493 research outputs found
Model Identification of Continuous Fermentation under Noisy Measurements
No full textThe dynamic model concept plays a central role in automatic control. Understanding the dynamic behavior of chemical and biological processes depends first on understanding the steady state behavior of these processes, then the dynamic characteristics of the process (e.g., the time constant, gain and deadtime) can be used to determine how long it takes to approach the new steady state and what path the process takes. The dynamic models can be used for bioprocess design, analysis of bioprocess control approaches, operator training, and start-up / shutdown strategy development. This paper will present bioprocess model identification of continuous fermentation for gluconic acid production under measurement noise. In this study, the input and output data was generated from first principle dynamic bioprocess model using Contois kinetic model and mass balances. Simulated measurement noises were then added to process variables. The data was then analyzed using System Identification Toolbox in Matlab. The final results obtained are in the form of Laplace-transfer functions
Kendali Sistem Bioreaktor Kontinyu
Get PDFTujuan dalam industri bioproses umumnya adalah memaksimalkan pertumbuhan mikroba dan / atau produksi beberapa senyawa yang dihasilkan oleh mikroorganisme. Untuk mencapai hal ini dengan cara yang efisien, maka diperlukan untuk menjaga lingkungan yang sesuai untuk mikroorganisme setiap saat. Tujuan utama penelitian ini adalah untuk menerapkan algoritma kendali PI (Proporsional integral) dan PID (Proporsional Integral Derivative) untuk suatu sistem bioproses. Kriteria Bode kemudian diterapkan untuk memeriksa kestabilan sistem diikuti dengan penentuan parameter pengendali menggunakan metode TLC (Tyreus-Luyben). Hasil simulasi lintas tertutup menunjukkan kinerja pengendalian yang dapat diterima
Simulasi Pengendali Proporsional Integral pada Proses Penguapan
Get PDFMakalah ini mempresentasikan metode penyaringan signal input gradien sehingga dapat meningkatkan kinerja sistem pengendalian bila terjadi gangguan (noise) pada pembacaan sensor. Sistem pengendalian yang dipelajari adalah sistem pengendalian unit penguapan. Cao (2004) telah mempublikasikan suatu strategi pengendalian desentralisasi pada unit operasi penguapan. Keunikan strategi yang diajukan Cao terletak pada perlunya untuk mengendalikan suatu variabel baru yang merupakan fungsi dari data yang berasal dari sensor-sensor yang tersedia. Kondisi optimal pada sistem pengendalian yang ditinjau perlu dijabarkan terlebih dahulu secara matematis dan dinyatakan sebagai gradien yang merupakan fungsi dari berbagai variabel proses. Gradien tersebut kemudian dikendalikan dengan tujuan lebih lanjut untuk mengendalikan variabel sebenarnya. Keuntungan penerapan saringan signal input gradien pada studi ini dinyatakan dalam reduksi biaya operasi yang dibandingkan dengan pengendalian gradien tanpa penyaringan
Metode Optimasi Pada Sistem Pengendalian Proses Tangki Pemanas Berpengaduk
Get PDFPada penelitian ini, penyetelan pengendali PID (Proportional Integral Derivative) dilakukan dengan metode optimasi dan hasil akhirnya dibandingkan dengan metode penyetelan lain (yaitu metode sintesa langsung dan Ziegler-Nichols). Tujuan penelitian adalah mendapatkan response output terbaik ketika terjadi perubahan set point dan terjadi gangguan. Penyetelan pengendali adalah proses yang berguna dalam menetapkan parameter pengendali yang dapat mempengaruhi response output dari perubahan setpoint (masalah servo) maupun ketika terjadi gangguan (masalah regulatori). Kinerja pengendali dapat dievaluasi dari harga SSE (Sum Squares of Error) ketika sistem dikendalikan oleh pengendali PID yang disetel dengan metode tertentu. Hasil penelitian menunjukkan bahwa metode optimasi tampak lebih baik dari metode lainnya karena memberikan kinerja terbaik
Teknologi Pengolahan Buah untuk Desa Duyung, Trawas, Mojokerto
Get PDFThe purpose of the community service activities in the Desa Duyung, Kecamatan Trawas, Kabupaten Mojokerto is mainly to equip the durian farmers with appropriate technologies for fruit, seeds and waste processing completely; in order to overcome low price problem of second grade durian as well as women role empowerment. Proposals to address these issuesinclude:1) durian fruit processing into jams, 2) durian seed processing into chips of various flavors, 3)utilization of durian skin into fuel, 4)salak fruit processing into jams when not in durian season, and 5) banana processing into chips of various flavors when not in durian season. Some equipments and training necessary for the process had been delivered. Participants from two groups (PKK and Farmer Group) were asked to fill a qustionaire before and after the experiment and the results were presented in this paper
Perbandingan Model Kinetika Hidrolisa Enzimatis Sabut Kelapa
Get PDFThis article will show a comparison of the reaction kinetics model of enzymatic batch hydrolysis of coconut coir. This reaction is required as one of the stages in the conversion process of lignocellulosic biomass into alternative fuels. Kinetics model plays an important role in explaining the performance and characteristics of the process. Kinetics model can easily be used to control and predict the properties of the process. Kinetics data was obtained from laboratory experiments enzymatic hydrolysis reaction batch of coconut coir by pretreatment using dilute NaOH solution. Profile data will be modeled by first order dynamic model and the results will be compared to power mode
PI Control of a Continuous Bio-Reactor
No full textA bio-reactor is a vessel in which chemical process is carried out which involves organisms or biochemically active substances derived from such organisms. On the basis of mode of operation, a bio-reactor may be classified as batch, fed batch or continuous (e.g. a continuous stirred-tank reactor model). An example of a continuous bio-reactor is the chemostat. This paper investigates a PI (Proportional Integral) control of a continuous bioreactor which is tuned by direct synthesis method. Process performance for servo problem were presented in this paper
Regulatory performance of two different tuning methods for milk cooling control system
Get PDFTemperature is one of the essential factors for bacterial growth in milk. The higher the temperature, the faster the growth of bacteria. It is empirically proven that the bacteria will stop growing at the temperature of about 4˚C. In this research, continuous milk cooling process
was simulated and then controlled by using Proportional - Integral (PI) feedback control system. The regulatory performance of the two different tuning methods were then analyzed (i.e Tyreus - Luybean and Hagglund – Astorm). Their SSE (sum squared of errors) were compared. It was found that Tyreus – Luyben method gave better regulatory performance than Hagglund – Astorm
Rekayasa Sistem Proses untuk Indonesia: Pidato Pengukuhan Guru Besar dalam Bidang llmu Teknik Kimia Fakultas Teknik Universitas Surabaya 20 Desember 2023
No full textTeknologi Pengolahan Buah untuk Desa Duyung, Trawas, Mojokerto
Get PDFThe purpose of the community service activities in the Desa Duyung, Kecamatan Trawas, Kabupaten Mojokerto is mainly to equip the durian farmers with appropriate technologies for fruit, seeds and waste processing completely; in order to overcome low price problem of second grade durian as well as women role empowerment. Proposals to address these issuesinclude:1) durian fruit processing into jams, 2) durian seed processing into chips of various flavors, 3)utilization of durian skin into fuel, 4)salak fruit processing into jams when not in durian season, and 5) banana processing into chips of various flavors when not in durian season. Some equipments and training necessary for the process had been delivered. Participants from two groups (PKK and Farmer Group) were asked to fill a qustionaire before and after the experiment and the results were presented in this paper
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