Journal of Physics-Photonics最新文献_第7页

Reentry trajectory design of a hypersonic vehicle based on reinforcement learning 基于强化学习的高超声速飞行器再入弹道设计

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2633/1/012005

Partha P Das, Wang Pei, Chenxi Niu

{"title":"Reentry trajectory design of a hypersonic vehicle based on reinforcement learning","authors":"Partha P Das, Wang Pei, Chenxi Niu","doi":"10.1088/1742-6596/2633/1/012005","DOIUrl":"https://doi.org/10.1088/1742-6596/2633/1/012005","url":null,"abstract":"Abstract In this research, we investigate control of a hypersonic vehicle (HV) following its reentry into the Earth’s atmosphere, using deep reinforcement learning (DRL) in a continuous space. Here, we incorporate the basic kinematic and force equations of motion for a vehicle in an atmospheric flight to formulate the reentry trajectory satisfying the boundary constraints and multiple mission related process constraints. The aerodynamic model of the vehicle emulates the properties of a common aero vehicle (CAV-H), while the atmospheric model of the Earth represents a standard model based on US Standard Atmosphere 1976, with significant simplification to the planetary model. In an unpowered flight, we then control the vehicle’s trajectory by perturbing its angle of attack and bank angle to achieve the desired objective, where the control problem is based on different actor-critic frameworks that utilize neural networks (NNs) as function approximators to select and evaluate the control actions in continuous state and action spaces. First, we train the model following each of the methods, that include on-policy proximal policy approximation (PPO) and off-policy twin delayed deterministic policy gradient (TD3). From the trajectory generated, we select a nominal trajectory for each algorithm that satisfies our mission requirements based on the reward model.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":"31 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135764044","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

Numerical simulation of ply angle deviation and thermal deformation behavior of CFRP reflector CFRP反射面铺层角偏差及热变形特性的数值模拟

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2633/1/012012

Wenjian Jiang, Hengkun Jiang, Tonglong Huo, Yun Liang

{"title":"Numerical simulation of ply angle deviation and thermal deformation behavior of CFRP reflector","authors":"Wenjian Jiang, Hengkun Jiang, Tonglong Huo, Yun Liang","doi":"10.1088/1742-6596/2633/1/012012","DOIUrl":"https://doi.org/10.1088/1742-6596/2633/1/012012","url":null,"abstract":"Abstract As we know, the ply angle deviation of Carbon Fiber Reinforced Polymer(CFRP) reflector is difficult to obtain accurately in engineering applications, it will make thermal deformation of reflector unpredictable due to the discreteness of ply angle. In this paper, based on constitutive relationships between generalized internal force and strain of laminated composite, a novel ply angle deviation model based on normal distribution is proposed. Furthermore, an orthogonal test was designed and significance analysis were carried out by means of a 2.6m aperture reflector with polygonal back structure. Assumed that the ply angle deviation obeys normal distribution, a number of samples were further randomly generated, and the sample mean and standard deviation of the thermal deformation of reflector were calculated. According to χ2-test of goodness of fit, the thermal deformation of reflector still follows normal distribution. Finally, an example was employed to verify the validity and effectiveness of the proposed method. The results reach a good agreement with the experimental data, thus it is capable of providing a promising prospect for engineering practice.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":"32 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135764205","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

Dynamic and Relaxation of PEG polymer Chain Segment for Phase Change Materials (PCMs) 相变材料(PCMs)中聚乙二醇聚合物链段的动态与弛豫

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2623/1/012020

N A Fauziyah, None Sakinah, W Rachma, S Paratapa, D S Perwitasaric, P C Wardhani, E N Hidayah

{"title":"Dynamic and Relaxation of PEG polymer Chain Segment for Phase Change Materials (PCMs)","authors":"N A Fauziyah, None Sakinah, W Rachma, S Paratapa, D S Perwitasaric, P C Wardhani, E N Hidayah","doi":"10.1088/1742-6596/2623/1/012020","DOIUrl":"https://doi.org/10.1088/1742-6596/2623/1/012020","url":null,"abstract":"Abstract This work’s most notable memory concept for next-generation novels was a reversible phase shift in a substance called phase change materials (PCMs). Here, a polyethylene glycol (PEG) polymer relaxation study employing DMA will be conducted to investigate the qualities of PCMs as superior materials. Through the method of wet mixing, PEG polymer with reinforcement made of silica was synthesized. The variation of silica xerogel was a composition of up to 20% silica xerogel. Adding silica is quite good in reducing the loss factor up to 50 MPa at the addition of 20% silica xerogel. This condition was due to the bonds formed in the polymer chain causing shrinkage and flexibility of composites. Due to the addition of silica xerogel as filler, we can study the relaxation behavior and loss factor of a material using DMA and learn more about its viscoelastic characteristics, including its capacity to absorb vibrations, resistance to impacts, and overall mechanical performance at various temperatures. Relaxation was frequently used to describe phase change materials (PCMs), especially when discussing their capacity to store thermal energy. The release or absorption of thermal energy by a PCM during its phase transition was referred to as the relaxation process.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":"32 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135764206","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 Multi-timescale Scheduling Strategy for Residential Integrated Energy System 住宅综合能源系统的多时间尺度调度策略

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012010

Yang Gao, Siyue Lu, Longfei Ma, Jiani Zeng, Yutong Zhao, Baoqun Zhang, Hui Xu, Xiangyan Yang, Shaobin Yang

{"title":"A Multi-timescale Scheduling Strategy for Residential Integrated Energy System","authors":"Yang Gao, Siyue Lu, Longfei Ma, Jiani Zeng, Yutong Zhao, Baoqun Zhang, Hui Xu, Xiangyan Yang, Shaobin Yang","doi":"10.1088/1742-6596/2636/1/012010","DOIUrl":"https://doi.org/10.1088/1742-6596/2636/1/012010","url":null,"abstract":"Abstract In recent years, multi-energy complementation has been deepening, and the application rate of new energy sources has been increasing. A multi-timescale optimal scheduling strategy is proposed to mobilize the energy flexibility of residential integrated energy systems (RIES) and to reduce the negative impact of source-load forecast uncertainty on the scheduling plan. Firstly, for the energy supply structure of RIES, the operation constraint model of each energy hub equipment is established. Then, the optimal scheduling is divided into three stages: day-ahead planning, intra-day planning, and real-time planning, each of which will consider the volatility of source-load prediction and determine the operation status of the equipment according to its importance level. The experimental results show that the proposed multi-timescale scheduling strategy can ensure the economy while minimizing the deviation of the main grid power purchase in the real-time and day-ahead phases, providing a basis for the development of new energy capacity in the grid to grow to higher penetration rates.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135765003","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 power constant logic circuit based on mask control 基于掩模控制的功率恒逻辑电路

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2645/1/012010

Haiwei Li, Maoqun Yao, Conghui Li, Shanhu Shen

引用次数: 0

Fisheries Water Quality Monitoring Improvement System 渔业水质监察改善系统

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2632/1/012016

Junle Jia, Chun Luo, Zhengyi Hou, Qiqi Xia, Xuanhang Ma, Xiang Pan, Awen Ma, Yuru Zheng

引用次数: 0

Peer Review Statement 同行评议声明

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2645/1/011002

引用次数: 0

Multi-pedestrian Tracking Method Fusing Two-stage Matching 融合两阶段匹配的多行人跟踪方法

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2632/1/012025

Xin Deng, Lijun Zhao, Ruifeng Li

{"title":"Multi-pedestrian Tracking Method Fusing Two-stage Matching","authors":"Xin Deng, Lijun Zhao, Ruifeng Li","doi":"10.1088/1742-6596/2632/1/012025","DOIUrl":"https://doi.org/10.1088/1742-6596/2632/1/012025","url":null,"abstract":"Abstract Multi-pedestrian tracking is one of the hot topics in computer vision. For an intelligent mobile robot, multi-pedestrian tracking from a first-person perspective can provide information for navigating through a crowd and ensure safety. Most of the existing methods cannot deal with occlusion and trajectory overlap well. In this paper, a multi-pedestrian tracking method fusing two-stage matching is proposed. Firstly, the detection and the corresponding feature values of the pedestrians are obtained by a multi-task learning network based on CenterNet. Then the detected pedestrians are matched with feature values by greedy strategy. When dealing with the reappearance of pedestrians caused by occlusion or trajectory overlap, the sample database is established to update the samples in real time. The color histogram and HOG feature are calculated for each sample. When the pedestrian disappears, the direction of disappearance and the last position is recorded for the selection of trajectory. Finally, the KM algorithm is used for cross-frame matching. Our method is compared with some recent methods on MOT data sets. The result shows that our method has a significant improvement in the main evaluation index MOTA.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":"81 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135716633","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

An airborne object detection and location system based on deep inference 一种基于深度推理的机载目标检测定位系统

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2632/1/012019

Xiao Hu, Shenfu Pan, Dongdong Li, Long Feng, Yuan Zhao

引用次数: 0

Reaction Controllable preparation and electrocatalytic performance of two-dimensional sulfides 二维硫化物的反应可控制备及其电催化性能

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2645/1/012017

None XinWang, Qi Chao Yang, Hai tao Wang, Yu Zheng, Geng hang Zhong, Jiang wei Zhao

引用次数: 0