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VANOS Journal of Mechanical Engineering Education

VANOS
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Published by Universitas Sultan Ageng Tirtayasa

ISSN : - EISSN : - DOI : -

Core Subject : Education,

Education

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Articles 9 Documents

Search results for , issue "Vol 2, No 2 (2017)" : 9 Documents clear

ALUMINUM ALLOYS BY ECAP CONSOLIDATION FOR INDUSTRIAL APPLICATION Agus Pramono; Anistasia Milandia; Kurnia Nugraha; Moch Fawaid
VANOS Journal of Mechanical Engineering Education Vol 2, No 2 (2017)
Publisher : Universitas Sultan Ageng Tirtayasa

Affecting factor of importance in industrial applications of Powder Metallurgy is a process of consolidation, the fabrication process with the good parameters by increasing of the bond strength on the surface to reduce the number of pores. In particular, methods of Severe Plastic Deformation (SPD) overcoming a number of difficulties associated with residual porosity in the sample which solidified. Ultrafine–Grained (UFG) materials processed by ECAP usually show unique mechanical properties such as; high yield stress at low strain hardening, good ductility on low temperatures and high strain-rate super-plasticity at high temperatures. Production of Al alloy growing rapidly, particularly in the automotive industry. Although high-strength aluminium alloys containing Mg and Si (6xxx series aluminium alloys) which are easily reached, for formability processes is not sufficient to be applied. Therefore, much research has focused on increasing the formability of these alloys through heat treatment. High strength aluminium alloy, such as alloy AA7XXX, which combines the power of high-density ratio with excellent mechanical properties, is widely used for aviation applications, superplastic forming into the high-volume fabrication of components in the automotive. Consumer products industry is currently limited because of the relatively low strain rate. AA6XXX are some of the alloys materials, mostly used currently covering the whole range of industry. Applications of AA6XXX easier to process than AA7XXX because of properties the material elasticity, AA7XXX tend to form internal cracks as a result of microsegregation. That way heat treatment is required to improve the properties of the material when it is processed by ECAP.

NUMERICAL STUDY OF DIFFUSER EFFECT ON BLUFF BODY : AERODYNAMIC CHARACTERISTICS M. Yasep Setiawan; Martias Martias; Erzeddin Alwi
VANOS Journal of Mechanical Engineering Education Vol 2, No 2 (2017)
Publisher : Universitas Sultan Ageng Tirtayasa

This study focuses on the numerical study of flow structure analysis around bluff bodies close to the downstream face of the free-channel surface. This was investigated using coefficient pressure, coefficient drag, lift coefficient and skin friction coefficient on high Reynolds number (ReH = 2.19 × 106). The general procedure for this research is formulated in detail for allocations in dynamic analysis of fluid computing. The numerical model used is the 2D RANS model (Steady Reynolds Averaged Navier Stokes) with the standard k-ɛ model by giving a flow rate of 40 m / s. This bluff body model will be given the addition of diffuser treatment on the back where the result will be compared to the model without the addition of diffuser and the addition of round shape on the top front on both models. From the research it was found that the coefficient drag bluff body with the addition of diffuser is bigger than the bluff body without the diffuser, it can be concluded that the diffuser angle used is too big causing the coefficient drag to become bigger.

CHARACTERISTICS AND CONSUMPTION OF FUEL OIL SOLAR OIL WITH HAZELNUT OIL IN DIESEL MOTOR Muhammad Nurtanto; Sulaeman Deni Ramdani; Soffan Nurhaji
VANOS Journal of Mechanical Engineering Education Vol 2, No 2 (2017)
Publisher : Universitas Sultan Ageng Tirtayasa

This study aims to determine the characteristics of fuel (diesel oil, walnut oil and sesame oil), the characteristics of the fuel mixture and knowing the amount of fuel consumption with a variation of the engine rotation. Measurements were made using 898 analyzer stages. Data were analyzed descriptively by describing the graphics and measurable phenomenon. The test results found that: (1) the characteristics of hazelnut oil, sesame oil meets the characteristics of the fuel; (2) a mixture of diesel fuel to 80% with 10% of hazelnut oil and sesame oil 10% yield better characteristics; and (3) the fuel consumption of the engine rev 1600 rpm, 2000 rpm and 2300 rpm is more stable on a mixture of diesel fuel to 80% with hazelnut oil 10% and sesame oil 10% each SFC obtained as follows 0.279882, 0.288938 and 0.281213.

NUMERICAL COOLING SIMULATION ON LAPTOP HEAT SINKS WITH VARIATIONS OF DIFFERENT AIRFLOW SPEEDS Syamsuri Syamsuri; Novi Indah Riani
VANOS Journal of Mechanical Engineering Education Vol 2, No 2 (2017)
Publisher : Universitas Sultan Ageng Tirtayasa

Cooling on electronic objects, especially laptop is something to note. If the cooling system is not good, there will be overheating on the main chip motherboard and other components so that the laptop will be damaged quickly. This research aims to determine the temperature distribution on the heat sink laptop so that overheat can be overcome. This research was carried out numerically, where the specimen was a heat sink component on a laptop unit simulated using Solid works 2011 software in three dimensions with variations carried out in the form of air velocity values passing through the specimens of 5, 10, and 15 m/s. The results obtained in this study showed that the higher the speed of air flow through the heat sink, the higher the transfer of heat transfer.

ANALYSIS ON THE ROLE OF ENGINE COOLANT TEMPERATURE SENSOR IN GASOLINE ENGINE Toto Sugiarto; Dwi Sudarno Putra; Wawan Purwanto
VANOS Journal of Mechanical Engineering Education Vol 2, No 2 (2017)
Publisher : Universitas Sultan Ageng Tirtayasa

A gasoline motor engine using electronic control system has several sensors and actuators driven by a computer. This paper aims to reveal the role of an engine temperature sensor mounted on a gasoline engine motor. The testing data shows that there is a connectivity between the temperature data obtained from the coolant temperature sensor with the fuel injection time and the exhaust gas emission content.

QUALITY DETERMINING OF MACHINING PRODUCTS BASED ON MANUFACTURING INDUSTRY STANDARDS: AN EXPLORATION SURVEY OF VOCATIONAL STUDENTS Bayu Rahmat Setiadi; Setuju Setuju; Suparmin Suparmin
VANOS Journal of Mechanical Engineering Education Vol 2, No 2 (2017)
Publisher : Universitas Sultan Ageng Tirtayasa

The quality of a machining product depends on many factors. The manufacturing industry has standardized processes that need to be disseminated to vocational students in order to achieve alignment in the achievement of competence needs relevant to the needs of the industrial world. This study aims to reveal the influential determinant variable in machining process in manufacturing industry and develop conceptual model that can be used as a theory in producing quality products. The research method used survey with exploratory sequential with approach used mix method. The sample of this research is 122 students of National Vocational School Berbah program of machining engineering. Data collection used is questionnaires and interviews. The results showed that there are variables of creativity, completeness of machine accessories, the use of measuring tools, and concerns of occupational health and safety as a critical determinant of the success of a qualified machining process. The Lisrel analysis shows that there are both direct and indirect effects of these variables on the quality of machining products of industry-standard manufacturing.

TEACHING FACTORY ON IMPROVING STUDENT COMPETENCY IN BANTEN Zaenal Ambia; Sulaeman Deni Ramdani
VANOS Journal of Mechanical Engineering Education Vol 2, No 2 (2017)
Publisher : Universitas Sultan Ageng Tirtayasa

SMK has an important role in the preparation of labor. SMK is required to always be able to follow the needs of the work world that continues to grow in accordance with the vision and mission objectives of SMK. This study aims to 1) to know the readiness of teaching factory implementation, 2) to identify problems of teaching factori application. This research uses quantitative descriptive. Source of data obtained from SMKN 2 Pandeglang, SMP Ypp Pandeglang, SMKN 7 Pandeglang, SMKN Agriculture Serang City, SMKN 1 Cikande, SMKN 1 Cilegon And Smkn 4 Serang City, the number of respondents amounted to 30 respondents. Data collection techniques using a questionnaire of 30 items. Technique of data analysis using quantitative descriptive statistic. Implementation of Teaching Factory Result to Student Competence Improvement, showed that 1) acquisition from aspect of readiness of human resource in aiming very good result / high with percentage 81%. Aspects of infrastructure facilities show excellent results / high percentage 79%, Aspects of cooperation readiness DU / DI percentage of 68% showed good results / high 2) Problems of teaching factory implementation can be explained. a) lack of restrictions on cooperation in schools with DU / DI b) still lack of tools and sarapa prakti from DU / DI. c) forms of cooperation undertaken not in accordance with school expectations.

GRAIN REFINEMENT TECHNIQUES TO REDUCE BIODEGRADATION RATE OF MAGNESIUM ALLOY AS A POTENTIAL BIODEGRADABLE IMPLANT MATERIAL: A REVIEW Nanang Qosim; Silmina Adzhani
VANOS Journal of Mechanical Engineering Education Vol 2, No 2 (2017)
Publisher : Universitas Sultan Ageng Tirtayasa

As a lightweight metal with mechanical properties similar to natural bone, magnesium-based material has been gaining wide popularity. However, the applications are seriously limited due to the excessively rapid degradation rate in the physiological environment, causing the magnesium to degrade faster than the complete rehabilitation of the bone itself. Grain refinement approach is currently the selected approach to obtain a lower degradation rate without adding other element that might be harmful to human body. This paper studies the possibility of reducing biodegradation rate of a biodegradable through reviewing various studies on grain refinement through hot deformation and rapid solidification.

DEVELOPMENT OF CLASS-BASED COGNITIVE ASSESSMENT INSTRUMENT ACCORDING TO CURRICULUM 2013 ON TECHNICAL DRAWING SUBJECTS IN VOCATIONAL SCHOOL Ita Novita Sari; Sulaeman Deni Ramdani
VANOS Journal of Mechanical Engineering Education Vol 2, No 2 (2017)
Publisher : Universitas Sultan Ageng Tirtayasa

The 2013 curriculum uses a classroom-based assessment. The curriculum contains various supporters, one of which is an assessment. Assessment by teachers is used to measure the achievement of learning objectives. But in the real world, a teacher has difficulty in developing assessment planning, assessment implementation, and processing of assessment result, and teacher has not analyzed comprehensively about validity and reliability in question, and analysis of evaluation instrument conducted by the teacher is only limited to analyze difficulty level. Thus, the problem that is made to know the cognitive level of students has not known the quality. The objectives of this study were (1) to know the reliability of cognitive assessment instruments developed, (2) to know the level of difficulty, (3) to know the differentiating power, and (4) to know the effectiveness of the cultivators. The method used in this research is research and development (R & D) developed by Borg & Gall. Data analysis technique that is done is instrument validation test with construct validity through judgment expert, reliability test using ITEMAN with formula CR-20. This study resulted in (1) the reliability of the question items of 0.740, (2) the degree of difficulty there are three levels, namely difficult 23%, medium 70%, and easy 7%, (3) distinguishing power on the grain matter analysis resulted in 20%, 7% of the questions are sufficient, 60% is good, and 13% are very good, and (4) the effectiveness of the deception is 82% working and 18% not working.

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