bluuebunny/crossref_metadata_2025_split huggingface dataset:
Efficient few-body calculations in finite volume
Authors: König S 
Published: March 2023

Abstract
Simulating quantum systems in a finite volume is a powerful theoretical tool to extract information about them. Real-world properties of the system are encoded in how its discrete energy levels change with the size of the volume. This approach is relevant not only for nuclear physics, where lattice methods for few- and many-nucleon states complement phenomenological shell-model descriptions and ab initio calculations of atomic nuclei based on harmonic oscillator expansions, but also for other fields such as simulations of cold atomic systems. This contribution presents recent progress concerning finite-volume simulations of few-body systems. In particular, it discusses details regarding the efficient numerical implementation of separable interactions and it presents eigenvector continuation as a method for performing robust and efficient volume extrapolations.
Microscopic Optical Potentials: recent achievements and future perspectives
Authors: Finelli Paolo , Vorabbi Matteo , Giusti Carlotta 
Published: March 2023

Abstract
Few years ago we started the investigation of microscopic Optical Potentials (OP) in the framework of chiral effective field theories [1, 2] and published our results in a series of manuscripts. Starting from the very first work [3], where a microscopic OP was introduced following the multiple scattering procedure of Watson [4], and then followed by Refs. [5, 6], where the agreement with experimental data and phenomenological approaches was successfully tested, we finally arrived at a description of elastic scattering processes off non-zero spin nuclei [7]. Among our achievements, it is worth mentioning the partial inclusion of three-nucleon forces [8], and the extension of our OP to antiproton-nucleus elastic scattering [9]. Despite the overall good agreement with empirical data obtained so far, we do believe that several improvements and upgrades of the present approach are still to be achieved.
In this short essay we would like to address some of the most relevant achievements and discuss an interesting development that, in our opinion, is needed to further improve microscopic OPs in order to reach in a near future the same level of accuracy of the phenomenological ones.
Influence on Harmonic Reducer Coaxiality to Transmission Efficiency of Solar Array Driving Mechanism
Authors: Tan Honggen , Wang Jie , Huang Xiaochu , Han Zili 
Published: March 2023

Abstract
In order to ensure the stability and reliability of the assembly performance of the solar array driving mechanism, research on the influence of assembly and adjustment coaxiality of harmonic reducer to transmission efficiency of solar array driving mechanism was carried out. With the research, the assembly and adjustment coaxiality mode of the harmonic reducer was analyzed. The driving mechanism simulator and harmonic reducer test piece were developed. Based on a piece of special test equipment, a fully systematic test was carried out. According to the characteristics of different products, the assembly and adjustment coaxiality parameters of harmonic reducer can be accurately and reasonably formulated. The best transmission efficiency of the solar array driving mechanism has been achieved. The on-orbit stable operation of the solar array was effectively ensured.
Research on FPGA Functional Reliability based on Petri Net
Authors: Cheng Yongsheng 
Published: March 2023

Abstract
Engineering reliability ground verification for space FPGA devices is one of the important aspects of space load digital system design. At present, there are three methods: code correctness verification, system functional test, and formal verification. Based on the Petri Net theory, this paper proposes a macroscopic and accurate description of the functional characteristics of FPGA engineering with the functional module as the granularity and the control variable as the core. On this basis, combined with the state-reachability graph theory, functional execution reliability is proposed. This evaluation method evaluates the degree of influence of the core control data error on the execution of the system function in a workflow and provides a new basis for the improvement of the protection method and the evaluation of the protective effect.
Aircraft Panel Sound Insulation Testing Techniques and Optimization of Sound Insulation Characteristics
Authors: Zhang Shenghai 
Published: March 2023

Abstract
As the safety of aircraft increases, aircraft comfort is becoming an increasing concern, with aircraft cabin noise being one of the main factors affecting aircraft comfort. To ensure the comfort of the aircraft, it is, therefore, necessary to reduce cabin noise and to ensure that its volume is within an appropriate range. The sound insulation performance of aircraft panels is a key indicator in determining aircraft cabin noise. Based on experimental sound insulation testing techniques, this paper performs tests on the sound insulation of typical panel constructions. Then possible measures to improve the sound insulation performance are discussed with ARJ21 fuselage panels as an example. Results show that the addition of acoustic wool and honeycomb decorative panels, as well as the necessary sealing treatment, can effectively improve the sound insulation capacity of the panels.
Analysis of the Present Situation of the Aerodynamic Stability of Transportation Vehicles
Authors: Fang Tianyang , Shi Yanting , Xu Chang 
Published: March 2023

Abstract
The rise and development of the knowledge of aerodynamics and fluid mechanics have solved many key problems in the engineering field, and have been applied in life. For example, in the aspect of vehicle appearance design, the appearance is often designed to be streamlined to reduce the impact of air resistance on cars in the process of moving forward, and the friction between fluid and aircraft, submarines, and other common appearance designs are considered. It can be seen that the application of fluid mechanics has brought great changes to life. To help reduce air resistance and improve the aerodynamic stability of vehicles, this paper attempts to investigate and summarize the existing improvements in vehicle design. At the end of the paper, a list of pre-designs for automobiles, trains, and aircraft is given, and the applicability of these designs is commented. The review can help the public to understand the cutting-edge improvements in modern vehicle design.
Design of Double Closed Loop Control System for DC Motor Based on TX8C1010 Single Chip
Authors: Wang Zhouyi , Yu Jianding , Lou Yuanchao 
Published: March 2023

Abstract
In order to improve the operational strength and control precision of the DC motor, a double closed-loop control system based on TAIXIN TX8C1010 MCU is proposed. The single chip is based on a high-speed 8051 core, which is applied to home appliances and can realize the double closed-loop motor control algorithm. The given speed value provided by the potentiometer is compared with the real-time speed value and inputs the error to the speed loop function, which is based on the incremental PID algorithm, to calculate the reference current value. Then it is compared with the real-time current value and inputs the error into the current loop. The PWM signal duty cycle is determined by the output value of the current loop to adjust and stabilize the motor speed. The drive circuit outputs the PWM signal in the inverse amplification way to control the operation of the DC motor, and finally tests the function on the MAGTROL M-TEST7 motor test platform. The test results show that the control system has fast response speed, strong load capacity, good robustness and safety. Hence, TAIXIN TX8C1010 single-chip machine is feasible in the DC motor control. It can be improved to strengthen its load characteristics according to the parameters and applied to a variety of power DC motor control.
Research on Dynamic Modeling Measurement and Control of Cable Traction Devices for Electro-Optical Unmanned Systems
Authors: Shen Cheng , Chen Yukang , Zhu Wenliang , Zhang Lianchao , Fan Dapeng 
Published: March 2023

Abstract
In order to realize the high-precision variable direction cable control of the electro-optical unmanned system in non-electromagnetic remote control, a cable traction device measurement and control with characteristics of variable direction traction, rapid installation, and lightweight portability were proposed. Fan-shaped connect rod mechanism and U-shaped groove fixed pulley group were added to it, which can realize multi-direction traction without derailment on the basis of the cable limit and alleviate the cable fracture caused by mechanical wear. Introducing Euler transformation and analyzing the dynamics of the cable, the whole operation process, and the tension detection model was established. A Kalman Filter traction planning method was proposed to solve the problems of inertia delay and emergency stop of the unmanned vehicles after a sudden direction change. In order to verify the effectiveness, an experimental platform for the cable traction system of a 50kg wheeled and 150kg tracked unmanned system was built for simulation and experimental testing. The results show that the cable system has good dynamic variable traction, which can meet the multi-terrain control ability of an electro-optical unmanned system in a complex field environment.
Study on Optimization of Chilldown Process for A New Generation Launch Vehicle
Authors: Zhang Qing , Ye Xin , Sun Yi-long , Zheng Yan , Xu Fei-ran 
Published: March 2023

Abstract
Focused on chilldown procedure of liquid oxygen filling for second stage of a new generation launch vehicle, the method of chilldown through liquid oxygen pump has been put forward and compared with traditional method that of gas pressurization. The results showed that it could reduce total time, lower system state changes, and improve efficiency and reliability of liquid oxygen loading operations. Aimed at liquid oxygen flow of chilldown through the pump, the model of liquid oxygen pump operating has been established by considering variable frequency, regulating valve opening and liquid level of vehicle tank. It can provide scientific guidance and basis for flow control of chilldown through the pump and liquid oxygen tests.
An Effective Small Electrodynamic Shaker Modeling Method
Authors: Li Jinpeng , Deng Ke , Wang Gang , Zhang Gangming , Bai Zhiqing , Yang Lu 
Published: March 2023

Abstract
Currently, the discussion on the modeling method characterized by the small electrodynamic shakers, especially the mathematic analytical method, is relatively sparse. In this paper, taking BK4809 as an example, a modeling method for small shakers based on analytical formulations is discussed. The detailed mathematical analysis and derivation process for the small shakers are performed, and the corresponding modeling formulations are concluded; then, the simulation tests are carried out in MATLAB. Through comparison with the reference data, the validation tests show that based on analytic formulations combined with the MATLAB built-in system identification functions, the results of modeling methods match well with the experiment data, and the concluded method is effective.
Research on the Controller Deployment Strategy of Aviation Information Network
Authors: Fu Haotong , Wang Xiang , Song Xinkang , Peng Cong , Zhao Shanghong 
Published: March 2023

Abstract
With the development of intelligent aviation platforms, Aviation Information Networks (AIN) has emerged as a promising architecture to accommodate various aviation missions. However, the current Airborne Ad Hoc Networks (AANETs) suffer from the challenges of tightly-coupled devices and complex aviation environments. To tackle the issues, the Software Defined Network (SDN) is introduced to manage the AINs by decoupling the control plane from the data plane and allocating the network resources logically. Considering the large-scale and dynamic changing characteristics of the AINs, we utilize the hybrid architecture consisting of multiple controllers to establish the control system. To construct the AIN of the SDN paradigm, the first issue that needs to be reckoned with is the controller deployment. This paper proposes a controller deployment strategy that includes network division and regional deployment. Firstly, the network is rapidly divided into areas according to the key performance indicators of the network, and then the platform with the highest reliability is selected as the controller to be deployed in each area. The experimental results show that the proposed algorithm has low computational complexity and can effectively improve the network performance in terms of average requirement delay, load balance index, controller deployment cost, and reliability, which is suitable for addressing the controller deployment issue in aviation scenarios.
Research on Cascading Effect Analysis of Civil Aircraft Inertial Reference System Parameters Failures
Authors: Wang Yuqing , Shi Zhijian 
Published: March 2023

Abstract
Inertial Reference System (IRS) is one of the important onboard systems; it can provide the attitude, heading, angle rate and accelerations, etc. to the display system, flight control system and other systems on the aircraft; and it can be the navigation source of the flight management system to provide the position data. The consequences of IRS parameters failure effects are difficult to determine. This paper applies the cascading effect analysis method to carry out IRS parameters failure safety assessment. A method is given to identify the initiating state of the IRS parameters. An initiating state of IRS parameters is taken as an example to analyze safety effects and obtain the aircraft-level safety classification. The safety classification is compared with source analysis to determine whether the aircraft safety requirement is met.
Optimization Design of the Wing of Cruise Missile on the Basis of the Vortex Lattice Approach
Authors: Fuzhen Shi , Jinrui Guo , Mingze Ren 
Published: March 2023

Abstract
Aerodynamic performance of missile wings is a vital factor affecting the endurance and combat effectiveness of cruise missiles. Given the current situation that the aerodynamic design of conventional cruise missile wings is less and there is more room for improvement, a missile wing shape with a winglet is considered designed to improve the cruise characteristics of cruise missiles effectively. Firstly, the EPPLER 66 is selected as the wing shape by the combination of vortex surface element approach batch calculation and CFD simulation analysis. According to the dimensional parameters of a typical patrol wing, the design variables and corresponding optimization intervals are determined, and the aerodynamic optimization is carried out by combining the genetic approach as well as the vortex lattice approach. CFD is used to verify the aerodynamic performance of the optimized wing. The calculation outcomes reveal that the optimized wing has a ratio of lift-to-drag of 23.43, which is 12.32% higher than that of the conventional flat wing.
Application of Cascading Effect Analysis Method in Air Data Failure Impact Grading
Authors: Qiu Zhifan , Wang Yuqing 
Published: March 2023

Abstract
Air data for civil aircraft provides important flight information and is the basis for guiding pilots to maneuver the aircraft. It is necessary to clarify the impact of air data failure on the aircraft and pilot operation. By formulating the principles of Cascading Effect Analysis(CEA) of air data failure, including failure scenario determination, direct impact judgment, indirect impact analysis, and comprehensive impact analysis of the whole aircraft, this paper studies the problem of grading the impact of air data failure based on CEA Method. The architecture of the air data system and the data voting logic, and the air data failure mechanism are analyzed so as to define the air data failure scenarios. Using CEA Method, this paper analyzes all the impacts of air data failure on aircraft systems iteratively, determines the impact on the whole aircraft and flight operations, and judges whether the impact results meet the analysis expectations.
Scheme Design and Simulation Analysis of Recoverable Rocket Based on Rotor
Authors: Tao Zhelun , Li Zechen , Yu Peng , Zhong Sheng 
Published: March 2023

Abstract
The reuse of rockets is one of the most important methods to reduce launch costs. Based on the design scheme of the “Roton” space helicopter, this paper proposes a recovery method for rockets - rotors, which can not only accurately control the landing posture but also have high fuel utilization. To recover the first stage of the rocket, this paper carries out the scheme design and sets up the landing deceleration action with the engine reverse thrust and rotor lift. The simulation result shows that the scheme allows the first stage of the rocket to land safely, which provides a theoretical reference for engineering development in the future.
Time-space intelligent management and dispatch of electric Beidou based on Beidou and digital twin technology
Authors: Su Zanyou , Lin Liming , Wang Yifei 
Published: March 2023

Abstract
Aiming at the increasingly complex management and dispatching problems of power system, this paper combines Beidou precise space-time technology with digital twin system theory, and puts forward a method of constructing intelligent management and dispatching platform of power grid. The method combines Beidou and IoT (Internet of Things) sensors to form a digital twin management and scheduling platform which can perform state prediction, fault diagnosis, self-healing and other functions. Firstly, this paper analyzes the overall architecture of Beidou digital power twin system, then discusses the construction method of digital twin in power system from the aspects of digital twin modeling theory, data acquisition intelligent terminal based on Beidou, operation mode of digital twin platform, etc. Finally, the application test analysis is carried out. The research results show that the method proposed in this paper has reference value for improving the management and dispatching capability of smart grid.
Study of the Hydraulic Characteristics of Slug Flow in the Microfluidic Y-shaped Junctions of Three Different Cross Angles
Authors: Han Yu 
Published: March 2023

Abstract
The slug flow in microchannels has been applied for microdroplet/bubble production in recent years. The comparison investigation of hydrodynamic properties of slug flow in three different Y-shaped microchannels was conducted by numerical methods. The numerical simulation results show that the VOF model can describe the velocity and pressure field in the Y-shaped microchannel. It was found that the pressure in the microchannel from upstream to downstream showed an overall decreasing trend, and the liquid phase pressure between the two gas slugs was less than the internal pressure of the adjacent gas slug. The midline pressure of the bubble generation moment is less than the rest of the state. Among the three Y-shaped junctions, the absolute value of the pressure difference at the moment of slug bubble formation is the smallest when the angle of the Y-junction is 90°. Compared to 120° and 90° Y-junctions, the pressure and velocity field of the 60° Y-junction is the most unstable when the slug flow generates.
Study of Near-field Acoustic Pressure in Near-coastal Ice-water Media Based on Angular Spectrum Method
Authors: Wang Chen , Zhang Hua 
Published: March 2023

Abstract
For seawater detection, acoustic means is currently one of the most promising technical means of development. According to the physical properties of acoustic waves, they can be effectively propagated in seawater and ice, and at the interface of different media, there will be reverse acoustic scattering. Using the theory of acoustic propagation in solids, the propagation velocity and refractive index of transverse and vertical, and taking the longitudinal wave as an example, we use the angular spectrum method to solve the fluctuation equation and obtain the beam angle spectrum. Numerical software simulation calculates the time domain characteristics of acoustic scattering at different incidence angles. The effect of evanescent waves on solid sound transmission is also considered. Considering the effect of apocalyptic waves on thin ice on the ocean surface, it provides a theoretical basis for further research on detecting offshore ice using acoustic methods.
Numerical Simulation Analysis of Flow Noise Characteristics of Underwater Vehicle
Authors: Leng Kaijing , Deng Leilei , Zhang Haozheng , Hao Shijia 
Published: March 2023

Abstract
Based on the standard large eddy simulation and k-epsilon model, the steady flow field and navigation flow noise of the underwater vehicle shell are simulated. In this paper, the underwater vehicle model is established by referring to classic SUBOFF model. The standard k-epsilon method is used to study the pressure distribution characteristic, velocity distribution characteristic, and velocity vector distribution characteristic on and around the shell of the underwater vehicle at different speeds. The results indicate that the pressure increases with the increase of the speed and in the bow of the shell is the largest. A large eddy simulation was used to analyze the noise characteristics of sailing flow at different speeds. The results show that the sound pressure level of navigation flow noise is higher in the low-frequency band, and will increase with the increase in speed.
Experimental Study on the Airborne Noise of Rain
Authors: Li Zekun , Liu Hengqi 
Published: March 2023

Abstract
Rainfall noise is investigated experimentally in this paper. The modern high-speed camera and microphone are employed to study both drop dynamics and sound signals. Sound signals produced by single-drop impacts on deep pools, thin liquid films, steel plates, and sandy surfaces were analyzed through a combination of videos and audio. Classical Fourier transforms are performed for converting the original signal to a power spectrum. Results show that in the deep-water cases, the noise is proved to be the entrapment of a tiny breathing bubble that sheds from the dimple. The dominant frequencies of droplets impacting water film, rigid walls, and sandy surfaces are much compared with deep pool cases.
Research on Robust CS-DOA Estimation Method Based on Signal Sparsity Reconstruction
Authors: Su Peilin , Huang Di , Zhu Jieqi 
Published: March 2023

Abstract
The application of compressed sensing theory in DOA estimation of underwater signals has always been difficult. Aiming at the slow operation speed of the current L1-SVD algorithm and the poor robustness under various conditions such as multi-array elements, this paper proposes an improved CS-DOA estimation algorithm combined with the greedy algorithm. The algorithm sparsely reconstructs the received signal itself, which effectively improves the strict sparsity of the processed signal. The feasibility of the new algorithm is proved through theoretical analysis and simulation experiments. Compared with the L1-SVD algorithm, the measurement performance under different conditions is significantly improved. It has development prospects in academic research and engineering applications.