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ANALISA DAMPAK LAJU KOROSI TERHADAP KEKUATAN OVEN WIRE BELT (BAJA KARBON AISI 1065) Amri Abdulah; Agus Solehudin; Hilman Nugraha
Jurnal Teknologika Vol 9 No 2 (2019): Jurnal Teknologika
Publisher : Sekolah Tinggi Teknologi Wastukancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (721.358 KB)

Korosi merupakan reaksi elektrokimia antara logam dan lingkungan yang menyebabkan karat dan menurunkan mutu logam, tujuan dari penelitian ini untuk menganalisa terjadinya korosi pada sabuk konveyor berupa jala kawat (oven wire belt) yang terbuat dari baja karbon AISI 1065 di mesin pemanggang (tunnel baking oven) untuk pemanggangan adonan biskuit.Penelitian dilakukan setelah proses pemanggangan adonan biskuit di tunnel baking oven selama pengopersian 1174 hari, dengan metode pengujian kehilangan berat sampel uji, pengukuran diameteroven wire belt,tegangan operasi, perhitungan kekuatan tarik, tegangan geser dan regangan. Hasil dari pengujian kehilangan berat sampel uji rata-rata laju korosi adalah sebesar 0,0366 mpy dan pengecilan rata-rata diameter sebesar 0,349 mpy,Laju korosi berdampak pada tegangan operasi, sebelum terjadi korosi sebesar 3,20 x 107 N/m2 dan setelah korosi menjadi 3,33 x 107 N/m2 dengan penurunan kekuatan tarik dari hasil pengujian kehilangan berat adalah sebesar 160,905 N/m2. Tegangan geser mengalami penurunan sebesar1,04 x 106 N/m2. terjadinya pengecilan penampang mengakibatkanpeningkatan regangan dari pitch awal 8,5 mm menjadi 9,45 mm dan persentase elongasi naik dari8%menjadi 9,96 %.

FACTOR ANALYSIS OF STUDENT PRACTICUM IMPLEMENTATION ON LATHE WORK Masnah, Siti Laily; stefhen, Gilbert; Solehudin, Agus; Putri, Amalia Aisyah
Journal of Mechanical Engineering Education (Jurnal Pendidikan Teknik Mesin) Vol 8, No 1 (2021): Juni
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/jmee.v8i1.36576

Practical-based learning can improve students' thinking skills and abilities. Optimizing the implementation of the practicum needs to be supported by various factors so that student learning outcomes are good. This study aims to obtain the dominant factors that support the implementation of student practicum on lathe work. This study uses descriptive quantitative methods with data collection techniques using a questionnaire instrument. The research population is students from the Mechanical Engineering Education Study Program at a university in Bandung. The results of the study indicate that there is a relationship between a number of independent variables. The six independent variables identified as sources of practicum support were then grouped into two new factors. The two factors have a correlation greater than 0,5, so it can be concluded that it is feasible to summarize the six variables analyzed. Based on the total variance score explained, factor 1 is the dominant factor affecting the implementation of the lathe work practicum and according to the rotated component matrix it is known that from factor 1, the workshop building variable has the highest correlation and the tools and practicum materials have the second highest correlation. This shows that the variables of the workshop building and the variables of tools and practicum materials are very important to be used as references in supporting good learning outcomes in practical activities.

ANALISIS PERAWATAN MESIN DRINKING WATER DENGAN METODE RELIABILITY CENTERED MAINTENANCE (RCM) Fadhal; Solehudin, Agus; Mulyadi, Cecep Deni; Fhaizal, Mohamad Agus
TECHNO-SOCIO EKONOMIKA Vol 17 No 2 (2024): Jurnal Techno-Socio Ekonomika - Oktober
Publisher : LPPM Universitas Sangga Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32897/techno.2024.17.2.3746

The company where author currently work is at PT Angkasa Pura Solusi a subsidiary of PT Angkasa Pura II (Persero) Soekarno-Hatta International Airport, the author in Water Treatment unit as a senior technician. This unit is responsible for operating, maintaining, and repairing clean water distribution equipment to terminals and buildings at Soekarno-Hatta Airport as well as overcoming disturbances, repairing, replacing, and maintain the equipment at Soekarno-Hatta International Airport in accordance with applicable regulations. One of the responsibilities is the maintenance of Drinking Water Machine equipment, for current conditions maintenance of Drinking Water Machine equipment is only carried out if there are complaints of problems by telephone. For scheduled or planned maintenance has been carried out but is still not effective. The result is that the tool experiences a short lifetime on the supporting components of the Drinking Water Machine tool which makes the tool unable to operate properly and leads to budget overruns because they have to continue to replace damaged spare parts components so that the tool can operate optimally at performance figures above 90%, in addition to the impact caused by equipment operational downtime due to lack of preparation when the Drinking Water Machine tool must be repaired. For this reason, the author makes a maintenance analysis of the Drinking Water Machine with the Reliability Centered Maintenance (RCM) method, from this method it will be known what components of the Drinking Water Machine are often damaged or malfunctioned.

Heat Transfer Fluid Deposit in Retainer of Mechanical Seal Heryadi, Yadi; abdulah, Amri; Djafar Shieddieque, Apang; Ardi Rajab, Dede; Suripto, Heri; Setiawan, Dibyo; Solehudin, Agus
Jurnal Teknologika Vol 15 No 1 (2025): Jurnal Teknologika
Publisher : Sekolah Tinggi Teknologi Wastukancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51132/teknologika.v15i1.450

Mechanical seals in industrial pumps play a critical role in preventing heat transfer fluid leakage, especially under high-temperature operating conditions. A key component of this system is the seal head, which functions as a compression mechanism through a spring to maintain contact between sealing surfaces. However, the spring's performance can deteriorate due to the accumulation of deposits resulting from prolonged exposure to elevated temperatures, operating pressure, and fluid degradation—ultimately leading to seal failure and fluid leakage. This study aims to investigate the thermal stability of the reservoir fluid Therminol 66 (TM-66) and its impact on seal performance under long-term thermal exposure. The methodology includes direct observation of failed seals, thermogravimetric analysis (TGA) at temperatures of 75, 150, 250, and 350 °C for durations of 3, 6, and 12 hours, and chemical characterization using Fourier Transform Infrared Spectroscopy (FTIR). Additionally, thermal degradation behavior was assessed through activation energy estimation based on weight loss data obtained from TGA. FTIR results revealed that phenylcyclohexane is the dominant compound in TM-66, with a relative intensity of 0.803119. The thermogravimetric data demonstrated that higher temperatures and longer exposure times significantly accelerated fluid evaporation and mass loss. The activation energy analysis confirmed that thermal degradation is more likely to occur under extended high-temperature conditions. These findings highlight the importance of maintaining reservoir fluid temperature below 75°C to minimize deposit buildup in the seal chamber and ensure the long-term reliability and efficiency of the mechanical seal system.

Improving Classroom Management Skills Through Micro Teaching for Pre-Service Teachers of Vocational Schools Padilah, Dede; Berman, Ega Taqwali; Solehudin, Agus
Edunesia : Jurnal Ilmiah Pendidikan Vol. 6 No. 2 (2025)
Publisher : research, training and philanthropy institution Natural Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51276/edu.v6i2.1218

Classroom management is vital for fostering productive learning environments. As a leading teacher-training institution, Universitas Pendidikan Indonesia (UPI) employs microteaching to equip students with pedagogical skills. This qualitative case study examines how microteaching enhances classroom management competencies among six Mechanical Engineering Education students, preparing them for the Program Penguatan Profesional Kependidikan (P3K). Data were collected through interviews on microteaching implementation, classroom management practices, and observations of teaching sessions. Supporting documentation and triangulation ensured validity. Analysis followed stages of reduction, presentation, and conclusion. Findings indicate that structured microteaching significantly improves classroom management abilities, evident in students' enhanced performance during school-based teaching. The program's procedural adherence enables participants to refine lesson delivery, behavioural management, and instructional adaptability. Practical experience through microteaching not only bridges theoretical knowledge with real-world application but also builds confidence and readiness for first aid challenges. Thus, microteaching is a critical preparatory tool, equipping future educators with the skills to navigate dynamic classroom settings and meet professional demands. These outcomes underscore the value of experiential training in teacher education, positioning UPI's approach as a model for cultivating adaptable, classroom-ready educators.

From School to Industry : The Relevance of Vocational School Competencies in Machining Technology to Manufacturing Industry Needs Zhahara, Zhahrotul; Solehudin, Agus; Berman, Ega Taqwali
Jurnal Paedagogy Vol 12, No 3 (2025): July : IN PROGRESS
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/jp.v12i3.15353

This study aims to analyze the relevance of technical machining skills competencies at SMK Negeri 1 Karawang to labor needs in the manufacturing industry sector. The research method used is a survey with a quantitative approach. The research instrument is a questionnaire given to 68 students in the 12th grade of the technical machining program. The data analysis technique used was descriptive statistical analysis, calculating the percentage of respondents' answers based on the Likert scale to evaluate the alignment of the curriculum and graduates' competencies with industry demands. The research results indicate that the competencies possessed by graduates of SMK Negeri 1 Karawang are highly relevant and aligned with the demands of the job market. This is evident from the curriculum content alignment rate, which reached 85%. Specifically, graduates' competencies in cognitive aspects achieved a percentage of 86%, while psychomotor aspects also scored 86%. Meanwhile, the affective aspect received the highest score at 88%. However, there are still shortcomings in the mastery of soft skills, such as the 5S principles (commonly understood as Sort, Set in order, Shine, Standardize, and Sustain, though adapted here for workplace politeness and courtesy as Smile, Greeting, Politeness, and other relevant workplace behaviors might be more contextually defined) and 5P (Precision, Productivity, Maintenance, Prevention, and Improvement), as well as workplace safety culture (Safety) and work ethics. These findings recommend strengthening soft skills in the curriculum, enhancing collaboration between schools and industry, and conducting regular curriculum evaluations to ensure that graduates' competencies remain aligned with the needs of the job market.

STEM Interest, engineering-oriented career identity, and academic self-efficacy on engineering study intention: A SEM analysis among senior high school students Saputra, Wasimudin Surya; Hamdani, Aam; Solehudin, Agus; Sucita, Tasma
Journal of Environment and Sustainability Education Vol. 3 No. 2 (2025)
Publisher : Education and Development Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62672/joease.v3i2.102

Recognizing the critical contribution of the engineering field to national human resource development and innovation, coupled with the existing challenge of low student interest in engineering careers among Indonesian high school students, this study aims to analyze the influence of STEM Interest and Academic Self-Efficacy (ASE) on Engineering Study Intention (ESI) through the mediating role of Engineering-Oriented Career Identity (EOCI). Using a quantitative survey approach, data were collected from 695 students participating in the university entrance selection process. Instruments were adapted from prior validated studies and measured on a 1–6 Likert scale. Data were analyzed using Partial Least Squares Structural Equation Modeling (PLS-SEM) via SmartPLS 3. Based on the processed data, the findings reveal that both STEM Interest and ASE significantly foster the development of EOCI among students (β = 0.420 and β = 0.425, p < 0.001). In turn, EOCI strongly predicts ESI (β = 0.654; p < 0.001). However, the direct effects of STEM Interest and ASE on ESI were non-significant, confirming that EOCI fully mediates the relationship. This indicates that students' motivation and confidence affect their intention to pursue engineering primarily through identity development. The model explains 45.1% of the variance in EOCI and 43.6% in ESI, with satisfactory convergent and discriminant validity and good model fit (SRMR = 0.039, NFI = 0.948). These findings affirm the importance of forming an engineering career identity in supporting students' transition to engineering education. Practical implications include strengthening motivational programs and engineering career exploration from secondary education.

STEM Interest, engineering-oriented career identity, and academic self-efficacy on engineering study intention: A SEM analysis among senior high school students Saputra, Wasimudin Surya; Hamdani, Aam; Solehudin, Agus; Sucita, Tasma
Journal of Environment and Sustainability Education Vol. 3 No. 2 (2025)
Publisher : Education and Development Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62672/joease.v3i2.102

Recognizing the critical contribution of the engineering field to national human resource development and innovation, coupled with the existing challenge of low student interest in engineering careers among Indonesian high school students, this study aims to analyze the influence of STEM Interest and Academic Self-Efficacy (ASE) on Engineering Study Intention (ESI) through the mediating role of Engineering-Oriented Career Identity (EOCI). Â Using a quantitative survey approach, data were collected from 695 students participating in the university entrance selection process. Instruments were adapted from prior validated studies and measured on a 1â€“6 Likert scale. Data were analyzed using Partial Least Squares Structural Equation Modeling (PLS-SEM) via SmartPLS 3. Based on the processed data, the findings reveal that both STEM Interest and ASE significantly foster the development of EOCI among students (Î² = 0.420 and Î² = 0.425, p < 0.001). In turn, EOCI strongly predicts ESI (Î² = 0.654; p < 0.001). However, the direct effects of STEM Interest and ASE on ESI were non-significant, confirming that EOCI fully mediates the relationship. This indicates that students' motivation and confidence affect their intention to pursue engineering primarily through identity development. The model explains 45.1% of the variance in EOCI and 43.6% in ESI, with satisfactory convergent and discriminant validity and good model fit (SRMR = 0.039, NFI = 0.948). These findings affirm the importance of forming an engineering career identity in supporting students' transition to engineering education. Practical implications include strengthening motivational programs and engineering career exploration from secondary education.

From School to Industry : The Relevance of Vocational School Competencies in Machining Technology to Manufacturing Industry Needs Zhahara, Zhahrotul; Solehudin, Agus; Berman, Ega Taqwali
Jurnal Paedagogy Vol. 12 No. 3 (2025): July
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/jp.v12i3.15353

This study aims to analyze the relevance of technical machining skills competencies at SMK Negeri 1 Karawang to labor needs in the manufacturing industry sector. The research method used is a survey with a quantitative approach. The research instrument is a questionnaire given to 68 students in the 12th grade of the technical machining program. The data analysis technique used was descriptive statistical analysis, calculating the percentage of respondents' answers based on the Likert scale to evaluate the alignment of the curriculum and graduates' competencies with industry demands. The research results indicate that the competencies possessed by graduates of SMK Negeri 1 Karawang are highly relevant and aligned with the demands of the job market. This is evident from the curriculum content alignment rate, which reached 85%. Specifically, graduates' competencies in cognitive aspects achieved a percentage of 86%, while psychomotor aspects also scored 86%. Meanwhile, the affective aspect received the highest score at 88%. However, there are still shortcomings in the mastery of soft skills, such as the 5S principles (commonly understood as Sort, Set in order, Shine, Standardize, and Sustain, though adapted here for workplace politeness and courtesy as Smile, Greeting, Politeness, and other relevant workplace behaviors might be more contextually defined) and 5P (Precision, Productivity, Maintenance, Prevention, and Improvement), as well as workplace safety culture (Safety) and work ethics. These findings recommend strengthening soft skills in the curriculum, enhancing collaboration between schools and industry, and conducting regular curriculum evaluations to ensure that graduates' competencies remain aligned with the needs of the job market.

TEKNOLOGI ENERGI SURYA SEBAGAI SUMBER ENERGI ALTERNATIF DALAM PROSES ELEKTROPLATING Warsono, Warsono; Maulana, Irfan; Rawati, Widya Yeni; Sunardi, Sunardi; Solehudin, Agus
JURNAL SIMETRIK Vol 15 No 2 (2025): Desember
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M) Politeknik Negeri Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/js.v15i2.3494

The rapid development of technology today demands the utilization of renewable energy sources, one of which is solar energy. As a sustainable energy source, sunlight has great potential due to its abundant and unlimited availability. Therefore, solar energy can be utilized in Solar Power Generation Systems (PLTS) to meet the electrical needs of various applications. This study discusses the design of a PLTS system as a potential energy source for an electroplating device. The system employs a 100 Wp solar panel and a 12 V 20 Ah battery as an energy storage medium. Based on the test results, the minimum power output was 51 W at an irradiation level of 650 W/m², while the maximum power output reached 107 W at an irradiation level of 804 W/m². Additionally, the heating element in the electroplating system produced a maximum temperature of 63.7 °C. These results indicate that the designed PLTS system is capable of effectively supplying the required energy for the electroplating process. Keywords: Renewable energy, electroplating, solar power

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