Study of dynamic vibration characteristics and suppression of CNC machine tool during operation

The rapid development of aerospace, automobile, national defense and other manufacturing industries has continuously improved the performance requirements of high speed and high positioning accuracy of the CNC machine tool feed system. As the thermal deformation error increases, the system structural rigidity decreases, the vibration increases, and accuracy of machine tool reduces. Existing research mainly focuses on the properties of mechanical and single thermal feed system, and less considers the dynamic performance under the action of thermal-mechanical coupling. For the improvement of feed system performance, it is very beneficiary. This paper takes the high-speed tool of CNC feed system as objective, combined with the actual working conditions to analyze the thermal characteristics, dynamic characteristics and vibration characteristics of the system under the effect of thermal-mechanical coupling. The thermal resistance and convective heat transfer of the key joint surface, the application of moving thermal loads, and the establishment of a simulation model to complete the steady-state temperature field, transient temperature field and thermal-structure coupling analysis. The results show that the maximum temperature rise of the feed system is 21.08 °C, The maximum thermal deformation is 17.264 um. The study found that the parameters such as flow rate and airflow temperature have a significant impact on the cooling effect, so the cooling device was further optimized. This paper proposes a control method for cutting chatter of CNC machine tools based on coupling of characteristics of thermal and mechanical. The thermal characteristic of the feed system and the thermal-mechanical coupling vibration characteristic test provides the maximum temperature error of 3.2 %, verifying the correctness of the theoretical method and analysis model. The highest temperature obtained by the test is 39.7 °C, indicating that the high-speed feed system has a large thermal effect. The relative error of the vibration amplitude of the test and simulation is 12.5 %, which verifies coupling in terms of thermal-mechanical. The accuracy of the vibration analysis method; the experiment depicts that the vibration amplitude increases by 19.7 % under the coupling effect of thermal and mechanical, indicating the effectiveness of dynamic characteristics of the high-speed feed system considering the thermal-mechanical coupling effect

Architecture education: rubrics in Google Classroom as a tool of improving the assessment and learning

Blended learning has emerged as a promising approach in architecture education, combining face-to-face instruction with online tools such as Google Classroom, etc. for teaching and learning as well as assessment. The rubrics is a helpful grading tool that the instructors can use to rate the students’ work in a more standardized, transparent, and easy way. The well-designed rubrics can enable the students in recognising their areas of strength and weakness and it will also help them to improve the quality of their work. Although the rubrics have some limitations, several studies show that they can help teachers communicate their expectations more effectively. In this paper, the researchers discussed the effect of using the rubrics in the Google Classroom in architecture education. The rubrics were developed in Google Classroom to evaluate the main task of the subject i.e., assignments for the students of Bachelor of Architecture. The data was collected from the students through a questionnaire that was developed using the web-based Google Forms platform. The marks obtained in the assignments and the data collected through the questionnaire were presented graphically for ease of understanding. Results indicate that rubrics using Google Classroom facilitate a clearer understanding of expectations, promote consistency in grading and feedback, increased transparency, and support student self-assessment and reflection. The integration of rubrics within Google Classroom enhances students’ engagement, motivation, and overall learning experience

Innovation of an effective blended learning technology in architectural engineering and its validation by response data analysis

With the availability of countless choices of tools and technologies through computers and the internet, blended learning technology is further enriched by non-conventional powerful modes of online synchronous and asynchronous interactions between learners and instructors. The questionnaire was developed by using the web-based Google Forms platform and shared with architects and students of architecture by using WhatsApp and Gmail as the primary source of distribution. In light of the Council of Architecture’s Minimum Standards of Architectural Education Regulations 2020 Recommendations, All India Council for Technical Education’s Report, and Bloom’s Taxonomy, the research-based learning technology is found to be the most effective learning technology due to its active nature. Therefore, this fact was validated by obtaining the response regarding the attitude and understanding of all the stakeholders in architectural engineering viz. learners, teachers, and professionals towards research-based learning technology. All the respondents strongly supported the concept of introducing research-based learning technology in architecture education from the undergraduate degree level

Go green in architecture

The term "Go Green" is a widely used term having a wide variety of meanings depending on who uses it. Going green may be perceived in three simple steps "conserve energy, reduce pollution and save money" in our day to day chorus. More you achieve them, more you are going green. It may also be the way of life in which individuals are conscious of how their activities are affecting the environment? Clean and green environment is the key requirement of quality life. An architect’s responsibility is to train himself and to educate his clients to apply the principles of go green in designing and construction of buildings i.e. minimal use of energy that too from low-cost environment-friendly non-conventional sources of energy with energy harvesting ideas in operation and selective use of the low-cost environment-friendly materials in construction. These two are the major factors in controlling environmental pollution. The use of green construction materials, green energy resources and principles of green architecture will lead to the green buildings. In this presentation, the authors will discuss the different green energy resources, green construction materials and the green architectural strategies to construct green buildings for sustainability and quality life