The Use of Finite Element Method in Analysing the Dynamic Characteristic of a Rotor System
dynamic characteristic;natural frequency;finite element method
Vibration analysis is very essential to be considered in designing a rotor system. The failure in rotor system parts can be avoided by understanding the dynamic characteristic. The objective of this research is to investigate the dynamic characteristic of rotor systems by using finite element method. Finite element method is used to reveal the system characteristic which is derived from the kinetic and potential energy equations. Some models of rotor systems are analysed to understand the dynamic characteristic. The natural frequencies are obtained from the eigen values. The simulation is carried out with the distance of disk from the support as the variable. The result shows that the distance between the disk and the bearing affects the natural frequency of the system.
Mubarak, Amir Zaki; Universitas Syiah Kuala
Jurnal Teknik Mesin Unsyiah; Vol 1, No 2 (2012); 86-89
Complex Eigenvalue Analysis of A Motorcycle Disc Brake Squeal
Motorcycle disc brake squeal, complex eigenvalue analysis, dynamic instabilities
This paper discusses the phenomenon of brake squeal of a disc brake system used at motorcycle with a capacity of 125 cc. The occurrence of disc brake squeal is associated with the dynamic instability of the system with the influence coefficient of friction. The dynamic instability of the system is predicted using finite element complex eigenvalue analysis. The analysis predicted three unstable modes in the frequency range below 5 kHz. The unstable modes occurred at the frequency of 1250 Hz, 1920 Hz, and 2306 Hz. The occurrence of unstable mode is indicated by the presence of positive real part of the corresponding complex eigenvalue. Unstable mode is shown by the occurrence of coupled vibration between eigenvectors of disc and brake pads vibrating at similar frequency which consists of diametral mode of disc and bending modes of pads. The analysis also showed that the unstable condition could occur at a value of coefficient of friction as low as 0.2.
Machmud, Muhammad Nizar; Syiah Kuala University
Jurnal Teknik Mesin Unsyiah; Vol 1, No 1 (2012); 36-41
Kajian Desulfurisasi pada Pembakaran Biobriket dengan Adsorben Berbasis Kalsium
Biobriquette; adsorbents calcium based; desulphurization; efficiency; reaction desulphurization kinetics
Combustion of biobriquette produced from coal and palm shell generate considerable energy. However beside generating biobriquette energy it also produces emissions gas. Emissions gas resulting from combustion include SOx, NOx, CO and CO2. Calcium is an adsorbent often used to adsorb released SO2 gas in the combustion process. The purpose of this study is to seethe effect of combustion temperature and type of adsorbent used in biobriquette to evaluate the efficiency of absorption of SO2 and the kinetics of the reaction of SO2 gasabsorption as a function of combustion biobriquette ratio Ca/S (mol / mol) on coal and palm shell ratio of 90:10 (w/w). In this study, the ratio of Ca/Swas Specified at1:1, 1.25:1, 1.5:1, 1.75: 1 and 2:1. Combustion temperatures used were 300, 350, 400, 450 and 500°C. The result of this study showed the decrease levels of SO2 for scallop shell and green mussels was highest at the ratio Ca/S2: 1. The highest absorption of efficiency adsorbent for scallop shells are produced at the ratio of Ca/2:1 at temperatures 400°C, equals to 90.59%. Meanwhile for the green mussels, the highest efficiency was resulted ratio of Ca/S 1.5:1 at temperatures 400°C which was equals to 84.74%. Reaction rate constants of absorption in the biggest adsorbent of scallop shells produced at ratio Ca/S 1:1 equals to 0.265, while the biggest reaction rate constants of adsorbent green mussels produced at being Ca/S 1.5:1equals to 0,198.
Jurnal Teknik Mesin Unsyiah; Vol 1, No 4 (2013); 157-161
Kaji Sistem Peralatan Penyerap Kalor pada Kotak Penyimpan Darah
blood cold storage; thermoelectric module; fin
This research aims to produce an effective heat sink with thermoelectric which is a semi conductor devices having several pairs of type P (positive) and N (negative) S content. Type P has a lower energy level while type N had a higher energy level. This tool, equipped with a heat sink as the heater, is mounted on a chamber to create a heat exchanger for a portable cooler box. Three types of thermoelectric modules were used with different fin types to find out the their effects on the temperature, T, and the rate of heat transfer, Q, inside the cooler box. The results shows that with the blood volume of 250 cc, the blood temperature can be decreased from 29 oC to 5.8 oC within 145 minutes. The ideal temperature for the blood storage ranges from 1 oC to 6 oC. Among the three types of fins that were tested, the most effective heat transfer was given by fin type no. 3, the cylindrical-shaped fins. The heat transfer obtained is 12.83 W/m2 oC. The lowest heat transfer was given by fin type no. 2, which is a slot type, with heat transfer rate of 3.85 W/m2 oC.
Situmeang, Dogar; Universitas Malikussaleh
Jurnal Teknik Mesin Unsyiah; Vol 1, No 3 (2013); 111-118
GOVERNMENT EXPENDITURES ON EDUCATION, RESEARCH AND DEVELOPMENT (R&D) AND THEIR IMPACTS ON THE INDONESIAN ECONOMY
This paper is aimed at descriptively discussing the impact of government expenditures on education, Research and Development (R&D) on the national economy of Indonesia. In the analysis, the method used in this research is library research with an in-depth analysis and discussion on many related policies that effect technological change and economic growth in Indonesia. The findings show that Indonesian government has introduced a number of supporting policies related to education as well as R&D to promote economic growth of the country. These policies generally have started since New Order government in the late 1960s. However, New Order government has put the strong bases to encourage trade openness and investment especially foreign investment. On the meantime, the government had also involved in free trade cooperation such as Asia Pacific Economic Cooperation (APEC) which will be applied 2020 for the developing countries and 2010 for the developed countries. Even the government has generated numbers of favourable policies to attract foreign investment and fastening economic growth, the policies in generating public R&D has been not well developed. The government budget spends for public R&D is still low (around 2 percent every year). Based on the research findings, it is recommended for the government to increase the spending on education and R&D in order to increase economic growth
Jurnal Pencerahan; Vol 8, No 1 (2014): Maret 2014
Majelis Pendidikan Daerah (MPD) Aceh dan Universitas Syiah Kuala
PENGELUARAN PEMERINTAH DAN PENDAPATAN TERHADAP PEMBANGUNAN PENDIDIKAN DI ACEH
This study aimed to analyze the effect of government spending on education and per-capita income to the development of education in the province of Aceh by using panel data. The literacy rate, enrollment rate of primary and secondary schools were utilised to measure the development of education sector as the dependent variable, while public spending on the education sector and per-capita income were used as the independent variables. This study covers 23 districts/cities in Aceh province over a period of years 2008-2012. Based on the Random Effect Model of panel data analysis, the study documented that the government spending on eduaction and percapita income positively and significantly impacted the literacy rate. However, the government spending on the education sector did not significantly influence the enrollment rate of primary school, junior high school, and senior high school. Although the percapita income have no significant impact to the primary school enrollment rate and junior high school, but it has an effect on the enrollment rate of senior high school. The results of this study imply that in order to promote the development of education in the province, the government should increase the budget allocation of income and expenditure for the education sector
Zulkifli, .; Fakultas Ekonomi, Universitas Syiah Kuala, Darussalam, Banda Aceh
Jurnal Pencerahan; Vol 9, No 1 (2015): Maret 2015
DARI DEWAN PENDIDIKAN NASIONAL SAMPAI DENGAN CSR
Jurnal Pencerahan; Vol 7, No 2 (2013): September 2013
Kompetensi Guru Produktif Dalam Meningkatkan Sikap Kewirausahaan Siswa Pada SMK Negeri 3 Banda Aceh
Kompetensi guru merupakan faktor utama untuk peningkatan kualitas pembelajaran. Seorang guru yang profesional harus memiliki beberapa kompetensi yaitu: kompetensi pedagogik, kompetensi kepribadian, kompetensi sosial dan kompetensi profesional. Adapun tujuan penelitian ini adalah untuk mengetahui pengembangan kompetensi guru produktif, Strategi pengembangan kompetensi guru produktif dan hambatan serta faktor yang mempengaruhi pengembangan kompetensi guru produktif. Penelitian ini menggunakan metode deskriptif dengan pendekatan kualitatif. Teknik pengumpulan data melalui observasi, wawancara dan studi dokumentasi. Subjek penelitian ini adalah kepala sekolah, guru produktif dan siswa. Hasil penelitian menunjukkan bahwa: (1) Pengembangan kompetensi guru produktif dalam meningkatkan sikap kewirausahaan siswa yang sedang dijalankan oleh RESA-SI untuk tenaga pengajar dan pengadaan fasilitas sekolah, di dalam raker sekolah dapat juga meningkatkan kompetensi guru melalui MGMP, (2) Pelaksanaan pengembangan kompetensi guru produktif ada tiga tahap pertama alat-alat pratikum, tahap kedua staf pengajar, tahap ketiga tentang penggunaan alat-alat pratikum, (3) Hambatan yang dihadapi kepala sekolah untuk meningkatkan kompetensi guru produktif dalam meningkatkan sikap kewirausahaan siswa pada SMK Negeri 3 Banda Aceh diantaranya sikap guru yang belum menekuni profesinya untuk menjadi guru profesionaldan melahirkan siswa kreatif menjadi terhambat
Jurnal Pencerahan; Vol 6, No 1 (2012): Maret 2012
PERAN MUSYAWARAH GURU MATA PELAJARAN PENJAKES DALAM PENYUSUNAN RENCANA PELAKSANAAN PEMBELAJARAN MODEL PROBLEM BASED LEARNING (PBL) DI SMP NEGERI DAN SWASTA KOTA BANDA ACEH
Peningkatan mutu pembelajaran di sekolah sangat tergantung pada peran guru dalam proses belajar mengajar di sekolah. Guru sebagai pengajar berperan aktif dalam merencanakan dan melaksanakan pembelajaran dan mempersiapkan kelengkapan administrasi guru. Kemampuan guru dalam mengelola pembelajaran sangat penting, kemampuan guru dalam menyusun Rencana Pelaksanaan Pembelajaran (RPP) dalam pelaksanaan Proses Belajar Mengajar sangat dibutuhkan guna meningkatkan hasil belajar siswa. Fokus penelitian adalah terkait dengan penggunaan model Problem Based Learning dalam Musyawarh Guru Mata Pelajaran untuk kalangan guru Penjakes di SMP Negeri dan Swasta Kota Banda Aceh. Penelitian ini dilaksanakan dalam dua siklus, dimana setiap siklus terdiri dari dua kali pertemuan. Setiap pertemuan terdiri dari empat tahap kegiatan, yaitu perencanaan, pelaksanaan, observasi dan refleksi. Yang menjadi subjek penelitian ini adalah guru SMP Negeri dan Swasta Kota Banda Aceh yang berjumlah 20 guru terdiri dari 12 guru laki-laki dan 8 guru perempuan. Penelitian ini dilaksanakan selama 3(dua) bulan yaitu bulan Januari sampai Maret 2014. Dari hasil penelitian ini dapat ditarik kesimpulan bahwa melalui pembinaan model PBL dapat meningkatkan kemampuan guru dalam menyusun RPP dan pelaksanaan pembelajaran di SMP Negeri dan Swasta Kota Banda Aceh
Jurnal Pencerahan; Vol 8, No 2 (2014): September 2014
PERANAN MANAJEMEN PERKANTORAN DALAM MEMPERLANCAR PEKERJAAN ADMINISTRASI KANTOR PT. BANK RAKYAT INDONESIA (BRI) PERSERO TBK. CABANG BANDA ACEH