上海工程技术大学学报

2024, 38(2): 1-3. doi: 10.12299/jsues.23-0142FL

Abstract:

[Abstract](181) [FullText HTML] (84) [PDF 201KB](219)

2024, 38(2): 1-4. doi: 10.12299/jsues.23-0133FL

Abstract:

[Abstract](115) [FullText HTML] (49) [PDF 154KB](42)

2024, 38(2): 1-1. doi: 10.12299/jsues.23-0173FL

Abstract:

[Abstract](109) [FullText HTML] (64) [PDF 162KB](37)

Visual measurement method for aircraft milling parts' guide hole with interference area

GAO Guangya, YAN Juan, YANG Huibin, LIU Yabiao

2024, 38(2): 111-117. doi: 10.12299/jsues.23-0173

Abstract:
In the measurement process of aerospace milling parts, traditional image processing methods cannot effectively measure the size of guide holes in milling parts that contain interference factors such as chips and cutting fluid. To address this issue, a visual measurement method for workpiece aperture based on the TransUNet model was proposed to detect interference regions in the workpiece image, and a mixed pooling module was introduced to improve the model's feature recognition range for chips and cutting fluids. Then, an image direction texture repair method was used to repair the detection image, and the guide hole edge pixels were extracted by improving the edge detection algorithm. Combining the random sampling consensus algorithm and least squares method, the guide hole geometric size was obtained by filtering and fitting the edge pixel points. Finally, the effectiveness of the method was verified by an example of aerospace fixture plate. The measurement accuracy of the guide hole aperture is 0.03 mm, which can meets the requirements of quality inspection for aerospace milling parts.

[Abstract](114) [FullText HTML] (59) [PDF 1792KB](47)

Design of acoustic emission detection system for fastener and characteristic analysis of damage signal

SUN Qing

2024, 38(2): 118-122. doi: 10.12299/jsues.23-0158

Abstract:
Fracture disease of fasteners and elastic strips is one of the risk sources of train operation safety. The fastener sling status detection is mainly based on manual inspection, which is difficult to detect in a timely manner, and there is a lack of effective non-destructive testing methods. The acoustic emission technology was applied to the damage detection of fastener sling, and a fastener acoustic emission signal acquisition system was developed; type B sling static load compression experiment system was built; the complete acoustic emission signal during the fracture and damage of the type B strip was acquired. Using the acoustic emission parameter analysis method to analyze the three damage stages of the slug fracture process, the crack extension stage acoustic emission events are more active and the amplitude is higher. The characteristics of the acoustic emission signal at the different damage stages were obtained by acoustic emission waveform analysis method, and the energy of the acoustic emission signal from the crack initiation to the extension to the fracture damage stage increased in the frequency band, and the later stage of damage, the higher frequency component of the acoustic emission signal.

[Abstract](113) [FullText HTML] (57) [PDF 1321KB](39)

Unmanned vehicle trajectory tracking control based on weighted variable time domain MPC

GAO Shaoyuan, WU Changshui

2024, 38(2): 123-131. doi: 10.12299/jsues.23-0164

Abstract:
In order to improve the accuracy and stability of unmanned vehicle trajectory tracking, a vehicle motion control method based on weighted variable time domain model predictive control (MPC) was proposed. The grey relational analysis method was used to determine the optimal time domain under different speed conditions, and the Fourier approximation method was used to fit the time domain parameters. Taking the controller calculation time as the weight coefficient, a weighted variable time domain MPC semi-empirical model with time domain parameters varying with vehicle speeds was obtained. The model can select the relative optimal time domain according to the change of vehicle trajectory tracking speed, and improve the tracking accuracy and stability of the controller under different vehicle speeds. Selecting 50 and 100 km/h as representative vehicle speeds, the control effects of the traditional time-domain MPC controller and the weighted time-domain MPC controller were compared by simulation experiments. The results show that the weighted variable time domain controller can effectively improve the tracking performance of the controller, the maximum lateral deviation is reduced by 1.98%, the maximum yaw angle deviation is reduced by 60%, and the controller solution time is reduced by 7.2%. And it also has strong adaptability to different target speed conditions.

[Abstract](171) [FullText HTML] (84) [PDF 1625KB](44)

Tripartite stakeholder decision optimization of aircraft leasing based on SD evolutionary game

CHEN Huiqian, GAO Jinmin

2024, 38(2): 132-138, 204. doi: 10.12299/jsues.23-0184

Abstract:
Based on the evolutionary game theory and considering the new relationship between the leasing parties as parent-subsidiary companies, a tripartite evolutionary game model of the government, airlines and leasing companies was constructed, the system dynamics (SD) method was used to conduct dynamic simulation of strategies, and sensitivity analysis was conducted on key factors affecting evolutionary strategies. When the government enhances social benefits and actively regulates, the penalty imposed on leasing companies by airlines adopting an 'antagonistic' strategy increases, and so does the additional revenue of leasing companies, thereby accelerating the maturity of the aviation leasing market. The research results can provide the direction for the leasing market to accelerate its maturation under the new relationship, and also a theoretical basis for the government to formulate regulatory policies for aircraft leasing affiliates.

[Abstract](135) [FullText HTML] (72) [PDF 2459KB](30)

Hydrothermal synthesis of MnO₂/SiC activated peroxymonosulfate for degradation of methylene blue

CHEN Yinjie, LI Li, CAI Xinyu, ZHANG Wenjuan, ZHANG Wenqi, LI Guanghui, RAO Pinhua

2024, 38(2): 139-145. doi: 10.12299/jsues.23-0172

Abstract:
The degradation of organic pollutants by transition metal activated peroxymonosulfate (PMS) has important application value in the field of advanced oxidation. MnO₂/SiC composite catalyst was prepared by hydrothermal method on the surface of silicon carbide (SiC), which was used to activate PMS to degrade and remove methylene blue (MB) from water. The results show that MnO₂ is uniformly attached to the surface of SiC in the form of particles, and the removal rate of MB by MnO₂/SiC-PMS system reaches 99% within 40 min. The MnO₂/SiC-PMS system can achieve high degradation efficiency of MB over a wide pH range (5.0~9.0), while 5 mmol/L Cl⁻and NO⁻ ₃ had no significant effect on the MnO₂/SiC-PMS system. Phosphate and bicarbonate have quenching effect on oxidative free radicals, leading to a decrease in the degradation efficiency of MB in the MnO₂/SiC PMS system. The results of free radical quenching experiments indicate that $ {\text{O}}_{\text{2}}^{{-·}} $ plays a major role in the MnO₂/SiC-PMS system. In addition, MnO₂/SiC has good recyclability.

[Abstract](112) [FullText HTML] (62) [PDF 2284KB](33)

Study on properties and failure modes for piercing plug of high alloy steel

XIE Qilin, WANG Jiugang

2024, 38(2): 146-152. doi: 10.12299/jsues.24-0144

Abstract:
Plug is the key tool for cross-piercing, its lifespan has a significant impact on the quality and cost of the hollow bloom. The methods of etallographic microscope, scanning electron microscope, Gleeble thermal simulation, and friction and wear tester were used to study the microstructure, hardness, deformation resistance, and friction and wear performance, and the typical failure modes of piercing plugs of high alloy tube were summarized. Research results show that the micro-structure of the plug is sorbite, the Vickers hardness (HV) is approximate 258, the friction and friction factor is approximate 0.45. Within the range of 900~1250 ℃, as the temperature increases, the deformation resistance of the plug decreases from 290 to 77 MPa. The typical failure modes of plugs used for high alloy tube piercing include nose collapse, wearing a hat, loss of flesh, sticking, and longitudinal cracks. The causes of failure mode are that the plug is subjected to great axial force, compressive stress and shear stress in the environment of quenching and hot rolling.

[Abstract](117) [FullText HTML] (57) [PDF 2653KB](31)

Thermal behavior analysis of wheat straw during pyrolysis

GUAN Yunlong, GUO Yun, CHEN Baoming

2024, 38(2): 153-157. doi: 10.12299/jsues.23-0155

Abstract:
The pyrolysis temperature and pyrolysis rate are important factors affecting the products of wheat straw. To investigate the effects of temperature and rate on the pyrolysis process of wheat straw, a kinetic and thermodynamic model of wheat straw during pyrolysis was established in Fluent simulation software, and its thermal behavior was analyzed to simulate the pyrolysis process of wheat straw under different heating rates and pyrolysis temperatures. The simulation results show that the higher the pyrolysis rate and temperature, lower the yield of solid products such as coke, and the higher the yield gas products.

[Abstract](100) [FullText HTML] (51) [PDF 1064KB](29)

Research progress in additively manufactured of selective laser melting 316 stainless steel

ZHANG Haibo, LIU Yanhui, ZHANG Huiyan, SHEN Zihao, LI Chuanchang

2024, 38(2): 158-164. doi: 10.12299/jsues.23-0238

Abstract:
Selective laser melting (SLM) technology has broad application prospects in the fields of metal additive manufacturing, aerospace vehicles, etc. The research progress of SLM316 stainless steel materials in terms of process, structure, properties, and applications were summarized, and the existing problems and solutions were analyzed and explored. The problems in the production process, product quality, performance stability, and post-treatment process of SLM were analyzed. The microstructure and mechanical properties of 316 stainless steel additive were further studied. influences of the process on the microstructure and properties were analyzed. By reasonably controlling the laser additive manufacturing process, it can provide support for the application of the technology in the industry.

[Abstract](143) [FullText HTML] (85) [PDF 2025KB](31)

Experimental study on heating characteristics of radiant air conditioning system

ZHANG Heng, FU Yunzhun

2024, 38(2): 165-170. doi: 10.12299/jsues.23-0178

Abstract:
To explore the heating characteristics of a radiation air conditioning system, a radiation air conditioning system test bench was built, a 7-day intermittent operation test was conducted. The temperature and humidity of the air from two-stage fresh air unit, the heat output and efficiency of the air-source heat pump, as well as the energy use and efficiency ratio of the system were analyzed emphatically. The results show that under setting parameters, the stable supply air temperature and humidity of the two-stage fresh air are about 27 ℃ and 35%, respectively. The average heating capacity of the air source heat pump host is 4.5 kW, and the heating coefficient of performance (COP_U) is 4.10. The power consumption of the radiation air conditioning system is 1.5 kW·h, and the system coefficient of performance (COP_S) is 3.02. The results can provide reference for further optimization and promotion of the system.

[Abstract](129) [FullText HTML] (77) [PDF 1572KB](25)

Kinematic simulation of underwater crawling of dredging robot based on recurdyn

FENG Yening, LI Tijin, ZHOU Wei, XU Bin, WU Minghui

2024, 38(2): 171-178. doi: 10.12299/jsues.23-0176

Abstract:
Aiming at the problem that industrial silt in settling tank was difficult to clean up, a crawler-type underwater dredging robot which can adapt to complex environment was designed. A crawler-type moving mechanism was used by the silt removal robot to adapt to soft mud layer. The stability of the dredging robot driving on flat ground and up and down slopes were analyzed, and the feasible region of the center of buoyancy of dredging robot running stably was obtained. The dynamic model of a dredging robot was built based on RecurDyn simulation software, and different types of terrain environment and working conditions were analyzed when the robot operating underwater. The results indicate that the buoyancy set in the center of buoyancy domain when the stability of the robot is higher. The height of the center of mass of the dredging robot can always remain stable and meet the design requirements. It is confirmed that the dredging robot can stably pass through 15° slopes and 100 mm obstacle, which proves that the design of the dredging robot can adapt to the complex underwater environment.

[Abstract](161) [FullText HTML] (68) [PDF 2157KB](40)

Research on person re-identification by fusing posture information and attention mechanisms

LIANG Danyang, WEI Dan, ZHUANG Xuyao, JIANG Lei

2024, 38(2): 179-186. doi: 10.12299/jsues.23-0181

Abstract:
To address the problem of pedestrian occlusion and messy background information in the task of pedestrian re-identification (Re-ID), the human body key point model was adopted to locate the key point information of the pedestrians to eliminate the background information, and the image was segmented into semantic information based on the key point information. In order to make the extracted features of backbone network more robust, enhanced attention module (EAM) was designed, which allows the network to automatically assign weights, and the more recognizable feature vectors were finally obtained. These parts and the overall image were fed into a neural network that incorporates the modified attention mechanism and optimized the network by combining multiple losses. Experiments on several pedestrian re-recognition datasets validate that the proposed method outperforms most state-of-the-art methods. In addition, the experimental results also show that the network has a positive effect on the cross-domain and occlusion problems.

[Abstract](157) [FullText HTML] (86) [PDF 1402KB](35)

Attitude control of shockwave robot based on time-of-flight sensor

LI Zeguang, XIONG Genliang, YU Chao, LV Xianji, YIN Peng

2024, 38(2): 187-195. doi: 10.12299/jsues.23-0187

Abstract:
In the service industry involving massage and health preservation, as well as the field of physical therapy for muscle strains, replacing manual labor with robotic arms can not only free up manpower, but also control the posture of physical therapy equipment more systematically and accurately. Shock wave therapy requires contact with the human body surface and operates in a certain posture, such as normal direction, and it is a major difficulty to control the robot posture to work from the normal direction of human body at all the times. The posture control of shock wave robot based on time-of-flight sensors was proposed, ranged sensor array with multiple VL6180X sensors was mounted on the end of the robot arm, and the distance from the robot to the human surface was measured to obtain the human surface position information. Based on this information, a human surface model was constructed in real time using the least squares method to control the robot posture and perform physiotherapy massage on the human body from the normal direction.

[Abstract](149) [FullText HTML] (92) [PDF 2641KB](22)

Statistical analysis and application of zero-and-one-inflated geometric distribution

LIU Mengyao, XIAO Xiang

2024, 38(2): 196-204. doi: 10.12299/jsues.23-0213

Abstract:
Zero-and-one-inflated geometric distribution model was investigated, the conditional distribution of latent variables were constructed, and a sampling algorithm was designed. On the basis of data expansion, the maximum likelihood estimation, expectation maximization (EM) algorithm and Bayesian method were employed to estimate the model parameters. Different sample sizes and parameter true values were setted, and the performance of these methods were evaluated through numerical simulations. Finally, the Detroit traffic accident deaths dataset in 1994 of United States were analyzed, the results indicate that zero-and-one-inflated geometric distribution model can fit the dataset better.

[Abstract](149) [FullText HTML] (88) [PDF 848KB](17)

Edible oil drums date detection based on boundary learning

SHEN Shiyu, YANG Chaoyu

2024, 38(2): 205-211. doi: 10.12299/jsues.23-0161

Abstract:
In the industrial production environments such as irregular shapes of text, high reflectivity and blurring, the existing text detection method have the problems of inaccurate border localization and the limitation of detecting text within rectangular boxes. Based on boundary learning, a unified, broad-to-fine detection framework was proposed. It mainly consists of a feature extraction backbone network, a boundary suggestion module, and an iterative optimized boundary transformer module. ResNet network was used in the feature extraction backbone network to extract features from images. The boundary suggestion module consisted of multi-layer dilation convolution was used to generate rough bounding boxes. Additionally, an encoder-decoder structure was used in boundary transformer module to gradually improve the rough bounding boxes by iterative deformation under the guidance of classification map, distance field and direction field. The results of experiments conducted based on the self-collected datasets show that the accuracy, recall and F-measure values of the model are 91.56%, 87.38% and 89.41% respectively. The efficiency and advantages of the algorithm in the date detection of edible oil drums are verified.

[Abstract](75) [FullText HTML] (87) [PDF 2476KB](13)

Influence of haptic imagery on purchase intention in apparel online purchase

HAN Bo, LI Pei, LIU Xin

2024, 38(2): 212-217. doi: 10.12299/jsues.23-0142

Abstract:
Haptic imagery provides consumers with sensory connection experiences between physical touch and online virtual touch in online shopping. Based on the S-O-R model and in conjunction with the literature, an empirical analysis was conducted to explore the influence of haptic imagery on apparel online purchase intention. The results show that in apparel online shopping, haptic imagery has a significant positive effect on perceived product quality, purchase intention and pleasure; pleasure and time risk significantly and positively affect purchase intention; pleasure has a mediating effect between haptic imagery and purchase intention; need for touch has a significant positive moderating role in the relationship between haptic imagery and perceived product quality, and between haptic imagery and pleasure. The results of the study can provide a basis for apparel companies to improve their online haptic marketing strategies.

[Abstract](113) [FullText HTML] (68) [PDF 652KB](13)

Influence of consumers' positive expectation discrepancy on clothing repurchase intention in online shopping

TAN Xiaoqin, LI Pei

2024, 38(2): 218-222. doi: 10.12299/jsues.23-0133

Abstract:
To explore the relationship between consumer expectation and repurchase intention, four variables that may affect repurchase intention, including price discount, waiting time, brand image and clothing product design were proposed. Clothing quality perception and value perception were considered as intermediary variables, and a theoretical model was constructed. Empirical analysis was conducted by using regression analysis, structural equation model, and Bootstrap test. The results show that price discount, waiting time, brand image and clothing product design have positive influence on repurchase intention. The clothing quality perception and clothing value perception play an intermediary role between consumer expectation difference and repurchase intention. The results provide a theoretical reference for clothing brand to improve positive expectations of consumers.

[Abstract](110) [FullText HTML] (56) [PDF 636KB](12)

Supply chain return freight insurance and pricing strategy considering consumer risk avoidance

SI Fengshan, YU Zhen, WANG Jing

2024, 38(2): 223-230. doi: 10.12299/jsues.23-0141

Abstract:
In response to the return dispute between buyers and sellers in online transactions, e-commerce platforms have introduced return freight insurance to share the risk of product returns, but lenient return policies can also contribute to excessive returns. Thus, third-party insurance companies were incorporated into the Stackelberg game, which was dominated by the manufacturer and followed by the online retailer. Taking into account return behavior and freight insurance sensitivity of risk-averse consumers, three pricing return models with the participation of multiple decision makers, namely, the seller's freight insurance, the buyer's freight insurance and the shared freight insurance, were developed to analyze pricing decisions and freight insurance strategies of the online retailer. The results show that consumers’ risk aversion attitudes benefit to reduce the product price and freight insurance price, thereby increase market demand and profits for all members involved. The co-sharing mechanism for freight insurance can be effective in mitigating customer loss, and when the return rate is low, consumer preferences for return freight insurance are advantageous for the profitability of the overall supply chain.

[Abstract](228) [FullText HTML] (111) [PDF 1073KB](12)

2024 Vol. 38, No. 2