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检索条件"主题词=Mechanical Engineering Computing"

共 446 条记录，以下是81-90 订阅

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Research on aircraft fuel measurement method based on machine vision

Research on aircraft fuel measurement method based on machin...

引用

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

作者： H. Zhu Y. Shao S. Xu Nanjing Engineering Institute of Aircraft System AVIC Nanjing China

This paper focuses on the problem of aircraft fuel measurement, a visual measurement method is introduced, which uses the optical camera to collect the fuel level images and calculate the fuel from the image data. Considering the redundant information in the image will reduce the processing speed, a contour extraction method based on HSV color model is proposed to simplify the image. The Convolution Neural Network (CNN) is used to extract the fuel image features, and the fuel prediction model based on Long Short-Term Memory (LSTM) network is constructed. The effectiveness of the visual measurement method is verified by simulation.

关键词： computer vision feature extraction image colour analysis recurrent neural nets convolutional neural nets aircraft fuel systems mechanical engineering computing

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Optimization of ball screw transmission six-DOF platform based on error analysis

Optimization of ball screw transmission six-DOF platform bas...

引用

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

作者： Z. An F. Gao Y. Yu Qing An Group Co. Ltd Xi’an China

This study proposes an optimization method based on error analysis for ball screw transmission six-DOF platform (BSTSP). The error model of BSTSP has been built up based on the simpler error source model. According to the error model, the upon platform outputting error influenced by structural parameters has been computed. And the preferable range of the structural parameters is preliminarily identified. Then the upon platform outputting error is set as optimization objective function. The structure of BSTSP is optimized by using ADAMS based on error analysis. The optimal analysis results provide an important basis for improving the space position accuracy of BSTSP.

关键词： ball screws error analysis power transmission (mechanical) mechanical engineering computing optimisation

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Structure design and simulation analysis of series three windows unsymmetrical valve plate

Structure design and simulation analysis of series three win...

引用

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

作者： K. Zhang J. Zhang X. Huang Z. Guo C. Huang Zhejiang University Department of Mechanical and Electrical Engineering Hangzhou China Hydraulic Transmission Research Institute Linde Hydraulics GmbH & Co. KG Weifang China

At present, the valve-controlled cylinder system is widely used in airborne system. But due to the serious throttle loss at the valve port, the system has large heat output and low efficiency. The pump-controlled system can effectively avoid this problem, which has the advantages of simple circuit and convenient control. However, because the pump-controlled unsymmetrical cylinder technology is not mature, it cannot be widely used in the airborne system. In this paper, a series three windows unsymmetrical valve plate structure was designed to solve the key problem of pump-controlled unsymmetrical cylinder system, the different flow between two chambers of an unsymmetrical cylinder. According to the designed valve plate, a simulation model of pump-controlled unsymmetrical cylinder system was built for simulation analysis. The results showed that the valve plate structure could be used to realize the closed pump-controlled unsymmetrical cylinder system, which simplifies the hydraulic circuit greatly. The study provides a new idea for the realization of pump-controlled unsymmetrical cylinder in airborne system, and it can be used as a guide for the design of serial three windows valve plate.

关键词： valves pumps mechanical engineering computing plates (structures) hydraulic systems hydraulic control equipment design engineering computer simulation control engineering computing

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Bayesian network based fault diagnosis of aero hydraulic pump

Bayesian network based fault diagnosis of aero hydraulic pum...

引用

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

作者： X. Fu Shanghai Aircraft Design and research Institute Shanghai China

In this paper, the reliability of civil aviation hydraulic pump source (engine driven pump) is studied by using performance degradation reliability theory and Bayesian Network(BN) method. In this paper, firstly, the relationship between Bayesian Network algorithm and fault parts of hydraulic pump is studied, then the Bayesian Network algorithm is used for diagnosis and reasoning with incomplete simulation data. Finally, the validity of the method is verified by simulation data, which can indicate that the accuracy of fault diagnosis is improved. Furthermore, scientific basis and guidance for airlines to carry out fault prediction and make optimal maintenance planning is provided.

关键词： hydraulic systems belief networks fault diagnosis pumps reliability theory mechanical engineering computing maintenance engineering aerospace computing aerodynamics aerospace engines

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Modeling and simulation of APU inlet door actuator based on motion and CATIA

Modeling and simulation of APU inlet door actuator based on ...

引用

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

作者： W. Zhi W. Zheng A. Chen D. Liu The Aeronautical Facility Research Institute Qingan Group. Co. Ltd Xi’an China

In this paper, a set of inlet door actuator is designed to open and close the inlet door in APU cabin of a large wide-body civil aircraft. Compared with the traditional design method's complicated calculation process, low calculation accuracy and high cost of verification experiment, the paper establishes the multi-body dynamics simulation analysis model of the inlet door actuator via LMS *** and CATIA. From the perspective of aerodynamic load and ice-breaking load, the kinematics and dynamics simulation analysis of the APU inlet door actuator was carried out. The simulation results show that the inlet door actuator can meet the requirements of inlet door opening time and opening angle, effectively verify the feasibility of the design scheme of inlet door actuator, and provide theoretical support for the design and analysis of the system.

关键词： aerospace components mechanical engineering computing design engineering aircraft aerodynamics intake systems (machines) computer simulation kinematics

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Electric unlocking system simulation of front landing gear emergency release based on virtual prototype

Electric unlocking system simulation of front landing gear e...

引用

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

作者： X. Li Z. Liu Y. Yin J. Zhao Landing Gear System Research Institute FAI AVIC Xi’an China Nanjing University of Aeronautics and Astronautics Nanjing China

Electric unlocking mechanism dynamic model and motor control system model of a aircraft nose landing gear emergency release system were established, and the complete virtual prototype of the nose landing gear emergency release electric unlocking system was formed. Based of the virtual prototype, simulation and analysis of the performance of electric unlocking were accomplished, the results of simulation were compared with that of laboratory test. The results show that the simulation results are basically consistent with the test results, and the simulation model can be used for the simulation of the front landing gear emergency release electric unlocking system.

关键词： virtual prototyping gears aircraft computer simulation mechanical engineering computing aircraft landing guidance control engineering computing aerospace computing

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Research on hydraulic dump response performance of civil aircraft brake system

Research on hydraulic dump response performance of civil air...

引用

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

作者： G. Zhang B. Chen S. Dong Shanghai Aircraft Design and Research Institute Shanghai China Automation Science and Electrical Engineering of BEIHANG University Beijing China

The brake system is one of the main ways to slow down speed of an aircraft on the ground. The core evaluation index of brake system performance is anti-skid efficiency. The high braking efficiency can effectively shorten the braking distance of the aircraft, reduce tire wear, and prevent puncture caused by wheel slip. In this paper, the entry point of study is the impact of the brake hydraulic dump time on the brake anti-skid efficiency. Aiming at the problem of insufficient hydraulic dump time of a certain type of civil aircraft brake system, the influence of the brake system hydraulic components on the brake hydraulic dump time is analyzed by the method based on AMESim and Matlab joint simulation. Finally, the key factors that restrict the dump time of the brake system are determined, and a set of system improvement parameters are proposed to provide a solution for the optimal design of the anti-skid efficiency of the aircraft brake system in the later period.

关键词： brakes wear hydraulic systems tyres braking vehicle dynamics mechanical engineering computing wheels aircraft aerospace computing computer simulation

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Modeling and simulation of A8 synchronous actuation system based on Modlica

Modeling and simulation of A8 synchronous actuation system b...

引用

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

作者： Z. Wu S. Wu W. Wang S. Wang M. Gu Z. Jiao School of Automation Science and Electrical Engineering Beihang University Beijing China Qing’an Group Co. Ltd. AVIC Xi’an China

According to the structural characteristics and working principle of the A8 synchronous actuation system of the vectoring exhaust nozzle, mathematical models of its actuator, screw/nut, worm gear/worm and other components were established, and the model of A8 synchronous actuation system based on Modelica was built in SimulationX. This model was simulated, and the displacement, synchronization and force changes of the system were analysed. This paper covers the shortage of understanding about the load characteristics of A8 synchronous mechanism, and it also provides a platform for the parameter selection, force analysis, and fault diagnosis of A8 synchronous actuation system.

关键词： mechanical engineering computing fault diagnosis gears nozzles fasteners exhaust systems

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Analysis of thermal comfort with the adjusted predicted mean vote

Analysis of thermal comfort with the adjusted predicted mean...

引用

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

作者： H. Liang Shenyang Aircraft Design & Research Institute Shenyang China

In this work, the APMV (adjusted predicted mean vote) was proposed, which was suited to analyzing thermal comfort with the direct solar irradiance, low air pressure and low relative humidity. The computing flowchart was presented, which was suited to analyzing the required parameter when other parameters in the equation were given. The effects of clothing insulation, direct solar irradiance, air temperature, metabolic rate, mean radiant temperature, relative humidity, air pressure and air velocity on thermal comfort were analyzed quantitatively on the basis of APMV. The results indicated these parameters affected thermal sensation greatly and should be paid attention. The given method and obtained conclusions in this work could provide reference value for environmental control system design in the future.

关键词： clothing humidity atmospheric temperature thermal comfort thermal insulating materials flowcharting mechanical engineering computing solar radiation

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REVIEW OF FAULT DIAGNOSIS METHODS FOR ROTATING MACHINERY BASED ON DEEP LEARNING

REVIEW OF FAULT DIAGNOSIS METHODS FOR ROTATING MACHINERY BAS...

引用

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

作者： Y. L. Guo G. X. Wu X. L. Liu X. L. Xu The Ministry of Education Key Laboratory of Modern Measurement and Control Technology Beijing Information Science&Technology University Beijing China

mechanical equipment fault diagnosis technology is a new research field with the development of modern science and technology In recent years, the deep learning has been applied into the field of mechanical equipment fault diagnosis by more and more researchers. Deep learning has been widely applied in various in dustries and fields with its unique advantages in feature extraction and pattern recognition. The development history of deep learning is first briefly reviewed. Then, four fault diagnosis methods based on deep learning model are emphatically analyzed com bined with the characteristics and requirements of fault diagnosis technology for large rotating machinery equipment, and the problems and challenges they face are discussed. Finally, the research direction worth to be carried out in the future is prospected.

关键词： fault diagnosis mechanical engineering computing feature extraction machinery learning (artificial intelligence)

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