuding

“…On the basis of the meshing theory of circular-arc tooth curvilinear cylinder gear,the corresponding design method and cutting theory are studied,and the tooth surface forming principle is analyzed.By using a double-sided cutter generating method and taking the cutting cone tooth surface which formed by cutter blade rotating as the imaginary tooth surface,the meshing process of the circular-arc tooth curvilinear cylindrical gear is simulated,the tooth surface equation is derived,the tooth surface numerical simulation is carried out and the visualization is realized.Then,the finite element mesh model is imported into ABAQUS software to carry out the finite element analysis,the contrastive analysis between the finite element analysis result and Hertz contact theory is carried out,and the result shows that built finite element model is reasonable.Through the comparison between the analysis results and the cylindrical gear with the same size,the result shows that the contact strength of circular-arc tooth curvilinear cylindrical gear is better than spur involute cylindrical gear.Beside,through the comparison analysis of the three groups size calculation examples of cutter radius,the relation between the cutter radius size and stress size is obtained.…”
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A High Selectivity, Miniaturized, Low Profile Dual-Band Bandpass FSS with a Controllable Transmission Zero by Wenxing Li, Yuanyuan Li

“…The prototype of this FSS is simulated, fabricated, and measured, and its theoretical analysis, simulation, and measurement results show a good agreement. …”
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Circularly Polarized Leaky-Wave Antenna Based on Low-Loss Transmission Line by Xingying Huo, Zheng Li

“…The simulated maximum directivity is l5.5 dBi with efficiency over 90% during the whole band.…”
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Reinforcement learning-based channel access mechanism for multi-base station slotted Aloha with cooperative reception by HUANG Yuankang, ZHAN Wen, SUN Xinghua

“…Simulations confirm that the fairness-optimized algorithm significantly enhances network fairness while preserving satisfactory network throughput performance.…”
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Quasi-Dimensional Modelling and Parametric Studies of a Heavy-Duty HCCI Engine by Sunil Kumar Pandey, Muralitharan N., Ravikrishna R. V.

“…Results from the HCCI mode simulations show good potential when compared to conventional diesel performance with respect to important performance parameters such as peak firing pressure, specific fuel consumption, peak pressure rise, and combustion noise. …”
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Study on the Speed Stability of Wheel Drive Mechanism used in Lunar Rover by Xiao Jie, Zeng Lingbin, Zhang Xiaowei, Liu Dianfu, Zou Huaiwu

“…The 3-stage planetary reducer with closed-loop control is adopted in CE-3 lunar rover wheel drive mechanism.Aiming at the problem that the speed stability of drive mechanism does not satisfy the design requirements,the factors affecting the speed stability of planetary reducer are systematically analyzed,and methods and measures minimizing the inequality of load sharing of planetary gear sets are studied carefully.Through troubleshooting and numerical simulations,the causation is uncovered as follows:the first stage sun gear radial runout exceeds the allowed range.Then two solutions are proposed:the first one is to redesign the first stage sun gear into a floating sun gear,the second one is to improve the machining precision of the first stage sun gear.And the second solution is adopted because it is smaller and lighter than the first one.Then much ground simulation tests which are conducted at the room condition,high-temperature vacuum condition and low-temperature vacuum condition demonstrate that the speed stability of drive mechanism satisfies the design requirements.At last,the effectiveness of the proposed method is validated by the telemetry parameters of lunar rover moving on the moon surface.…”
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Hybrid access control algorithm based on relay node assistant in Femtocell network by Cheng-yi LIU, Geng CHEN, Song XING, Lian-feng SHEN

“…A Femtocell hybrid access control algorithm assisted with relay note was proposed to supply higher performance for the Femtocell neighboring users (NUE) in heterogeneous network.Deploying relay outside the Femtocell networks was used and amplify-and-forward (AF) relaying protocol or direct link protocol was alternated to use for the data transmission of Femtocell NUE.An optimization problem was formulated with the constraints of the required transmission rates thresholds of Femtocell registered users (FUE),the thresholds of the cross-tier interferences to the macrocell users (MUE),and total transmit powers of the Femtocell base station (FBS).By using the dual decomposition method,a Femtocell hybrid access control algorithm was given based on the combination of the direct mode and relay mode.Simulation results have shown that the scheme can not only protect the QoS required by the FUE,but also decrease the cross-tier interferences suffered by the MUE.It also illustrates the better performance of the NUE through the dynamic and flexible access mechanism.Furthermore,based on the last simulation the relay link would help the NUE obtain about 25% more performance than the traditional direct link in some regions.…”
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Low-Vacuum Quadrupole Mass Filter Using a Drift Gas by Peihe Jiang, Zhanfeng Zhao

“…The simulation results showed that this method effectively solves these problems, and the obtained spectral peak was superior to that without drift gas flow regarding spectral peak intensity and width. …”
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Fuzzy-Based Adaptive Countering Method against False Endorsement Insertion Attacks in Wireless Sensor Networks by Hae Young Lee

“…The improved performance with this method is demonstrated by simulation results.…”
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Recognition algorithm of non punctured polarization codes based on structural characteristics of coding matrix by Yao WANG, Xiang WANG, Guodong YANG, Zhitao HUANG

“…In order to solve the problems of complexity and poor error adaptability in the blind recognition of standard non-punctured polarization codes, the theorems and propositions that could characterize the relationship between the code length and code rate, and distinguish information subchannel and frozen subchannel were proved.Based on the theorem and proposition, an efficient blind recognition algorithm was proposed.The proposed algorithm only needed to set the possible maximum code length, and the corresponding soft decision codewords matrixes and Kronecker matrixes were constructed.Based on the theorem and proposition proved, the check relationship between the two matrices was judged and the code rate and frozen bit position were estimated.The average likelihood difference was introduced as the test quantity, and the decision threshold was determined based on its theoretical probability distribution and minimax criterion.The simulation results show that the deduced theorem and propositions are consistent with the simulation results.Under the signal-to-noise ratio of 6 dB and code length of 1 024, the parameter recognition rate is still close to 100%.The recognition performance and computational complexity are better than the existing soft decision algorithms.…”
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Spatiotemporal Dynamics of a Reaction Diffusive Predator-Prey Model: A Weak Nonlinear Analysis by N. B. Sharmila, C. Gunasundari, Mohammad Sajid

“…A novel sinc interpolation approach is introduced. Numerical simulations elucidate the interplay between diffusion and Turing parameters. …”
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Surface Albedo Assimilation and Its Impact on Surface Radiation Budget in Beijing by Chunlei Meng

“…As bias exists between the model simulated and observed surface albedo, data assimilation is an important method to improve the simulation results. …”
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Opportunistic routing algorithm based on trust model for ad hoc network by Bo WANG, Xun-xun CHEN

“…Due to the absence of enough physical protection,dynamic topology,distributed collaboration,the limited bandwidth and computing ability in ad hoc network,traditional routing security mechanism cannot adapt to the design of routing protocols.Recently,opportunistic routing is of the research hotspots,which can cope with the unreliable transmissions to improve throughput of the whole network by exploiting the broadcast nature of the wireless medium and spatial diversity of multi-hop wireless network.The concept of trust-based similarity in opportunistic routing for ad hoc network was incorporated,and a novel trusted opportunistic forwarding model based on trust degree of node and least cost of opportunistic routing were also built.Then a trusted minimum cost routing algorithm (MCOR) was proposed and the correctness and effectiveness of this algorithm from theoretical ana ysis were proved.Finally,MCOR algorithm was verified by simulation and was compared with the classic protocols:ExOR,TAODV and Watchdog-DSR.The simulation results show that MCOR scheme can detect and mitigate node misbehaviors.Furthermore,MCOR scheme outperforms the other protocols in terms of throughput,delay,expected ETX and cost of routing.…”
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LIGHTWEIGHT REALIZATION METHOD FOR WHEEL-SIDE REDUCER BASED ON HIGH DURABILITY LEVEL by ZHENG SongLin, HUANG ChongWen, FENG JinZhi, HUA FeiFei

“…Finally,the optimized shell’s fatigue life was predicted by applying virtual fatigue simulation method. The simulation results showed that the shell was furthest light-weight designed on the basis of satisfying specified durability test requirement.…”
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Analysis and Design of an Energy Efficient Differential Coherent Chaos Based System in Additive White Gaussian Noise Environment by Nizar Al Bassam, Oday D. Jerew

“…The bit error rate (BER) performance of the proposed scheme is evaluated analytically using Gaussian Approximation (GA) method and compared with the simulation results. The results show excellent agreement between the derived expression and simulation. …”
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Network traffic prediction based on FARIMA-GARCH model by Shuang-mao YANG, Wei GUO, Wei TANG

“…Compared with the traditional me-thod, the limited search method reduces the evaluated error despite a slight computational cost. Then simulation was car-ried out to verify the accuracy of proposed algorithm with real network traffic. …”
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