scholarly journals Design of Grinding Machine Spindle

2018 ◽  
Vol 1 (1) ◽  
pp. 69-75
Author(s):  
Lukas Rudolf ◽  
Jiri Fries ◽  
Oldrich Ucen ◽  
Tomas Kubin ◽  
Lukas Kudrna
Keyword(s):  
Design Patterns ◽  
Design Theory ◽  
Design Solution ◽  
Position Change ◽  
Gravity Forces ◽  
Machine Spindle ◽  
Grinding Machines ◽  
Grinding Machine ◽  
External Forces

Abstract When grinding high demands are usually placed on the geometrical tolerances of the workpiece surface. For this reason, the spindles of the grinding machines are normally designed with requirements for a minimum position change of the grinding disks due to external forces and bending moments. The design theory of these spindles is relatively well elaborated, as it represents the most frequently used solution in practice. However, there are also cases where it is necessary to grind some hard-to-reach areas, using a great ejection of the spindle. In these cases, it is necessary to reassess the required geometrical tolerances with regard to its necessity to comply with the minimal changes in the position of the grinding discs due to the great ejection. Where it is necessary to maintain high geometrical tolerances, it is necessary to ensure a greater rigidity of the spindle. This rigidity is usually improved by increasing its diameter. By doing this we also increase the weight of the spindle that is heavily ejected, and thus its deformation can occur due to gravity forces. That is why it is necessary to analyse the deflection of the spindle depending on its ejection in the course of its design. In the case we increase the diameter of the grinder spindle the possible applicable grinding disc diameter decreases, due to the growing size of its housing. Any grinding of hard-to-reach surfaces is therefore done in particular to improve the quality of the surface with low requirements on the geometrical tolerances. This article deals with the design patterns for a spindle used in axial grinding for inner rotating surfaces. The article contains a spindle design solution and an analysis of its deflections, depending on its ejection, and the size of the passive forces.

scholarly journals KAJIAN PENGGUNAAN MESIN PENGGILING MOBILE TERHADAP MUTU BERAS UNTUK BEBERAPA VARIETAS PADI DI KABUPATEN SUMBAWA BARAT (Study on Mobile Milling Machine Utilization in Rice Quality of Several Paddy Variety at Sumbawa Barat Regency)

2018 ◽  
Vol 6 (1) ◽  
pp. 53-59
Author(s):  
Novi Dewi Sartika ◽  
Zuhriyah Ramdhani
Keyword(s):  
Rice Yield ◽  
Milling Machine ◽  
Average Yield ◽  
Rice Varieties ◽  
Grinding Machines ◽  
Machine Utilization ◽  
Rice Milling ◽  
Effect On Yield ◽  
Grinding Machine

Rice mill has a very important role, this role is reflected in the large number of rice mills that spread almost evenly throughout the rice production centers in Indonesia. The large number of rice mills scattered in some areas does not guarantee the quality of rice produced will be better. One of the areas that have used rice milling technology is Sumbawa Barat Regency. The grinding machines used in this area are mobile. Therefore, this study aims to analyze the effect of rice varieties used on the quality of rice from milling, to determine the quality of rice produced, and to determine the yield of the milling. This research was conducted by grinding Ciherang varieties, Cigelis and Infari 32 using mobile grinding machine each three replications. The result of this research showed that rice varieties had significant effect on yield and losses of milling. Infari 32 varieties yield average yield of 69.41%, followed by Cigelis varieties 62.75% and Ciherang 59.36%. Infari 32 varieties also resulted in the lowest shrinkage of 1.46% compared to Ciherang (3.48%) and Cigelis (2.95%). Keyword: Grinding machine mobile, quality of rice, rice, yield milled   ABSTRAK Penggilingan padi memiliki peran yang sangat penting, peranan ini tercermin dari besarnya jumlah penggilingan padi yang menyebar hampir merata di seluruh daerah sentra produksi padi di Indonesia. Besarnya jumlah penggilingan padi yang tersebar di sejumlah daerah tidak menjamin kualitas beras yang dihasilkan akan lebih baik. Salah satu daerah yang telah menggunakan teknologi penggilingan padi adalah Kabupaten Sumbawa Barat. Mesin penggiling yang digunakan di daerah ini bersifat berpindah-pindah (mobile). Maka dari itu, penelitian ini bertujuan untuk menganalisis pengaruh dari varietas padi yang digunakan terhadap mutu beras hasil penggilingan, menentukan kualitas/mutu beras yang dihasilkan, dan menentukan rendemen dari hasil penggilingan. Penelitian ini dilakukan dengan menggiling varietas padi Ciherang, Cigelis dan Infari 32 menggunakan mesin penggiling mobile masing-masing tiga kali ulangan. Hasil penelitian yang diperoleh adalah varietas padi berpengaruh nyata terhadap rendemen dan susut penggilingan. Varietas Infari 32 menghasilkan rendemen tertinggi rata-rata 69.41%, disusul oleh varietas Cigelis 62.75% dan Ciherang 59.36%. Varietas Infari 32 juga menghasilkan susut paling rendah 1.46% dibandingkan Ciherang (3.48%) dan Cigelis (2.95%).  Kata Kunci: Mesin penggiling mobile, mutu beras, rendemen giling, padi

JAVASCRIPT ASYNCHRONOUS PROGRAMMING

2019 ◽  
Vol 128 (2B) ◽  
pp. 5-16
Author(s):  
Tran Thanh Luong ◽  
Le My Canh
Keyword(s):  
Design Patterns ◽  
Source Code ◽  
Object Oriented ◽  
Exception Handling ◽  
Code Smells ◽  
Asynchronous Programming ◽  
Event Driven ◽  
Programming Patterns ◽  
The Impact

JavaScript has become more and more popular in recent years because its wealthy features as being dynamic, interpreted and object-oriented with first-class functions. Furthermore, JavaScript is designed with event-driven and I/O non-blocking model that boosts the performance of overall application especially in the case of Node.js. To take advantage of these characteristics, many design patterns that implement asynchronous programming for JavaScript were proposed. However, choosing a right pattern and implementing a good asynchronous source code is a challenge and thus easily lead into less robust application and low quality source code. Extended from our previous works on exception handling code smells in JavaScript and exception handling code smells in JavaScript asynchronous programming with promise, this research aims at studying the impact of three JavaScript asynchronous programming patterns on quality of source code and application.

scholarly journals Robust design of flash evaporators for must concentration applications in wine production

2018 ◽  
Vol 19 (2) ◽  
pp. 207
Author(s):  
Thomas Quirante ◽  
Yann Ledoux ◽  
Patrick Sebastian
Keyword(s):  
Environmental Impact ◽  
Product Quality ◽  
Robust Design ◽  
Volume Fraction ◽  
Wine Industry ◽  
Design Solution ◽  
Wine Production ◽  
Target Values ◽  
Industry Area

In recent years, flash evaporation processes have received an increased attention in the wine industry for must concentration applications. Specific constraints related to the wine industry area had lead to many improvements of flash evaporators initially designed for seawater desalination. In particular the quality of the vintage, the transportability of the system and the environmental impact are of main interest. Moreover, the preliminary design of such systems must also consider robustness criteria. Obviously, variations of temperatures and flow rates of liquids at the inlet of the process can dramatically impact the quality of the product at the system outlet. In particular, deviations from the target values of temperature and alcoholic volume fraction can lead to a severe degradation of the vintage. As it is common in product design to have multiple performance measures, the robust design problem is addressed using a multi-objective approach. A trade-offs is introduced between two main design objectives: (i) the improvement in overall performance (product quality, transportability, environmental impact and costs) and (ii) the lowering of the sensitivity of the product quality under uncertainty. These main objectives are related to several elementary objectives corresponding to design criteria and a preference aggregation method is used to formulate the two different design objectives. Objectives are linked to weighting parameters values equivalent to priority levels. The selection of the most preferred design solution is discussed according to different trade-off strategies. The generation of the Pareto set is addressed by the non dominated sorting genetic algorithm NGSAII. From computing results, our recommendations concern the compromise between performance and robustness of flash evaporators. In this context, the final alcoholic volume fraction of the wine is the most sensitive parameter, which justify to maintain a high value of evaporative capacity when designing this type of system.

New Active Online Balancing Method for Grinding Wheel Using Liquid Injection and Free Dripping

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Xining Zhang ◽  
Xu Liu ◽  
Huan Zhao
Keyword(s):  
Grinding Wheel ◽  
Time Varying ◽  
Residual Liquid ◽  
Grinding Wheels ◽  
Abrasive Particles ◽  
Balance Condition ◽  
Liquid Injection ◽  
Grinding Machines ◽  
The Relationship

Grinding is a vital method in machining techniques and an effective way to process materials such as hardened steels and silicon wafers. However, as the running time increases, the unbalance of grinding wheels produce a severe vibration and noise of grinding machines because of the uneven shedding of abrasive particles and the uneven adsorption of coolant, which has a severe and direct impact on the accuracy and quality of parts. Online balancing is an important and necessary technique to reduce the unbalance causing by these factors and adjust the time-varying balance condition of the grinding wheel. A new active online balancing method using liquid injection and free dripping is proposed in this paper. The proposed online balancing method possesses a continuous balancing ability and the problem of losing balancing ability for the active online balancing method using liquid injection is solved effectively because some chambers are full of liquid. The residual liquid contained in the balancing chambers is utilized as a compensation mass for reducing rotor unbalance, where the rotor phase is proposed herein as a target for determining the machine unbalance. A new balancing device with a controllable injection and free dripping structure is successfully designed. The relationship between the mass of liquid in the balancing chamber and the centrifugal force produced by liquid is identified. The performance of the proposed method is verified by the balancing experiments and the results of these experiments show that the vibration of unbalance response is reduced by 87.3% at 2700 r/min.

Optimization for Spindle of Jade Carving Machine Based on Fuzzy Reliability Theory

2010 ◽  
Vol 37-38 ◽  
pp. 801-805
Author(s):  
Huai Rong Shi ◽  
Yan Nian Rui
Keyword(s):  
Reliability Theory ◽  
Fuzzy Reliability ◽  
Design Quality ◽  
Combined Model ◽  
Mechanical Process ◽  
Fuzzy Variables ◽  
Mechanical Products ◽  
Machine Spindle ◽  
Full Consideration

In machines working under the effect of alternating stresses, the fatigue bending deflection occured occasionally. On the basis of the Fuzzy Reliability Theory and with full consideration of the fuzzy factors during mechanical process, the paper studied the fuzzy reliability optimal design for the hollow spindle of multi-functional jade carving machine and improved the design quality of the jade carving machine spindle by probing into the combined model constructed by the random variables and fuzzy variables. The design was approved to be advanced, reliable and practical in service and provided a new way for the design of multifunctional jade carving machine spindle and other mechanical products.

DETERMINING VIBROACOUS AND PART PROCESSING QUALITY ON AUTOMATED GRINDERS

2020 ◽  
pp. 21-31
Author(s):  
Я. Ш. Шамсадова ◽  
Х. Ш. Шамсадов ◽  
Х. Р. Визирова
Keyword(s):  
Process Monitoring ◽  
Action Plan ◽  
Processing Quality ◽  
Internal Grinding ◽  
Standard Level ◽  
Maintenance Work ◽  
Grinding Machines ◽  
Dynamic Quality ◽  
Reference Machine

В данной статье рассматриваются результаты испытаний внутришлифовальных станков SIW-4, для получения представления об уровне технологической надежности станков. Далее сформулированы рекомендации по ремонтно-профилактическим работам в случае его снижения, при испытаниях станков одной модели можно определить эталонный станок по качеству обработки и динамическому качеству, а затем наметить и реализовать в рамках системы мониторинга техно - логического процесса (СМТП) план мероприятий по повышению динамического качества станков до уровня эталонного. This article discusses the results of tests of SIW-4 internal grinding machines, to get an idea of the level of technological reliability of the machines. Further, recommendations are formulated for repair and maintenance work in the event of its reduction, when testing machines of one model, you can determine the reference machine for processing quality and dynamic quality, and then plan and implement an action plan to improve the dynamic quality of machines to the standard level within the framework of the process monitoring system (SMTP).

Transferring Biophilic and Universal Design Theory to Practice With Learning From Green Buildings

2022 ◽  
pp. 225-252
Author(s):  
Gülşah Doğan Karaman ◽  
Semra Arslan Selçuk
Keyword(s):  
Case Studies ◽  
Assisted Living ◽  
Design Patterns ◽  
Design Theory ◽  
Universal Design ◽  
Design Method ◽  
Green Building ◽  
Green Buildings ◽  
Biophilic Design ◽  
Theory To Practice

The study aims to guide the assisted living facility (ALF) design, in which biophilic design, which is observed to have positive physiological, psychological, and sociological effects on humans, is observed, and the principle of universal design is accessible and designed for everyone. Since there is no place called a biophilic ALF, the study is supported by a nature-oriented design method called Green Building Rating Tools. Green building certificate systems are explored in terms of biophilic and universal design, and three of the certifications show credits linked to the theories researched. With these certificates, green building certified ALFs located in the same region are selected. With the methodology applied on the case studies of three ALFs that received these certificates, how and where biophilic and universal design patterns can be transferred from theory to practice has been examined. The study observed the extent of 14 biophilic design patterns in ALFs and tabulated how to find each pattern in these facilities according to the methods and places.

scholarly journals Technical Solution of the Drive System for Mixing Dough Machine

2019 ◽  
Vol 290 ◽  
pp. 08013
Author(s):  
Aleksandar Miltenović ◽  
Milan Banić ◽  
Nikola Velimirović
Keyword(s):  
Global Economy ◽  
Food Products ◽  
Drive System ◽  
Design Solution ◽  
Medium Size ◽  
Technical Solution ◽  
Complete Space ◽  
Quality Of Food ◽  
Noise And Vibration Reduction

In the conditions of the global economy, food industry products have a good share in international trade. It is primarily ready-made food products that are ready for use. The basic problem that needs to be solved is the safety and quality of food products. Machine “Planetary mixer” is used for mixing and preparing dough. From the aspect of optimal fulfilment of the working function of the preparing dough “Planetary mixer” has to fulfil the following conditions: - the complete space in which the dough is located must be treated equally with the mixer; - noise and vibration reduction should be ensured and appropriate precision positioning of the machinery’s executive bodies; - a compact construction of the drive system is required with the optimum utilization of the available resources. In the paper is presented technical design solution of the drive system for machine based on the demands of regional medium size enterprise and therefore it is limited to the requirements of the investor. The final solution was achieved by using the modern methods of product development.

Spatial Information System Development

2011 ◽  
pp. 36-62
Author(s):  
Brian N. Hilton ◽  
Richard J. Burkhard ◽  
Tarun Abhichandani
Keyword(s):  
Information System ◽  
System Design ◽  
Design Theory ◽  
Spatial Information ◽  
System Development ◽  
Information System Development ◽  
Information System Design ◽  
Organization And Management ◽  
Nature Of Information

An approach to an ontology-based information system design theory for spatial information system development is presented. This approach addresses the dynamic nature of information system development at the beginning of the 21st century and addresses the question of how to establish relationships between the various design components of a spatial information system. It should also help to automate and guide the design process while at the same time improve the quality of the process along with its outputs. An example of this approach is presented, along with examples of the various ontologies utilized in the design of this particular spatial information system. Finally, a method to mitigate the issues regarding the organization and management of a growing library of ontologies is discussed.

An Improved Undergraduate Human Factors Course: Three Results

1983 ◽  
Vol 27 (6) ◽  
pp. 455-458
Author(s):  
Richard Halstead-Nussloch ◽  
Mark C. Detweiler ◽  
M. Peter Jurkat ◽  
Elissa L.A. Hamilton ◽  
Leon S. Gold
Keyword(s):  
Human Factors ◽  
Experimental Methods ◽  
Design Solution ◽  
Course Enrollment ◽  
Stevens Institute ◽  
Computer Based ◽  
Institute Of Technology

The undergraduate human factors course was improved at the Stevens Institute of Technology. The objectives of the course improvement were twofold: 1) to increase the quality of the course, and 2) to increase enrollment. Computer-based modules were developed and implemented to achieve these objectives. Three primary findings emerged from their use. First, students finished the course with a firm grounding in the empirical and experimental methods of human factors. Second, students generated more design solution alternatives by using the modules. Third, course enrollment increased by seventy-five percent.

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