检索结果-内蒙古大学图书馆

CSAA/IET International Conference on aircraft Utility systems (AUS 2024)

作者： Zijin Zhao Fanjiao Meng Shanghai Aircraft Design and Research Institute of COMAC Shanghai People's Republic of China Shanghai Aircraft Design and Research Institute of COMAC Experimental Verification Center State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai People's Republic of China

ISBN: (数字)9781837242108

The avionics system and brake system of an aircraft are critical, and their system-level HIRF test plays a key role in aircraft airworthiness certification, During the system-level Reverberation Chamber (RS) HIRF test process, the injected power value required at each frequency point during testing varies greatly, which leads to unstable output of the power amplifier and makes the actual received field strength in the reverberation chamber too high or too low, thus adversely affecting the test results. After studying and discussing the DO-160 standard and its supplementary guidance standard DO-357, it is found that the injected power smoothing algorithm can be introduced during the test to reduce the error between the actual received field strength in the reverberation chamber and the required field strength for testing. The test results show that after introducing the smoothing algorithm, the forward power curve is smoother, and the field strength obtained in the reverberation chamber is more stable, greatly reducing the situation of over-testing or under-testing, and improving the test stability.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Nose wheel steering mode analysis based on aircraft operation scenarios

Nose wheel steering mode analysis based on aircraft operatio...

引用

CSAA/IET International Conference on aircraft Utility systems (AUS 2024)

作者： Fan You Wenjie Chen Leilei Liu Da Li Hang Li Shanghai Aircraft Design and Research Institute No. 5188 Jin Ke Road Shanghai People's Republic of China State key laboratory of Airliner Integration Technology and Flight Simulation Shanghai 200126 People's Republic of China

ISBN: (数字)9781837242108

aircraft operations encompass a range of intricate scenarios, spanning from pre-flight preparation to parking and end of flight. By conducting scenarios analysis of the nose wheel steering system, this study establishes the usage scenarios for different steering modes, defines the modes' logic, and specifies the conditions for entering and exiting these modes. simulation analysis is employed to validate the correctness of the nose wheel steering scenarios and mode transitions, providing valuable insights for the design and trade-off analysis of nose wheel steering systems in civil aircraft.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Uncertainty analysis method for HIRF test of civil aircraft system

Uncertainty analysis method for HIRF test of civil aircraft ...

引用

CSAA/IET International Conference on aircraft Utility systems (AUS 2024)

作者： Fanjiao Meng Jiasi Wei Shanghai Aircraft Design and Research Institute of COMAC Experimental Verification Center State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai People's Republic of China Key Laboratory of Bioanalysis and Metrology for State Market Regulation Shanghai Institute of Measurement and Testing Technology Shanghai People's Republic of China

ISBN: (数字)9781837242108

Utilizing the reverberation chamber to build a system-level HIRF test system for civil aircraft, and the influencing factors of the uncertainty of the test system were qualitatively analyzed through the establishment of a mathematical model. The uncertainty is extended by quantitative analysis of the mathematical model, the measurement uncertainty of the HIRF test system is calculated, and the uncertainty factor influence is controlled to ensure the accuracy and reliability of the test results.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Research on installation relationship between door uplock and roller for civil aircraft

Research on installation relationship between door uplock an...

引用

CSAA/IET International Conference on aircraft Utility systems (AUS 2024)

作者： Liu Leilei Meng Qingtang Chen Wenjie Song Yifan Wang Hao Shanghai Aircraft Design and Research Institute State Key Laboratory of Airliner Integration Technology and Flight Simulation No. 5188 Jin Ke Road Shanghai People's Republic of China Shanghai Aircraft Design and Research Institution No.5188 Jinke Road Shanghai People's Republic of China

ISBN: (数字)9781837242108

This paper has performed an research for the installation relationship of MLG(Main Landing Gear) inner door uplock and roller. The interaction between hook, end stop of uplock and roller of MLG door is analyzed, key factors to stop the roller from moving away from uplock when it’s unlocked have been found. Tests of three cases on Iron Bird have been designed to verify the analysis result. The findings in this paper can be used to instruct the match installation design of MLG door uplock and the roller.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Nonlinear optimal control of rope hook recovery process

Nonlinear optimal control of rope hook recovery process

引用

CSAA/IET International Conference on aircraft Utility systems (AUS 2024)

作者： Min Huang Cheng He Xiaowei Hu State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai People's Republic of China Nanjing University of Aeronautics and Astronautics UAV Research Institute Shanghai 200126 People's Republic of China

ISBN: (数字)9781837242108

Fixed-wing UAV recovery technology is a key factor in determining the performance of fixed-wing UAVs, and as a new type of recovery method, rope hook recovery has the advantages of simple form and high recovery efficiency, but also has the defects of high overload and uncontrollable recovery process. In order to compensate for this defect, control is introduced into the rope hook recovery system. Firstly, a fixed-damped and variable-damped UAV hook recovery dynamics model is established, and the input and output of the UAV hook recovery process are decoupled and decomposed into two SISO systems. After that, a linear quadratic controller is used to track the velocity and displacement in all directions and feedback is well realized to approximate the planning results . The results show that the variable damping recovery system has the advantages of rapid recovery and smooth overloading over the fixed damping recovery system.

关键词：

来源：评论

学校读者我要写书评

暂无评论

HIRF Protection Design And Optimization For Nacelle Area Of The aircraft

HIRF Protection Design And Optimization For Nacelle Area Of ...

引用

Electrical Engineering and Automation (IFEEA), International Forum on

作者： Wei Xiong Leyi Wang Kai Han Environment Integration Department Shanghai Aircraft Design and Research Institute Shanghai China State Key Laboratory of Civil Aircraft Flight Simulation Shanghai Aircraft Design and Research Institute Shanghai China

ISBN: (纸本)9781665464222

With the application of composite materials (Carbon Fibre Composite and Metallic Mesh) on aircraft nacelles, A good HIRF protection design for the Fan Cowl can effectively reduce the induced current of the cables inside the nacelle in the HIRF environment. Fan Cowl of the nacelle should be multi-point electrically bonded to structure at the top and the bottom, to reduce the coupling of external HIRF fields on the internal cables. The specific nacelle design solution should be confirmed and improved through simulation and analysis in the early stages of design to achieve better HIRF protection for the sensitive electronic equipment installed inside it.

关键词： Couplings Electrical engineering Fans Analytical models Electronic equipment Composite materials Aerospace electronics

来源：评论

学校读者我要写书评

暂无评论

Damping orifice design of a civil aircraft's tail bumper

Damping orifice design of a civil aircraft's tail bumper

引用

CSAA/IET International Conference on aircraft Utility systems (AUS 2024)

作者： Ying Zhang Wenjie Chen Shanghai Aircraft Design and Research Institution State Key Laboratory of Airliner Integration Technology and Flight Simulation No.5188 Jinke Road Pudong New District Shanghai People's Republic of China Shanghai Aircraft Design and Research Institution No.5188 Jinke Road Pudong New District Shanghai People's Republic of China

ISBN: (数字)9781837242108

The damping orifice design and dynamic characteristics of a specific aircraft's tail bumper was studied. The systematic design method combining engineering estimation, theoretical analysis, co-simulation was proposed. To determine the build standard of damping orifice, firstly derived a damping dynamic equation of full-oil buffer, which help to set oil hole parameters, and build an equivalent model of tail bumper buffer drop dynamics, then conducted shock absorption simulation. This analysis yielded the dynamic characteristics against the stroke and time, validating the model and suitable oil hole design. Subsequently, a sleeve-type oil hole with equal diameter but variable distance was creatively designed. The design and analysis methods presented in the paper can serve as a reference for the development and design of future tail bumper buffers, contributing to the control of risks during minimum ground speed flight tests.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Vibration Shock Disturbance Modeling in the Rotating Machinery Fault Diagnosis ∶ a Generalized Mixture Gaussian Model

SSRN

引用

SSRN 2023年

作者： Wang, Ran Gu, Zhixin Wang, Chaoge Yu, Mingjie Han, Wentao Yu, Liang College of Logistics Engineering Shanghai Maritime University Shanghai201306 China School of Civil Aviation Northwestern Polytechnical University Xi’an710072 China State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai200126 China

In real-world industrial environments, complex background noises are composed of various components, deviating from a simple Gaussian distribution like shock *** this work, a robust noise modeling method based on the mixture of exponential power (MoEP) distributions is developed to address this issue. To proficiently extract the fault characteristics, the signal's 2-D representation is attained via Fast-SC, both of the fault features' low-rankness and the complex noise are combined in a signal model. Then, a penalized function of the noise model is combined to further improve the performance of the method. The model is designated as the PMoEP enhanced low-rank model (PMoEP-LR). The Generalized Expectation-Maximization (GEM) algorithm is utilized to estimate the low-rank spectral correlation matrix and deduce all parameters of the PMoEP-LR model. Finally, the enhanced envelope spectrum (EES) is used to detect the defect characteristic. The efficacy of the proposed method is showcased by analyzing both simulated and real data. © 2023, The Authors. All rights reserved.

关键词： Rotating machinery

来源：评论

学校读者我要写书评

暂无评论

3d Non-Synchronous Measurements of the Spherical Harmonic Domain with the Open Spherical Microphone Array

SSRN

引用

SSRN 2024年

作者： Yu, Liang Liu, Huimin Chu, Ning Fang, Guangyao Yang, Weihua Cai, Caifang Mohammad-Djafari, Ali School of Civil Aviation Northwestern Polytechnical University Xi’an710072 China College of Mathematics Taiyuan University of Technology Jinzhong030600 China Zhejiang Shangfeng Special Blower Co. Ltd Shaoxing312352 China State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai200126 China Zhejiang University China

The width of the mainlobe in the spherical harmonic domain (SHD) acoustic imaging is mainly influenced by the microphones array aperture and their number. This paper considers the spherical array (SA) of microphones and introduces the non-synchronous measurements (NSM) into the SHD to further improve the resolution of acoustic imaging in the SHD. The NSM is a sequential measurement technique that uses a prototype array to scan the sound source in some fixed positions, which can approximate the measurement results equivalent to a large apertures measurement system, and thus increases virtually the microphone density. The main contributions of this paper are: (1) the NSM technology is successfully merged into the SHD;(2) The spherical harmonic beamforming of NSM (NSM-SHB) and the sparse Bayesian learning of NSM in the SHD (NSM-SBL-SHD) methods are proposed. The effectiveness of the proposed methods is verified by simulation and loudspeaker experiments. The results demonstrate that the resolution of acoustic imaging is both improved by the NSM-SHB and NSM-SBL-SHD in the middle and low frequencies compared with the single measurement. Meanwhile, the computational speed of these two methods is further improved compared to conventional 3D acoustic imaging. © 2024, The Authors. All rights reserved.

关键词： Beamforming

来源：评论

学校读者我要写书评

暂无评论

Broadband Modal Identification Exploiting the Group-Sparse Characteristic of Aero-Engine Fan Noise Mode

SSRN

引用

SSRN 2024年

作者： Zhou, Xiaoping Gu, Hao Li, Hao Yu, Liang Wang, Ran Dong, Guangming College of Information Mechanical and Electrical Engineering Shanghai Normal University Shanghai201418 China School of Civil Aviation Northwestern Polytechnical University Xi’an710072 China State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai200126 China College of Logistics Engineering Shanghai Maritime University Shanghai201306 China Institute of Vibration Shock and Noise State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai200240 China

Fan noise is a significant component of aircraft noise, and modal identification is an effective method to analyze duct noise. In recent years, the research on tonal noise has been deepening and maturing, and broadband noise has become a challenge for duct noise research. In this paper, a broadband duct acoustic modal identification method based on group-sparse strategy and variational Bayesian inference is proposed based on the distribution characteristics of broadband mode. The group-sparse model is used to model the mode distribution, and the mode coefficients and associated parameters are estimated using variational Bayesian inference. The validity of the proposed method is verified through both numerical simulations and experimental tests. The results demonstrate the ability of the proposed method to determine mode coefficients accurately, and the results of the proposed method are also more consistent with the mode distribution characteristics. © 2024, The Authors. All rights reserved.

关键词： Inference engines

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：