Engineering Background Research Articles

Exploration and Practice of the Construction Path of the Integration of Ideological and Political Education with Engineering Courses under the Background of New Engineering

Exploration and Practice of the Construction Path of the Integration of Ideological and Political Education with Engineering Courses under the Background of New Engineering

Reform and Practice of the Teaching Management System of the Multi-disciplinary Cross-fusion Cultivation Mode under the Background of New Engineering

Reform and Practice of the Teaching Management System of the Multi-disciplinary Cross-fusion Cultivation Mode under the Background of New Engineering

Reform and Exploration of Single-chip Microcomputer Teaching in International Talent Training under the Background of new Engineering

Reform and Exploration of Single-chip Microcomputer Teaching in International Talent Training under the Background of new Engineering

Construction and exploration of practical education system of applied chemistry under the background of new engineering

Chemistry is an experimental science. Practical teaching is a significant link in the cultivation of students majoring in chemistry to foster students' practical, professional application, and innovation abilities. Based on the investigation and analysis of the problems existing in the cultivation of the practical ability of applied chemistry major, take specific measures, such as constructing the practical teaching system of applied chemistry major, explored a better practical teaching system for students of applied chemistry major; applied to the reform and innovation of training mode of students majoring in applied chemistry and achieved good results.

Teaching Reform and Practice of Basic Chemistry Experiment Course in Colleges and Universities under the Background of New Engineering

Teaching Reform and Practice of Basic Chemistry Experiment Course in Colleges and Universities under the Background of New Engineering

On the training of scientific personnel at post-graduate school

The possibilities of modern packages of symbolic mathematics for the scientific work of novice researchers in mathematics are discussed. Counterexamples for Schwartz theorem on the equality of mixed derivatives are considered. It is shown how you can use the graphical and computational capabilities of symbolic mathematics packages for their analysis so that novice researchers with the traditional engineering background in mathematics understand them. The article focuses on the problems of ambiguous perception of the PC user of three-dimensional graphic images on the monitor screen. This is important for operators who make decisions based on information obtained in a mixed virtuality or mixed reality environment. The analysis of counterexamples for the Schwartz theorem is carried out using both classical mathematics and possibilities of symbolic mathematics packages. It is shown that this assertion is not necessary. During the virtual demonstration of three-dimensional graphic objects, recommendations on their perception in terms of information environments are provided.

Research on stress evolution law and failure characteristics of top coal in fully mechanized caving of extra-thick coal seams

In this study, based on the engineering background of the No. 8222 working face of the Tashan coal mine in Shanxi Province, China, true triaxial experiments were carried out on Geotechnical Consulting and Testing Systems rock mechanics testing machine using cubic coal samples, and the numerical simulation was conducted through the FLAC3D software. Moreover, the stress evolution law of different layers of extra-thick coal seams and the failure mechanism of top coal in the fully mechanized caving were investigated, and the failure structure model of top coal was established. The results show that there are differences in the principal stress values at different layers of the top coal.

The in silico lab: Improving academic code using lessons from biology

"Good code" is often regarded as a nebulous, impractical ideal. Common best practices toward improving code quality can be inaccessible to those without a rigorous computer science or software engineering background, contributing to a gap between advancing scientific research and FAIR practices. We seek to equip researchers with the necessary background and context to tackle the challenge of improving code quality in computational biology research using analogies from biology to synthesize why certain best practices are critical for advancing computational research. Improving code quality requires active stewardship; we encourage researchers to deliberately adopt and share practices that ensure reusability, repeatability, and reproducibility.

Asymmetric Damage Mechanisms and Prevention Technology in Large-Section Gob-Side Entry Retaining

Based on the deformation and damage characteristics of the surrounding rock in a large-section gob-side entry retaining and combined with field observations and an analysis of the dominant factors, an overall deformation control plan is formulated. The plan mainly includes a structure of high strength, high stiffness and high ductility for roadside support; the reinforcement of the roadway-in support; and the setup entry hydraulic fracturing pressure release mechanism and advanced long, horizontal borehole “fracturing-jet” pressure relief technology. Industrial field tests were completed taking Tangan coal mine as the engineering background. The research shows that the large-section gob-side entry retaining has the typical “asymmetric” overall deformation and damage characteristics, including top coal sinking along the inner side of the roadside support, the whole roadside support structure skewing, and even splitting damage; floor heaving; and the coal-side bolt support structure basically losing support ability and bulging out from the coal side. The dominant factors of deformation damage are disintegration of the floor mudstone by water and deflection deformation under horizontal stress, splitting damage in the concrete roadside support under asymmetric load, damage and expansion due to the insufficient strength of the coal side support, strong dynamic pressure on the roof, and the mutual influence of support and pressure relief. The industrial test shows that the deformation control scheme optimizes the stress environment of the gob-side entry retaining space, the deformation control effect is remarkable, and the roadside fully meets the reuse requirements.

Physical overloading test for 3D printed caverns: Failure performance and supporting effect

Excavation of a large underground cavern often induces the unstable behavior of the surrounding rock due to intensive stress redistribution; thus, reasonable supporting measurements are necessary. A new 3D print-based physical overloading test method is presented for exposing the failure performance of caverns and the reinforcing effect of supported structures. Taking the Yingliangbao underground caverns as an engineering background, a physical model and supporting elements for the cavern groups are manufactured first by 3D printing (3DP) technology, including a multi-cavern 3DP sand model, 3DP polymer lining and metal bolt. Further overloading tests for the printed physical models are carried out, and the progressive failure performances are exposed, including crack extension, model loading evolution, local strain development, etc., which indicate that shear failure often appears on the mid-wall. Moreover, the overloading test for the supported cavern model also quantitatively reveals the reinforcing role of the 3DP polymer lining and metal bolt, such as increasing the bearing capacity by more than 10%. A corresponding numerical back analysis is further applied to certify the progressive failure process of multiple caverns under overloading conditions, which provides some cures for the supported bolt position and depth in multiple caverns. This method can enrich the physical model test and guide the support design for underground engineering construction.

Research on disturbance rejection motion control method of USV for UUV recovery

AbstractThe recovery of unmanned underwater vehicle (UUV) by unmanned surface vehicle (USV) has the characteristics of autonomy, safety, and efficiency. Taking the recovery of UUV by USV as the engineering background, this paper studies the guidance and anti‐interference motion control of USV in the recovery process. Aiming at the problem of dynamic guidance when recovering UUV, the USV guidance strategy for UUV recovery is studied. Fuzzy guidance is introduced as the dynamic terminal guidance method, and a layered guidance strategy combining classical guidance and fuzzy guidance is proposed. On the basis of the theory of compact form dynamic linearization‐based model‐free adaptive control (CFDL‐MFAC), the motion control of USV in the process of recovering UUV under the influence of model perturbation, external interference, and other uncertainties is studied. Theoretical analysis and experimental results show that there is a contradiction in the matching of dynamic change speed between the USV heading control subsystem and CFDL‐MFAC. By introducing the difference item into the standard control criterion to weaken the integral effect in the heading control subsystem of USV, a difference‐type compact format model‐free adaptive control method (DCFDL‐MFAC) is proposed, and the stability of DCFDL‐MFAC method is proved theoretically. The effectiveness and practicability of the proposed method are verified by simulation tests and field tests of “Dolphin IB” small USV.

Research on Optimization of Large Flow Hydraulic Punching Process in Zhaozhuang Mine

Taking hydraulic punching test of Zhaozhuang Mine as engineering background, by comparing the field application effects of different hydraulic punching processes, the relationship between coal moisture content around the borehole blockage and gas extraction effect was monitored and analyzed. The following conclusions were drawn: the occurrence of borehole blockage was the result of the comprehensive action of coal slag particle size and slag discharge capacity of punching return water. Blocking the borehole led to the accumulation of a large amount of punching high-pressure water and coal slag in the borehole, which compressed and infiltrated the surrounding coal body and reduced gas extraction efficiency of borehole. Under the condition of the same amount of coal produced by punching, the different punching methods led to the great difference in the influence radius of punching. The large flow three-stage coal-breaking hydraulic punching system developed according to the borehole blockage mechanism can effectively reduce the particle size of coal slag, increase the punching flow, effectively avoid borehole blockage, and improve gas extraction efficiency of borehole.

Research on Path Planning and Control Method for Secondary Autonomous Cutting of Cantilever Roadheader in a Large-Section Coal Roadway

A cantilever roadheader is the main tunneling equipment for underground coal mine roadways. The key to the safe, efficient and intelligent development of coal enterprises is to achieve the autonomous cutting and intelligent control of the cantilever roadheader. In order to realize the automatic cutting shaping control of a large-section coal roadway, the path planning and control method of secondary automatic cutting of a cantilever roadheader were studied. The Wangjialing 12307 belt roadway was used as the engineering background, the vertical displacement law of the roadway roof under different cutting paths was simulated with the FLAC 3D software, the reasonable cutting path was determined according to the actual situation, and the underground industrial test was carried out. The simplified model and spatial position and attitude coordinate system of the roadheader were established, the kinematics of the roadheader was analyzed, and the position and attitude expression of the cutting head center in the roadway coordinate system was obtained. The simplified model of the cutting head was established, the position expression of the pick in the roadway coordinate system was derived, the position coordinate of the inflection point and the cutting step distance were determined according to the relationship between the cutting head and the roadway boundary, and the cutting path control flow was designed. Finally, the reliability of the cutting path control method was verified with a MATLAB simulation. The research works provide a theoretical foundation for path planning and control to realize “secondary autonomous cutting of cantilever roadheader”.

Teaching Reform of Machine Vision in Higher Education Under the Background of Internet Plus and New Engineering

Nowadays, the Internet is becoming more and more widespread in life, production and learning. The use of Internet technology in colleges can help stimulate students' interest in learning, optimize the cultivation mode and improve teaching efficiency. With the promotion of New Engineering teaching mode in China, the practical ability of students is improved. At present, for students in the major of mechanical and electronic engineering, it has become one of the core competencies in employment and entrepreneurship to learn and master machine vision technology. In this paper, under the background of Internet plus and New Engineering, a new teaching mode of machine vision curriculum is proposed by the combination of curriculum theory and practice. Some exploration of teaching reform is introduced from four aspects, namely, ideological and political education, teaching content, teaching method, and the teaching evaluation method. Through the above reform measures, it can improve students' ideological and political quality, stimulate students' interest in learning, guide students to establish a complete knowledge system, and improve students' practical ability and comprehensive innovation ability.

Design of Biochemistry PBL teaching cases suitable for engineering education

Engineering education is an important part of China's higher education. With the deepening of the connotation of new engineering talents training, it is timely to carry out the curriculum reform in all directions and improve the quality of engineering talents. In order to highlight the characteristics of fostering new engineering talents, specialized courses and practical courses are becoming the focus of curriculum teaching reform. However to this end, it is urgent to explore how to strengthen fostering talents with engineering characteristics in the professional foundation courses. Taking the biochemistry course as an example, problem-based learning teaching methods were employed, appropriate teaching cases were selected, scientific and technical problems based instructional designs were explored, and students were guided to condense, analyze and solve problems. This study aims to transform the learning attitude of students from "passive" to "active", enhance students' thinking skills, highlight the engineering application of science and technology, lay the foundation for continuous and even lifelong learning, and provide a reference for fostering talents under the new engineering background.

Improvement of Reinforcement Performance and Engineering Application of Small Coal Pillars Arranged in Double Roadways

The supporting technology of retaining small coal pillars in a double roadway layout can effectively relieve the tension of mining and excavation replacement and improve the coal recovery rate. The critical difficulty is that the supporting structure on both sides of the small coal pillar has not established an effective mechanical connection, and the improvement of the bearing capacity of the coal pillar is limited, so it is difficult to achieve long-term stability control of the small coal pillar. Taking the 301 and 302 working faces of Gaojiapu Coal Mine as the engineering background, this paper first constructs the overburden structure model of the whole process of mining with small coal pillars in a double roadway layout, obtains the load calculation and strength calculation methods of small coal pillars through the analysis of the mechanism of small coal pillars surrounding rock mechanics, and gives the selection design of support parameters of anchor cables and concrete filled steel tubular piers; Secondly, the influence rules of physical and mechanical parameters such as axial load, elastic modulus and residual strength of anchor solid under different reinforcement methods and the lateral reinforcement coefficient of anchor cable are obtained through experiments. Finally, the support parameters and the coal pillar width are reasonably designed. The field monitoring data show that the reinforcement technology of a small coal pillar with anchor cable as the main body can effectively control the deformation of the small coal pillar, which has specific guiding significance and application value for solving the long-term stability control problem of small coal pillar under the influence of mining.

Asynchronous finite-time [formula omitted] filtering for linear neutral semi-Markovian jumping systems under hybrid cyber attacks

This paper concerns asynchronous finite-time event-triggered H∞ filtering design for neutral semi-Markovian jumping systems (S-MJSs) under malicious hybrid attacks. Firstly, based on event-triggered mechanism (ETM), time-delay and random cyber attacks, asynchronous filtering is addressed. Secondly, sufficient conditions are deduced that the filtering error system is stochastic H∞ finite-time bounded (SH∞FTB). Meanwhile, we provide novel results on stochastic H∞ finite-time contractively bounded (SH∞FTCB) for the S-MJSs under ETM and cyber attacks. Finally, an example with engineering background is presented to exemplify the effectiveness of our results.

Quantitative evaluation method of human comfort under the influence of blast vibration based on human physiological indexes and its application

To reasonably assess the impact of blasting disturbance on personnel in the adjacent area and to protect the safety and physical and mental health of personnel, it is the key to construct a human comfort evaluation system under the impact of blasting vibration. In view of the uncertainty of human subjective feelings in the existing evaluation system of human comfort under the influence of blasting vibration, the human vibration response experiment is carried out by simulating blasting vibration through a shaking table, and the quantitative relationship between blasting vibration parameters, ECG indicators, and human subjective feelings is analyzed by combining with human ECG indicators to construct the evaluation system of human comfort under the influence of blasting vibration. At the same time, the evaluation system is applied to the actual project with Wuhan Metro Line 5 as the engineering background by combining numerical calculation methods. The results show that: the vertical direction is the main vibration direction affecting human comfort, and the impact of vibration on the human body is related to the main vibration sensation parts of the human body, and the degree of impact gradually increases when the main vibration sensation parts moves up from the feet to the head; There is a quantitative relationship between the decreased ratio of human ECG index RMSSD and blasting vibration parameters as well as human subjective feelings, when the decrease ratio of human RMSSD is >0.28, the extent to which the human feels the degree of annoyance cannot be ignored, and the vibration velocity and frequency (0.7 cm/s, 80 Hz) in the vertical direction of the ground surface at this time can be used as the control threshold of blasting works in the adjacent densely populated areas. It is recommended that the maximum explosive charge in the single delay of the subway tunnel blasting excavation does not exceed 0.32 kg.

Non-Major Students’ Perception on the Application of Gamification and Simulation in Electrical and Electronics Engineering Courses at Universities in Malaysia

In the field of electrical and electronics (E&E) technology that is evolving rapidly, the Ministry of Higher Education Malaysia emphasizes universities to ensure that the expected non-major E&E engineering graduates are fully equipped with the skills to fulfil market needs. However, it is challenging for non-major students to understand the topics taught to them through the methods as they are conventionally being delivered. Therefore, gamification and simulation such as Kahoot, Quizizz, Multisim and CircuitMod have been applied in the university to facilitate formative assessment in order to enhance interest and understanding, and also accomplish learning more effectively among non-major students. Hence, this research aims to examine the non-major students’ perception of the implementation of gamification and simulation in class for face-to-face and online settings. To achieve this, a set of questionnaires was adapted with some modifications for the purpose of data collection. It was distributed to the students from random public universities in Malaysia who are currently enrolled in E&E engineering courses at their respective universities which majority of them are from a mechanical engineering background. Research questions concentrate on the advantages and students’ perceptions of gamification and simulation in E&E engineering courses. The collected data has been analyzed using descriptive statistical analysis. Based on the perceptions of the participating non-major E&E engineering students, the majority of the respondents agreed that gamification and simulation provide a better learning experience with the highest score mean of 4.22. Moreover, gamification and simulation boost students' ability to learn, motivate them, increase their understanding, promote their well-being, and increase their achievement academically. Students hold a positive perception with 4.20 mean score, stating that it is suitable for application in the learning process as it is easy to use, fun, motivating, and more efficient. The results provided would encourage educators in Malaysian universities to better meet the needs of teaching non-major students with their lessons.

A New Research Scheme for Full-Scale/Model Test Comparisons to Validate the Traditional Wind Tunnel Pressure Measurement Technique

A new research scheme for a full-scale/model test comparison is proposed for effectively validating the wind tunnel pressure measurement technique in this article. With the new research scheme and using quantifiable data, future full-scale/model test comparisons are expected to reasonably disclose the main problem with the traditional atmospheric boundary layer wind tunnel pressure measurement technique with regard to the Reynolds number (Re) effects, the aero-elastic effects and the flow characteristic effects. Based on the engineering background of the Peng-cheng cooling tower, it was quantified by using the new research scheme that the average relative errors of the mean wind pressure coefficients are 52.39%, 1.87% and 35.91% for the Re effects, the aero-elastic effects and the flow characteristic effects, respectively. In view of the fluctuating wind pressure coefficients, the average relative errors are 97.58%, 21.14% and 20.20% for the Re effects, the aero-elastic effects and the flow characteristic effects, respectively. These suggest that Re effects are extremely significant for pressure measurement model tests of circular cylindrical structures, and flow characteristic effects are noticeable too. They should be mitigated using effective approaches, i.e., increasing the model surface roughness and placing the actively controlled devices at the beginning of the wind tunnel’s working section, respectively. Additionally, the key field measurement technique adopted (i.e., the calculation of the reference static pressure) and details of manufacturing the aero-elastic pressure measurement model for the present study are also expounded in the article for reference.