Simulation research on positioning acquisition of field rescue equipment based on LoRaKou, Pengfei; Chen, Mingyao; Wang, Fei
doi: 10.1088/1742-6596/2364/1/012060pmid: N/A
Timely and accurate acquisition of the position information of people in distress in the field is an important prerequisite for successful rescue. This paper analyzed the main positioning means of the current call equipment and the research status of LoRa technology in the position information acquisition of the current call equipment. The author proposed a method to obtain the position information of field rescue equipment based on LoRa, and simulated it in NS3 network simulator. This scheme can meet the requirements of high positioning accuracy, long communication distance and long standby time of field rescue equipment, and has high value on practical application.
Formation of H2CO and CH3OH in the Protoplanetary DisksXiao, Lin; Liu, Xia; Zhang, Li
doi: 10.1088/1742-6596/2364/1/012045pmid: N/A
It is known that the complex organic molecules in planetary systems may be formed by the organic chemistry of gases and particles in protoplanetary disks. Among these molecules, H2CO and CH3OH are potential precursors of essential organic compounds like glycolaldehyde. We calculate the physical and chemical structures of the protoplanetary disks around LkCa 15 and MWC 480 stars, compare the obtained column densities with the observed values. Our results mostly show reasonable agreements with observations. We identify the formation of H2CO to be through the both gas-phase and dust surface reactions, while CH3OH is dominantly formed by surface chemistry in the original astrolabe and then released into the gas-phase by surface exothermic chemical reactions in the LkCa 15 disk. We studied the synthesis of complex organic molecules (NH2CHO and CH3OCHO) in the protoplanetary disk to predict the observable species and Molecular abundance. In the disks around LkCa 15 and MWC 480 stars, we suggest that the strong spectral line observation of NH2CHO belonging to band 4 may obtain good results with ALMA, the observation of CH3OCHO may be challenging.
Research on space construction and selection method of space-based information support equipmentChang, Qing; Liu, Desheng; Yang, Yang
doi: 10.1088/1742-6596/2364/1/012001pmid: N/A
With the rapid development of information technology and space technology, the important position of space-based information support equipment is increasingly prominent. However, the increasing types and quantities of space-based information support equipment also put forward higher requirements for the formulation of combat plans, decision-making and deployment of combat equipment. In this paper, based on the seven-step method, an ontology construction method suitable for space-based information support equipment is proposed, and the ontology construction tool Protégé is used to realize the ontology modeling of space-based information support equipment. By acquiring open source satellite data, the knowledge map construction tool Neo4j is used to construct the knowledge map of space-based information support equipment. Finally, the space-based information support equipment conforming to the combat mission can be obtained to provide assistance for the formulation of the combat plan and the decision of equipment utilization.
Dynamic Response Analysis of the Aircraft Exposed to the Lateral Travelling GustJing, Zhiwei; Tang, Chu
doi: 10.1088/1742-6596/2364/1/012024pmid: N/A
The travelling gust from detonation is an interesting and severe excitation for a flying aircraft, and it is characterized by high emanating speed and takes strong energy. Previous investigations on the dynamic response characteristics of the aircraft in the tail-on or head-on travelling gust have been carried out. This paper focuses on the lateral travelling gust and its influence on the dynamic response of the aircraft. Based on conventional flight dynamics equations, the dynamics modelling and simulation technique of the rigid aircraft exposed to the lateral travelling gust is established. By employing the static pressure distributions, one quasi-steady aerodynamics computation method is presented to determine the aerodynamic force and moment on the aircraft in the travelling gust. Simulation results show that the approach presented in this paper is effective and can deal with the engineering requirement. Results also indicate that the enveloping process of the travelling gust increases the aerodynamic moment of the x-axis significantly and subsequently influences the dynamic responses along the x-axis.
Research on modular scheme of aviation emergency rescue for natural disastersLi, Yueyue; Liu, Zhenlei; Chen, Keyu; Qi, Ji; Li, Chuang
doi: 10.1088/1742-6596/2364/1/012030pmid: N/A
Aviation emergency rescue is the core part of China's emergency rescue system and the main rescue force, which plays an important role in disaster relief, rescue materials transfer, casualty transportation, air rescue, major health and epidemic prevention. Based on H145 helicopter, the modular design concept is adopted to redesign the aviation rescue equipment, and the modular structure layout of the cabin is completed for major natural disasters. Aiming at the path planning problem of rescue helicopter, based on the improved ant colony algorithm, the optimal path planning of helicopter is completed by comprehensively considering the constraints of helicopter flight performance and flight environment. Through the use of medical data interaction technology, a standardized transport information service platform is established, which solves the problem of medical information island between the transfer unit, the transport unit and the evacuation hospital when the helicopter performs the aviation emergency rescue task, realizes the interconnection of medical data, effectively shortens the response time of aviation emergency rescue and improves the rescue efficiency.
Prefacedoi: 10.1088/1742-6596/2364/1/011001pmid: N/A
The International Conference on Aerospace, Aerodynamics and Mechatronics Engineering (AAME 2022) was successfully held on July 29, 2022 in the form of online conference. AAME 2022, mainly focusing on the latest research on “aerospace engineering” and “mechatronics engineering”, gathered scholars, researchers and related practitioners in this field to share research results, explore current hot news, and exchange new ideas, providing a face-to-face communication for all participants in the struggling period of COVID-19 pandemic.We were delighted and honored to invite Prof. Ian R. McAndrew from Capitol Technology University, USA to serve as our Conference Chair. There were 90 individuals and enterprises all over the world attending the conference. Divided into three parts, the conference agenda covered keynote speeches, oral presentations, and online Q&A discussion. Firstly, keynote speakers were each allocated 30-45 minutes to hold their speeches. Then in the oral presentations, the excellent papers we had selected were presented by their authors by turns.During the conference, four sophisticated professors were invited to address keynote speeches. Among them, Prof. Bing Li from Northwestern Polytechnical University, China delivered a speech on the topic: Extraordinary Elastic-Wave Control Based on Metamaterials and Metasurfaces. In this report, a series of elastic metamaterials and metasurfaces used for broadband vibration-suppression and extraordinary wavefront manipulation were introduced, a variety of novel elastic-wave manipulations were realized, and the proposed designs paved feasible ways for noise and vibration control in elastodynamics. Additionally, Prof. Ian R McAndrew from Capitol Technology University, USA gave a report on Cybersecurity Issues in the Aerospace Industry. He presented to us the findings from several aligned research projects that focused on the cyber issues, challenges and risks involved at present and in the future. The subjects of safety and risk were presented with unique findings and recommendations on what was the need to prioritize. The wonderful and dramatic speeches of each keynote speaker had triggered heated discussion. Moreover, every participant praised this conference for disseminating useful and insightful knowledge.After months of well preparation and hard work, the proceedings of AAME 2022 covering a bunch of papers is smoothly published. These papers feature but are not limited to the following areas: Rocket Theory and Design, Communication Systems and Technologies, Interoperability, Synthetic Aperture Radar Technology, etc. All the papers have been checked through rigorous review and processes to meet the requirements of publication.On behalf of the conference organizing committee, we would like to express our heartfelt appreciation to all the keynote speakers, peer reviewers, and all the participants. In particular, we would like to acknowledge the Journal of Physics: Conference Series, for the hard work of all the colleagues in publishing this paper volume. We firmly believe that all the attendees have had fruitful discussions and gained valuable knowledge, and will enjoy the opportunity for future collaborations.List of Committee member is available in this Pdf.
Comparative study on the performance of turbulence models in flow separation of large expansion ratio nozzleWang, Le; Tian, Zhengyu; Yu, Hang; Zhang, Ye; Li, Hua
doi: 10.1088/1742-6596/2364/1/012035pmid: N/A
The asymmetry of flow separation inside the nozzle with large expansion ratio is the main factor for the generation of side-load in the engine, so the accurate prediction of the flow separation is of great significance. The turbulence model is the key to the prediction, but in different scenarios, the performance of the turbulence model can introduce huge uncertainties. In this paper, a typical thrust-optimized nozzle (VOLVO-S1) is simulated and analyzed for three widely used turbulence models: SST k - ω 、 RNG k - εand Spalart-Allmaras model. The results show that all these models can effectively predict the mode of shock separation phenomenon. The comprehensive performance of SST k - ωis the best; The Spalart-Allmaras model has better prediction performance under low pressure ratio, and the RNG k - εmodel has better prediction effect under high pressure ratio.
Study on the Influencing Factors of Modal Transformation of Continuous Rotating Detonation Wave PropagationShu, Chen; Lin, Wei; Yan, Chenglong; Shi, Qiang
doi: 10.1088/1742-6596/2364/1/012012pmid: N/A
In order to study the propagation mode of rotating detonation wave, the detailed reaction mechanism of hydrogen-oxygen with 9 components and 19 steps is used, and the finite rate chemical reaction model is used for numerical calculation. After ignition, there is a stable collision period in the flow field for a certain period, and the collision extinguishing and new detonation wave generation occur during the mode conversion. By adding nitrogen or argon to the hydrogen-oxygen mixture for dilution, when the dilution ratio increases, the activity of the gas mixture decreases, the height of the combustible gas layer increases, and the temperature of the combustion product after the detonation wave decreases away from the head of the detonation wave, which will reduce the mixture that is burned in advance. There are different degrees of reflected shock at the outlet of the combustion chamber, and the upward detonation wave will cause the height change of the detonation wave head and the instability of the flow.
Analysis of the Attachment Process of Bionic Spines Based on the Coupling of Discrete Elements and Multi-body DynamicsLiu, Ran; Li, Yu Xin; Luo, Haitao; Yu, Miao
doi: 10.1088/1742-6596/2364/1/012006pmid: N/A
As the only natural satellite of the Earth, the Moon has profound significance for deep space research, and the undifferentiated lunar rock core plays a key role in the investigation of the origin of the Moon. In recent years, there have been numerous deep space sampling techniques, but all of them are at the cost of destroying the sample, while drilling can retain the sample in its original state to the maximum extent. In this paper, based on the reference of the claw spine attachment device at home and abroad, the theoretical modeling of the claw spine piece which plays the role of grasping and attaching is carried out, and the simulation analysis is carried out by the coupling method of discrete element and multi-body dynamics, which provides important guidance for the subsequent experi-ments and the optimized design.
Design and Simulation of a Position and Average Velocity Closed-loop Control Method of a Hydraulic Servo SystemMao, Xuyao; Duan, Wei; Xiang, Chao; Wu, Chao; Wang, Ze
doi: 10.1088/1742-6596/2364/1/012061pmid: N/A
A concise position and average velocity closed-loop control method based on PID ofvalve controlled hydraulic systems is proposed for both positional precise control and averagevelocity precise control. First, set the target position and the target average velocity; secondly,the average velocity closed-loop control is preferentially carried out at start-up; thirdly, switchto the position closed-loop control circuit when the ratio of the actual position to the targetposition reaches a critical value; at last, adjust the PID parameters to a proper configuration.The simulations show that this method can acquire both the position and the average velocitycontrol with sufficient accuracy at the same time, in which the position deviation can be lessthan 0.001% and the average velocity deviation is 2.08%. In addition, the simulations indicatethat the system can maintain almost the same precision of the position control and the averagevelocity control by adding an external load as a disturbance item.