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Walid, Achmad
Polytechnic State Of Malang
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PENGARUH RASIO GAS LPG DAN UDARA TERHADAP PERUBAHAN TEMPERATUR DAN TEKANAN PADA PEMBAKARAN DI MIKROKOMBUSTOR Walid, Achmad
JURNAL FLYWHEEL Vol 4 No 2 (2011): Jurnal Flywheel
Publisher : Teknik Mesin S1 ITN Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/flywheel.v4i2.572

Abstract

Microcombustion menjadi penting dalam bidang riset akibat pertumbuhan pada sistem mikro dan microelectromechanical system (MEMS). Sistem mikro banyak ditemukan dalam elektronika portabel, sensor mikro, dan lainnya yang membatasi komponen baik pada ukuran maupun performansinya. Perkembangan teknologi di bidang penerbangan, biotechnology, industry kimia, teknologi informasi menjadikan miniaturisasi produk semakin disukai karena memberikan suatu kontrol yang lebih baik, pengukuran yang lebih presisi dan lebih flexible dari pada perangkat konvensional. Pembakaran, bagian penting untuk mengkonversikan energi kimia ke bentuk energi thermal dari berbagai jenis bahan bakar seperti hydrogen, gas alam, premium dan bahan bakar alcohol lainnya. Pada penelitian ini dibahas mengenai pembakaran gas LPG pada suatu mikrokombustor. Pembakaran mengikuti konsep dan metode pembakaran premix. Bahan bakar yang digunakan adalah jenis hidro karbon, karena densitas energi bahan bakar hidro karbon 20 – 50 kali lebih tinggi dari baterai li-ion. Eksperimen menunjukkan bahwa pembakaran pada mikrokombustor dengan bahan bakar gas LPG melalui periode pemanasan, periode perubahan fase, dan penyalaan . Pada proses penyalaan pada pembakaran gas LPG di mikrokombustor diperoleh tekanan maksimum (Pmax) sebesar 3745 Pa pada AFR 23. Pada proses penyalaan pembakaran gas LPG di mikrokombustor diperoleh lama terbakar rata-rata 0,35 detik.
Aplikasi solidwork untuk rancangan CAD 3D pada mesin 3D printer 2x2x2 meter Budhy Setiawan; Isa Triyanti Santoso; Achmad Walid; Ryan Prasetyo; Delila Cahya Permatasari; Virna umro Audiana
JURNAL ELTEK Vol 19 No 2 (2021): ELTEK Vol 19 No 2
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (375.515 KB) | DOI: 10.33795/eltek.v19i2.283

Abstract

ABSTRAK Mesin 3D printing dapat membuat proses produksi menjadi singkat dan sederhana, keunggulan ini menjadikan banyak peneliti mulai menggembangkan mesin printing. Pengembangan mesin printing yang sudah dilakukan salah satunya adalah mesin 3D printer 2 x 2 x 2 meter. Keberhasilan mesin printing dapat dilihat dari hasil printing yang sesuai dengan desain yang diharapkan. Oleh karena itu, diperlukan aplikasi yang dapat membantu merancang desain objek 3D pada mesin printer 2x2x2 meter, salah satunya menggunakan aplikasi CAD (Computer Aided Design) “SolidWork”. Aplikasi “SolidWork” bersifat opensource yang dapat membantu mengetahui pengaruh desain 3 dimensi menggunakan software CAD terhadap jarak, sudut dan skala objek pada mesin printer 2x2x2 meter. Desain objek 3D “SolidWork” disimpan dalam dalam format file STL, kemudian diproses di dalam Simplify 3D, objek akan diiris secara software. Hasil irisan gambar 3D akan menghasilkan sebuah file G-Code. Output koordinat dari G-Code digunakan untuk menggerakan motor stepper. Hasil cetak objek 2D memiliki error ukuran bentuk segitiga 4,62%, bentuk straight slog 7,49%, bentuk oval 5,54%, error sudut sebesar 0% dan error skala objek 0%. Sedangkan untuk objek 3D memiliki error rata – rata sebesar 0,29%. Berdasarkan hasil pengujian aplikasi “SolidWork” dapat menujukkan kinerja mesin dan membantu dalam pembuatan desain 2D dan 3D pada mesin 3D printer 2x2x2 meter di Lab Elektro Prodi Elektronika Politeknik Negeri Malang. ABSTRACT 3D printing machines can make the production process short and simple, this advantage has made many researchers start to develop printing machines. One of the developments in printing machines that have been carried out is the 2 x 2 x 2 meter 3D Printer machine. The success of the printing machine can be seen from the printing results by the expected design. Therefore, an application is needed that can help design 3D object designs on a 2x2x2 meter printer machine, one of which is using the CAD (Computer-Aided Design) application "SolidWork". The application "SolidWork" is open source which can help determine the effect of 3-dimensional design using CAD software on the distance, angle, and scale of objects on a 2x2x2 meter printer machine. "SolidWorks" 3D object design is saved in STL file format, then processed in Simplify 3D, the object will be sliced ​​automatically. The sliced ​​3D image will produce a G-Code file. The coordinate output from the G-Code is used to drive the stepper motor. The printout of 2D objects has a triangular size error of 4.62%, a straight slog shape of 7.49%, an oval shape of 5.54%, an angle error of 0%, and a scale error of 0%. Meanwhile, 3D objects have an average error of 0.29%. Based on the results of testing the "SolidWork" application can show machine performance and assist in making 2D and 3D designs on a 2x2x2 meter 3D printer machine at the Electrical Lab of Electronics Study Program, State Polytechnic of Malang.
PEMBUATAN LAMPU PERINGATAN JALAN BERTENAGA SURYA DI DESA SUMBERINGIN KIDUL, NGUNUT, TULUNGAGUNG Kris Witono; Asrori Asrori; Satworo Adiwidodo; Achmad Walid; Eko Yudiyanto; Agus Sujatmiko
Jurnal Abdimas UNU Blitar Vol 5 No 1 (2023): Volume 5 Nomor 1, Juli 2023
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28926/jppnu.v5i1.203

Abstract

Persimpangan jalan utama di RT/RW 03/03 Desa Sumberingin Kidul Kecamatan Ngunut Kabupaten Tulungagung sering terjadi kecelakaan, akibat banyak kendaraan yang melewati jalan tersebut tidak mengurangi laju kendaraannya dan mendapatkan kejutan adanya kendaraan tiba tiba keluar dari perempatan atau warga yang menyeberang, serta tidak begitu tampak dari jalur utama. Kondisi ini tentunya membahayakan bagi pengendara maupun warga yang melewati perempatan tersebut. Untuk mengatasi kondisi tersebut, dibutuhkan lampu peringatan jalan bertenaga surya yang handal dan berbasis energi mandiri. Proses kegiatan berlangsung mulai dari survey di tempat, analisa permaslahan dan solusi yang harus diselesaikan. Perencanaan kegiatan disusun untuk menentukan kebutuhan bahan dan peralatan, pendampingan pembuatan unit lampu peringatan jalan dilakukan dengan pemberdayaan masyarakat sampai dengan pemasangannya. Peran serta masyarakat dilibatkan untuk peningkatan pengetahuan dan ketrampilan warga di bidang fabrikasi dan instalasi lampu bertenaga surya. Hasil kegiatan ini terpasang lampu peringatan jalan bertenaga surya dengan sepsifikasi Panel Surya monokristal 100 Wp, Solar Charger Controller MPPT 10 A, Baterai (accu) 12V 65 Ah, Lampu Peringatan Jalan LED 40 W, kabel dan perlengkapan lainnya. Adanya lampu peringatan jalan ini berdampak pada peningkatan keselamatan aktivitas warga di lingkungan RT/RW 03/03 Sumberingin Kidul Kecamatan Ngunut Kabupaten Tulungagung.
Performansi Alat Uji Getaran Kendaraan Model Satu Roda Terhadap Pengaruh Gelombang Jalan Pipit Wahyu Nugroho; Utsman Syah Amrullah; Khambali; Achmad Walid
Jurnal Teknik Ilmu dan Aplikasi Vol. 5 No. 1 (2024): Jurnal Teknik Ilmu dan Aplikasi
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtia.v5i1.4444

Abstract

Kenyamanan penumpang kendaraan beserta kestabilan dalam mengendarainya adalah salah satu variabel penting yang selalu diinginkan oleh setiap orang yang menggunakan alat transportasi. Guna mencapai tujuan tersebut, maka bagian suspensi kendaraan akan memegang peranan penting karena fungsinya yang mengisolasi penumpang dari pengaruh eksitasi dari luar kendaraan dan mengatur kestabilan kendaraan agar roda tetap menempel di permukaan jalan. Performansi setiap suspensi sangat perlu untuk diuji sehingga bisa dianalisis kondisinya serta jika dimungkinkan untuk dikembangkan suatu suspensi yang lebih baik unjuk kerjanya. Dalam penelitian ini dirancang model alat uji getaran kendaraan satu roda yang dipakai untuk menguji kenyamanan dan kestabilan kendaraan. Perancangan diawali dari komponen transmisi penggerak dari motor ke komponen profil jalan, dalam hal dimensi, bentuk dan material penyusunnya. Komponen permukaan jalan ini berupa motor, camshaft, connecting rod, plat permukaan jalan, poros pendukung dan roda. Setiap komponen itu dirakit menjadi satu kesatuan sistem alat uji dan akan disimulasikan pergerakannya. Perancangan ini berbasis pada Computer Aided Design dengan perangkat lunak Catia. Pengujian model kendaraan dilakukan secara simulasi dengan gaya eksitasi berupa gelombang sinusoidal dan fungsi step dengan variasi jenis suspensi, baik yang soft, medium dan hard. Hasil pengujian menunjukkan respon yang bagus. Suspensi jenis Soft dan Medium bisa menangani getaran dengan sangat baik terutama dari tingkat kecepatan responnya untuk jalan yang relatif rata. Sementara itu Suspensi jenis Hard sangat baik meredam getaran untuk jalan yang bergelombang.
Aplikasi solidwork untuk rancangan CAD 3D pada mesin 3D printer 2x2x2 meter Setiawan, Budhy; Triyanti, Isa; Walid, Achmad; Prasetyo, Ryan; Umro, Virna; Cahya, Delila
JURNAL ELTEK Vol. 19 No. 2 (2021): Oktober 2021
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/eltek.v19i2.283

Abstract

Mesin 3D printing dapat membuat proses produksi menjadi singkat dan sederhana, keunggulan ini menjadikan banyak peneliti mulai menggembangkan mesin printing. Pengembangan mesin printing yang sudah dilakukan salah satunya adalah mesin 3D printer 2 x 2 x 2 meter. Keberhasilan mesin printing dapat dilihat dari hasil printing yang sesuai dengan desain yang diharapkan. Oleh karena itu, diperlukan aplikasi yang dapat membantu merancang desain objek 3D pada mesin printer 2x2x2 meter, salah satunya menggunakan aplikasi CAD (Computer Aided Design) “SolidWork”. Aplikasi “SolidWork” bersifat opensource yang dapat membantu mengetahui pengaruh desain 3 dimensi menggunakan software CAD terhadap jarak, sudut dan skala objek pada mesin printer 2x2x2 meter. Desain objek 3D “SolidWork” disimpan dalam dalam format file STL, kemudian diproses di dalam Simplify 3D, objek akan diiris secara software. Hasil irisan gambar 3D akan menghasilkan sebuah file G-Code. Output koordinat dari G-Code digunakan untuk menggerakan motor stepper. Hasil cetak objek 2D memiliki error ukuran bentuk segitiga 4,62%, bentuk straight slog 7,49%, bentuk oval 5,54%, error sudut sebesar 0% dan error skala objek 0%. Sedangkan untuk objek 3D memiliki error rata – rata sebesar 0,29%. Berdasarkan hasil pengujian aplikasi “SolidWork” dapat menujukkan kinerja mesin dan membantu dalam pembuatan desain 2D dan 3D pada mesin 3D printer 2x2x2 meter di Lab Elektro Prodi Elektronika Politeknik Negeri Malang. ABSTRACT 3D printing machines can make the production process short and simple, this advantage has made many researchers start to develop printing machines. One of the developments in printing machines that have been carried out is the 2 x 2 x 2 meter 3D Printer machine. The success of the printing machine can be seen from the printing results by the expected design. Therefore, an application is needed that can help design 3D object designs on a 2x2x2 meter printer machine, one of which is using the CAD (Computer-Aided Design) application "SolidWork". The application "SolidWork" is open source which can help determine the effect of 3-dimensional design using CAD software on the distance, angle, and scale of objects on a 2x2x2 meter printer machine. "SolidWorks" 3D object design is saved in STL file format, then processed in Simplify 3D, the object will be sliced automatically. The sliced 3D image will produce a G-Code file. The coordinate output from the G-Code is used to drive the stepper motor. The printout of 2D objects has a triangular size error of 4.62%, a straight slog shape of 7.49%, an oval shape of 5.54%, an angle error of 0%, and a scale error of 0%. Meanwhile, 3D objects have an average error of 0.29%. Based on the results of testing the "SolidWork" application can show machine performance and assist in making 2D and 3D designs on a 2x2x2 meter 3D printer machine at the Electrical Lab of Electronics Study Program, State Polytechnic of Malang.
Pelatihan Pengelasan Untuk Siswa sebagai Media Pembelajaran Kewirausahaan di SMK Muhammadiyah 1 Malang Elka Faizal; Sugeng Hadi Susilo; Achmad Walid; Eko Yudiyanto; Gumono
Bulletin of Community Engagement Vol. 4 No. 2 (2024): Bulletin of Community Engagement
Publisher : CV. Creative Tugu Pena

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51278/bce.v4i2.1449

Abstract

In learning in the field of entrepreneurship at SMKM 1 Malang it is written about basic competencies, namely demonstrating scientific behavior. Some of the problems in realizing scientific behavior in entrepreneurship learning are the limited practicum teaching aids in partner schools. For example, for learning welding methods using electric welding. Besides that, students' knowledge about welding is still lacking and there are no welding machines available at SMKM 1 Malang. This needs to be improved by providing more teaching aids with a touch of the latest technology so that it can increase students' learning capacity, especially regarding welding. The community service activities proposed through this scheme will be implemented in several stages including: (1) Carrying out training for students on welding techniques; (2) Providing welding machine facilities for learning welding at vocational schools; (3) Provide assistance in welding learning so that the expected learning outcomes are obtained, namely fostering scientific, creative, innovative behavior and high curiosity; (4) Evaluate the output and outcomes by giving practical assignments and questionnaires to students related to the entrepreneurial learning model using an electric welding machine.  
The Effect of the Number of Injector Holes and Fuel Octane Number on Motorcycle Engine Exhaust Gas Emissions Achmad Walid; Santoso Santoso; Khambali Khambali; Purwoko Purwoko
International Journal of Industrial Innovation and Mechanical Engineering Vol. 2 No. 1 (2025): February: International Journal of Industrial Innovation and Mechanical Enginee
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/ijiime.v2i1.181

Abstract

An increase in the number of vehicles should also be accompanied by improvements in technology that can increase engine efficiency and at the same time reduce air pollution. This research aims to determine the effect of using variations in the number of holes in the injector and the octane number of the fuel on exhaust emissions in motorcycle engines. The research method uses experiments with descriptive analysis. The independent variable is the number of holes in the injector, 4, 6, and 8 and the octane number of 90, and 92. In the exhaust emissions testing process using engine speeds of 1000 rpm, 2000 rpm and 3000 rpm. The bound variable is the emission of carbon monoxide (CO) gas and hydrocarbon gas (HC). Data from CO and HC gas emission testing results at 1000 rpm are all still within the permitted limits. Furthermore, statistical analysis shows that there is an influence of the number of holes in the injector and the octane value of the fuel on CO and HC exhaust emissions and there is no interaction between the octane value variables and the number of injector holes on the CO and HC exhaust gas values. The best results are CO gas emissions = 0.55% and HC = 66 ppm when using a 6 holes injector (standard) and using fuel with an octane value of 92.
Performance Study of the Francis Turbine Runner at Tanggari I Hydroelectric Power Plant via CFD and Reverse Engineer-ing Achmad Walid; Irwanda Yuni Pungkiarto
International Journal of Mechanical, Electrical and Civil Engineering Vol. 2 No. 3 (2025): July: International Journal of Mechanical, Electrical and Civil Engineering.
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/ijmecie.v2i3.312

Abstract

This study aims to analyze the performance and conduct reverse engineering of the Francis Turbine runner at the Tanggari 1 Hydroelectric Power Plant (PLTA Tanggari 1) through 3D scanning and Computational Fluid Dynamics (CFD) simulation. The main objective is to evaluate the turbine's efficiency and identify areas for improvement in the runner geometry. Data from the 3D scan are used to reconstruct a CAD model, which is then numerically tested to predict hydraulic performance. CFD simulations are carried out under various guide vane openings and head variations. The simulation results show a maximum efficiency of 93% at a head of 122.4 meters with a guide vane opening angle of 26° and a flow rate of 8.5 m³/s. The resulting performance curve and hill chart indicate the optimal operating point or Best Efficiency Point (BEP), which serves as a critical reference for turbine operation settings. Flow phenomena such as separation and vortex formation were detected under off-BEP operating conditions, potentially causing pressure fluctuations and vibrations. As a technical recommendation, it is advised to operate the turbine close to the BEP to minimize vibrations and energy losses. Furthermore, the runner geometry obtained from reverse engineering can serve as a basis for component refabrication and the development of new runner designs that are more adaptive to varying load conditions.
UPAYA PENURUNAN POTENSI KERAWANAN LINGKUNGAN MELALUI PEMASANGAN PAGAR PENGAMAN DI DESA NGENEP KEC. KARANGPLOSO KAB. MALANG Nurhadi, Nurhadi; Walid, Achmad; Farida, Nike Nur; Monasari, Ratna; Aji, Supa Kusuma; Winoko, Yuniarto Agus
Jurnal Pepadu Vol 6 No 3 (2025): Jurnal Pepadu
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/pepadu.v6i3.7883

Abstract

RT 04 RW 16, Ngenep Village, Karangploso District, Malang Regency faces environmental vulnerability due to a damaged security fence, allowing outsiders to enter and exit freely, increasing the risk of safety disturbances. This problem is worsened by the fact that the housing estate management was abandoned after the developer was declared bankrupt, forcing residents to manage the environment independently. This situation raises concerns about neighborhood security and urges the need for a concrete, collective solution to mitigate the issue. This community service activity aims to reduce environmental vulnerability by designing and constructing a permanent safety fence in a vacant lot prone to security risks as a preventive measure to enhance neighborhood safety. The methods include analyzing the partner's problems, determining priority issues, designing the fence using AutoCAD, and constructing a 7 x 3.25-meter fence consisting of stone foundations, cast pillars, and lightweight brick walls. The results showed that the safety fence was successfully installed as planned, serving as a physical barrier that limits outsider access, enhances residents' sense of security, and fosters community awareness regarding environmental safety. An evaluation of the project revealed a cost efficiency of 17% compared to the initial Budget Plan (RAB). This activity is expected to serve as a practical solution model for other areas facing similar challenges in community-based environmental security management. Moreover, this project has had a positive impact by increasing community solidarity and encouraging a spirit of mutual cooperation among residents to protect their neighborhood environment.
Analisis Modal dan Modifikasi Struktur Pompa Closed Drain 510-P9002 untuk Mitigasi Getaran di Lapangan Jambaran Tiung Biru Achmad Walid; Irwanda Yuni Pungkiarto; Mohammad Rizanto Juliarsyah; Khoirul Anwar
JURNAL RISET RUMPUN ILMU TEKNIK Vol. 4 No. 3 (2025): Desember : Jurnal Riset Rumpun Ilmu Teknik
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v4i3.6575

Abstract

This study presents a modal analysis of Pertamina EP Cepu’s closed drain pump 510-P9002, which operates in the condensate–water treatment unit of the Jambaran Tiung Biru field. Field vibration measurements conducted in August 2024 indicated a fundamental frequency of 25 Hz, corresponding to 1×RPM of the driving motor, with maximum amplitudes reaching 13.46 mm/s. Such excessive vibration poses risks of mechanical damage, reduced equipment service life, and potential operational failure. To address this issue, finite element analysis (FEA) was employed to examine the dynamic response of the pump, determine its natural frequencies, and identify possible resonance conditions. A CAD model of the pump–vessel assembly was developed, meshed, and analyzed under actual boundary conditions. The results showed several natural frequencies ranging between 23.16 and 26.65 Hz, which are close to the excitation frequency, suggesting a very high likelihood of resonance. Various structural modifications were then evaluated, including a half casing and two types of full casings. Among these, the full casing B design provided additional stiffness in the motor support area; however, none of the modifications effectively reduced vibration within the internal components. Based on these findings, the study recommends the implementation of a dynamic vibration absorber (DVA) tuned to the excitation frequency, along with the redesign of structural components to shift natural frequencies away from operating excitation. These solutions are expected to improve operational stability, extend equipment lifespan, and enhance overall system reliability. The outcomes of this research provide important insights for managing vibration issues in pump systems operating under similar conditions, particularly in the oil and gas industry where continuous, stable operation is critical.
Co-Authors AA Sudharmawan, AA Agus Sujatmiko Agustryana, Lisa Aji, Supa Kusuma Amrullah, Utsman Syah Asrori Asrori Cahya, Delila Chandra Wiharya Delila Cahya Permatasari Eko Yudiyanto Elka Faizal Farida, Nike Nur gumono Isa Triyanti Santoso Juliarsyah, Mohammad Rizanto Khambali Khambali KHOIRUL ANWAR Kris Witono Listiyono, Listiyono Monasari, Ratna Nugroho, Pipit Wahyu Nurhadi Prasetyo, Ryan Purwoko Purwoko Purwoko Purwoko Puspito Buwono, Haris Ryan Prasetyo Santoso Santoso SANTOSO SANTOSO Satworo Adiwidodo Setiawan, Budhy Sugeng Hadi Susilo Triyanti, Isa Umro, Virna Virna umro Audiana Yuni Pungkiarto, Irwanda Yuniarto Agus Winoko, Yuniarto Agus