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检索条件"主题词=Mechanical Engineering Computing"

共 446 条记录，以下是71-80 订阅

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Research of hydraulic pump cavitation on aircraft

Research of hydraulic pump cavitation on aircraft

引用

CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： B. Yang Shanghai Aircraft Design & Research Institute COMAC Landing Gear and Hydraulic system Department Shanghai China

Base on the problem of low pump suction pressure in aircraft hydraulic system, the main factors affecting the suction pressure are studied through theoretical analysis and simulation analysis. Analysis show that the rapid increase in system flow demand at the moment the control valve opening is the main reason for the low suction pressure. The proposal is given combined with the actual installation of hydraulic system and the influence of weight and other factors. The simulation model is built in AMESim software. Finally, the test goes on the iron bird. The results show that prolonging the opening time of the control valve can effectively increase the suction pressure of the hydraulic pump. It provides important guidance and reference for the design and layout of the aircraft hydraulic system.

关键词： hydraulic systems mechanical engineering computing cavitation pumps valves

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Research on soft sensing of aircraft nose landing gear shimmy damp based on neural network

Research on soft sensing of aircraft nose landing gear shimm...

引用

CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： Z. Liu X. Li X. Ding Z. Wang AVIC The First Aircraft Institute Department of Mechanical & Electronic System Xi’an 710089 China

The mechanism of the nose wheel shimmy is complicated and influenced by many factors, and it shows nonlinear characteristics. The damping characteristics of the nose wheel steering system of a certain aircraft are measured by the damping test. The relationships between the damping characteristics of the nose wheel steering system and the damping aperture diameter, the excitation frequency and the excitation amplitude of the system are analyzed. Rely on the powerful nonlinear mapping ability and generalization function of BP neural network, built up the soft sensing model of BP neural network structure, whose inputs are shimmy damping aperture diameter, excitation frequency and excitation amplitude and output is shimmy damping values. Learned and predicted the model use the neural network. The prediction results proved the feasibility and practicability of this method.

关键词： vehicle dynamics aircraft backpropagation neural nets steering systems wheels gears damping soft sensors aerospace computing mechanical engineering computing

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Cluster analysis of vehicle driving conditions based on K-means algorithm and EM algorithm

Cluster analysis of vehicle driving conditions based on K-me...

引用

CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： Q. Yan Y. Ma Y. Li School of Mechanical Engineering Beijing Institute of Technology Beijing China

The simulation and evaluation of land vehicle performance requires accurate representation of driving conditions. The ability to effectively interpret this condition to estimate the power demand is important for the energy management and plays crucial role in the battery utilization. After collecting driving status of vehicle, two algorithms (K-means Clustering and EM Algorithm) are employed for clustering the working condition blocks. Finally, compare the clustering effects of the two algorithms, and draw the conclusion that EM Algorithm is better.

关键词： vehicle dynamics energy management systems pattern clustering expectation-maximisation algorithm automobiles kinematics mechanical engineering computing

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Anti-vibration and heat dissipation design of high power control driver for space

Anti-vibration and heat dissipation design of high power con...

引用

CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： S. Zhang W. Liu B. Gao C. Lin C. Xiao Z. Hou Beijing Research Institute of Precise Mechatronic Controls Beijing China Shentuo Beijing Science & Technology Co. Ltd Beijing China

The high-power control driver for space must withstand the harsh mechanical environment during its launch process, and at the same time, it has brought new challenges to its heat dissipation due to the space vacuum environment. Based on the analysis of the force transmission and heat transfer path of the control driver, a design method to optimize the mechanical design and thermal design is proposed. Through workbench simulation analysis and experimental verification, it is proved that the design method effectively improves the vibration resistance and heat dissipation capacity of the control driver.

关键词： cooling mechanical engineering computing design engineering servomechanisms space vehicles vibration control power control computer simulation control engineering computing drives

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Electronic System for Calculation-Experimental Determination of the Modal and Damping Characteristics of Active Viscoelastic Beams

Electronic System for Calculation-Experimental Determination...

引用

IEEE International Conference on Electronics and Nanotechnology (ELNANO)

作者： Roman D. Yershov Olena V. Savchenko Anatoliy P. Zinkovskii Oleh L. Derkach Chernihiv National University of Technology Chernihiv Ukraine G.S. Pisarenko Institute for Problems of Strength of the NAS of Ukraine Kyiv Ukraine

ISBN: (数字)9781728197135

ISBN: (纸本)9781728197142

Analytical and experimental investigations of active damping of free vibrations of a cantilever viscoelastic beam assembled together with the piezoelectric actuator and piezoelectric sensor are performed. In order to include dissipative properties of composite material, the complex elastic modulus is used. The dependence of modal characteristics (complex natural frequency and decrement of vibrations) under variation of the proportional and derivative gains of controller is experimentally investigated by dint of developed hardware and software platform, which structure and specific operation features are also highlighted in this paper.

关键词： beams (structures) cantilevers damping elastic moduli mechanical engineering computing piezoelectric actuators vibration control viscoelasticity mechanical engineering computing Piezoelectric actuators CANTILEVER Elastic Modulus vibration control viscoelasticity Electronic systems absorption of shock Damping capacity Piezoelectric sensors free vibrations

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Design and simulation of fuel supply regulation system of multi-channel electric fuel pump

Design and simulation of fuel supply regulation system of mu...

引用

CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： X. Zhao L. Li X. Ge C. Pei Beijing Power Machinery Institute Beijing China

The ramjet engine needs to adopt active thermal protection in the high-temperature and high-pressure working environment. The low-temperature fuel supplied by the fuel pump is used to actively cool the engine intake port, combustion chamber and other parts, and then through the reasonable distribution and precise control of the multi-channel high-temperature fuel control valve to meet the fuel demand of the engine under different working conditions. In this paper, the plan design of the electric fuel pump of the ramjet engine is given; two different multi-channel fuel pump fuel supply adjustment schemes are given; the high temperature fuel adjustment valve is analyzed and calculated, and the one pump and three valves plan is simulated by the AMESim software. Simulation analysis was performed on the fuel supply adjustment system. The simulation results show that the flow distribution of the multi-channel fuel supply system can meet the design requirements.

关键词： jet engines combustion valves fuel pumps control engineering computing computer simulation mechanical engineering computing fuel systems

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APPLICATION RESEARCH ON EVALUATION OF AERO-ENGINE BLADE PROFILE PARAMETERS

APPLICATION RESEARCH ON EVALUATION OF AERO-ENGINE BLADE PROF...

引用

The 8th International Symposium on Test Automation &Instrumentation (ISTAI 2020)

作者： T. Pan X. M. He G. X. Wu X. J. He X. L. Xu Key laboratory of Modern Measurement and Control Technology Beijing Information Science and Technology University Beijing China Avic Changcheng Institute of Metrology & Mesurement Beijing China

The geometrical size of the aeroengine blade profile are mainly measured by coordinate measuring machines. And then the parameters are evaluated by software analysis. Now the software for evaluating blade parameters mainly includes products of companies such as Renishaw, Hexagon, Zeiss, and Geomagic. By using the same coordinate measuring machines (CMM) and different software to carry out the comparative experiment of measuring the parameters of model and actual blade with the contour section, the method for experimenting and comparing with the algorithms of the blade profile parameter is proposed. It expounds the general parameters, general algorithms and the magnitude of data discrepancy of measurement software. The experiment results show that Hexagon and Renishaw are more comprehensive than Zeiss and Geomagic in terms of parameter algorithms. On the other hand, the contour of the actual blade is not perfect curve, which leads to errors in measurement, so that the deviation of the evaluation value of the parameters on the actual blade is much larger than that on the model.

关键词： aerospace engines coordinate measuring machines blades measurement errors mechanical engineering computing

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RESEARCH ON FAULT DIAGNOSIS WITH SMALL SAMPLE FOR PLANETARY GEAR SYSTEM WITH SEMI-SUPERVISED LEARNING AND DBN ALGORITHM

RESEARCH ON FAULT DIAGNOSIS WITH SMALL SAMPLE FOR PLANETARY ...

引用

The 8th International Symposium on Test Automation &Instrumentation (ISTAI 2020)

作者： C. Ma L. Song S. Wang Z. Yang Key laboratory of Modern Measurement and Control Technology Beijing Information Science and Technology University Beijing China Key laboratory of Space Utilization Technology and Engineering Centre for Space Utilization Chinese Academy of Sciences Beijing China

Objected to fault diagnosis of planetary gearbox, the research and implementation of classification model on small sample with semi-supervised learning and DPN in this paper is carried out. Firstly, the acceleration sample data for four status of the planetary gearbox are obtained, which are including the normal, internal ring gear fault, sun gear fault and Coupling fault between planetary gear and bearing. And the feature vector is built with characteristic parameters such as average amplitude, kurtosis, root mean square, root square amplitude, form factor, crest factor and margin factor. Then the data is delt with CEEMD method for noise reduction and continually the parameters are computed. Then the vector is as input of DBN and Semi-supervised Learning algorithm to fault diagnosis for planetary gear system. Also the comparison competition are done by using DBN and SVM. The results show that under the small sample data, the method of CEEMD - DBN could be more effective under small sample data. The research could provide an effective method for the diagnosis and classification of small sampling projects.

关键词： belief networks gears mechanical engineering computing fault diagnosis supervised learning signal denoising rings (structures) machine bearings mean square error methods unsupervised learning Hilbert transforms

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Intermittent fault detection and diagnosis for aircraft fuel system based on SVM

Intermittent fault detection and diagnosis for aircraft fuel...

引用

CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： Y. Jiang Y. Miao Z. Qiu Z. Wang J. Pan C. Yang Beijing University of Technology Faculty of Materials and Manufacturing Beijing China The 18th Institute China Academy of Launch Vehicle Technology Beijing China AVIC Nanjing Electromechanical Hydraulic Engineering Center Nanjing China

Intermittent faults have the characteristics of short duration, repeated occurrence and unobvious fault features. If the intermittent fault in aircraft fuel system can not be diagnosed accurately and promptly, it will cause serious accidents. A method of intermittent fault diagnosis based on support vector machine (SVM) is presented. A simulation platform based on Flowmaster is built to simulate the intermittent fault in the aircraft fuel system. The fault signal features in the fault system are extracted according to the time series. These fault features are trained as the training data of *** training results show that this method can accurately diagnose and locate intermittent fault in aircraft fuel system.

关键词： fault diagnosis support vector machines fault location fuel systems jet engines mechanical engineering computing aerospace computing computer simulation

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Study on initial compression rate of O-rings with different cross-sectional diameters

Study on initial compression rate of O-rings with different ...

引用

CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： W. Yang H. Yan D. Zhang Nanjing Engineering Institute of Aircraft Systems Department of Hydraulic and Actuation System Nanjing China

As the working pressure of the aircraft hydraulic system increases, seal failures often occur in hydraulic products, especially high-pressure linear reciprocating seals which are more prone to failure. The key factor affecting seal failure is the initial compression rate. This paper uses ANSYS to conduct simulated analysis on the impact of the initial compression rate of O-rings with different cross-sectional diameters over the sealing performance under different working conditions and to obtain the initial compression rate range corresponding to different cross-sectional diameters. It plays a significant role in providing theoretical support to the design and reliability analysis of O-rings and improving sealing reliability.

关键词： sealing materials rings (structures) hydraulic systems reliability seals (stoppers) mechanical engineering computing computer simulation failure (mechanical) aircraft

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