西北工业大学学报最新文献_第2页

Study on bias residual control of high mixture ratio bi-propellant 高混合比双推进剂偏倚残留控制研究

西北工业大学学报 Pub Date : 2023-06-01 DOI: 10.1051/jnwpu/20234130626

Bing Liu, L. Lou, Dong Li, Hui Huang, Honggang Gao

引用次数: 0

A time-frequency feature prediction network for time-varying radio frequency interference 时变射频干扰时频特征预测网络

西北工业大学学报 Pub Date : 2023-06-01 DOI: 10.1051/jnwpu/20234130587

Pengcheng Wan, W. Feng, N. Tong, Wei Wei

引用次数: 0

Waveguide invariant estimation based on correlation coefficient of tonal acoustic intensity interference fluctuation 基于调性声强干扰波动相关系数的波导不变估计

西北工业大学学报 Pub Date : 2023-06-01 DOI: 10.1051/jnwpu/20234130612

Yuan Yao, Chao Sun, Xionghou Liu, Mingyang Li

引用次数: 0

AFDX network equipment fault diagnosis technology AFDX网络设备故障诊断技术

西北工业大学学报 Pub Date : 2023-06-01 DOI: 10.1051/jnwpu/20234130546

Lei Hu, Yang Liu, Q. Guo, Yu Shi, Chunyan Ma, Jian-dong Zhang, Tao Zhang

引用次数: 0

Cracking mechanism analysis and experimental verification of encapsulated module under high low temperature cycle considering residual stress 考虑残余应力的封装模块高低温循环开裂机理分析及实验验证

西北工业大学学报 Pub Date : 2023-06-01 DOI: 10.1051/jnwpu/20234130447

Yongzhi Li, Erming He, Pengxiang Chen, Menghan Yin

{"title":"Cracking mechanism analysis and experimental verification of encapsulated module under high low temperature cycle considering residual stress","authors":"Yongzhi Li, Erming He, Pengxiang Chen, Menghan Yin","doi":"10.1051/jnwpu/20234130447","DOIUrl":"https://doi.org/10.1051/jnwpu/20234130447","url":null,"abstract":"Aiming at the cracking failure of the modified epoxy resin encapsulated module as a result of interface failure under high low temperature cycles, numerical simulation and experimental studies were carried out. Firstly, the residual stress field in the encapsulated module was reconstructed after measuring the curing residual stresses in epoxy resin using the hole-drilling method. Temperature-dependent material models were developed after testing the mechanical and thermal characteristic parameters of encapsulated module components, such as modified epoxy resin, in high and low temperature conditions. Then, a finite element model of a high-reduction encapsulated module with multiple components, multiple interfaces, and complicated contacts was established considering residual stress and temperature effects. To simulate the failure behaviour of the resin-embedded part interfaces, the cohesive zone model was utilized. Finally, the stress and strain of the encapsulated module under high and low temperature cycles were simulated, and their distribution features and cracking failure mechanism were analyzed. The results indicate that regardless of the heating/cooling process, significant due to a mismatch in thermal expansion coefficients between the resin and the embedded parts. As the temperature approaches the glass transition temperature Tg, the difference grows dramatically. The resulting thermal stress, together with the residual stress, led to the interface failure in encapsulated module. The numerical results were in good agreement with the high and low temperature cycle test results of the encapsulated module, which verified the effectiveness of the analysis method and the established finite element model. The investigation provides an important reference for the high-reliability design of the encapsulation module.","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":"42513296","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 obstacle avoidance motion planning method of manipulator in complex multi scene 复杂多场景下机械手避障运动规划方法研究

西北工业大学学报 Pub Date : 2023-06-01 DOI: 10.1051/jnwpu/20234130500

Yong Song, Lei Zhang, Rongtang Tian, Xiaohua Wang

{"title":"Research on obstacle avoidance motion planning method of manipulator in complex multi scene","authors":"Yong Song, Lei Zhang, Rongtang Tian, Xiaohua Wang","doi":"10.1051/jnwpu/20234130500","DOIUrl":"https://doi.org/10.1051/jnwpu/20234130500","url":null,"abstract":"In order to improve the efficiency and success rate of obstacle avoidance motion planning of industrial manipulator in complex multi scenes, a collision detection model between manipulator and obstacles based on cylinder and sphere bounding box is established, and an improved RRT* algorithm based on heuristic probability fusion artificial potential field method(P-artificial potential field RRT*, PAPF-RRT*) is proposed. The probability target bias and random sampling point optimization strategy are introduced into the sampling, and the location optimization constraints are applied to the sampling points to enhance the sampling guidance and quality. In order to change the expansion direction of the traditional new node and the local optimization problem in special environment, the target gravity, obstacle repulsion and adaptive step size of the artificial potential field method are combined, so that the algorithm can guide the expansion direction and step size of the new node in real time within the resultant force range generated by APF, reducing excessive exploration and the expansion of the collision region. The Cubic B-spline is used to interpolate and optimize the planned path to reduce the complexity of the path and improve the flexibility of the path. The simulation results in two-dimensional and three-dimensional multi scenes show that the present algorithm reduces the average path search time by 31.22% and shortens the path length by 17.32% comparing with the traditional RRT* algorithm. The visual simulation results show that the present algorithm can make the manipulator successfully avoid obstacles and run to the target point quickly and smoothly.","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":"47473961","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

Target recognition algorithm based on HRRP time-spectrogram feature and multi-scale asymmetric convolutional neural network 基于HRRP时谱特征和多尺度非对称卷积神经网络的目标识别算法

西北工业大学学报 Pub Date : 2023-06-01 DOI: 10.1051/jnwpu/20234130537

Tao Yun, Q. Pan, Yuhang Hao, Rong Xu

引用次数: 0

Effect of bolt tightening torque on fatigue life of multi-bolted composite structure 螺栓拧紧力矩对多螺栓复合结构疲劳寿命的影响

西北工业大学学报 Pub Date : 2023-06-01 DOI: 10.1051/jnwpu/20234130455

Jiachen Dong, Zhiyong Yang, Xitao Zheng, Mingyu Song, Leilei Yan

{"title":"Effect of bolt tightening torque on fatigue life of multi-bolted composite structure","authors":"Jiachen Dong, Zhiyong Yang, Xitao Zheng, Mingyu Song, Leilei Yan","doi":"10.1051/jnwpu/20234130455","DOIUrl":"https://doi.org/10.1051/jnwpu/20234130455","url":null,"abstract":"Bolt tightening torque has an influence on the fatigue life of the multi-bolted joints which cannot be ignored, but there are few methods to predict the fatigue life of the multi-bolted composite structure by considering the bolt tightening torque. A fatigue life prediction method of the multi-bolted composite structure by considering the bolt tightening torque is proposed. It can take into account the various damages of bolts and laminates and accurately calculate fatigue life and damage evolution of multi-bolted composite structure. The multi-bolted composite structure being composed of T300/BMP-316 composite laminates and TC4 titanium alloy bolts is used to verify the present method. The logarithmic error between the predicted fatigue life and the experimental is 4.36%, and the failure mode is consistent with the experimental. Through the present method, the influence of the bolt tightening torque is explored, in which it is found that with the increasing of bolt tightening torque, the fatigue life increases firstly and decreases, and there is an optimal tightening torque. By observing the damage evolution diagram, it is found that when the tightening torque is below the optimal tightening torque, the damage propagation cannot be effectively restrained, which will lead to the reduction of fatigue life. On the contrary, when the tightening torque is more than the optimal tightening torque, it will cause the initial damage to the test piece, which will also lead to the reduction of fatigue life. In engineering, to choose the best tightening torque of the structure for assembly can effectively improve the fatigue life of the structure.","PeriodicalId":39691,"journal":{"name":"西北工业大学学报","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57899156","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

MUSIC algorithm based on eigenvalue clustering 基于特征值聚类的MUSIC算法

西北工业大学学报 Pub Date : 2023-06-01 DOI: 10.1051/jnwpu/20234130574

Mingyang Zhang, Songyuan Zha, Yudong Liu

引用次数: 0

A kinematic modeling scheme of three-axis "Satcom-on-the-Move" antenna based on modified Denavit-Hartenberg method 基于改进Denavit-Hartenberg法的三轴“移动卫星”天线运动学建模方案

西北工业大学学报 Pub Date : 2023-06-01 DOI: 10.1051/jnwpu/20234130518

Jiao Ren, Xiaoxiang Ji, Jianghong Li, Leijin Han, Yafeng Wu

引用次数: 1