Domestic Machine Research Articles

Research on the Establishing of the Control System of the SlS Rapid Prototyping Machine

In the current time, mastering the rapid prototyping technology and equipments is a complicated question in Vietnam because of shorting of ability and finance for investment. In order to save currency from imported machine, the demand of research and mastering the new technology of rapid prototype machine, especially a program of control motion in Selected Laser Sintering (SLS) rapid prototype machine, is essential in our country in the purpose of manufacture a domestic SLS rapid prototype machine. This paper presents the design of a control program for the SLS rapid prototyping machine that is corporated to the hardward of our typical manufactured SLS machine in our laboratory. From the result of empiriments we considered that the performed program of control motion responded all the requirements of control as well as experimental adjustments of the technological parameters in our manufactured SLS machine. The results of testing the program via manufacture model products by SLS rapid prototyping machine are accepted.

Research on agricultural product price forecasting model based on improved BP neural network

BP neural network algorithm and genetic algorithm are the core algorithms in machine learning algorithms. Major mainstream internet companies and financial institutions have begun to use machine learning algorithms to fit the data, which directly stimulates the development of domestic machine learning algorithms. The research of this paper shows that the algorithm optimization has strong advantages in modeling real estate data, but the current neural network training process cannot be explained. With the development of technology and artificial intelligence, more progress will be made in the area of GA optimization of BP neural networks.

Hard Cap Espresso Machine Extraction of Polyphenolic Compounds from Pulses

A hard cap espresso machine was employed for the extraction of polyphenolic compounds from food samples as dry legumes and pulses. 100 mg of ground dry sample was mixed with a dispersing agent and placed in a refillable stainless steel capsule with a borosilicate filter. A complete polyphenol extraction was achieved by using 150 mL ethanol 50 % (v/v) in water and determined by Folin-Ciocalteu spectrophotometric method. The method provided a limit of detection of 0.4 mg g<sup>-1</sup>. The whole extraction procedure was achieved in less than one minute using the mild extraction conditions of 72°C and 19 bars given by the domestic machine. Fifteen varieties of food samples (3 lentils, 6 beans, 5 chickpeas, and 1 sorghum) were purchased in Spanish and Tunisian markets and analyzed by the proposed procedure. Obtained results were compared with those found by a reference extraction method based on ultrasound-assisted extraction, being statistically comparable. The content of polyphenolic compounds in the analyzed commercial samples varied from 4.6 to 5.5 mg g<sup>-1</sup> for lentils, from 3.4 to 5.8 mg g<sup>-1</sup> for beans, from 2.2 to 3.5 mg g<sup>-1</sup> for chickpeas, and 3.0 mg g<sup>-1</sup> for sorghum.

Проблема оновлення автопарку Збройних Сил України та формування перспективного типажу військової автомобільної техніки в аспекті сучасних тенденцій

Розглянуто сучасний стан парку автомобілів та військової автомобільної техніки (ВАТ) Збройних Сил (ЗС) України. З аналізу тенденцій розвитку ВАТ в арміях НАТО та необхідності оновлення застарілого парку автомобілів ЗС України сформовано перспективний типаж повнопривідної ВАТ та агрегатно уніфікованих бойових і спеціальних колісних машин з врахуванням потенціалу вітчизняного машинобудування та критичного імпорту агрегатів і вузлів.

January 1993

UK machine tool industry R&D – the country's chance to lead in Europe; domestic machine tool builders win auto orders; UK CMM pioneer bought; domestic & global cooperation; a globalising auto industry; mill-turns more widely employed in UK

Problems of modernization and technical re-equipment of Russian machine-building enterprises

Article substantiates the need for modernization and technical re-equipment in Russian Federation. The goal of the research and tasks for achieving this goal has been determined. The existing conditions for development of machine building complex of Russian Federation in recent history and dynamics of economic indicators that characterize it in recent years are considered. Trends in domestic machine building industry are revealed, which directly characterize the slowdown in the rate of country's economic functioning. Urgency of modernization and technical re-equipment of machine-building, its upgrading on the basis of wide introduction of the latest scientific and technical achievements and advanced technologies, is underlined, as without advancing development of machine building, it is impossible to solve problems of technological safety and problems relating to social sphere and standard of living of country's population. Particular attention is paid to the main problems and tasks of modernization, technical re-equipment of engineering enterprises. It is noted that at present stage the demand for modernization of Russian engineering is obvious. The results of the research show how urgent it is to change the forms and methods of production organization, re-equipment of technological capacities, and introduction of modern management systems. However, in order to correctly formulate the main priorities and directions of modernization, an in-depth analysis is needed.

EXPORT ACTIVITY OF MASHINE-BUILDING ENTERPRISES WITHIN TRANSFORMATION OF UKRAINIAN FOREIGN TRADE

Urgency of the research. Transformational processes in Ukrainian economy and its integration to European and world economic areas set new challenges to domestic machine building. Target setting. In modern conditions, national machine building suffers from huge economic crisis and loses its competitive fight in domestic and, what is sufficiently important for the economy of Ukraine, in foreign markets. Actual scientific researches and issues analysis. The operation of Ukrainian machine building enterprises, including that on the international markets, has been studied by:Yu. M. Bartyshevska, T. A. Kalna, N. V. Balabanoova, N. V. Ravlyk et al. Uninvestigated parts of general matters defining. The situation in international markets of machine building products as well as in the national economy is changing dynamically, causing new problems and challenges for Ukrainian machine building enterprises. It requires more profound research of problematics and perspectives of export activities of the enterprises. The research objective. The goal of the article is to distinguish problems and perspectives of export activity of domestic machine building enterprises, based on the estimation of Ukrainian machine building dynamics and its foreign economic activity, taking into consideration the transformation of country’s foreign development vector. The statement of basic materials. The article deals with the study of dynamics of machine building development in 2006 – 2016 stressing foreign economic (export) activity. Problems of export activity of machine building enterprises in Ukraine have been outlined, among them: the level of competitiveness, low quality of products, problems with development and production of innovative goods, deficit of investment resources. The special attention is given to perspectives of such an activity for the area under consideration. Conclusions. The research conducted has allowed to formulate certain problems of export activity and to define perspectives of foreign economic activity of national machine building enterprises, occured in terms of foreign economic transformation of the country.

Relationships between development factors of the Arctic Zone of the Russian Federation

The article describes long-term possibilities for participation in domestic machine engineering in major economic projects. The basic relationships between economic, institutional, and technological factors of regional development are identified. Some ideas are proposed for the substantiation of innovative development programs for the Arctic Zone of the Russian Federation.

문형머시닝센터의 구조해석을 통한 최적화에 관한 연구

Recently, as the demand for high efficiency, multi-function machine tools has increased, domestic machine tool industries are investing in research and development for Gantry-Type Machining centers. In this thesis, for the purpose of evaluating machining accuracy and designing a machine tool structure, a simplified model of the main frame is suggested. The results show the general characteristics of the optimum design, and the approach is shown as practicable for the preliminary design analysis and improvement of a conceptual design of a Gantry-Type Machining center. This paper's results are expected to improve the static characteristics of Gantry-Type Machine centers. The three-dimensional finite element models proved that the modeling method might be applied to real machine tool structures.

국내 기계등급구조재의 등급구분체계 및 기준설계값 결정방법 연구

국내외 기계등급제재목(구조재 및 층재)의 등급기준 및 설계강도 산출방법을 비교 분석하고 국내 제재산업 실정을 고려한 평균 탄성계수(modulus of elasticity, 이하 MOE) 기준방법 적용을 제안하였다. 먼저 올바른 기계등급제재목 기준 정착을 위해 기계등급구조재와 기계등급층재의 공통점과 차이점을 설명하였다. 최소 고정 MOE 기준 등급을 사용하는 국내 기준은 등급구분에는 편리하나 휨강도(modulus of rupture, 이하 MOR) 예측과 자원이용도 측면에서는 효율성이 낮은 것으로 파악되었다. 해외에서 사용되는 평균 MOE 기준 방법은 초기 컴퓨터 기반 작동을 요구하나 MOR-MOE 직선회귀에 근거한 합리적인 MOR 예측과 품질관리 측면에서 효율성이 높은 것으로 분석되었다. 무엇보다도 현 국내 기계등급구조재 등급체계는 수종별 강도 특성을 반영하지 못하고 있다는 것이 가장 큰 문제점으로 분석되었으며 이러한 결과를 기반으로 MOR-MOE 직선회귀분석에 근거한 기계등급제재목 등급기준 및 기준설계값 산출방법 적용을 제안하였다. 이를 통하여 궁극적으로 부가가치가 높은 국산 기계등급구조재 생산 활성화를 이루고, 기계 등급구조재의 층재 전용 가능에 따른 구조용 집성재 가격경쟁력 제고 효과를 얻을 수 있다고 사료되었다. Based on comparative studies on standards and grading procedures of machine graded lumber in Korea and other countries, this study proposed a procedure of determining the grade classification and design strengths of domestic machine graded lumber. Differences between machine stress rated lumber and E-rated laminations were detailed in order to clarify the need for the procedure improvement. To this improvement the use of average MOE requirement for grading was introduced instead of the fixed minimum MOE requirement which is currently used in the Korean standards. It was found that the fixed minimum MOE requirement method was easier for an inspector to grade but, less efficient as a strength predictor than the average MOE requirement method. The advantage of average MOE requirement method is statistically MOR-MOE regression-based MOR prediction and highly efficient in quality control though it requires a computer-aided operation system in an initial setup. A major weakness of the current Korean grading system was found that different strength characteristics depending on wood species were not reflected on the grade classification and the tabulated allowable design stress. The proposed procedures were developed taking advantages of respective merits of both methods and based on MOR-MOE regression analysis. Through this procedure, the grades of machine stress rated lumber should be revised to become interchangeable with E-rated lamination, which would be beneficial to the cost competitiveness of domestic machine graded lumber and glued laminated timber industry.

Effect of the regimes of selective laser melting on the structure and physicomechanical properties of cobalt-base superalloys

In this article, we give a preferential regime of selective laser melting for the production of parts from a cobalt superalloy using a PTK-PS domestic machine, which can find application upon the production of components from various superalloys in the aviation and atomic industry and in the automobile industry. We have investigated the phase composition and determined the physicomechanical properties of the samples prepared under the preferential regime of selective laser melting. It has been established that the structure of the alloy obtained by selective laser melting consists of two supersaturated solid solutions based on the low-temperature hexagonal and high-temperature cubic cobalt modifications, which leads to an increase in the strength characteristics of the samples in comparison with the cast samples.

Trends of development of agricultural tractors’ designs

On materials of the Agrosalon 2014 exhibition, which has assembled leading domestic and foreign machine building companies, trends of development of agricultural tractors’ designs are considered.

Design on Book Sorting Device Based on the TRIZ Theory

Dueto the shortage of domestic and foreign books sorting machine, the innovativedesign for the book sorting device is carried out with a small volume, lowcost, high efficiency characteristics by using TRIZ theory. The sorting deviceconsists of lifting platform device and trolley rail unit, and it greatlyreduces the size and cost of production and sorts books into 22x9 categories, soit has larger applications prospect in college library. Research andapplication of TRIZ theory in mechanical product innovation design has a veryimportant theoretical and realistic significance.

Формирование проектной системы управления рисками промышленных предприятий

In the article the author systematizes thestages of evolutionary development of thescience of risk management, problems ofdevelopment of domestic machine building and proposed activities improve riskmanagement of industrial enterprises.In the work developed adequate to themodern state of the industrial productiontools in the risk management system ofthe enterprise.

THE FORMATION OF A PROJECT RISK MANAGEMENT SYSTEM OF INDUSTRIAL ENTERPRISES

In the article the author systematizes thestages of evolutionary development of thescience of risk management, problems ofdevelopment of domestic machine building and proposed activities improve riskmanagement of industrial enterprises.In the work developed adequate to themodern state of the industrial productiontools in the risk management system ofthe enterprise.

Direct foreign investments in the domestic machine tool industry

The paper discusses individual cases of direct foreign investments in the domestic machine tool industry. The characteristics of foreign investments and the factors of their implementation are summarized. A solution for smoothing the ambiguous impact of increased foreign investment is offered.

Turbine repair at Nesjavellir geothermal power plant: An Icelandic case study

During a quadrennial inspection of a 30MW Mitsubishi steam turbine at Nesjavellir geothermal power plant, corrosion products were found on the last set of labyrinth packing in the gland seal system which resulted in erosion corrosion of the turbine rotor. The rotor had worn by approximately 8mm. Because of the tight timeframe of the overhaul, it was decided to repair this failure on site using the experience of the staff and domestic industry. Labyrinth seals were built by a domestic machine shop, decreasing cost and shutdown time dramatically. This article describes the occurring failure and how it was repaired within days with cooperation between the energy company and domestic industry. It further discusses probable causes for such failure and how it may be prevented. The article describes in essence how valuable it can prove to build maintenance knowledge domestically in the geothermal sector.

Effects of ultrasonic laundering on the properties of silk fabrics

Silk fabric wrinkles or creases easily during conventional domestic machine laundering due to its poor wet resilience, leading to an undesirable fabric appearance and difficulties in daily care. In this research, ultrasonic energy was used to clean silk fabrics, aiming to improve their after-wash appearance. It was found that ultrasonic laundering performed much better in removing common stains from silk fabrics and in maintaining the fabric appearance and dimensions compared to machine laundering. Ultrasonic agitation caused a little more fading effect than that caused by mechanical agitation. After 15 laundering cycles, the K/ S value of the fabric laundered by ultrasonic agitation was only 2.7% lower than that laundered by washing machine, so the difference was not significant and could be acceptable. Ultrasonic laundering also resulted in less fiber damage to silk fabrics. The investigation indicated that the introduction of ultrasonic agitation in laundering could produce a significant benefit in the laundering of silk fabrics.

Analysis on Application of Domestic CNC Machine Tools in the Field of Aviation

CNC equipment as carriers of the advanced manufacturing technologies, to accelerate the rapid development of China's aviation industry has a pivotal role. In this article, the development of intelligent Aero-CNC machine tools is studied, the reliability improvement of domestic CNC machine tool is illustrated, the specific applications of domestic CNC machine tools is analyzed in the field of aviation, the development direction of China Aero-CNC machine tool is pointed out, it has a strategic significance for the revitalization of China's aviation industry.

Strength, service life, and safety of machine systems

Taking into account basic scientific and applied problems set by the Russian Academy of Sciences, the Institute of Machine Science has become the national center for the development of machine science as one of the principal trends in engineering sciences in the Soviet Union and Russia, that form the basis for the development of most sectors of the domestic machine building industry. The development and generalization of results of studies of strength and service life of structural bearing elements has been considered one of the Institute’s principal areas of activity. One of the most important tasks in perspective will be to improve traditional and new approaches to solving a complex of interrelated tasks on strength, service life, survivability, risk, safety, and security on the basis of results of past and future basic studies and applied developments in this field.