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Research on Pulse Linear Array LiDAR Point Cloud Enhancement Algorithm in Snowy Environment 4

Research on Pulse Linear Array LiDAR Point Cloud Enhancement...

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4th International Conference on Defence technology, ICDT 2024

作者： Shi, Xiaolong Gao, Mingze Wu, Yanjiang Wang, Weihan Wang, Fengjie Han, Shaorong Chen, Huimin Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China Shanghai Radio Equipment Research Institute Shanghai201109 China

LiDAR point cloud data acquisition is difficult in snowfall environment, which leads to fewer point cloud datasets in snowy days and affects the subsequent research on target recognition algorithms in bad weather. In this paper, we investigate a point cloud enhancement algorithm based on pulse linear array LiDAR in snowfall environment. We use a linear array data acquisition method to collect the point cloud data of sunny and snowy days, and the point cloud data of sunny days and different degrees of snowy days are compared. We establish a linear array pulse LiDAR acquisition model and a single-line laser snowfall simulation model. The results show that a large number of snow particles gather in the vicinity of pulse linear array LiDAR and they are conical in distribution. The simulation model can generate point cloud data close to the real snow environment. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Snow

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Characterization of laser power on additive manufacturing of heterostructure parts 4

Characterization of laser power on additive manufacturing of...

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4th International Conference on Defence technology, ICDT 2024

作者： Li, Shiyi Feng, Hengzhen Lv, Sining Kan, Wenxing Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing Institute of Technology Beijing China Chongqing Innovation Center Beijing Institute of Technology Chongqing China

In order to meet the demand for low-cost and rapid prototyping of micro-small parts for highly dynamic microsystems, metal additive manufacturing technology has become one of the important means of manufacturing heterogeneous parts. In this paper, the residual stress and deformation generated by the rapid prototyping process of micro-small and complex parts under different laser frequencies are firstly simulated and analyzed, and then in order to check the resistance of the parts to high overload, the densities and hardnesses of the printed parts are experimentally tested. The results show that, on the basis of ensuring that the powder can be fully melted, the lower laser power, the smaller residual stress of the micro-small complex parts, the smaller deformation of the parts caused. The physical energy density also shows a certain correlation to the density and hardness of the specimen, the higher physical energy density, the higher density and hardness of the specimen. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Brinell Hardness

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Simulation and experimental study of capacitive sensors for penetration fuze 9

Simulation and experimental study of capacitive sensors for ...

引用

9th International Conference on Energy Materials and Electrical Engineering, ICEMEE 2023

作者： Zou, Qipeng Sui, Li Zhang, Meiyun Shi, Gengchen Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China Northwest Industries Group Co. Ltd Xi'an710043 China

ISBN: (纸本)9781510672765

More and more important military facilities and command centers have been moved underground or protected with bunkers, so penetration munitions for such targets have become one of the important research directions for military equipment research institutes in various countries. The penetration fuze is a key part to achieve efficient destruction of penetration munitions, but the current high g accelerometers which are widely used in the penetration fuze have problems, such as the output signal mixing with the structural response of the projectile and noise signals, signal sticking and so on. In order to solve these problems, we designed a kind of capacitance sensor for penetration fuze. This paper further designed a signal processing circuit for the sensor, and the simulation and hammering tests were conducted to verify that the capacitive sensor for the penetration fuze can effectively suppress the structural response of the projectile and noise interference, and the signal sticking phenomenon can be reduced under the working condition of the penetration multi-layer target plate. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Sensors Signal processing Capacitance Accelerometers Elasticity Interference (communication) Weapons Reflection Simulations

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Multisensor-Based Maneuvering Target Tracking Algorithm under Non-Gaussian Measurement Noise 3

Multisensor-Based Maneuvering Target Tracking Algorithm unde...

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3rd International Conference on Defence technology, ICDT 2022

作者： Zhou, Yu Qin, Jianxin Zha, Bingting School of Mechanical Engineering Nanjing University of Science and Technology Nanjing210094 China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an710065 China

The UAVs have become a huge threat in the battlefield. The excellent maneuverability makes them competent for the actual combat operations such as investigation and strike. Therefore, accurate tracking of UAVs is critical. Centralized radar/IR fusion system has been widely concerned to track the UAVs because of the complementary characteristics between these two sensors. The appearance of non-Gaussian measurement noise produces a negative impact on tracking accuracy. This paper proposes a novel IMM-CMCSCKF algorithm which can improve the tracking accuracy of radar/IR fusion system for maneuvering target under non-Gaussian measurement noise. The heterogeneous measurements from radar and IR are firstly fused. Then, CMCSCKF algorithm is presented based on MCC to deal with non-Gaussian measurement noise. To improve maneuvering target tracking accuracy, CMCSCKF is embed into IMM algorithm. Numerical simulation verifies the effectiveness of the proposed IMM-CMCSCKF. © Published under licence by IOP Publishing Ltd.

关键词： Gaussian distribution

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A STUDY OF CAPICITANCE CHARACTERS OF METAL MICRO-HEMISPHERICAL RESONANT GYRO DETECTION 10

A STUDY OF CAPICITANCE CHARACTERS OF METAL MICRO-HEMISPHERIC...

引用

10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Yao, Xiangxian Su, Zhong Gu, Xibing Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

Compared with the traditional quartz hemispherical resonant gyro, the metal micro hemispherical resonant gyro has a stronger high overload capacity and can adapt to more extreme environments, and its capacitance characteristics directly determine the performance of the metal micro hemispherical resonant gyro. In this paper, an oscillator with a diameter of 12 mm is selected, and the capacitance characteristics of the metal micro hemispherical resonant gyro are studied in detail from the two influencing factors of the number of oscillator teeth and capacitance spacing. The finite element simulation of the oscillator has been carried out using finite element software and the capacitive characteristics have been simulated and analyzed. The results show that when the number of teeth of the oscillator is 16 teeth and the capacitance spacing is 0.05 mm, the excited area is enhanced by 460% and the capacitance value increases to 10 pF. This study provides an important theoretical basis for the capacitance design of the resonant gyro with a metal micro hemisphere. © The Institution of Engineering & technology 2024.

关键词： Gyroscopes

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EQUIVALENT CONDUCTIVITY MEASUREMENT METHODS FOR MIXED NON-HOMOGENEOUS MEDIA 10

EQUIVALENT CONDUCTIVITY MEASUREMENT METHODS FOR MIXED NON-HO...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Sun, Zhenzhen Su, Zhong Li, Fei Zhang, Zhicheng Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

Aiming at the problems of complicated electrode deployment and uncertain measurement range under a non-uniform medium in the "current-voltage" four-terminal method of conductivity measurement, a two-electrode equivalent conductivity measurement method based on the ground current field transport model is proposed. The "air-ground" layered medium ground current field transmission model is constructed, the equivalent conductivity model is further derived, the model error is corrected, and the simulation results show that the measurement accuracy of the uniform medium reaches 99%;the measurement results of the mixed non-uniform medium are in line with the theory;the dielectric conductivity increases firstly with the increase of the medium volume and then tends to be stable, and the measurement range of conductivity can be roughly determined accordingly. Under the two dry clay and soil environments, the measurement results are consistent with the soil EC value detector, which meets the application requirements. © The Institution of Engineering & technology 2024.

关键词： Electric conductivity measurement

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STUDY ON THE MEASUREMENT METHOD OF GROUND CONDUCTIVITY OF INJECTED GROUND CURRENT FIELD 10

STUDY ON THE MEASUREMENT METHOD OF GROUND CONDUCTIVITY OF IN...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Ling, Zhongao Su, Zhong Zhao, Hui Wang, Yanke Cu, Sirui Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

The injected ground field technology is crucial for personnel localization and communication in complex geological environments, and accurate acquisition of ground conductivity information is a matter of communication quality and positioning accuracy. Aiming at the limitations of the traditional four-terminal electrode method of laying electrodes, this paper proposes a ground conductivity measurement method with non-linearly laid electrodes. The feasibility of the method was verified and analyzed in a numerical simulation environment. The results show that the method has good feasibility and accuracy, but attention should be paid to the effect of electrode asymmetry on the measurement results in the case of close distance between the detection electrode and the injection electrode. In the field measurement experiments, the standard deviation of the measured data of this method is less than 0.55 us/mm, and the maximum relative error is not more than 8.82%, which is able to meet the needs of the actual project, and provides a feasible solution for the measurement of conductivity under the complex geological environments, especially when the application of the traditional four-terminal electrode method is limited. © The Institution of Engineering & technology 2024.

关键词： FINITE ELEMENT NUMERICAL SIMULATION FOUR-TERMINAL ELECTRODE METHOD GROUND CONDUCTIVITY GROUND CURRENT FIELD NONLINEAR ELECTRODE PLACEMENT

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A STUDY OF THE CHARACTERISTICS OF THE INFLUENCE OF THE PRECESSION FACTOR OF AN ALL-METAL MICRO-HEMISPHERICAL RESONATOR 10

A STUDY OF THE CHARACTERISTICS OF THE INFLUENCE OF THE PRECE...

引用

10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Gu, Xibing Su, Zhong Yao, Xiangxian Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

The precession factor of resonant gyro is the key performance index of gyro sensitive angular velocity, and the main factors affecting the precession factor are the structural parameters of the resonator. In this paper, an all-metal micro-hemispherical resonator with a radius of 3mm is taken as the research object, the expression of the precession factor of the hemispherical resonator is established, and the intrinsic frequencies under different modal orders are obtained through the finite element simulation experimental method, and the influences of the radius of the hemispherical shell, the thickness of the shell, the diameter of the central axis rod, and the radius of the inner fillet angle on the precession factor of the resonator are analyzed. The experimental results show that the size of the inner fillet radius has a significant effect on the precession factor, and the precession factor of the metallic micro-hemispherical resonator is mainly maintained at 0.2980 with a variation range of less than 1%. This study provides reference data for the optimization of the structural parameters of the all-metal micro-hemispherical resonator. © The Institution of Engineering & technology 2024.

关键词： Gyroscopes

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RSSI-BASED INJECTED GROUND CURRENT FIELD LOCALIZATION STUDY 10

RSSI-BASED INJECTED GROUND CURRENT FIELD LOCALIZATION STUDY

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Chu, Sirui Su, Zhong Wang, Yanke Ling, Zhongao Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

Aiming at the problem that traditional positioning techniques are easily limited in complex environments, this study proposes a positioning method based on Received Signal Strength Indication (RSSI) of injected ground current field, which is suitable for closed or sheltered environments, such as underground alleyways, and also works effectively under extreme conditions, such as alleyways collapsing. Firstly, the validity of the ground current field signals is tested to ensure that the signals are reliable;secondly, the extracted signals are screened to remove signals with low signal-to-noise ratios and high ground resistance, and to reduce the influence of environmental noise on the localization results;next, the RF parameter A as well as the signal transmission constant n are computed using the linear regression least square method, which provide important fitting parameters for the subsequent establishment of the RSSI localization model;finally, a Gaussian filtering to process the RSSI data collected by modelling. The experimental results show that the method achieves the positioning of underground alleyways environment with good feasibility and effectiveness, and provides a feasible solution for carrying out efficient alleyway personnel positioning and rescue operations, which has important theoretical significance and practical value. © The Institution of Engineering & technology 2024.

关键词： Linear regression

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Study on the Monitoring and Analysis Method of the Working Efficiency of Torsional Impactors 29th

Study on the Monitoring and Analysis Method of the Working E...

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29th International Conference on Computational and Experimental Engineering and sciences, ICCES 2023

作者： Zhang, Tao Liu, Daixuan Xie, Xue Li, Yumei Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100101 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100101 China

ISBN: (纸本)9783031425141

The torsional impactor converts the kinetic energy of the drilling fluid into fixed-frequency mechanical circumferential vibration, which can effectively suppress the drilling stick–slip phenomenon and increase the mechanical drilling speed. However, due to various factors such as its performance, formation lithology, and construction parameters such as weight of bit and displacement, it is not possible to effectively monitor and evaluate the working condition and performance of the torsional impactor in the well by relying on surface observation data. In this paper, the torsional impactor is connected to a near-bit measurement tool to form a torsional impactor monitoring system. By experimentally measuring the vibration, rotational speed, bit weight, and torque data of the torsional impactor during operation, the data features are extracted by combining the time domain and frequency domain analysis methods to monitor the operating impact frequency of the torsional impactor and analyze the influence of different drilling parameters on the working efficiency of the torsional impactor. The analysis results show that this study can achieve the monitoring of the working status and working efficiency of the downhole speed lifting tool, which is beneficial to the optimization design of the speed lifting tool and the improvement of the working efficiency. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Condition monitoring

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