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Rianto Wibowo.
Teknik Mesin - Universitas Muria Kudus
Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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The effect of temperature, pressure, and grind size on Total Dissolved Solids (TDS) and extraction yield of semi-automatic espresso machines Winarso, Rochmad; Khoeron, Slamet; Wibowo, Rianto; Darmanto, Darmanto
Jurnal Polimesin Vol 22, No 3 (2024): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i3.4636

Abstract

The number of coffee shops in Indonesia has grown from 1,083 stalls in 2016 to over 2,937 booths in 2019, representing a threefold growth. Coffee shop establishments must provide two essential kinds of equipment: espresso machines, which use pressure, and filter machines, which employ infusion. The issue lies in the exorbitant cost and immense power requirements of semi-automatic and automated espresso machines, which necessitate the use of a manual espresso machine for commercial operations. The equipment can generate satisfactory espresso but encounters several challenges; specifically, the espresso generated is characterized by inconsistency, constantly varying in quality. This might arise due to the erratic nature of the manufacturing process. The two objectives of this study are: (1) to design an economically efficient semi-automatic espresso machine capable of producing products that meet the international quality standards set by the Specialty Coffee Association (SCA standard) and (2) to investigate the impact of critical factors such as pressure, temperature, and grind size, on the consistent quality of the resulting coffee (measured by Total Dissolved Solids (TDS) and extraction yield (EXT)). The research employs the Research and Development (RD) methodology. The research findings indicate that the optimal levels of Total Dissolved Solids (TDS) and extraction yield (EXT) may be attained by using a pressure setting of 8 bars, a temperature of 90ºC, and a grind size of 3.2 on the scale. The technique for optimizing the response resulted in Total Dissolved Solids (TDS) levels of 10.03% and extraction yield (EXT) values of 19.56%. The results have been deemed acceptable based on the criteria set by the global standards of Specialty Coffee Association (SCA).
Pengaruh grind size dan tipe portafilter terhadap kualitas espresso pada mesin espresso sistem pneumatik Winarso, Rochmad; Khoeron, Slamet; Wibowo, Rianto; Darmanto, Darmanto
JURNAL CRANKSHAFT Vol 6, No 2 (2023): Jurnal Crankshaft Vol. 6 No. 2 (2023)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/crankshaft.v6i2.11021

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh temperature, grind size dan jenis portafilter terhadap kadar total dissolved solids (TDS) dan extraction yield (EXT) dan menemukan pengaturan mesin kopi espresso sistem pneumatik yang optimal untuk mencapai kualitas terbaik. Pada penelitian ini dilaksanakan dengan menguji karakteristik kopi espresso yaitu kadar total dissolve solid (TDS) dan extraction yield (EXT) akibat pengaruh temperatur, grind size dan tipe portafilter. Desain eksperimen faktorial penuh (full factorial design of experiments - FFD) digunakan untuk mengidentifikasi variabel yang memiliki pengaruh yang signifikan pada kualitas espresso yang dihasilkan. Data penelitian diolah menggunakan analisa varian (analysis of variance - ANOVA) dengan bantuan perangkat lunak Minitab. Hasil penelitian menunjukkan bahwa temperature, grind size dan tipe portafilter secara  statistik memiliki pengaruh yang signifikan dengan tingkat kepercayaan 100% dalam mempengaruhi kadar total dissolved solids (TDS). Grind size dan tipe portafilter secara statistik juga memiliki pengaruh signifikan terhadap extraction yield (EXT) dengan tingkat kepercayaan 100%. Sebaliknya, nilai p-value yang lebih tinggi untuk faktor temperatur menunjukkan bahwa faktor tersebut secara statistik tidak memiliki pengaruh signifikan terhadap extraction yield (EXT). Hasil optimasi respons untuk kadar total dissolved solids (TDS) dan extraction yield (EXT) menghasilkan niai composite desirability (D) sebesar 0,7255. Dari nilai tersebut dapat disimpulkan bahwa kondisi optimal yang ditemukan melalui plot optimasi cukup dapat diandalkan dan sesuai dengan model regresi yang telah diuji secara kredibel. Variabel yang dapat menghasilkan kadar total dissolved solids (TDS) dan extraction yield (EXT) paling optimal didapat dari pengaturan temperatur 1000C, grind size 2.8 dan penggunaan un-pressurized portafilter. Kadar total dissolved solids (TDS) dan extraction yield (EXT) yang dihasilkan dari metode respon optimasi ini masing-masing sebesar 11,5252% dan 22,348%.
Karakterisasi sifat mekanis paduan aluminium dari daur ulang velg untuk produk truck skateboard melalui metode investment casting Slamet, Sugeng; Kurniawan, Iwan Agus; Wibowo, Rianto
JURNAL CRANKSHAFT Vol 6, No 2 (2023): Jurnal Crankshaft Vol. 6 No. 2 (2023)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/crankshaft.v6i2.11052

Abstract

Skateboarding adalah olahraga yang menggunakan papan berroda yang berjalan lurus kedepan dengan melewati berbagai rintangan. Truck merupakan salah satu komponen penting berguna sebagai penyangga skateboard terpasang di bawah board. Fabrikasi truck banyak dikerjakan dengan proses permesinan dengan detail kompleksitas dan kepresisian tinggi. Hal ini menjadi kesulitan yang dirasakan pada industri manufaktur. Penelitian ini bertujuan untuk mengembangkan teknik pengecoran logam dengan metode investment casting menggunakan paduan aluminium. Material yang digunakan paduan Aluminium dari proses daur ulang velg motor. Fabrikasi dilakukan melalui metode invesment casting dengan membuat pola menggunakan limbah lilin industri batik. Proses pengecoran dilakukan dengan memperhatikan temperatur tuang sesuai komposisi paduan. Pengujiaan mekanis dilakukan dengan uji kekuatan tarik (ASTM E8M ) dan kekerasan ( HRC). Karakterisasi terhadap paduan Aluminium daur ulang velg motor menunjukkan komposisi 93,8%Al dan 4,4%Si. Sifat mekanis terhadap nilai  kekuatan tarik sebesar 121,89 MPa, modulus elastisitas 721,93 MPa dan nilai kekerasan 63,33 HRC. Metode investment casting mampu diterapkan untuk memproduksi truck skateboard dengan detail komplek dan kepresisian.
Orthopedic cast design and simulation: innovations for improved patient care Winarso, Rochmad; Wibowo, Rianto; Hidayat, Taufiq; Laksono, Dwi Agung
JURNAL CRANKSHAFT Vol 7, No 1 (2024): Jurnal Crankshaft Vol.7 No.1 (2024)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/crankshaft.v7i1.12215

Abstract

Some problems that often happen with clay casts are limited joint movement, muscle loss, and lower blood flow. There is a higher chance of systemic problems like clotting, local allergic reactions, skin trauma, compartment syndrome, and heat injuries. Plaster casts can cause skin sores from the pressure on the skin, skin infections, rashes, and stiffness in the joints over time. To get around these problems, many methods combining reverse engineering (RE) and additive manufacturing (AM) have been tested and shown to be effective in healing orthopedic casts problems, which are common fractures. Finite element analysis may be used to forecast the mechanical characteristics of devices such as orthopedic casts. In this study, we will use finite element analysis to examine the orthopedic cast designs' mechanical properties. Acrylonitrile butadiene styrene (ABS) was chosen as the material for this investigation because ABS is a recyclable material. A reduction in safety factor is observed as the weight imparted to the model increases. The utmost recommended burden at loading position 1 is 50 pounds of force. According to the findings derived from the simulations, the application of a 50-pound force burden will yield a safety factor of three. 10 pounds is the utmost weight that is recommended for loading position 2. This is based on the findings of the modeling, which suggest that the 10 lbf loading will generate a safety factor of 3.3. The maximum burden capacity that is advised for loading position 3 is 13 lbf. The deduction of this conclusion is supported by the simulation outcomes, which demonstrate that a 13-pound force application yields a safety factor of 3.01. 220 lbf is the utmost recommended force for loading position 4. Because the 220 lbf loading will produce a safety factor of 3.0, this is the case.
Co-Authors AA Sudharmawan, AA Abdul Rozaq, Imam Ahrori, Ardy Hafid Akhmad Zidni Hudaya Amilatul Amin Andre Arif Wicaksana Ardy Hafid Ahrori Arvian Restu Adjie Candra Kelviyan Nova Chatarina Umbul Wahyuni Darmanto Darmanto Dedy Rustianto Edy Suryono Fajar Nugraha Fery Ardyansyah Ginanjar Mohammad Noor Hafana, Ihgam Hendri Susanto Imanudin, Muhamad Kurniawan, Iwan Agus Laksono, Dwi Agung Marindho, Dwi Cahyo Marindho, Dwi Cahyo Masruki Kabib Masruki Kabib Masruki Kabib Masruki Kabib, Masruki Maulana, Muh Rizqi Muhammad Elyan Nila Khusnawati Noor, Ginanjar Mohammad Norivan Fitahuddin, Elshin Novanda Galih Romansyah Qoaruddin Qomaruddin rizaldi kurnia Rochmad Winarso Rois Thoriqul Aziz Roni Safii Rubianto, Budi Samsul K Slamet Khoeron Sugeng Slamet SULIES KURNIAWAN Sulistiyanto Sulistiyanto Sutono, Sugoro Bhakti Tanaka, Imam Ridwan Taufiq Hidayat Wahid, Muhammad Abdul wahyu widiarno Zelimkhan Yanderbiyev Alatas