Loss Prediction of Vehicle Permanent Magnet Synchronous Motor Based on Deep Learning

He Liange,Wu Xinyang,Nie Yuanhang,Shi Wenjun 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2

Based on the deep learning BP neural network algorithm, we establish the electromagnetic torque and loss prediction analysis model of permanent magnet synchronous motor to provide new design ideas and methods for optimizing motor structure design. In this paper, four-rotor structure parameters which are Rib, Air Gap, Magnet Thickness and Magnet Width, motor electromagnetic torque, and motor losses of the “V” type Interior Permanent Magnet Synchronous Motor are selected as the research object. The BP neural network structure prediction model with 2 visible layers and 2 hidden layers was built by 256 groups of sample data calculated by Maxwell transient electromagnetic simulation. 226 out of 256 randomly selected data samples were used to train the prediction model, and 30 groups were used to test the accuracy and generalization ability of the prediction model. and the prediction results data were compared with the deep learning prediction model through finite element simulation data. The results show that the BP neural network small-sample data prediction model has high prediction accuracy in the loss prediction of the vehicle permanent magnet synchronous motor, and verifies the feasibility of the motor torque and loss prediction model based on the deep learning algorithm.

Research on Temperature Rise Characteristics of Vehicle Motors Under Bench Working Condition

He Liange,Shi Wenjun,Xia Xiaohua,Wu Xinyang,Chen Hongling,Yan Xin 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.6

The specifi c bench test specifi ed by the product design standard is an important basis for judging whether the vehicle motor meets the requirements. To study the temperature rise characteristics of automotive permanent magnet synchronous motors under bench test conditions. Firstly, the bench condition was taken as the target we need to study, and the fi nite element method was used to calculate the loss of each part during the bench test condition. Secondly, use this loss as the heat source for temperature fi eld calculation to simulate the temperature fi eld of the motor under bench test conditions. Finally, a bench test platform was built for testing, and the test results and simulation results were compared and analyzed. Studies have shown that in the entire process of changing conditions, the temperature of each component is not the same as the sensitivity to changes in operating conditions. The maximum relative error between simulation and experiment was 9.4%, which verifi es the eff ectiveness of this research method and process, which has certain guiding signifi cance for the design and optimization of vehicle motors.

Boiling heat transfer-based temperature rise characteristics of automotive permanent magnet synchronous motors at peak operating conditions

He Liange,Chen Hongling,Shi Wenjun 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.7

Using two-phase flow boiling heat transfer theory, the RPI subcooling boiling heat transfer model was established to study the temperature rise characteristics of the permanent magnet synchronous motor (PMSM) of electric vehicles under peak operating conditions, and the effects of coolant inlet temperature, altitude and inlet flow rate on the motor temperature rise were analyzed. The results showed that: the temperature rise characteristics of the motor are closer to the test results when boiling heat transfer is considered after the motor is warmed up, so the effect of boiling heat transfer of the cooling system should be considered when studying the temperature rise characteristics of the motor; The temperature rise characteristic of the motor increases with the increase of coolant inlet temperature at peak working condition. The short time required for the motor winding to reach 150 °C indicates that the motor temperature rises quickly. In the plateau environment, the temperature growth rate of the motor at peak working conditions increases with the increase of cooling water inlet temperature, while the motor temperature decreases with the decrease of atmospheric pressure. Thus, due to the boiling heat transfer phenomenon of cooling water two-phase flow, the temperature rise characteristic of the motor at high altitude is better than that in plain area.

Mechanical behavior of stud shear connectors embedded in HFRC

Yu-Liang He,Xu-Dong Wu,Yiqiang Xiang,Yu-Hang Wang,Li-Si Liu,Zhi-Hai He 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.24 No.2

Hybrid-fiber reinforced concrete (HFRC) may provide much higher tensile and flexural strengths, tensile ductility, and flexural toughness than normal concrete (NC). HFRC slab has outstanding advantages for use as a composite bridge potential deck slab owing to higher tensile strength, ductility and crack resistance. However, there is little information on shear connector associated with HFRC slabs. To investigate the mechanical behavior of the stud shear connectors embedded in HFRC slab, 14 push-out tests (five batches) in HFRC and NC were conducted. It was found that the stud shear connector embedded in HFRC had a better ductility, higher stiffness and a slightly larger shear bearing capacity than those in NC. The experimentally obtained ultimate resistances of the stud shear connectors were also compared against the equations provided by GB50017 2003, ACI 318-112011, AISC 2011, AASHTO LRFD 2010, PCI 2004, and EN 1994-1-1 (2004), and an empirical equation to predict the ultimate shear connector resistance considering the effect of the HFRC slabs was proposed and validated by the experimental data. Curve fitting was performed to find fitting parameters for all tested specimens and idealized load-slip models were obtained for the specimens with HFRC slabs.

Numerical analysis of large stud shear connector embedded in HFRC

Yu Liang He,Chong Zhang,Li Chao Wang,Ying Yang,Yi Qiang Xiang 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.80 No.5

To investigate the mechanical behavior of large stud shear connector embedded in hybrid fiber-reinforced concrete (HFRC), a refined 3D nonlinear finite element (FE) model incorporating the constitutive model of HFRC was developed using ANSYS. Firstly, the test results conducted by the authors (He et al. 2017) were used to validate FE model of push out tests. Secondly, a total of 27 specimens were analyzed with various parameters including fiber volume fractions of HFRC, diameter of studs and HFRC strength. Finally, an empirical equation considering the contribution of steel fiber (SF) and polypropylene fiber (PF) was recommended to estimate the ultimate capacity of large stud shear connector embedded in HFRC.

Roles of Immunohistochemical Staining in Diagnosing Pulmonary Squamous Cell Carcinoma

Yan, Yue,Zhang, Ya-Xiong,Fang, Wen-Feng,Kang, Shi-Yang,Zhan, Jian-Hua,Chen, Nan,Hong, Shao-Dong,Liang, Wen-Hua,Tang, Yan-Na,He, Da-Cheng,Wu, Xuan,Zhang, Li Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.2

Background: Differentiating morphologic features based on hematoxylin-eosin (HE) staining is the most common method to classify pathological subtypes of non-small-cell lung cancer (NSCLC). However, its accuracy and inter-observer reproducibility in pathological diagnosis of poorly differentiated NSCLC remained to be improved. Materials and Methods: We attempted to explore the role of immunohistochemistry (IHC) staining in diagnosing pulmonary squamous cell carcinoma (SQCC) with poorly differentiated features by HE staining or with elevated serum adenocarcinoma-specific tumor markers (AD-TMs). We also compared the difference of epidermal growth factor receptor (EGFR) mutation rate between patients with confirmed SQCC and those with revised pathological subtype. Logistic regression analyses were used to test the association between different factors and diagnostic accuracy. Results: A total of 132 patients who met the eligible criteria and had adequate specimens for IHC confirmation were included. Pathological revised cases in poor differentiated subgroup, biopsy samples and high-level AD-TMs cases were more than those with high/moderate differentiation, surgical specimens and normal-level AD-TMs. Moreover, biopsy sample was a significant factor decreasing diagnostic accuracy of pathological subtype (OR, 4.037; 95% CI 1.446-11.267, p=0.008). Additionally, EGFR mutation rate was higher in patients with pathological diagnostic changes than those with confirmed SQCC (16.7% vs 4.4%, p=0.157). Conclusions: Diagnosis based on HE staining only might cause pathological misinterpretation in NSCLC patients with poor differentiation or high-level AD-TMs, especially those with biopsy samples. HE staining and IHC should be combined as pathological diagnostic standard. The occurrence of EGFR mutations in pulmonary SQCC might be overestimated.

New Construction of Efficient Certificateless Aggregate Signatures

He Liu,Sijia Wang,Mangui Liang,Yongqian Chen 보안공학연구지원센터 2014 International Journal of Security and Its Applicat Vol.8 No.1

Research on the Sustainable Development of Chinese Regional Food Culture Integrating Service Design Thinking

He, Song Fei(하송비),Liang, Yue Hui(양월휘),Chung, Mi Sun(정미선) 한국전시산업융합연구원 2021 한국과학예술융합학회 Vol.39 No.2

This study begins with the phenomenon that cultural conflict may occur between people with different social backgrounds, lifestyles and values in the context of social and economic globalization. Cultural conflict is one of the preconditions to promote cultural identity, and cultural identity is also the basis for the sustainable development of regional culture. With the rapid development of society and the substantial improvement of material conditions, food and clothing is no longer a social problem in China. People begin to pay attention to their own internal needs and have more diversified demands on the connotative value and presentation of food. As a symbol of regional culture, food can reflect the internal culture of the region and the social and cultural relationship between the region and other regions. It is an important carrier of the sustainable development of regional culture. In the face of the increasing demand at all levels, tangible single products can no longer meet the needs of users, thus promoting the market economy from product oriented to service-oriented competition. The purpose of this study is to deconstruct and reconstruct a variety of possibilities between regional food, regional culture and people, give play to the role of service design thinking in this process, and explore the value and significance of service design thinking in the process of sustainable development of regional food culture. Therefore, this paper attempts to use service design thinking to participate in the research process of the sustainable development of Chinese regional culture, and its methods and tools to participate in the process of regional culture characteristic food is not only the food remanufacturing and so on. The key is to study and analyze the relationship between the cultural attributes and lifestyle of regional food, create design value by means of symbols, vision, products, space and service process, and enhance the cultural significance and commercial attributes of food with the intervention of multi stakeholders. The research results and contents are as follows: firstly, as the determination and expression of regional food cultural connotation information, service design is not only the presentation of food material attribute information, but also the fundamental driving force to promote the development of intangible values (information, memory, interaction, etc.) such as its cultural attribute. Secondly, the food system involved in service design pays attention to the experience perception of users, promotes collaborative innovation activities of regional food stakeholders, maximizes the value of regional cultural information obtained by stakeholders in the service system, cooperatively creates possible solutions and improves the service quality of the food system. Thirdly, service design improves the user experience of regional food culture, explores the interactive relationship between people and time, region, culture, food and other contacts, and uses symbols and other means of information expression to play the role of people in promoting and inheriting the sustainable development of culture in the regional food system. Based on the research results, this paper looks forward to the ability and creativity of service design to solve the problem of sustainable development of food culture with regional characteristics, promote the advanced innovation of food culture with regional characteristics, and transmit and develop more diversified cultural values.

Non-leaching and durable antibacterial textiles finished with reactive zwitterionic sulfobetaine

Liang He,Chang Gao,Sha Li,Cordelia T.W. Chung,John H. Xin 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-

An antibacterialfinishing protocol using a reactive sulfobetaine was reported to fabricate safe anddurable antibacterial textiles. The specifically designed sulfobetaine contains highly reactive triazinegroup acting as an anchor tofix the antibacterial betaine group on textiles via covalent bond formation. After thefinishing, the textiles were endowed durable antibacterial activities of 98.0% against gramnegativeEscherichia coli and 95.2% against gram-positive Staphylococcus aureus even after they werelaundered for 30 times. The safety evaluation showed that the reactive sulfobetaine had no skin irritationand cytotoxicity. These results indicate that the developed antibacterialfinishing is safe and durable ontextiles.

The association study between CYP20A1, CYP4F2, CYP2D6 gene polymorphisms and coronary heart disease risk in the Han population in southern China

Liang Tiebiao,Liang Anshan,Zhang Xianbo,Wang Qi,Wu Haiqing,He Jun,Jin Tianbo 한국유전학회 2022 Genes & Genomics Vol.44 No.9

Background: Coronary heart disease (CHD) is a disease that seriously harms human health. Genetic factors seriously affect the CHD susceptibility. The CYP20A1, CYP4F2 and CYP2D6 are important drug metabolism enzymes in the human body. Objective: We aimed to explore the association between CYP20A1, CYP4F2, CYP2D6 single nucleotide polymorphisms (SNPs) and CHD risk in the Chinese Southern Han population. Methods: Based on the 'case-control' experimental design (505 cases and 508 controls), we conducted an association study between 5 candidate SNPs selected from CYP20A1 (rs2043449), CYP4F2 (rs2108622, rs3093106, rs309310), CYP2D6 (rs1065852) and CHD risk. Logistic regression was used to analyze the CHD susceptibility under different genetic models. Multi-factor dimensionality reduction (MDR) was used to analyze the interaction of 'SNP-SNP' in CHD risk. Results: Our results showed that under multiple genetic models, CYP2D6 rs1065852 significantly increased the CHD risk in these participants who are ≤ 60 years old (OR 1.40, CI 1.07-1.82, p = 0.013), smokers (OR 1.40, CI 1.02-1.93, p = 0.039), or have family history (OR 1.24, CI 1.02-1.51, p = 0.035). CYP4F2 SNPs rs2108622 (OR 0.63, CI 0.43-0.93, p = 0.020), rs3093106 (OR 0.52, CI 0.29-0.92, p = 0.023), and rs309310 (OR 0.55, CI 0.31-0.96, p = 0.033) were potentially associated with the course of CHD patients. Conclusion: Our study found that CY2D6 rs1065852 has an outstanding and significant association with increased CHD risk. Our study provided data supplements for CHD genetic susceptibility loci, and also provided a new and valuable reference for CHD drug treatment.