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All Journal Jurnal Keteknikan Pertanian Jurnal Agritechno
Lenny Saulia
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Engineering Environmental Science

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Development of Dynamic Local Work Load Measurement Method Using Electromyography (EMG) (an experimental measurement with drilling activities) Lenny Saulia; Sam Herodian; I Dewa Made Subrata
Jurnal Keteknikan Pertanian Vol. 16 No. 1 (2002): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.016.1.%p

Abstract

This paper presents a scheme to build a system of musculosceletal maesurement using Electromyography and for measuring physical dynamic workload of local muscles, i.e., drilling activities. Electro-myography (EMG) can be signal of muscle contractions and provides continous record as the analog signal. The result of this dynamic local workload measurement show a nonlinear relationship between peak level power spectra of EMG signal and torque. the work load for drilling 0.8 mm to 5 mm plate activities ranges between 0,1513 to 1, 6979 Joule.
Pengembangan Sistem Aquisis Data Kadar Nitrogen Tanah Berbasis Sensor Infra Merah Sebagai Pedoman Penentuan Dosis Pemupukan Abdul Roni Angkat; I Wayan Astika; Lenny Saulia
Jurnal Keteknikan Pertanian Vol. 25 No. 2 (2011): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (814.777 KB) | DOI: 10.19028/jtep.025.2.%p

Abstract

Abstract Site specific nitrogen fertilizing  needs an accurate map of soil nitrogen content. The use of sensors operated upon the soil is a promising method since the accurate soil sampling methods are costly and time consuming. The objectives of this research are to determine the relation between soil nitrogen level and near infrared spectrum using artificial neural network (ANN) and to develop soil nitrogen content data acquisition system for static dan dynamic measurement. The results showed that the 1506 nm wavelength can be used to estimate the soil nitrogen content. Furthermore it was found that static measurement showed a better correlation (R2= 0.6286) than the dynamic measurement (R2=0.3111). Combined with the developed ATMega32 microcontroller based display recorder, the precision of N content measurement achieved 0.12% wb with 0.1% wb noise. Keywords : NIR, soil nitrogen level, data acquisition, artificial neural network, precision farming Abstrak Pemupukan unsur hara nitrogen spesifik lokasi membutuhkan sebuah peta nitrogen tanah yang akurat. Penggunaan sensor untuk pengujian tanah dapat dijadikan alternatif menggantikan metode konvensional yang membutuhkan waktu yang lama dan biaya yang mahal. Penelitian ini bertujuan untuk membangun hubungan antara komposisi kadar nitrogen tanah dengan spektra Near Infrared (NIR) menggunakan jaringan saraf tiruan (JST) dan membuat sistem akuisisi data kadar nitrogen tanah pada pengukuran statis dan dinamis. Hasil penelitian menunjukkan panjang gelombang spesifik yang dapat digunakan untuk menduga kadar nitrogen tanah adalah pada panjang gelombang 1506 nm. Hubungan antara kadar nitrogen dan tegangan reflektan pada pengukuran statis menunjukkan hubungan yang lebih baik dengan R2 sebesar 0.6286 dibandingkan pada pengukuarn dinamis dengan R2 sebesar 0.3111. Simulasi sistem akuisisi data  kadar nitrogen tanah menggunakan mikrokontroler ATMega 32 yang dilengkapi dengan display memberikan ketelitian sebesar 0.12% berat dengan noise sebesar ±0.1 % berat. Kata kunci: NIR, kadar nitrogen tanah, akuisisi data, Jaringan Saraf Tiruan, pertanian presisi.Diterima:28 Juni 2011 ; Disetujui: 26 September 2011
Desain Model Diagnostik Resiko Ergonomi pada Kelapa Sawit Secara Manual Nugraha Sani Dewi; M. Faiz Syuaib; Lenny Saulia
Jurnal Keteknikan Pertanian Vol. 3 No. 1 (2015): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1110.755 KB) | DOI: 10.19028/jtep.03.1.%p

Abstract

AbstractOil palm harvesting activity is mostly done by ‘human power’ manual handling, therefore the activity may cause work safety and health problems.This research is deal with anthropometry, motion study andbiomechanic to find out the risk of manual handling and to develop ergonomic assessment model of oil palm harvesting. This model was designed in the aims to find out better work motion, good procedure and better design of harvesting tool, so the manual harvesting can be done in more safe, efficient and productive. The formula for the appropriate distance between harvester’s position and the tree and the length of egrek show that oil palm harvesting for more than 16 m bunches’s height is not safe with ‘egrek’. Critical load for neck, shoulder and forearm are 21.85 N, 1091.96 N and 1634.31 N. Ergonomic risk assesment’s tool of oil palmmanual harvesting was designed with the parameter: appropriate distance (dt), the length of egrek (lp), critical range of motion (CRM) and critical load (CL) for neck, shoulder and forearm.Keywords: biomechanic, ergonomic, motion study, manual harvesting, oil palm.AbstrakPemanenan kelapa sawit secara manual berpotensi menimbulkan permasalahan keselamatan dan kesehatan kerja. Penelitian ini dilakukan dengan pendekatan biomekanik, studi gerak dan antropometri untuk mendesain model diagnostik resiko ergonomi pada pemanenan kelapa sawit secara manual. Model ini didesain untuk menghasilkan gerak kerja pemanenan dan prosedur pemanenan yang lebih baik serta rekomendasi panjang egrek yang dibutuhkan sehingga kegiatan pemanenan dapat dilakukan secara aman, efektif dan produktif. Hasil simulasi pemanenan menghasilkan formulasi jarak aman dt (m) dan formulasi panjang egrek yang dibutuhkan lp (m). Berdasarkan formula tersebut, pemanenan kelapa sawit dengan tinggi target pohon lebih dari 16 m sudah tidak aman untuk dilakukan dengan menggunakan egrek. Batas beban (critical load) yaitu 21.85 N untuk otot leher, 1,091.96 N untuk otot deltoid bahu dan 1,634.31 N untuk otot branchioradialis lengan bawah. Model diagnostik resiko ergonomi pada pemanenan kelapa sawit telah dirancang dengan parameternya adalah jarak aman (dt), panjang batang egrek yang dibutuhkan (lp), critical range of motion (CRM) dan critical load (CL) pada leher, bahu dan lengan bawah.Kata kunci: ergonomika, studi gerak, biomekanik, kelapa sawit, pemanenan.Diterima: 28 Oktober 2014; Disetujui: 20 Januari 2015
RANCANG BANGUN DAN PENGUJIAN ALAT TANAM MURBEI Syahrial Sabaniah; Radite Praeko Agus Setiawan; Wawan Hermawan; Lenny Saulia
Jurnal Agritechno Jurnal Agritechno Vol. 15, Nomor 2, Oktober 2022
Publisher : Depertemen Teknologi Pertanian Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/at.vi.701

Abstract

Mulberry (Morus Sp.) is widely used in sericulture as silkworms’ fodder. Aside from being a silkworm feed, mulberry plants can also be used as food crops, animal feed and medicine. Mulberry plant breeding can be done by two methods, generative method (through seeds) and vegetative method (part of the plant itself). Vegetative seedlings methods have been done by many silk farmers. Vegetative techniques are relatively easier to do and quickly get leaf production. Vegetative techniques that are mostly used is stake. In mulberry cultivation, one of the processes that consumes a lot of energy is the planting process. Planting mulberry stake is still done manually. In this study planter will be designed which are expected to increase the capacity and efficiency of planting. The design process includes a preliminary study in the form of a study of material characteristics to determine design criteria. After that, the selection of components and mechanisms is carried out, followed by making drawings and prototypes. Planter prototypes tested with static test to evaluate the function of metering device. The Result obtained collecting function error is 0.5 % with one case where metering device fail to collect and zero case of more than one stake collected. The average of damaged stake is 2 % but mostly happen in left metering device with 4 %. The number indicates that modification is needed.
Co-Authors Abdul Roni Angkat I Dewa Made Subrata I Wayan Astika M. Faiz Syuaib Nugraha Sani Dewi Radite Praeko Agus Setiawan Sam Herodian Syahrial Sabaniah Wawan Hermawan