Science and Technology Development in Vietnam: Current Situation and Solutions

Science and technology play an important role in transforming growth models, improving productivity, quality, efficiency and competitiveness of the economy. This is a matter of vital significance to the existence and development of the country, and is an urgent requirement of the current industrialization, modernization and national integration in Vietnam. During 35 years of industrialization, modernization and international integration (1986 – 2021), science and technology in Vietnam have made important progress in all aspects, making a practical contribution to economic development - society, improve the quality of people’s life and consolidate national defense and security. However, science and technology in Vietnam today still has many shortcomings such as: The level of science and technology of social production remains low and backward compared to other countries in the region; low labor productivity; domestic businesses are still less interested in investing in research and development; investment in science and technology activities is low, structure is not suitable, efficiency is low; the contingent of science and technology staff lacks quantity, is weak in quality, and the structure is not suitable. These shortcomings have been affecting the demand for reform of an economic growth model to meet the requirements of rapid and sustainable development. In the coming time, to overcome the above problems, Vietnam needs to deploy a synchronous system of solutions.

A new study on dynamic adjustment of vibration direction angle for dual-motor-driven vibrating screen

For a dual-motor-driven elliptical vibrating screen, the driving frequencies of the two motors are studied in this paper and it exposes the significant influences of different driving frequencies on the vibration direction angle of the self-synchronous system. A dynamic model is established to demonstrate the new concepts and innovative ideas put forth in this paper. Simulink and prototype experiments are implemented to further study the influences of different driving frequencies on the phase angle and the vibration direction angle. The results of simulation and experiments shows that vibrating screen driven by the two motors can not only achieve a stable synchronization within a certain frequency range by changing the driving frequency of either of the two motors, but also the vibration direction angle significantly changes at similar but different driving frequencies. This is an important finding that has important significance for the future operations of dual-motor-driven vibrating screen in industry. The method developed in this study would be a valuable engineering tool which can be used in design and application of the screens and the screening operations.