西北工业大学学报最新文献_第3页

Study on failure of single-bolt double-lap composite joints based on test and numerical emulation 基于试验与数值模拟的单螺栓双搭接复合节点破坏研究

西北工业大学学报 Pub Date : 2023-06-01 DOI: 10.1051/jnwpu/20234130471

Yan Huang, Feixiang Ren, Puhui Chen

引用次数: 0

Optimal design of SMA linear actuation unlocking mechanism for CubeSat 立方体卫星SMA线性驱动解锁机构的优化设计

西北工业大学学报 Pub Date : 2023-06-01 DOI: 10.1051/jnwpu/20234130510

Peng Li, Juanni Yin, Jiaolong Zhang, Z. Gao, Heng Huang

{"title":"Optimal design of SMA linear actuation unlocking mechanism for CubeSat","authors":"Peng Li, Juanni Yin, Jiaolong Zhang, Z. Gao, Heng Huang","doi":"10.1051/jnwpu/20234130510","DOIUrl":"https://doi.org/10.1051/jnwpu/20234130510","url":null,"abstract":"In order to realize the reliable unlocking of solar arrays of a CubeSat under the strict constraints of space and power dissipation, a shape memory alloy(SMA) wire linear actuation unlocking mechanism is developed. Through using a spring-SMA structure, relying on the spring force locking, heating the SMA wire and producing a recovery stress drive pin movement, the solar arrays are unlocked. The mathematical model of the unlocking mechanism is established, and the relationship among stroke, unlocking time, power, alloy wire diameter and working voltage of the SMA unlocking mechanism is obtained through simulation. In order to optimize its overall unlocking time and power, the particle swarm optimization algorithm is used to optimize the diameter and working voltage of the alloy wire. The simulation results show that the SMA unlocking mechanism with the wire whose diameter is 0.5 mm has the best working performance when the driving voltage is 1.2 V. Finally, the experimental study of the design results shows that the unlocking time of the actuation unlocking mechanism is 3.2 s, its power is 3.55 W and that its pin-pulling stroke is 1.8 mm, being consistent with the simulation results. The unlocking mechanism has a high reliability, consistent working performance and good adaptability, therefore having passed various environmental tests and being successfully applied to a CubeSat in orbit.","PeriodicalId":39691,"journal":{"name":"西北工业大学学报","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48885970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on a class-incremental learning method based on sonar images 基于声纳图像的类增量学习方法研究

西北工业大学学报 Pub Date : 2023-04-01 DOI: 10.1051/jnwpu/20234120303

Xinzhe Chen, Hong Liang, Weiyu Xu

引用次数: 0

Landing gear condition monitoring based on back propagation neural network-based on multi-strategy cooperative optimization 基于反向传播神经网络的多策略协同优化起落架状态监测

西北工业大学学报 Pub Date : 2023-04-01 DOI: 10.1051/jnwpu/20234120264

Yunwen Feng, Rui Wang, Tao Lu, Jun-Yu Chen, Cheng Lu

{"title":"Landing gear condition monitoring based on back propagation neural network-based on multi-strategy cooperative optimization","authors":"Yunwen Feng, Rui Wang, Tao Lu, Jun-Yu Chen, Cheng Lu","doi":"10.1051/jnwpu/20234120264","DOIUrl":"https://doi.org/10.1051/jnwpu/20234120264","url":null,"abstract":"To effectively monitor the operation state of landing gear, a back propagation neural network-based on multi-strategy cooperative optimization(MSCO-BPNN) is proposed. The multi-strategy optimization algorithm is composed of chaotic mapping strategy, adaptive spiral capture strategy, crossover mutation strategy and whale optimization algorithm(WOA). WOA is applied to find the optimal hyperparameters of back propagation neural network(BPNN). The search efficiency, multi-local search ability and global search performance of model can be improved by using chaotic mapping strategy, adaptive spiral capture strategy and crossover mutation strategy. The BPNN with optimal hyperparameters is introduced to establish the implicit model of input parameters and output responses. Based on quick access recorder(QAR) data, landing gear left side brake temperature is act as the monitoring objective of this paper. The validity and applicability of MSCO-BPNN are verified by compared with WOA-BPNN, particle swarm optimization BPNN and traditional BPNN. The results show that MSCO-BPNN can monitor the operation status of landing gear with high efficiency and accuracy. The efforts of this paper provide a promising insight for the precise condition monitoring of complex structures.","PeriodicalId":39691,"journal":{"name":"西北工业大学学报","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43826665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A combined aerodynamic parameter identification method for missing test data 试验数据缺失的气动参数组合识别方法

西北工业大学学报 Pub Date : 2023-04-01 DOI: 10.1051/jnwpu/20234120282

Yang Liu, Chunna Li, Yuan Fang, Chun-lin Gong

{"title":"A combined aerodynamic parameter identification method for missing test data","authors":"Yang Liu, Chunna Li, Yuan Fang, Chun-lin Gong","doi":"10.1051/jnwpu/20234120282","DOIUrl":"https://doi.org/10.1051/jnwpu/20234120282","url":null,"abstract":"In order to solve the problem that some test data cannot be measured or the measurement is difficult, a combined aerodynamic parameters identification method for missing test data is proposed. In this method, the aerodynamic parameter identification problem is modified into an optimization problem. The initial value of the flight state and the aerodynamic parameter interpolation table are used as design variables, and the motion equation of the aircraft including all aerodynamic parameters is used as a model to construct an objective function containing multiple pieces of test data information. In the optimization, the aerodynamic parameter database and the identification results of the existing methods are used as the prior knowledge. The initial value of the unmeasured data is fitted as the reference value. Then, the feasible sample selection method is designed. Finally, the differential evolution algorithm is used to solve the problem. The proposed method is used to process 264 pieces of test data, and the results show that compared with the existing aerodynamic parameter identification methods, the proposed identification method can obtain all aerodynamic parameters with higher accuracy and can inversely calculate and obtain unmeasured flight test data practical engineering significance.","PeriodicalId":39691,"journal":{"name":"西北工业大学学报","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47479812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Path tracking control of solar-powered UAV based on energy management strategy 基于能量管理策略的太阳能无人机路径跟踪控制

西北工业大学学报 Pub Date : 2023-04-01 DOI: 10.1051/jnwpu/20234120409

Lin Guo, Fei Liu, Jiayu Li, Pei He, Qingdong Li, Jiwei Wang, Yangming Guo

{"title":"Path tracking control of solar-powered UAV based on energy management strategy","authors":"Lin Guo, Fei Liu, Jiayu Li, Pei He, Qingdong Li, Jiwei Wang, Yangming Guo","doi":"10.1051/jnwpu/20234120409","DOIUrl":"https://doi.org/10.1051/jnwpu/20234120409","url":null,"abstract":"To coordinate the conflict between the high-altitude task and long-term energy efficiency of high-altitude long endurance solar UAV, it is one of the core issues of UAV control. A strategy combining the energy management with the route tracking is presented. Firstly, based on the three-dimensional particle motion model, energy storage battery model and solar energy acquisition model for the solar UAV, according to the aerodynamic parameters of the solar UAV and the typical horizontal flight, climb, descent and other motion processes of the solar UAV, the energy management strategy of the solar UAV is designed, and the allocation mechanism and optimal flight parameters of the energy acquisition, storage and consumption of the solar UAV in different flight stages are determined. The surplus solar energy is stored by using the gravitational potential energy, and then the energy management based on height adjustment is carried out to realize the longitudinal tracking control of the solar UAV under different lighting and energy conditions. Then based on the task requirements of the lateral movement of the solar UAV, a track tracking control method based on the feedback linearization method is established by decoupling the particle dynamics equation of the solar UAV, and the track tracking control of the solar UAV in the lateral direction is realized. Finally, a simulation throughout 24 hours is implemented and illustrated the effectiveness of the energy management strategy and route tracking control law.","PeriodicalId":39691,"journal":{"name":"西北工业大学学报","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41513232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on learning algorithm of transfer reinforcement for multi-agent formation control 多智能体群体控制传递强化学习算法研究

西北工业大学学报 Pub Date : 2023-04-01 DOI: 10.1051/jnwpu/20234120389

Penglin Hu, Q. Pan, Yaning Guo, Chunhui Zhao

{"title":"Study on learning algorithm of transfer reinforcement for multi-agent formation control","authors":"Penglin Hu, Q. Pan, Yaning Guo, Chunhui Zhao","doi":"10.1051/jnwpu/20234120389","DOIUrl":"https://doi.org/10.1051/jnwpu/20234120389","url":null,"abstract":"Considering the obstacle avoidance and collision avoidance for multi-agent cooperative formation in multi-obstacle environment, a formation control algorithm based on transfer learning and reinforcement learning is proposed. Firstly, in the source task learning stage, the large storage space required by Q-table solution is avoided by using the value function approximation method, which effectively reduces the storage space requirement and improves the solving speed of the algorithm. Secondly, in the learning phase of the target task, Gaussian clustering algorithm was used to classify the source tasks. According to the distance between the clustering center and the target task, the optimal source task class was selected for target task learning, which effectively avoided the negative transfer phenomenon, and improved the generalization ability and convergence speed of reinforcement learning algorithm. Finally, the simulation results show that this method can effectively form and maintain formation configuration of multi-agent system in complex environment with obstacles, and realize obstacle avoidance and collision avoidance at the same time.","PeriodicalId":39691,"journal":{"name":"西北工业大学学报","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47336947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel bearing fault diagnosis method based on multi-scale transfer symbolic dynamic entropy and support vector machine 基于多尺度传递符号动态熵和支持向量机的轴承故障诊断方法

西北工业大学学报 Pub Date : 2023-04-01 DOI: 10.1051/jnwpu/20234120344

Guangwei YU, Li YAN

引用次数: 0

Characteristic analysis and filtering algorithm design for UNGM model UNGM模型的特征分析与滤波算法设计

西北工业大学学报 Pub Date : 2023-04-01 DOI: 10.1051/jnwpu/20234120293

Shan Lu, Shiyuan Zhang

{"title":"Characteristic analysis and filtering algorithm design for UNGM model","authors":"Shan Lu, Shiyuan Zhang","doi":"10.1051/jnwpu/20234120293","DOIUrl":"https://doi.org/10.1051/jnwpu/20234120293","url":null,"abstract":"The univariate non-stationary growth model (UNGM) is widely used in the verification of nonlinear filters, and the unscented Kalman filter (UKF) is often used as the reference filter for comparative analysis when using this model to evaluate the filter performance. However, due to the strong nonlinearity of UNGM and the change of model properties with different parameter settings, the estimation misalignment problem due to different reasons will occur when UKF is used for filtering. To solve these problems, this paper analyzes the complex characteristics of UNGM in filtering process, and proposes an UKF with sliding sampling module(SSUKF). The algorithm is optimized on the basis of UKF, and can effectively deal with the complex characteristics of UNGM by sampling and analyzing the filtering information in the filtering process and correcting the distribution of Sigma points in real time. SSUKF is applied to UNGM under different parameters and compared with UKF and bootstrap particle filter(BPF). The simulation results show that SSUKF can effectively solve the misalignment problem when UKF is applied to UNGM, and the calculation speed is better than BPF. Compared with UKF, SSUKF is suitable as a benchmark filter for evaluating the performance of nonlinear filters using UNGM.","PeriodicalId":39691,"journal":{"name":"西北工业大学学报","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42449945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on configuration and performance of water ramjet pressurized water intake system 水冲压发动机增压进水系统结构与性能研究

西北工业大学学报 Pub Date : 2023-04-01 DOI: 10.1051/jnwpu/20234120310

Haojie Yang, Kai Luo, Chuang Huang, Zhao Liu, Xu He, Qian Wang

{"title":"Research on configuration and performance of water ramjet pressurized water intake system","authors":"Haojie Yang, Kai Luo, Chuang Huang, Zhao Liu, Xu He, Qian Wang","doi":"10.1051/jnwpu/20234120310","DOIUrl":"https://doi.org/10.1051/jnwpu/20234120310","url":null,"abstract":"Water ramjet is the most ideal power propulsion device for high-speed underwater weapons. However, failure to start it at low-speed makes it hard for the engine to be widely used. In order to solve the problem of starting water ramjet at low-speed, a configuration scheme of water ramjet pressurized water intake system of the micro-turbine driving micro-mixed-flow pump is proposed. The design method of micro-turbine and micro-mixed-flow pump is perfected. And the simulation model of turbine and mixed-flow pump is established. The rationality of the design results was verified by numerical simulation. The matching design of the turbine and the mixed-flow pump is completed. And the working performance of the pressurized water inlet system is analyzed. The results show that the maximum relative deviation between the design results of the turbine and the pump and the target value is less than 3.2%, and the booster system can increase the fluid pressure by 2.0 MPa, reducing the starting speed of the ramjet from 90 to 63 m/s. The research results of this paper have reference value for the engineering application of water ramjet technology.","PeriodicalId":39691,"journal":{"name":"西北工业大学学报","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45720553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0