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INTRODUKSI TEKNOLOGI PENGERING TENAGA SURYA UNTUK MENINGKATKAN PRODUKTIVITAS DAN PENDAPATAN USAHA KERUPUK UBI DI KECAMATAN KAMANG MAGEK KABUPATEN AGAM Adly Havendri; Dendi Adi Saputra; M. Eka Satria; Syafi’i Syafi’i
Jurnal Hilirisasi IPTEKS Vol 1 No 4.b (2018)
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (880.158 KB)

Usaha peningkatan nilai tambah ubi kayu dapat dilakukan dengan cara penganekaragaman produk olahan ubi kayu menjadi bahan setengah jadi (produk antara) yang selanjutnya dapat langsung dipasarkan atau menjadi produk makanan siap saji. Saat ini, di Kecamatan Kamang Magek Kabupaten Agam usaha penganekaragaman produk olahan ubi kayu banyak dilakukan oleh industri skala rumah tangga (IRT). Namun, dalam proses pengolahannya beberapa IRT masih menggunakan teknologi sederhana sehingga produktivitas dan pendapatan usaha terbatas pada kemampuan teknologi yang digunakan. IRT Erna (mitra) masih menggunakan metode pengeringan konvensional berupa pengeringan melalui panas matahari. Hal ini akan menyebabkan ketergantungan produksi kerupuk ubi terhadap perubahan cuaca. Ketersediaan teknologi pengering dengan menggunakan panas buatan sebagai pengganti panas matahari belum mampu menjadi solusi pengering kerupuk ubi bagi IRT pengolah kerupuk ubi di Sumatera Barat. Kerupuk ubi yang dikeringkan secara paksa menyebabkan ketidakmerataan suhu pengeringan pada produk kerupuk ubi. Untuk itu, perlu dilakukan introduksi teknologi pengering tenaga surya yang dirancang berdasarkan kebutuhan mitra. Dari hasil kegiatan ini dapat disimpulkan bahwa teknologi yang diintroduksikan mampu meningkatkan produktivitas produksi kerupuk ubi hingga 2 kali lipat dari proses produksi dengan menggunakan teknologi konvensional sebelumnya.

Pengaruh Variasi Persentase Campuran Polymer Polyester dan Vinyl Ester Terhadap Kekuatan Tegangan Lentur Nusyirwan Adnand; R Mutya; Firman Ridwan; Hairul Abral; Hendery Dahlan; Eka Satria
METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 2 (2021): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Polymer mixture of polyester and vinyl ester is widely used in engineering fields such as for car bumpers, boat bodies, ultra-light aircraft wings, wind turbine blades and others. One of the requirements to meet the application aspects in the engineering field is the ability of the material to withstand bending loads. For this reason, it is necessary to test the flexural stress characteristics of the mixture of the two polymers of unsaturated polyester and unsaturated vinyl ester. The aim is to find out which of the two polymer blends obtains superior flexural resistance properties from each of the polymers with respect to the blend percentage. To determine the flexural stress value of the polyester and vinyl ester mixture, a flexural stress test was carried out with reference to the standard flexural test or the bending test used based on ASTM D 790 by varying the composition of the mixture 100%: 0%, 90%: 10%, 80%: 20%, 60%:40%, and 0%:100%. From the results of the bending stress test on specimens with variations in the composition of polyester and vinyl ester with the hand lay-up method, the highest bending stress value is found in the composition of 60% polyester and 40% vinyl ester, which is 126.88 MPa ( an increase in maximum flexural strength of 255%)

Introduksi Teknologi Pengering Tenaga Surya Untuk Meningkatkan Produktivitas Dan Pendapatan Usaha Kerupuk Ubi Di Kecamatan Kamang Magek Kabupaten Agam Adli Havendri; Dendi Adi Saputra; Eka Satria; Syafi’i Syafi’i
METAL: Jurnal Sistem Mekanik dan Termal Vol 2, No 2 (2018)
Publisher : Department of Mechanical Engineering, Universitas Andalas

The micro, small and medium scale of industrial enterprises for cassava crackers is growing rapidly in Kamang Magek District of Agam Regency. Cassava crackers are the typical crackers which only find in the Agam Regency. The taste is crunchy and can be stored for a long time, making this cracker a special food souvenir. In the process of making, cassava is boiled and pounded so that it becomes pasta. Pasta will be formed and dried in the sun. The crackers that have been formed should be dried in a maximum of 1 day. Today, the makers of cassava crackers are still dependent on sunlight, so they often cannot meet market demand during the rainy season. Therefore, through the IbM (Ipteks bagi Masyarakat) program for the community funded by DIKTI, solar drying technology is introduced by using a type of solar tunnel. The result shows the drying time is 2 times faster than traditional drying process. Hopefully, this technology can help the community of the cassava crackers maker to increase their productivity.

Penghitungan Beban Kritis pada Struktur Kolom Kontinu dengan Dua Bentangan akibat Pembebanan Secara Aksial Eka Satria; Nusyirwan Nusyirwan; Muhammad Irfan
METAL: Jurnal Sistem Mekanik dan Termal Vol 2, No 2 (2018)
Publisher : Department of Mechanical Engineering, Universitas Andalas

This paper is aimed to determine the critical buckling load of continous column with two spans under axial loading. Firstly, the critical buckling loads is calculated theoretically based on concept of solid mechanic. The calculation is conducted for various ratio of L1/L2. This ratio shows a comparison of two span lengths. The used ratios in this calculation are L1/L2= 1/3,1/2, 2/3, 1/1, 3/2, 2/1, and 3/1. The critical buckling loads is calculated based on elastic analysis. For practical application, the results then are approached by regression technique of a least square method to find the best fit of design equation. Later, this equation is recommended as a practical equation in determining the critical buckling of continous column with two spans under axial loading.

Penghitungan Beban Kritis pada Struktur Balok-Kolom Akibat Pembebanan Secara Aksial dan Lateral Berbasiskan Metode Beda Hingga Eka Satria; N Nusyirwan; Deri Yunifki
METAL: Jurnal Sistem Mekanik dan Termal Vol 1, No 2 (2017): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

This paper is aimed to determine the critical buckling load of the beam-column structures for practical applications. Firstly, the critical buckling loads is calculated numerically based on finite difference method. For geometrical modeling, the structures are supported in three types of supports; pinned-roller, fixed-free, and fixed-pinned. Then, a geometry of the beam is varied in variation of slenderness ratio. The load is given in types of uniform distribution load, q, laterally and a concentrated load, P, axially. Using a computational program, the relationships of P/q to slendernes ratio, l, for all models are determined. The results then are approached by regression technique of a least square method in order to find a the best fit of equation. This equation is recommended as a practical equation for determining the critical buckling of the beam-column structures under variation of types of supports, slenderness ratio and rasio P/q.

Optimalisasi Proses Perakitan Pesawat Tanpa Awak dengan Metoda Critical Path Methods (CPM) Dendi Adi Saputra M; Eka Satria; Gusman Arif Pandy
Jurnal Optimasi Sistem Industri Vol. 15 No. 1 (2016): Published in March 2016
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/josi.v15.n1.p87-92.2016

The manufacturing of Unmanned Aerial Vehicles (UAV) requires a design process that involves the design of aircraft’s components such as fuselage, wing, horizontal stabilizer, vertical stabilizer, ailerons, elevators, tail, and wing. The process takes a long time. Therefore, the distribution of structural works based on their characteristics and classifications by considering their design attributes and manufacturing processes is required. This research aims to find the optimal time and critical path of the assembly process of an UAV based on product work breakdown structure (PWBS) and critical path method (CPM). The result reveals that the optimal assembly time is 139 minutes. Finally, the application of product-oriented structural work distribution and the optimization of the assembly activities involved in the critical path successfully minimize the duration of the assembly process.

A Numerical Study on the Effectiveness of U-Shaped Steel Metallic Dampers Applied to Braced Building Structures under Dynamic Loading Efrizal; Eka Satria; Irsal Oktofirnof; M. Raffi Akbar; Lovely Son; Dendi Adi Saputra; Mulyadi Bur
METAL: Jurnal Sistem Mekanik dan Termal Vol. 10 No. 1 (2026): METAL : Jurnal Sistem Mekanik dan Termal
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.10.1.8-15.2026

The increasing demand for seismic-resilient structures has encouraged the development of advanced energy dissipation devices capable of reducing structural damage under strong ground motions. Among various passive control systems, metallic dampers have gained significant attention due to their stable hysteretic behavior, high energy dissipation capacity, and simplicity of installation. This study investigates the seismic performance of a building structure equipped with U-shaped steel metallic dampers installed within a chevron bracing system. The research is conducted through two complementary analytical stages. First, a detailed nonlinear finite element analysis is performed to evaluate the cyclic behavior of the U-shaped damper, accounting for both material and geometric nonlinearities. The resulting hysteresis curves are used to determine the elastic stiffness and energy dissipation capacity of the damper. In the second stage, the obtained mechanical properties are implemented into a dynamic numerical model of a multi-story building, where the damper is represented as spring element connecting the bracing system to the main structural frame. Linear time-history analyses are then conducted under earthquake ground motions to assess the dynamic response of the structure. The seismic performance of the damped structure is compared with that of an identical structure without metallic dampers in term of dynamic response. The results demonstrate that the proposed U-shaped metallic damper significantly enhances seismic performance by reducing structural demands and concentrating inelastic deformations within replaceable energy-dissipating components

Effectiveness of Roof Structures as Dynamic Vibration Dampers in Buildings under Dynamic Loading Zeki Midi; Eka Satria; Irsal Oktofirnof; M. Raffi Akbar; Lovely Son; Mulyadi Bur
METAL: Jurnal Sistem Mekanik dan Termal Vol. 10 No. 1 (2026): METAL : Jurnal Sistem Mekanik dan Termal
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.10.1.78-87.2026

Buildings located in earthquake-prone regions are vulnerable to dynamic responses that may cause severe structural damage if not effectively controlled. One emerging approach for seismic response mitigation is the utilization of roof structures as dynamic damping systems. By appropriately tuning the mass, stiffness, and damping characteristics, roof structures can function as dynamic vibration absorbers through interaction with the main structural system. This study evaluates the effectiveness of roof structures acting as dynamic dampers in reducing the seismic responses of buildings. The research is conducted in two stages. The first stage involves a static analysis of U-shaped metallic dampers using the finite element method to determine stiffness and energy dissipation characteristics based on hysteresis curves obtained from cyclic loading. The second stage consists of a dynamic analysis in which the building structure and roof are modeled as a two-dimensional frame system, with metallic dampers installed between the building and the roof. Damper parameters are adopted from the static analysis results, while the roof mass is analytically determined to ensure its effectiveness as a dynamic damper. Dynamic analyses under earthquake excitation are performed to evaluate the reduction in structural displacement. The results indicate that roof-based damping systems can significantly reduce peak dynamic responses, particularly roof displacement and inter-story drift, demonstrating their potential to enhance the seismic performance of buildings in earthquake-prone regions

INTRODUKSI TEKNOLOGI PENGERING TENAGA SURYA UNTUK MENINGKATKAN PRODUKTIVITAS DAN PENDAPATAN USAHA KERUPUK UBI DI KECAMATAN KAMANG MAGEK KABUPATEN AGAM Adly Havendri; Dendi Adi Saputra; M. Eka Satria; Syafi’i Syafi’i
Jurnal Hilirisasi IPTEKS Vol. 1 No. 4.b (2018)
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar

Usaha peningkatan nilai tambah ubi kayu dapat dilakukan dengan cara penganekaragaman produk olahan ubi kayu menjadi bahan setengah jadi (produk antara) yang selanjutnya dapat langsung dipasarkan atau menjadi produk makanan siap saji. Saat ini, di Kecamatan Kamang Magek Kabupaten Agam usaha penganekaragaman produk olahan ubi kayu banyak dilakukan oleh industri skala rumah tangga (IRT). Namun, dalam proses pengolahannya beberapa IRT masih menggunakan teknologi sederhana sehingga produktivitas dan pendapatan usaha terbatas pada kemampuan teknologi yang digunakan. IRT Erna (mitra) masih menggunakan metode pengeringan konvensional berupa pengeringan melalui panas matahari. Hal ini akan menyebabkan ketergantungan produksi kerupuk ubi terhadap perubahan cuaca. Ketersediaan teknologi pengering dengan menggunakan panas buatan sebagai pengganti panas matahari belum mampu menjadi solusi pengering kerupuk ubi bagi IRT pengolah kerupuk ubi di Sumatera Barat. Kerupuk ubi yang dikeringkan secara paksa menyebabkan ketidakmerataan suhu pengeringan pada produk kerupuk ubi. Untuk itu, perlu dilakukan introduksi teknologi pengering tenaga surya yang dirancang berdasarkan kebutuhan mitra. Dari hasil kegiatan ini dapat disimpulkan bahwa teknologi yang diintroduksikan mampu meningkatkan produktivitas produksi kerupuk ubi hingga 2 kali lipat dari proses produksi dengan menggunakan teknologi konvensional sebelumnya.

PENYEDIAAN ENERGI LISTRIK DARURAT DAN PENANGANAN KRISIS AIR BERSIH UNTUK MASYARAKAT TERDAMPAK BANJIR BANDANG DI KABUPATEN PESISIR SELATAN Dendi Adi Saputra M; Devi Chandra; Eka Satria; Adjar Pratoto; Febrin Anas Ismail; Fauzan Fauzan; Abdul Hakam; Bambang Istijono
Jurnal Hilirisasi IPTEKS Vol. 8 No. 2 (2025)
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jhi.v8i2.851

The purpose of this community service activity is to assist the recovery of social activities and address the crisis of electricity and clean water following the flash floods in Pesisir Selatan Regency, particularly in Kampung Langgai and Barung-Barung Balantai Health Center, which were the most severely affected areas. The methods employed included conducting a needs assessment survey of the affected communities, procuring and installing a 5.5 kW generator set at Nurul Wahidah Mosque as a social center, distributing ten solar-powered lamps to residents’ homes, and rehabilitating the clean water system at the health center by replacing the water pump and installing new piping networks from the ring well and Pamsimas sources. Additionally, training was provided on the operation and maintenance of electrical equipment, along with socialization on the importance of clean water to prevent post-flood diseases. The results demonstrated a significant improvement in access to electricity and clean water in the affected areas. The mosque resumed its function as a center for social activities, homes and roads received adequate lighting, and health services at the health center became fully operational again. The conclusion of this activity is that appropriate technology-based interventions, such as the provision of generator sets, solar lamps, and water filtration system repairs, are effective in supporting post-disaster recovery and enhancing community resilience. The sustainability of the program can be strengthened through regular training and cross-sector collaboration to build resilient infrastructure in disaster-prone areas.

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