期刊文献+
共找到1,851篇文章
< 1 2 93 >
每页显示 20 50 100
Identification of the Asymmetric Transmission Error and Gear Mesh Dynamic Parameters using Full-Spectrum Responses in a Geared-Rotor System
1
作者 Bhyri Rajeswara Rao Rajiv Tiwari 《Journal of Dynamics, Monitoring and Diagnostics》 2024年第2期112-142,共31页
A dominant source of vibration in geared-rotor systems is the gear mesh fault parameters.They include the asymmetric transmission error(TE),phases of TE,the gear mesh stiffness,the gear mesh damping,and the gear runou... A dominant source of vibration in geared-rotor systems is the gear mesh fault parameters.They include the asymmetric transmission error(TE),phases of TE,the gear mesh stiffness,the gear mesh damping,and the gear runouts.The present work deals with the experimental identification of the aforementioned parameters.A mathematical model of a geared-rotor system has been developed using Lagrangian dynamics.Equations of motion are transformed into the frequency domain using the full-spectrum response analysis.These transformed equations are used to develop an identification algorithm(IA)based on least-squares fit to estimate the TE and gear mesh dynamic parameters.The system IA is initially verified using numerical simulations.The robustness of the algorithm is checked by introducing white Gaussian noise in the simulated responses.A geared-rotor experimental rig was developed and used to measure responses at gear locations in two orthogonal directions.Measured responses are transformed in the frequency domain using the full-spectrum analysis and used in the present novel IA to identify the gear parameters.The identified parameters are validated by comparing the numerically generated full-spectrum response using experimentally estimated parameters and that from the experimental rig. 展开更多
关键词 Full-spectrum Geared-rotor system IDENTIFICATION Multiple faults Runouts transmission error
下载PDF
Joint resource allocation for MIMO-OFDM video transmission systems with unequal error protection 被引量:3
2
作者 张成文 刘鑫 谭学治 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2012年第2期119-124,共6页
To improve the performance of MIMO-OFDM video transmission systems on the limitation of wireless bandwidth and transmitting power,we propose an adaptive joint resource allocation algorithm with unequal error protectio... To improve the performance of MIMO-OFDM video transmission systems on the limitation of wireless bandwidth and transmitting power,we propose an adaptive joint resource allocation algorithm with unequal error protection(UEP) based on joint source-channel coding(JSCC) according to H.264 video compression standard and RCPT channel coding.According to different thresholds of the average SNR of subchannels,the algorithm dynamically allocates the source coding parameters of original video data and the channel coding parameters of RCPT,which realizes UEP for the compressed video data of different importance.Through the bit and power allocation based on MQAM modulation and the subspace allocation based on beamforming technology for different subcarriers,an adaptive joint resource allocation making full use of space-frequency domain resources have been realized.The simulation results indicate that the algorithm improves the adaptability of video transmission systems in different wireless environments and the quality of video retrieval. 展开更多
关键词 video transmission MIMO-OFDM unequal error protection joint source-channel coding
下载PDF
Excitation Prediction by Dynamic Transmission Error under Sliding Friction in Helical Gear System 被引量:1
3
作者 李文良 王黎钦 常山 《Transactions of Tianjin University》 EI CAS 2013年第6期448-453,共6页
Monte Carlo method was adopted to calculate the meshing error considering the manufacture error and assembly error of the meshing point along the time-varying contact line for helical gear pair. The flexural-torsion-a... Monte Carlo method was adopted to calculate the meshing error considering the manufacture error and assembly error of the meshing point along the time-varying contact line for helical gear pair. The flexural-torsion-axis dynamic model coupled was established under the tooth friction force and solved by the perturbation method to compute real dynamic tooth load. The change laws of the friction force and friction torque were obtained in a meshing period. The transmission error formulation was analyzed to introduce meshing excitations. The maximum dynamic transmission error, the maximum meshing force and the maximum dynamic factor were calculated under different speeds, external loads and damping factors. The conclusions can provide theoretical basis for the gear design especially in tooth profile correction. 展开更多
关键词 helical gear time-varying contact line transmission error dynamic factor
下载PDF
DESIGN OF IRREGULAR LDPC CODE WITH UNEQUAL ERROR PROTECTION PROPERTY AND ITS PERFORMANCE ANALYSIS ON IMAGE TRANSMISSION
4
作者 Wang Ruihua Yin Liuguo +1 位作者 Yu Quan Lu Jianhua 《Journal of Electronics(China)》 2005年第6期658-662,共5页
Based on the property that high degree variable nodes within an irregular LowDensity Parity-Check (LDPC) code have more powerful error-correcting capability than that of low degree variable nodes, a group of irregular... Based on the property that high degree variable nodes within an irregular LowDensity Parity-Check (LDPC) code have more powerful error-correcting capability than that of low degree variable nodes, a group of irregular LDPC codes with Unequal Error Protection (UEP)property is designed in this letter. Simulation results show that the transmission quality of the image may be effectively improved with this class of irregular LDPC code. 展开更多
关键词 Irregular Low-Density Parity-Check (LDPC) code Unequal error Protection (UEP) Image transmission
下载PDF
Design of Pinion Machine Tool-settings for Spiral Bevel Gears by Controlling Contact Path and Transmission Errors 被引量:12
5
作者 曹雪梅 方宗德 +1 位作者 许浩 苏进展 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2008年第2期179-186,共8页
This paper proposes a new approach to design pinion machine tool-settings for spiral bevel gears by controlling contact path and transmission errors. It is based on the satisfaction of contact condition of three given... This paper proposes a new approach to design pinion machine tool-settings for spiral bevel gears by controlling contact path and transmission errors. It is based on the satisfaction of contact condition of three given control points on the tooth surface. The three meshing points are controlled to be on a predesigned straight contact path that meets the pre-designed parabolic function of transmission errors. Designed separately, the magnitude of transmission errors and the orientation of the contact path are subjected to precise control. In addition, in order to meet the manufacturing requirements, we suggest to modify the values of blank offset, one of the pinion machine tool-settings, and redesign pinion ma- chine tool-settings to ensure that the magnitude and the geometry of transmission errors should not be influenced apart from minor effects on the predesigned straight contact path. The proposed approach together with its ideas has been proven by a numerical example and the manufacturing practice of a pair of spiral bevel gears. 展开更多
关键词 spiral bevel gear contact path transmission error blank offset tooth contact analysis
下载PDF
NO REVERSE ERROR BALL TRANSMISSION AND FORCE ANALYSIS ON HETERO TYPE SINGLE CYCLOID
6
作者 An Zijun Qu Zhigang ( Yanshan University) 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 1996年第1期1-5,共3页
The construction kinematics and no reverse error property of heterotype single cycloid steel ball transmission are studied and its engagement pairs structure as well as foree analysis are al- so presented. It pr... The construction kinematics and no reverse error property of heterotype single cycloid steel ball transmission are studied and its engagement pairs structure as well as foree analysis are al- so presented. It provides a kind of high property driver of large transmission ratio and compact con- struction and has theoretical and practical significance for application of the steel ball transmission. 展开更多
关键词 Heterotype cycloid Reverse error Steel ball transmission
全文增补中
Design and Analysis of the Gemini Chain System in Dual Clutch Transmission of Automobile 被引量:3
7
作者 CHENG Yabing GUO Haitao +3 位作者 FU Zhenming WAN Nen LI Lei WANG Yang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2015年第1期38-45,共8页
Chain drive system is widely used in the conditions of high-speed, overload, variable speed and load, Many studies are focused on the meshing theory and wear characteristics of chain drive system, but system design, a... Chain drive system is widely used in the conditions of high-speed, overload, variable speed and load, Many studies are focused on the meshing theory and wear characteristics of chain drive system, but system design, analysis, and noise characteristics of the chain drive system are weak. System design and noise characteristic are studied for a new type Gemini chain of dual-clutch automatic transmission. Based on the meshing theory of silent chain, the design parameters of the Gemini chain system are calculated and the mathematical models and dynamic analysis models of the Gemini chain system are established. Dynamic characteristics of the Gemini chain system is simulated and the contact force of plate and pin, plate and sprockets, the chain tension forces, the transmission error and the stress of plates and pins are analyzed. According to the simulation results of the Gemini chain system, the noise experiment about system is carried out. The noise values are tested at different speed and load and spectral characteristics are analyzed. The results of simulation and experimental show that the contact forces of plate and pin, plate and sprockets are smaller than the allowable stress values, the chain tension force is less than ultimate tension and transmission error is limited in 1.2%. The noise values can meet the requirements of industrial design, and it is proved that the design and analysis method of the Gemini chain system is scientific and feasible. The design and test system is built from analysis to test of Gemini chain system. This research presented will provide a corresponding theoretical guidance for the design and dynamic characteristics and noise characteristics of chain drive system. 展开更多
关键词 Gemini chain system design noise characteristic dynamic characteristic transmission error
下载PDF
Effect of static transmission error on dynamic responses of spiral bevel gears 被引量:4
8
作者 唐进元 胡泽华 +1 位作者 吴丽娟 陈思雨 《Journal of Central South University》 SCIE EI CAS 2013年第3期640-647,共8页
The effect of static transmission error on nonlinear dynamic response of the spiral bevel gear system combining with time-varying stiffness and backlash was investigated.Firstly,two different control equations of the ... The effect of static transmission error on nonlinear dynamic response of the spiral bevel gear system combining with time-varying stiffness and backlash was investigated.Firstly,two different control equations of the spiral bevel gear model were adopted,where the static transmission error was expressed in two patterns as predesigned parabolic function and sine function of transmission errors.The dynamic response,bifurcation map,time domain response,phase curve and Poincare map were obtained by applying the explicit Runge-Kutta integration routine with variable-step.A comparative study was carried out and some profound phenomena were detected.The results show that there are many different kinds of tooth rattling phenomena at low speed.With the increase of speed,the system enters into stable motion without any rattling in the region(0.72,1.64),which indicates that the system with predesigned parabolic function of transmission error has preferable capability at high speed. 展开更多
关键词 spiral bevel gear static transmission error dynamic response BIFURCATION
下载PDF
A novel method to predict static transmission error for spur gear pair based on accuracy grade 被引量:3
9
作者 LIU Chang SHI Wan-kai +1 位作者 Francesca Maria CURÀ Andrea MURA 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第11期3334-3349,共16页
This paper proposes a novel method to predict the spur gear pair’s static transmission error based on the accuracy grade,in which manufacturing errors(MEs),assembly errors(AEs),tooth deflections(TDs)and profile modif... This paper proposes a novel method to predict the spur gear pair’s static transmission error based on the accuracy grade,in which manufacturing errors(MEs),assembly errors(AEs),tooth deflections(TDs)and profile modifications(PMs)are considered.For the prediction,a discrete gear model for generating the error tooth profile based on the ISO accuracy grade is presented.Then,the gear model and a tooth deflection model for calculating the tooth compliance on gear meshing are coupled with the transmission error model to make the prediction by checking the interference status between gear and pinion.The prediction method is validated by comparison with the experimental results from the literature,and a set of cases are simulated to study the effects of MEs,AEs,TDs and PMs on the static transmission error.In addition,the time-varying backlash caused by both MEs and AEs,and the contact ratio under load conditions are also investigated.The results show that the novel method can effectively predict the range of the static transmission error under different accuracy grades.The prediction results can provide references for the selection of gear design parameters and the optimization of transmission performance in the design stage of gear systems. 展开更多
关键词 gear transmission error time-varying backlash prediction method accuracy grade
下载PDF
A Novel Fractional Dengue Transmission Model in the Presence of Wolbachia Using Stochastic Based Artificial Neural Network
10
作者 Zeshan Faiz Iftikhar Ahmed +1 位作者 Dumitru Baleanu Shumaila Javeed 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第5期1217-1238,共22页
The purpose of this research work is to investigate the numerical solutions of the fractional dengue transmission model(FDTM)in the presence of Wolbachia using the stochastic-based Levenberg-Marquardt neural network(L... The purpose of this research work is to investigate the numerical solutions of the fractional dengue transmission model(FDTM)in the presence of Wolbachia using the stochastic-based Levenberg-Marquardt neural network(LM-NN)technique.The fractional dengue transmission model(FDTM)consists of 12 compartments.The human population is divided into four compartments;susceptible humans(S_(h)),exposed humans(E_(h)),infectious humans(I_(h)),and recovered humans(R_(h)).Wolbachia-infected and Wolbachia-uninfected mosquito population is also divided into four compartments:aquatic(eggs,larvae,pupae),susceptible,exposed,and infectious.We investigated three different cases of vertical transmission probability(η),namely when Wolbachia-free mosquitoes persist only(η=0.6),when both types of mosquitoes persist(η=0.8),and when Wolbachia-carrying mosquitoes persist only(η=1).The objective of this study is to investigate the effectiveness of Wolbachia in reducing dengue and presenting the numerical results by using the stochastic structure LM-NN approach with 10 hidden layers of neurons for three different cases of the fractional order derivatives(α=0.4,0.6,0.8).LM-NN approach includes a training,validation,and testing procedure to minimize the mean square error(MSE)values using the reference dataset(obtained by solving the model using the Adams-Bashforth-Moulton method(ABM).The distribution of data is 80% data for training,10% for validation,and,10% for testing purpose)results.A comprehensive investigation is accessible to observe the competence,precision,capacity,and efficiency of the suggested LM-NN approach by executing the MSE,state transitions findings,and regression analysis.The effectiveness of the LM-NN approach for solving the FDTM is demonstrated by the overlap of the findings with trustworthy measures,which achieves a precision of up to 10^(-4). 展开更多
关键词 WOLBACHIA DENGUE neural network vertical transmission mean square error LEVENBERG-MARQUARDT
下载PDF
Research on Transmission Accuracy Characteristic Analysis of RV Reducer 被引量:8
11
作者 TAN Peng QI Houjun +2 位作者 HAN Lin FENG Juntao MA Dongsheng 《International Journal of Plant Engineering and Management》 2019年第3期157-168,共12页
The accuracy of RV reducer transmission is mainly affected by the transmission accuracy. Taking the high precision RV-80E reducer as the research object, aiming at its structural characteristics, the rigid-flexible co... The accuracy of RV reducer transmission is mainly affected by the transmission accuracy. Taking the high precision RV-80E reducer as the research object, aiming at its structural characteristics, the rigid-flexible coupling model of RV reducer is established by using ADAMS multi-body dynamics simulation software, and the correctness of the model is verified. At the same time, the rigid-flexible coupling model is used to design several groups of simulation prototypes with different errors, and the influence of different error factors on the transmission accuracy of the whole machine is analyzed by simulation. Finally, through different error factors, it is concluded that the error combination of positive equidistance+negative offset or negative equidistance+positive offset can effectively reduce the influence of transmission error on the transmission accuracy of the whole machine. 展开更多
关键词 RV REDUCER rigid-flexible coupling transmission error transmission ACCURACY
下载PDF
Improved FEC Code Based on Concatenated Code for Optical Transmission Systems 被引量:1
12
作者 YUAN Jian-guo JIANG Ze MAO You-ju 《Semiconductor Photonics and Technology》 CAS 2006年第3期211-216,共6页
The improved three novel schemes of the super forward error correction (super-FEC) concatenated codes are proposed after the development trend of long-haul optical transmission systems and the defects of the existin... The improved three novel schemes of the super forward error correction (super-FEC) concatenated codes are proposed after the development trend of long-haul optical transmission systems and the defects of the existing FEC codes have been analyzed. The performance simulation of the Reed-Solomon(RS)+ Bose-Chaudhuri-Hocguenghem(BCH) inner-outer serial concatenated code is implemented and the conceptions of encoding/decoding the parallel-concatenated code are presented. Furthermore, the simulation results for the RS(255,239) +RS(255,239) code and the RS(255,239) +RS(255,223) code show that the two consecutive concatenated codes are a superior coding scheme with such advantages as the better error correction, moderate redundancy and easy realization compared to the classic RS(255,239) code and other codes, and their signal to noise ratio gains are respectively 2-3 dB more than that of the RS(255,239)code at the bit error rate of 1 × 10^-13. Finally, the frame structure of the novel consecutive concatenated code is arranged to lay a firm foundation in designing its hardware. 展开更多
关键词 Optical transmission systems Super forward error correction Concatenated code Frame structure
下载PDF
Characterization of Blue-Green Light Non-Line-of-Sight Transmission in Seawater 被引量:1
13
作者 Xizheng Ke Gang Li 《Optics and Photonics Journal》 CAS 2022年第11期234-252,共19页
The blue-green light in the 450 nm to 550 nm band is usually used in underwater wireless optical communication (UWOC). The blue-green light transmission in seawater is scattered by the seawater effect and can achieve ... The blue-green light in the 450 nm to 550 nm band is usually used in underwater wireless optical communication (UWOC). The blue-green light transmission in seawater is scattered by the seawater effect and can achieve communication in non-line-of-sight (NLOS) transmission mode. Compared to line-of-sight (LOS) transmission, NLOS transmission does not require alignment and can be adapted to various underwater environments. The scattering coefficients of seawater at different depths are different, which makes the scattering of light in different depths of seawater different. In this paper, the received optical power and bit error rate (BER) of the photodetector (PD) were calculated when the scattering coefficients of blue-green light in seawater vary from large to small with increasing depth for NLOS transmission. The results show that blue-green light in different depths of seawater in the same way NLOS communication at the same distance, the received optical power and BER at the receiver are different, and the received optical power of green light is greater than that of blue light. Increasing the forward scattering coverage of the laser will suppress the received optical power of the PD, so when performing NLOS communication, appropriate trade-offs should be made between the forward scattering coverage of the laser and the received optical power. 展开更多
关键词 Underwater Wireless Optical Communication Non-Line-of-Sight transmission Scattering Coefficient Received Optical Power Bit error Rate
下载PDF
SER analysis and power allocation for hybrid cooperative transmission system 被引量:2
14
作者 Guoyan Li Youguang Zhang Wang Kang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2012年第5期661-670,共10页
The symbol-error-rate(SER) and power allocation for hybrid cooperative(HC) transmission system are investigated.Closed-form SER expression is derived by using the moment generating function(MGF)-based approach.H... The symbol-error-rate(SER) and power allocation for hybrid cooperative(HC) transmission system are investigated.Closed-form SER expression is derived by using the moment generating function(MGF)-based approach.However,the resultant SER contains an MGF of the harmonic mean of two independent random variables(RVs),which is not tractable in SER analysis.We present a simple MGF expression of the harmonic mean of two independent RVs which avoids the hypergeometric functions used commonly in previous studies.Using the simple MGF,closed-form SER for HC system with M-ary phase shift keying(M-PSK) signals is provided.Further,an approximation as well as an upper bound of the SER is presented.It is shown that the SER approximation is asymptotically tight.Based on the tight SER approximation,the power allocation of the HC system is investigated.It is shown that the optimal power allocation does not depend on the fading parameters of the source-destination(SD) channel and it only depends on the source-relay(SR) and relay-destination(RD) channels.Moreover,the performance gain of the power allocation depends on the ratio of the channel quality between RD and SR.With the increase of this ratio,more performance gain can be acquired. 展开更多
关键词 cooperative transmission relaying protocols hybrid cooperation symbol-error-rate(SER) power allocation
下载PDF
A METHOD FOR THE MEASUREMENT OF DYNAMIC TRANSMISSION ERROR OF PRECISION HOBBING MACHINES
15
作者 黄迪山 童忠钫 陆乃炎 《Journal of China Textile University(English Edition)》 EI CAS 1991年第4期59-64,共6页
In the paper,a new method for the measurement of the dynamic transmission crror of preci-sion hobbing machines using only one sensor is proposed.The dynamic transmission error i ob-tained by demodulating the phase-mod... In the paper,a new method for the measurement of the dynamic transmission crror of preci-sion hobbing machines using only one sensor is proposed.The dynamic transmission error i ob-tained by demodulating the phase-modulated signal according to the Hilbert transform priple.The results of dynamic testing show that the new method is effective. 展开更多
关键词 HILBERT TRANSFORM measurement DYNAMIC transmission error
下载PDF
A METHOD OF ANALYSIS OF MACHINE TOOL TRANSMISSION CHAIN ERROR
16
作者 宋建农 李虹 蔡康洪 《Journal of China Textile University(English Edition)》 EI CAS 1991年第2期34-42,共9页
The indexing transmission chain error of gear cutting machines is an obviously periodic timefunction. If data are acquired properly while surveying and analyzing the error with grating typeinstrument attached to a mic... The indexing transmission chain error of gear cutting machines is an obviously periodic timefunction. If data are acquired properly while surveying and analyzing the error with grating typeinstrument attached to a micro-computer, the analysis will be easier and quicker. In this paper,such a system is introduced; a data acquiring interface is designed. Therefore, real-time samplingcan be performed. The results obtained from the indexing tramsmission chain error of several gearhobbing and shaping machines with this system were satisfactory. 展开更多
关键词 DATA porcessing sampling INDEXING errorS transmission CHAIN
下载PDF
Information loss recovery for JPEG2000 image transmission in an error-prone environment
17
作者 刘洁瑜 张德运 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2008年第3期430-435,共6页
Information loss recovery techniques are important for transmitting images over error-prone channels at the decoder. A novel error recovery scheme for JPEG2000 image is presented in this paper, which adopts different ... Information loss recovery techniques are important for transmitting images over error-prone channels at the decoder. A novel error recovery scheme for JPEG2000 image is presented in this paper, which adopts different techniques for the lowest frequency coefficients and high frequency coefficients in the wavelet domain. The low-frequency recovery algorithm was implemented by adopting the watermarking technique and the packet structure of JPEG2000. The low-frequency eoefficients taken as the hidden data were extracted from the compressed bit stream, and then were embedded back into the bit stream itself prior to transmission. The embedded data were used to recover the information loss. High-frequency reconstruction was performed in bitplane base. The damaged bitplanes were recovered according to the correlation in the wavelet subband structure and by using the algorithm based on the horizontal and vertical edge detection. Experiments verified the effectiveness of these algorithms. 展开更多
关键词 JPEG2000 error recovery image transmission bitplane
下载PDF
Designing the Instrument Crank-Coupler Mechanism of Linear Output with Least Transmission Ratio Error
18
作者 裘建新 赵爱华 《Journal of Donghua University(English Edition)》 EI CAS 2004年第4期46-51,共6页
Movement accuracy is the key factor to be considered in designing precision instrument linkage and mini-linkage mechanisms. Although manufacturing errors, elastic deformation, kinematic pair clearance and friction fac... Movement accuracy is the key factor to be considered in designing precision instrument linkage and mini-linkage mechanisms. Although manufacturing errors, elastic deformation, kinematic pair clearance and friction factors all will have synthesis effect on the position accuracy of the mechanical system, the essential factor to guarantee the movement precision remains the kinematic dimensions. Combining the classical theory of mechanical synthesis with the modern error theory and the numerical method, the authors put forward a systematic and complete process and method of computer aided design for the instrument crank-coupler mechanism in which the follower takes the linear displacement approximately within a certain limited domain, with the design result of least transmission ratio error. 展开更多
关键词 crank-coupler mechanism linear displacement transmission ratio error computer aided design.
下载PDF
Study on New Concatenated Code in WDM Optical Transmission Systems
19
作者 YUAN Jian-guo JIANG Ze +1 位作者 MAO You-ju YE Wen-wei 《Semiconductor Photonics and Technology》 CAS 2007年第2期126-131,共6页
A new concatenated code of RS(255,239)+BCH(2 040,1 930) code to he suitable for WDM optical transmission systems is proposed. The simulation resuhs show that this new concatenated code. compared with the RS(255,... A new concatenated code of RS(255,239)+BCH(2 040,1 930) code to he suitable for WDM optical transmission systems is proposed. The simulation resuhs show that this new concatenated code. compared with the RS(255,239)4-CSOC(k0/n0=6/7, J= 8) code in ITU-TG. 75.1, has a lower redundancy and better error-correction performance, furthermore, its net coding gain(NCG) is respectively 0. 46 dB, 0.43 dB morethanthatofRS(255,239)+CSOC(k0/n0= 6/7, J= 8) code and BCH(3860,3824)+BCH (2 040,1 930) code in ITU TG. 75. 1 at the third iteration for the bit error rate(BER) of 10^-12. Therefore, the new super forward error correction(Super-FEC) concatenated code can be better used in ultra long-haul, ultra large-capacity and ultra high-speed WDM optical communication systems. 展开更多
关键词 concatenated code WDM optical transmission systems super forward error correction net coding gain
下载PDF
Human Errors Monitoring in Electrical Transmission Networks
20
作者 Gheorghe Grigoras Cecilia Barbulescu +1 位作者 Gheorghe Cartina Daniela Comanescu 《Journal of Energy and Power Engineering》 2012年第3期425-428,共4页
The electrical transmission networks are complex systems that are commonly run near their operational limits. Such systems can undergo major disturbances that have serious consequences. Individually, these disturbance... The electrical transmission networks are complex systems that are commonly run near their operational limits. Such systems can undergo major disturbances that have serious consequences. Individually, these disturbances can be attributed to specific causes, such as lightning strikes, ice storms, equipment failure, shorts resulting from untrimmed trees, excessive customer demand, or human errors. In the paper, the human errors from electrical transmission networks of Romanian Power Grid Company over period of 10 years are analyzed. It is hoped that obtained results will provide engineers a better understanding so they can cater to the needs of the human operators when to implement new interfaces for network monitoring tasks, not for the other technical objectives. 展开更多
关键词 Electrical transmission monitoring human errors accidental events clustering techniques.
下载PDF
上一页 1 2 93 下一页 到第
使用帮助 返回顶部