bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study of Zero Gravity Unloading Effect of Mechanical Steerable Satellite Antenna
Authors: Xie Zhuo , Hou Guanzhong , Zhao Ying , Kou Mingkun 
Published: December 2023

Abstract
Due to the limitations of self-structure and test conditions, the actual unloading point is difficult to coincide with the theoretical centroids in a mechanically steerable satellite antenna’s ground zero gravity simulation test. There is a residual moment of unloading. Three-axis mechanical steerable antenna was taken as the research object. Based on a suspension system, the static models of antenna unloading under vertical and horizontal deployment modes were established. The general formula of the joint residual moment was derived. The influence of deployment mode on the joint torsional moment under different working stages was studied. The result shows that the joint torque in the horizontal deployment test is much better than that in the vertical deployment test, with low data peaks and good stability. The horizontal deployment test is preferred for the ground test. The method has been successfully applied to the antenna development of multiple satellites. It has practical guidance and application value for subsequent similar antenna unloading scheme designs.
Design of Power Supply for Distributed Aero-engine Intelligent Control System
Authors: Xu Jing , Zhou Jian , Qian Rongrong 
Published: December 2023

Abstract
Compared with centralized power supply system architecture, distributed power supply architecture can better meet the requirements of distributed aero-engine intelligent control systems. The design of distributed power supply topology plays a vitally important role in the distributed power supply system. The paper presents an engineering design method of distributed power supply for the distributed control system in a certain aero-engine. The distributed power supply topology is developed. Based on this topology, the bus voltage level and the current of the distributed intelligent nodes are designed. The optimal selection method of transmission cable types between intelligent nodes is also provided based on the equivalent circuit of a distributed power supply system. The results show that the cable transmission loss and voltage drop meet the design specifications of electrical cable. The proposed distributed power scheme for the distributed engine control system results in minimal modifications, smaller transmission current, and lighter cables.
Integrated design of sun-synchronous orbit and launch vehicle trajectory for operationally responsive space
Authors: He Shaofei , Gu Zhenfeng , Xu Huijuan , Xu Xiao , Xu Xingshun 
Published: December 2023

Abstract
For the operationally responsive space mission with the known launch point and target area, based on the simplified trajectory, the design method of the sun-synchronous orbit is given by the orbit dynamics, considering the mutually constrained relationship between the satellite orbit and the launch vehicle trajectory. Then, with the orbit parameters as the input, the trajectory model obtains the actual trajectory parameters. Considering the error between the actual and simplified trajectory parameters, the actual trajectory parameters are used to correct the simplified trajectory. Finally, by iterative calculation, the parameters of sun-synchronous orbit and launch vehicle trajectory for operationally responsive space are obtained with the finite trajectory error. For a typical example, the parameters are calculated by the method, which is verified by the STK simulation, demonstrating the feasibility and practicability of the method. The design method can provide theoretical support for the orbit and trajectory design of operationally responsive space.
Design of Micro Piezoelectric Stick-Slip Rotating Motor
Authors: Lu Jiangang , Xie Xingyang , Cui Yuguo , Yang Yiling 
Published: December 2023

Abstract
In the article, the design of a piezoelectric stick-slip rotary motor is proposed that can be used as the rotary drive part of a micro-nano operation. First, a force-coupled stator based on a flexible mechanism with a diameter of 23 mm was designed. Based on the designed stator, the structure of the rotary motor is constructed and its motion steps are analyzed. Then, finite element analysis is performed. Finally, the performance of the motor is tested and conclusions are drawn. The simulation and experimental results show that the developed motor performs well.
STTSRL: Design of Triple-Node Upset Self-Recovery Latch Based on Schmidt Trigger
Authors: Zhou Jing , Zhang Jishan , Zheng Chun 
Published: December 2023

Abstract
With the continuous progress of semiconductor technology, the size of transistors has reduced, and the sensitivity of logic circuits to soft errors caused by radiation has enhanced. The multiple-node upset caused by radiation has affected the reliability of the circuit. This paper proposes a triple-node upset (TNU) self-recovery latch based on the Schmidt trigger (ST) for radiation hardness. The feedback loop is formed by connecting C-elements (CEs) and STs. Using the error filtering mechanism of CE and the hysteresis effect of ST is to realize the reliability of STTSRL. Under the 22 nm PTM process in HSPICE simulation, the STTSRL latch has TNU self-recoverability. Compared with the average value of the same recoverability latch proposed previously, the power consumption, delay, area, number of transistors, and PDAP are reduced by 44.85%, 53.32%, 40.34%, 19.24%, and 83.54%, respectively.
Cooperative Path Planning of Ground-air Robots for Distributed Photovoltaic Inspection
Authors: Liao Chuanqi , Liu Zuoshi 
Published: December 2023

Abstract
Facing the Distributed PV generation inspection scenario, to overcome the low efficiency of traditional manual inspection and the insufficient endurance of existing UAV inspection, UAV aerial inspection and UGVs to provide energy supply in the road network are adopted, and a path planning method that prioritizes the meeting points is proposed. Firstly, the improved genetic algorithm is used to plan the inspection path of each UAV, then the UAV path is clustered to determine the optimal number of meeting points, then the adaptive particle swarm algorithm is used to find the best location of the meeting points in the road network, and finally, the patrol path with the meeting points is optimized twice. Through the simulation test of the standard data set and real data, the effectiveness of the proposed method in solving the path planning problem of distributed photovoltaic coordinated inspection by ground-to-air robots is verified.
Design of Conformal Cooling System with Lattice-structure of Mold Based on 3D Printing
Authors: Zhao Caoxi , Chu Zhong , Kang Hui , Ni Zihan , Li Zhitong , Zhang Jicong 
Published: December 2023

Abstract
The conformal cooling water circuit manufactured by using metal 3D printing SLM technology has significant advantages, compared to the straight drilling cooling water circuit, but there is still a problem of large temperature differences in local mold positions. Based on a circular cross-section spiral-shaped waterway, this article proposes a design that replaces a circular cross-section single helix with a runway-shaped double helix structure and sets a lattice structure in areas with large temperature differences. Finally, Moldflow is used to simulate the cooling effects of the two cooling forms. The results show that the lattice structure can significantly improve the phenomenon of uneven cooling, and the surface temperature difference of the mold has been improved by 41%. Compared to the circular section, the runway-shaped section has a better cooling effect, better temperature distribution, and more uniform cooling.
Real-Time Guided Positioning Method of Single-Station Theodolite in Height-Keeping Flight Scene
Authors: Liu Chuanling , Zhao Ke , Fu Feiya , Lei Hao 
Published: December 2023

Abstract
The photoelectric theodolite of high precision without laser ranging system has been frequently used in the actual exterior ballistics test of conventional weapons to complete the testing task. In the specific test section, there has been only one theodolite tracking the target or multiple theodolites tracking but can’t meet the intersection conditions, which can’t provide guidance data for other stations, leading to testing task failure. To improve the ability to complete the tasks successfully, a real-time guided positioning method of single-station theodolite is proposed for the special test scene of the height-keeping flight target. The accuracy estimation model is established according to the mathematical model of line-surface intersection. The simulation experiment verification and practical application effect show that our method can meet the accuracy requirement of real-time guidance in the shooting range so that the reliability of this test task can be improved and the guidance mode of external measurement in the shooting range can be enriched.
Research on chamfer structure effects for the microforce measuring device output
Authors: Li Chuang , Hu Lihong , Li Qian , Xu Li , Wang Shuxiang 
Published: December 2023

Abstract
The influence of chamfer structure on microforce measuring device output has been researched by theoretical calculation and numerical simulation. The relationship between the chamfer dimensions and the microforce output was analysed under different parameters such as electrode intersection length and electrode spacing. Based on the analysis of the electric field distribution of the capacitive microforce device, the mechanism of improving the device output performance with chamfer had been obtained. The results show that the influence of the chamfer was not obvious when the electrode gap was large. With the decrease in the electrode gap, the chamfer could effectively improve the electric field distribution between the electrodes, so as to form a section insensitive to the electrode intersection length. In this region, even if the intersection length changed greatly, the device could still produce a very stable microforce. This research could be used as a guide to improve the accuracy and stability of microforce measuring devices.
Analysis of Error Sources of a Torque and Rotation Angle Calibration Unit Based on Statics
Authors: Zhao Jiliang , Wang Liyang , Shou Junming , Shi Hailin , Gu Jiajun , Yang Mei , Li Hongbo , Li Guanren , Xiong Wanzhong 
Published: December 2023

Abstract
The structure and working principle of the torque calibration unit, the index angle calibration unit, and the loading mechanism are introduced. Using finite element analysis tools for static analysis, the error sources of the calibration process are obtained and the influence on the calibration results is analyzed. Among them, the influence of connecting rod deformation, torque transmission characteristics, and flexible deformation on the calibration accuracy is small and can be ignored. Bearing friction, coaxiality, and micro-deformation of the test bench are inherent errors of the system. For its own inherent error attribute, it will not affect the relationship between the sensor to be calibrated and the standard sensor on the output shaft of the index test bench, that is, it will not affect the calibration process of the sensor to be calibrated later.
Research on Electronic Differential Steering Control Strategy for Aircraft Electric Tractors
Authors: Gao Jianshu , Jing Cao 
Published: December 2023

Abstract
Compared with the traditional fuel aircraft tractor, the electric tractor using the four-wheel hub motor independent drive mode has the advantages of environmental protection, low costs, flexibility, high controllability, and convenience for later maintenance. The paper uses a four-wheel hub motor tractor and a linear vehicle model to propose a hierarchical steering control strategy. The upper layer control adopts the improved integrated sliding mode control algorithm with the yaw angular speed as the control goal to obtain the additional yaw torque. The additional yaw torque obtained is reasonably distributed to each wheel by the use of the rule distribution algorithm of the lower layer control, to obtain the optimal driving torque of each wheel. Finally, the steering stability of the electric aircraft tractor at different speeds is verified based on Simulink. The results show that the control strategy can better control the speed and stability of steering control of electric vehicles.
Aeroacoustic Analysis of Rapid Position Changing Process of Missile Seeker Equipment
Authors: Wang Yanqing , Kang Wei , Hu Shilin 
Published: December 2023

Abstract
A two-dimensional CFD model of the rapid position-changing of missile seeker equipment is presented to study its aeroacoustic impact. By combining the computational fluid dynamics (CFD) with the Ffowcs Williams-Hawkings (FW-H) equation, the flow and related aeroacoustic features are analyzed under different flight Mach numbers and flight heights. The impact of seeker movement on the flow field and aerodynamic noise are highlighted. The results indicate that the spectrum peak of sound pressure level increases with the vortex shedding frequency as the flight Mach number increases. As the flight height of the missile increases, the sound pressure level is amplified while the frequency of vortex shedding decreases.
Slat Control Asymmetry Failure Simulation and Research
Authors: Ma Yuan 
Published: December 2023

Abstract
To construct the slats control system model and design asymmetry failure injection in the Slats control model, this paper provides an operation analysis of Slat system control and mechanical actuation in detail. The model of a slat control system based on Matlab or Simulink is established. Also, the method of slat asymmetry failure injection is designed, the root cause of slat asymmetry failure is listed, and left slat asymmetry failure is simulated via the designed model. The results demonstrated that the slats control system model and failure injection method can support the simulation of slat asymmetry failure and established the basis for subsequent research on the slats control system.
Fault Diagnosis of Rotating Machinery under Complex Conditions Based on Multi-Scale Convolutional Neural Networks
Authors: Kang Jing , Luo Yuting , Wang Peng , Wei Ye , Zhou Yiren 
Published: December 2023

Abstract
In complex operational scenarios involving variable speeds, burdens, and noise, rotating machinery necessitates extended maintenance. Extracting stable and effective fault-sensitive features under such intricate conditions presents a significant challenge. To tackle this issue, the paper introduces the Multi-Scale Convolutional Neural Network (MSCNN) model tailored specifically for such complexities. The approach in this paper simultaneously captures multi-scale vibration signal features using the innovative Multi-Scale Bifurcation (MSB) module and subsequently aggregates them through a multi-scale fusion layer. This model effectively addresses the common problem of low CNN accuracy in fault diagnosis. The paper validates methodology using a bearing dataset provided by Case Western Reserve University (CWRU) and demonstrates superior performance compared to classical CNN models and other alternatives, achieving an impressive 99.56% classification accuracy for normal signals.
Research on the influence of time delay on combat effectiveness of aircraft fleet
Authors: Ye Haijun , Li Meihong , Yang Zhe 
Published: December 2023

Abstract
Aiming at the influence of time delay on the combat effectiveness of aircraft fleet under the command of airborne warning and control system (AWACS), the process of beyond visual range air combat under the command of AWACS is analyzed, as well as the time delay characteristics in the combat information flow. The air combat situation threat of the aircraft by enemy aircraft is represented by the weighted fusion of the speed threat, angle threat, distance threat, and height threat of the aircraft. The threat matrix is proposed to represent the threat to the whole aircraft fleet. The threat matrix consists of the situational threat between each of our aircraft and each of the enemy aircraft. And the threat matrix of both sides is calculated to obtain the pre-enemy launch probability of both sides. With the two-step adjudication method and capturing the target probability of the missile seeker under the influence of time delay, the probability and number of being destroyed are calculated, as well as the combat effectiveness ratio. The opposing forces of both sides are set, and the calculation results in Matlab are consistent with the actual ones, which verifies the rationality and validity of the model, and can provide a theoretical reference for determining the time accuracy of the air-based network.
A Threshold Design Method of Aircraft Sensor Fault Detection Monitor
Authors: Yang Xiaxie , Xue Ying 
Published: December 2023

Abstract
A design method is proposed based on probability and statistics to solve the issue that the contradiction between false alarm rate and missed detection rate of sensor comparing monitor threshold definition. The sensor tracking error probability density function is deduced based on the probability, the false alarm rate and missed detection rate are calculated based on the different monitor threshold. Then a criterion is provided in according with sensor failure rate, aircraft dispatch reliability and monitor failure rate. In order to verify it, a quad redundant rate gyro used on aircraft is analysed and an advanced comparing monitor threshold is calculated. Comparing with the original threshold, the monitor coverage rate with the new threshold is increased 1.42 times than the original one. The actual flight date is researched to verify that the monitor failure rate reach to the minimum value 3.91*10-07/Fh which decrease one order of magnitude comparing with the original one 3.5*10-06/Fh. It could be verified that this method could achieve the balance between the safety and dispatch reliability requirement.
A High Lift Test System Based on Wing Deformation
Authors: Li Aixian 
Published: December 2023

AbstractIn the existing ground verification test of the high lift system, the flap and slat support structure and transmission system support structure are firmly connected with the fixed test platform, which cannot simulate the effect of real wing deformation on the high lift system. In this paper, a series of lifting devices are used to replace the flap and slat structure and transmission shaft mounting surface on the real wing. Through the position control of the lifting devices, the position change of the mounting surface can be realized, which can better simulate the influence of the real wing deformation on the high lift system.
Research on key technologies of scaled model flight testing
Authors: Kong Chuihuan , Pan Lijun , Wu Dawei , Ma Rubing , Cheng Changfu , Lou Yunwen 
Published: December 2023

Abstract
The scaled model flight test is one of the three major technical paths of aerodynamic research, which can be used to study and verify the aerodynamic characteristics, danger boundary, new layout, and new technology of the prototype, with the advantages of short cycle, lower risk, and lower cost. Due to different experimental research purposes, there are different design ideas and schemes for scaled models. With the technological development of power systems such as microturbine engines and electric ducted fans, the scaled model has experienced the stages of non-powered drop flight, rocket-assisted flight, and power-driven free flight. In this paper, two scaled verification models are introduced, the similarity criteria of the scaled model are analyzed, the selection of micro engine is carried out, the ground test methods such as fuel consumption test and moment of inertia test are summarized, some test subjects and results are presented, and the key technologies of the flight test of the scaled model are summarized. The flight test results show that the test method can accurately reflect the aerodynamic characteristics and flight performance of the prototype.
Online evaluation method of resistance spot welding quality based on locally linear embedding algorithm
Authors: Zhou You , Pan Chunrong , Chen Junjie , Gan Yufeng , Gao Xiangdong 
Published: December 2023

Abstract
To address issues of low efficiency, poor feedback timeliness, and unsuitability for fast-paced, high-volume manufacturing of the traditional quality inspection methods of resistance spot welding, an online evaluation method of resistance spot welding quality based on a locally linear embedding algorithm is studied for mild steel resistance spot welding to achieve cost reduction and efficiency improvement. During welding tests, voltage and current were simultaneously collected to calculate the welding power signal. We study the variation pattern of the dynamic power curve. The dynamic power signal was subjected to locally linear embedding and manual feature extraction. The collected features were then used as input to build random forest models and CatBoost models for the online weld quality evaluation, respectively. The results show that the classification models with the feature volumes constructed by locally linear embedding as input have higher assessment accuracy than manually extracted features. The locally linear embedding method can effectively eliminate the subjective influence brought by manual extraction and has better reliability. The CatBoost model based on the locally linear embedding method using the welding power signal can quickly and effectively achieve online quality assessment of mild steel spot welding, providing a further breakthrough in spot welding quality evaluation technology.
Trade Study of Engine Installation Position for a Rear-mount Aircraft
Authors: Chai Xiao , Si Jiangtao , Liu Kaili , Zhong Yuan 
Published: December 2023

Abstract
The meticulous analysis of large bypass ratio engine installation constitutes a vital foundation for the integrated design of civil aircraft engines. To holistically evaluate the performance implications between the engine and the airframe, a trade design concerning the engine installation position for a rear-mounted regional aircraft is conducted by utilizing computational fluid dynamics, incorporating a powered nacelle to account for the engine’s intake and exhaust ramifications. The engine’s longitudinal, spanwise, and vertical positioning impacts on aircraft drag and installed net thrust were discerned. The nacelle’s longitudinal displacement exerts the most substantial influence on the aggregate aircraft gain. The optimal configuration, achieved by advancing the engine 500 millimeters forward, yields a drag advantage of 2.24 counts and a thrust augmentation of 0.49 counts, culminating in a combined gain of 2.73 counts.
Considering lateral bending and torsion coupling in shimmy analysis of the nose landing gear
Authors: Zhang Peng , Zhu Dabin , Dong Huli , Wang Zeng , Wang Jiaao , Chen Xiying 
Published: December 2023

Abstract
This paper focuses on the shimmy damper performance of nose landing gear and aims to establish and amend a five-dimensional dynamic model of nose landing gear. The study compares the shimmy damper performance of nose landing gear whether considering lateral bending and torsional vibrations coupling and concludes that the amended model provides greater accuracy. In addition, the research compares the shimmy performance of passive and active shimmy dampers, finding that the active shimmy damper significantly outperforms the passive one in terms of efficiency. The amended model is also shown to improve the shimmy damper performance of active shimmy damper.