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Numerical simulation of thermodynamics coupling in hot forming process of elliptical head used in power station 认领 引用 被引量：1
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作者 侯珍秀 郄宁宁 +2 位作者 蕫恺琛 周志伟 胡兴鸿 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2012年第1期23-28,共6页
To reduce the time of getting an ideal elliptical heat used in power station through repairing and testing a die repeatedly according to experience,finite element software Deform-3D was used to research the simulation... To reduce the time of getting an ideal elliptical heat used in power station through repairing and testing a die repeatedly according to experience,finite element software Deform-3D was used to research the simulation of deformation-heat transfer coupling in hot forming process of elliptical head with the size of Φ1200 mm ×100 mm. The variations of stress,stain,temperature,thickness and strain rate in forming process were gotten,and the forming quality was evaluated from roundness,thinning rate and thermal contraction. The results show that the maximum thinning rate of the elliptical head is 7. 31% ,it is close to the orthographic place; and the inner diam- eter obtained from simulation is 1200. 6 - 1202. 977 mm,it is in the range of inner diameter tolerance required; all the data fit well with the practical dimension data of processing head. 展开更多
关键词 elliptical head deformation-heat transfer coupling numerical simulation strain rate thinning rate
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Research on constitutive equation of DIWA353 steel used in hemisphere head of power station nearby recrystallization temperature 认领 引用 被引量：1
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作者 侯珍秀 王新庆 +3 位作者 董恺琛 李世魁 蔡多谋 李晓红 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2011年第6期39-43,共5页
To simulate the DIWA353 steel used in boiler nearby recrystallization temperature accurately by using finite element,the high temperature constitutive model of this material must be researched firstly.Thermal simulati... To simulate the DIWA353 steel used in boiler nearby recrystallization temperature accurately by using finite element,the high temperature constitutive model of this material must be researched firstly.Thermal simulation experimental machine is used to do the high temperature hot compression experiments for the DIWA353 steel used in boiler under different strain rates and temperatures nearby recrystallization temperature.Multi-bank data of true stress-true strain is gotten,and the hot deformation activation energy of DIWA353 is obtained,and the constitutive equation of steady-state flow stress under the circumstance of high temperature is constructed.The results show that DIWA353 steel is positive strain rate sensitized material when it is at temperature of 850-1050 ℃,and the steady-state flow stress decreases with the increase of deformation temperature,but increases with the increase of strain rate. 展开更多
关键词 5oiler head recrystallization temperature constitutive equation numerical simulation strain rate
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Effect of processing parameters on bulge-forming Polycarbonate parts 认领 引用 被引量：1
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作者 侯珍秀 吴菁 +2 位作者 刘智 李晓东 王仲仁 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2007年第1期54-58,共5页
According to the data of the experiment made in mechanical tensile of Polycarbonate in high temperature, experiments were done to polycarbonate sheet by hot gas pressure bulge-forming. It was found that selecting and ... According to the data of the experiment made in mechanical tensile of Polycarbonate in high temperature, experiments were done to polycarbonate sheet by hot gas pressure bulge-forming. It was found that selecting and combination of the processing parameters were vital to the quality. In the experiments and numerical simulation with the software of DYNAFORM, the processing parameters have been studied.The results showed that the method of discontinuous pressure and pressure preservation advantage the forming; when temperature and pressure meet the forming conditions, the longer time of pressure preservation promotes sufficient forming. 展开更多
关键词 orocessing parameter hot gas pressure bulge-forming PC sheet parts quality
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Design of operation parameters of a high speed TDI CCD line scan camera 认领 引用 被引量：2
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作者 陈晓丽 冯勇 梁大强 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2006年第6期683-687,共5页
This paper analyzes the operation parameters of the time delay and integration (TDI) line scan CCD camera, such as resolution, line rate, clock frequency, etc. and their mathematical relationship is deduced. By analyz... This paper analyzes the operation parameters of the time delay and integration (TDI) line scan CCD camera, such as resolution, line rate, clock frequency, etc. and their mathematical relationship is deduced. By analyzing and calculating these parameters, the working clocks of the TDI CCD line scan camera are designed, which guarantees the synchronization of the line scan rate and the camera movement speed. The IL-E2 TDI CCD of DALSA Co. is used as the sensor of the camera in the paper. The working clock generator used for the TDI CCD sensor is realized by using the programmable logic device (PLD). The experimental results show that the working clock generator circuit satisfies the requirement of high speed TDI CCD line scan camera. 展开更多
关键词 line scan CCD time delay and integration （TDI） programmable logic device （PLD）
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Study of direct back EMF detection for sensorless brushless DC motor 认领 引用 被引量：1
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作者 邹继斌 江善林 梁维燕 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2010年第4期461-466,共6页
In this paper,a new rotor position detecting method for the sensorless control of brushless DC motor ( BLDCM) is introduced. It obtains the phase back EMF signal from the motor terminal voltage by properly choosing th... In this paper,a new rotor position detecting method for the sensorless control of brushless DC motor ( BLDCM) is introduced. It obtains the phase back EMF signal from the motor terminal voltage by properly choosing the PWM and sensing strategy directly and needn't the motor neutral point voltage information. The paper analyzes both the steady-state of PWM on the high side modulator mode which doesn't consider the parasitic capacitance Coes in the switches and the transient-state of PWM on the high side modulator mode which considers the parasitic capacitance Coes in the switches in detail. The experimental results verify that the proposed method is not sensitive to switching noise,no filtering is required,and good motor performance is achieved within a wide speed range. 展开更多
关键词 BLDCM sensorless Back EMF PWM
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Implementation strategy for soft switching PFC with low output voltage 认领 引用 被引量：1
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作者 贲洪奇 原树斌 王大庆 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2006年第6期644-648,共5页
This paper proposes a novel implementation strategy for soft switching PFC whose circuit is simple and can achieve low voltage output directly. The main circuit adopts current mode full-bridge converter and all the po... This paper proposes a novel implementation strategy for soft switching PFC whose circuit is simple and can achieve low voltage output directly. The main circuit adopts current mode full-bridge converter and all the power switches can realize ZCS or ZVS in the way of phase-shlfted control, using the leakage inductance of the transformer, the junction capacitor of the switches and the stored energy of the output capacitor. The problems such as the function of phase-shlfted link in control circuit, the implementation conditions of soft switching and bias restrained are analyzed. The adoption of constant frequency PWM control makes the design of the input and output filter link and the high frequency transformer simple. The transformation ratio regulation so as to achieve low voltage output and electrical insulation can be realized by using high frequency transformer. 展开更多
关键词 power factor correction soft switching full-bridge low voltage
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Delay Analysis and Formulation Inference of Signalized Intersection for Traffic Congestion Conditions 认领 引用 被引量：1
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作者 刘广萍 丁建梅 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2004年第2期160-163,共4页
Vehicle delay is an important measure to evaluate the signal timings of signalized intersections.When optimization the signal control parameters, delays of vehicles from all approach directions of an intersection shou... Vehicle delay is an important measure to evaluate the signal timings of signalized intersections.When optimization the signal control parameters, delays of vehicles from all approach directions of an intersection should be considered. Based on the analysis of the vehicle delay on an approach of intersection, directed against the typical condition of a congested intersection-over-saturated condition, the paper has analyzed and inferred the intersection delay dynamic formulation, and has established the relation between intersection delay,the signal timings, vehicle arrival rate and the queue lengths, and that provides useful information for understanding vehicle delay of signalized intersection and for establishing performance index function of signal timing optimization. 展开更多
关键词 traffic signal control delay
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Research on relationship between geometrical dimensions and elongation of Polycarbonate tensile specimen 认领 引用
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作者 侯珍秀 乔刚 +3 位作者 汪波 胡兴鸿 张楠 王仲仁 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2011年第2期23-27,共5页
To provide convenience for the translation among specimens, orthogonal experimental method was used to research the relationship between geometrical dimensions （length, width and thickness） and total elongation of p... To provide convenience for the translation among specimens, orthogonal experimental method was used to research the relationship between geometrical dimensions （length, width and thickness） and total elongation of polycarhonate sheet, and simulations of tensile specimens with different geometrical dimensions had been conduc- ted by the finite element method, then regression analysis method was used to create the relationship formula be- tween geometrical dimensions and total elongation. It was found that： the shorter the length of specimen is, the better the plasticity is, and they had the power exponent relationship; the larger the width and thickness are, the better the plasticity is, and they had the direct proportion relationship with the total elongation. 展开更多
关键词 polyearbonate sheet total elongation dimensions of specimen orthogonal experiment FEA
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Reducing input/output current ripple for driving converter by multiple technology 认领 引用
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作者 黄军 杨世彦 +1 位作者 梁泉 盖晓东 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2011年第2期86-90,共5页
To improve the vehicle dynamic performance and ultra-capacitor operating circumstance,this paper studied the multi-current-two-quadrant converter applied to drive high power DC motor in ultra-capacitor electric bus(UC... To improve the vehicle dynamic performance and ultra-capacitor operating circumstance,this paper studied the multi-current-two-quadrant converter applied to drive high power DC motor in ultra-capacitor electric bus(UCEB).Compared with normal current-two-quadrant converter,the multi-current-two-quadrant converter can reduce the motor armature current ripple and the ultra-capacitor current ripple.Moreover,it improves power capabilities,reliability and fault tolerant capability of driving system.After analyzing the structure and working principle of the multi-current-two-quadrant converter,the expressions of armature current ripple and the quantitative relationships between the ultra-capacitor power loss and duty cycle were derived.The simulation and experimental results showed that the multi-current-two-quadrant converter has great advantages in reducing the armature current ripple and ultra-capacitor power loss,which can improve the vehicle performance and overall efficiency. 展开更多
关键词 multi-current-two-quadrant converter ultra-capacitor electric bus armature current ripple ultra-capacitor power loss efficiency
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Calibration of Camera with Large Field-of-View Based on Flexible Planar Target 认领 引用
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作者 Ju Huo Wen-Bo Dong +1 位作者 Ning Yang Wu-Kang Lin 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2013年第4期14-20,共7页
For high precision calibration of camera with large field-of-view,massive calibration points will be needed if traditional methods are selected,which makes the calibration complex and time-consuming.In order to solve ... For high precision calibration of camera with large field-of-view,massive calibration points will be needed if traditional methods are selected,which makes the calibration complex and time-consuming.In order to solve this problem,a calibration method based on flexible planar target is proposed.In this method,distortion factor is firstly acquired by the invariance of cross ratio,and existing feature points are adjusted with the distortion factor.Then,a large number of points that will be used for the calibration are constructed with the adjusted feature points.Simultaneously,Tsai method is modified so as to reduce the complexity of calibration,which makes the process linear.The simulation and real experiments show that the method proposed in this paper is simple,linear,accurate and robust,and the precision of this method is close to that of Tsai method using abundant points.The method can satisfy the requirement of high precision calibration for camera with large field-of-view. 展开更多
关键词 large field-of-view calibration distortion factor flexible planar target linear two-step method
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A measurement system of magnetism parameters for motion control 认领 引用
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作者 王晓明 黄旭艳 雷涛 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2007年第3期297-301,共5页
Magnetism parameters vary with the position and the speed of electromagnetic actuator's motion parts.The measurement unit presented in the paper can be applied to get the position and the speed feedback informatio... Magnetism parameters vary with the position and the speed of electromagnetic actuator's motion parts.The measurement unit presented in the paper can be applied to get the position and the speed feedback information from the measurement of electromagnetism parameters,and can constitute the untouched feedback sensing unit in the closed-loop motion control,and it adapts to the diversified feedback control of electromagnetic actuator.The digital miniaturization meter,based on MSP430 single chip processor,which can do the multi-purpose measurement of Φ & B through the menu selection,can be used for the electromagnetic actuator's performance evaluation and improvement,and also the online quality control in production process.Both real-time data graph and data table can be displayed in the meter.The paper presents the system's structure,describes the principle,discusses the working modes,and shows the software flowchart and the measuring results. 展开更多
关键词 motion control magnetism measurement electromagnetic actuator sensorless
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Dynamic error research and application of an angular measuring system belonging to a high precision excursion test turntable 认领 引用
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作者 邓辉宇 王欣利 马培荪 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2006年第2期156-159,共4页
Angular measuring system is the most important component of a servo turntable in inertial test apparatus. Its function and precision determine the turntable＇ s function and precision. It attaches importance to resear... Angular measuring system is the most important component of a servo turntable in inertial test apparatus. Its function and precision determine the turntable＇ s function and precision. It attaches importance to research on inertial test equipment. This paper introduces the principle of the angular measuring system using amplitude discrimination mode. The dynamic errors axe analyzed from the aspects of inductosyn, amplitude and function error of double-phase voltage and wavefonn distortion. Through detailed calculation, theory is provided for practical application; system errors are allocated and the angular measuring system meets the accuracy requirement. As a result, the schedule of the angular measuring system can be used in practice. 展开更多
关键词 test turntable angular measuring system dynamic error error model
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The research of the staggered lamination linear pulse launcher 认领 引用
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作者 宋立伟 张千帆 程树康 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2004年第6期601-604,共4页
This paper proposes a new type of pulse launcher that applies the principle of linear motors. The stator, viz. gun barrel, of the launcher has a new structure of one segment of iron core consisting of 3 staggered lami... This paper proposes a new type of pulse launcher that applies the principle of linear motors. The stator, viz. gun barrel, of the launcher has a new structure of one segment of iron core consisting of 3 staggered laminations. This structure is helpful in advancing the thrust force per volume. Based on introducing the structure and the working principles, this paper resolves the electromagnetic thrusting force and performs mechanical analysis and experiments on the sample launcher. The research shows that this launcher is simple and brushless structure with brief controlling. 展开更多
关键词 staggered lamination pulse launcher linear step motor
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Reflecting and transmitting effect of a planar unidirectionally conducting screen 认领 引用
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作者 鄂鹏 江滨浩 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2009年第2期242-246,共5页
The reflecting and transmitting effects of a planar unidirectionally conducting screen are analyzed based on the accurate closed-form expression for electric field of an arbitrarily oriented electric dipole.For a dipo... The reflecting and transmitting effects of a planar unidirectionally conducting screen are analyzed based on the accurate closed-form expression for electric field of an arbitrarily oriented electric dipole.For a dipole oriented along the wire elements of the screen,the screen acts as a perfectly electrically conducting plane.For a dipole perpendicular to the wire elements,the fields reflected by the screen can be interpreted as the contribution of an image dipole and image transmission-line current source,while the transmitted field is arisen from image transmission-line source.The expressions of related surface waves are derived and can be compared with previous results. 展开更多
关键词 electromagnetic fields unidirectionally conducting screen reflection and transmission electric dipole
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Application of generalized impedance boundary conditions to sommerfeld half-space problem 认领 引用
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作者 江滨浩 刘永坦 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2005年第2期179-183,共5页
Generalized impedance boundary conditions are employed to simplify the solution of the Sommerfeld half-space problem. An analytical expression is derived for the Hertz potential of a vertical electric dipole over the ... Generalized impedance boundary conditions are employed to simplify the solution of the Sommerfeld half-space problem. An analytical expression is derived for the Hertz potential of a vertical electric dipole over the earth’s surface, in which the earth is assumed to be a layered media or homogeneous dissipative half-space. A Sommerfeld type integral in the potential function is expressed as the sum of two parts: a zeroth order Hankel function and an absolutely convergent series of Bessel functions. In addition, two expressions in closed form are obtained as the far-field and near-field approximation of the present result. 展开更多
关键词 electromagnetic theory sommerfeld type integral generalized impedance boundary conditions analytical expression
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Scaling Analysis and its Applications of Electrostatic Micromotors 认领 引用
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作者 王欣利 程树康 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2004年第2期177-180,共4页
An electrostatic micromotor is compared with a conventional electromagnetic mieromotor, and the scaling effect of driving forces is analysed according to their different operation principles. Characteristic dimension ... An electrostatic micromotor is compared with a conventional electromagnetic mieromotor, and the scaling effect of driving forces is analysed according to their different operation principles. Characteristic dimension L represents the linear scale of micromotors. Electromagnetic driving force is proportional to high-order power of characteristic dimension L whereas electrostatic driving force is not. So, in micro domain, the effect of electrostatic force is larger than that of electromagnetic force, which makes electrostatic micromotor more competitive against electromagnetic alternative in MEMS. In assessing the performance of a micromotor, the power per unit volume and efficiency are the two most important criteria. Hence, the two kinds of micromotors are further compared from these two aspects. The results indicate that electrostatic a micromotor has higher power per unit volume and efficiency, moreover, its structure is simple, it can be made sufficiently small. For those advantages of electrostatic micromotors, they can be used in optical devices, aerospace equipment and medical instruments. 展开更多
关键词 MEMS scaling effect characteristic dimension micro domain
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A new complete model of switch-mode plasma cutting power supply 认领 引用 被引量：3
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作者 Abdolreza Esmaeli 孙力 聂剑红 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2004年第3期250-256,共7页
A complete model of switch-mode plasma cutting power supply and its simulation are developed. The full bridge isolated pulse width modulation (PWM) buck converter in continuous conduction mode (CCM) for high watt plas... A complete model of switch-mode plasma cutting power supply and its simulation are developed. The full bridge isolated pulse width modulation (PWM) buck converter in continuous conduction mode (CCM) for high watt plasma power supply is approached. Reduced ripple current and improved power factor are achieved in the plasma power supply. With a PID control strategy, circuit responses become more stable and faster with low overshoot during load and current changing. The converter achieved high efficiency under 3 to 15kW load conditions. 展开更多
关键词 plasma cutting power supply PWM buck converter PID compensator MATLAB simulation
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An improved spectral performance of SPWM inverter based on the time-sequence of chaos 认领 引用
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作者 李冠林 陈希有 +1 位作者 刘洪臣 杨伟 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2007年第1期59-63,共5页
A novel approach for improving the spectral performance of sinusoidal Pulse Width Modulation (SPWM) inverter is presented. By varying the carrier frequency according to chaotic time-sequence, the discrete spectrum of ... A novel approach for improving the spectral performance of sinusoidal Pulse Width Modulation (SPWM) inverter is presented. By varying the carrier frequency according to chaotic time-sequence, the discrete spectrum of the output voltage is transformed into the continuous spectrum, which could reduce the acoustic noise concentrated at specific tones in an inverter-driven electric machine. Fourier analysis shows that the harmonic at the fixed frequency has been restrained effectively and the distribution of the spectrum is in a wider range. Besides, a novel variable is introduced for the evaluation of the output voltage spectrum in SPWM inverter. Simulations and experiments with DSP confirm the advantages of the novel approach. Experimental results show the annoying acoustic noise has been translated into some enjoyable sound like a fall or water flowing when this novel method is applied. 展开更多
关键词 inverter SPWM harmonic time-sequence chaos
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A research on an energy-saving software for pumping units based on FNN intelligent control 认领 引用
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作者 丁宝 齐维贵 王凤平 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2004年第3期240-244,共5页
An energy-saving scheme for pumping units via intermission start-stop performance is proposed. Because of the complexity of the oil extraction process, Fuzzy Neural Network (FNN) intelligent control is adopted. The st... An energy-saving scheme for pumping units via intermission start-stop performance is proposed. Because of the complexity of the oil extraction process, Fuzzy Neural Network (FNN) intelligent control is adopted. The structure of the Takagi-Sugeno (T-S) fuzzy neural network model is introduced and modified. FNNs are trained with sample information from oil fields and expert knowledge. Finally, pumping unit energy-saving FNN software, which cuts down power costs substantially, is presented. 展开更多
关键词 rocker pumping unit T-S fuzzy system fuzzy neural network BP algorithm
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Determination of conditions for stable operation of induction motor resistance load using load flow and fuzzy techniques 认领 引用
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作者 Livingstone M.H.NGOO +2 位作者 郭志忠 Geoffrey ANDOGAH 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2001年第4期348-352,共5页
Discusses the significance of induction motor constant resistance (IM R) load on the lower part of the PV curve of a power system and determines the conditions for stable operation of IM R load using fuzzy techniques ... Discusses the significance of induction motor constant resistance (IM R) load on the lower part of the PV curve of a power system and determines the conditions for stable operation of IM R load using fuzzy techniques and load flow. 展开更多
关键词 induction motor resistance load PV curve power system instability and collapse load flow fuzzy method
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