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Analisis Kinerja Mesin Pendingin Termoakustik Performance Analysis of Thermoacoustic Refrigerator heldinawati hanifa haq heldinawati hanifa haq; agus purwanto agus purwanto
Jurnal Ilmu Fisika dan Terapannya (JIFTA) Vol 5, No 1 (2016): Jurnal Fisika
Publisher : Prodi Fisika, Departemen Pendidikan Fisika

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AbstrakTelah dilakukan penelitian untuk menyelidiki osilasi suhu pada gelombang stasioner, mengukur frekuensi resonansi pipa (resonator termoakustik) dan menguji sistem termoakustik. Metode yang digunakan untuk menyelidiki osilasi suhu pada gelombang stasioner adalah mengamati dan mengukur suhu di setiap titik dengan menggunakan sensor LM 35DZ bersamaan dengan mengukur amplitudo pada tiap titik menggunakan mic condensor. Metode yang digunakan untuk mengukur frekuensi resonansi adalah meletakkan mic condensor pada posisi (10,00 ± 0,05) cm di ujung pipa kemudian memvariasi frekuensi pada loudspeaker. Metode yang digunakan untuk menguji sistem termoakustik adalah meletakkan sensor suhu LM 35DZ pada tandon panas dan tandon dingin kemudian sistem dijalankan selama 100 menit. Hasil dari penyelidikan osilasi suhu pada gelombang stasioner menunjukkan bahwa terdapat beda suhu di posisi perut dan simpul gelombang stasioner yakni 0,2°C pada kondisi sistem tidak terisolasi (tanpa selubung styrofoam) dan 1,2°C untuk kondisi sistem terisolasi (dengan selubung styrofoam). Hasil dari pengukuran frekuensi resonansi pipa menunjukkan bahwa pipa memiliki frekuensi resonansi sebesar 392,8408 Hz dengan letak perut gelombang stasioner berada pada posisi (19,00 ± 0,05) cm. Hasil dari pengujian sistem termoakustik pada suhu ruangan 29°C menunjukkan bahwa beda suhu antara tandon panas dan tandon dingin setelah sistem dijalankan selama 100 menit adalah 7,22°C.Kata Kunci : gelombang stasioner, osilasi suhu, frekuensi resonansi, tandon panas dan dingin, termoakustik.AbstractThe study has been done to investigate the temperature oscillation in stationary wave, to measure the resonance frequency of the pipe, and to test thermoacoustic system. The method used to investigate the temperature oscillationwas by measuring the temperature at several points of resonator using LM 35DZ sensor and measuring the amplitude using mic condensor. The method used tomeasure theresonance frequencywas by placing a condensormicat position (10.00 ±0.05) cmfrom theend of the pipeand thenvarying thefrequencyof loudspeaker. The method used totest the thermoacousticsystemwas by placingthe temperaturesensorLM35DZat the hotandcoldreservoirsthenthe system was runfor 100 minutes. The results of investigation showed that there was a temperature diffrence of 0.2°Cbetween the antinodal and nodal of pointswhen the system was not isolated (without styrofoam) and 1.3°C for the isolated system (with styrofoam). The results of measurement of resonancefrequency showed that the pipe (thermoacoustic resonator) with length (80.00 ±0.05) cm had a resonance frequency of 392.8408 Hz and the antinodal at the position (19.00 ± 0.05) cm measured from the end of pipe. The results of the testing thermoacoustic system at room temperature (29°C) showed that the temperature difference between the hot and cold reservoirs after the system was run for 100 minutes was 7.22°C.Keywords : stationary wave, temperature
Construction of Loudspeaker Enclosure to Increase Loudspeaker Performance Imam Try Wibowo Imam Try Wibwo; Agus Purwanto Agus Purwanto
Jurnal Ilmu Fisika dan Terapannya (JIFTA) Vol 5, No 3 (2016): Jurnal Fisika
Publisher : Prodi Fisika, Departemen Pendidikan Fisika

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            A study has been done to construct loudspeaker enclosure of bass-reflex baffle type, to characterize the modelling of loudspeaker enclosure of bass-reflex baffle type into the electrical circuit, and to investigate the frequency response of loudspeaker enclosure of bass-reflex baffle type with respect to the efficiency of loudspeaker performance.            The method used to construct loudspeaker enclosure of bass-reflex baffle type was determining elements of loudspeaker enclosure of bass-reflex baffle type, modelling loudspeaker enclosure of bass-reflex baffle type into the electrical circuit, and determining the frequency response based on the analogues circuit. The method used to investigate the frequency response of loudspeaker enclosure of bass-reflex baffle type was making graph of the frequency response using ORIGIN50 software.            The results of construction of loudspeaker enclosure was the bass-reflex baffle with volume of the box (30x30x50) cm3 using loudspeaker woofer of CURVE brand with diameter of 10 inches and wood of MDF with thickness of 12 mm. The results of characterizing the modelling of loudspeaker enclosure of bass-reflex baffle type were as follows: the inductance was (0.373 0.003) mH, the electrical resistance was 6 , the mass of diafragm and voice coil was (20.04 0.01) g, the mechanical damping was (2.82 0.02) Ns/m, the compliance was (4.8 0.2)10-4 Nm, the air particle acoustical mass vibrated by diafragm was (0.3 0.1)102 kg/m4, the acoustical resistance in front and rear of diafragm was (2.2 0.4) Ns/m5, the acoustical capasitance of the box was (2.82 0.07)10-7 m5/N, the acoustical mass of the box was (2.27 0.01) kg/m4, the acoustical mass of the port was (0.3 0.1)102 kg/m4, the acoustical resistance of the port was (1.1 0.5)102 Ns/m5, the acoustical mass in front of the port was (4.92 0.04) kg/m4, the acoustical resistance in front of the port was (2.2 0.4) Ns/m5 and showed that the frequency response was similar to a lowpass filter with working region at the frequency range of (65-220) Hz. The results of measurement of the frequency response of the bass-reflex baffle showed that the frequency response was similar to a lowpass filter with working region at the frequency range of (69.98-199.18) Hz and showed that woofer loudspeaker performance could be more efficient.Keyword: loudspeaker, woofer, enclosure, bass-reflex baffle, element, analogy, frequency response, MDF
ANALISIS DISTRIBUSI SUHU PADA RANCANG BANGUN PENETAS TELUR AYAM BERBAHAN KERAMIK ANALYSIS OF TEMPERATURE DISTRIBUTION OF CHICKEN EGG HATCHING INCUBATOR MADE FROM CERAMIC sindhu madya p sindhu madya p; agus purwanto agus purwanto
Jurnal Ilmu Fisika dan Terapannya (JIFTA) Vol 5, No 1 (2016): Jurnal Fisika
Publisher : Prodi Fisika, Departemen Pendidikan Fisika

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ABSTRAKPenelitian ini bertujuan untuk (1) mengetahui pola distribusi suhu dalam inkubator penetasan telur ayam, (2) mengetahui kemerataan distribusi suhu pada inkubator penetasan telur ayam berbahan keramik, dan (3) mengetahui suhu dinding-dinding inkubator agar distribusi suhu di dalam inkubator penetasan tersebar merata pada range (38,5-40,5). Metode untuk mengetahui distribusi suhu inkubator penetasan telur ayam adalah dengan metode analitik dari penyelesaian persamaan difusi panas pada inkubator penetasan. Karena inkubator penetasan berbentuk kotak berukuran dengan sumber pemanas kawat nikelin, penyelesaian persamaan difusi panas memanfaatkan persamaan difusi panas pada koordinat kartesian dan menggunakan metode pemisahan variabel. Untuk mendapatkan pola distribusi suhu dan melihat kemerataan distribusi suhu di dalam ruang penetasan telur, maka penyelesaian persamaan difusi panas pada inkubator penetasan divisualisasikan menggunakan software Matlab R2013a.Hasil dari penelitian ini menunjukkan bahwa pola distribusi suhu inkubator berfluktuasi berdasarkan fungsi waktu dan posisi. Pertambahan waktu menunjukkan bahwa suhu mencapai keadaan kesetimbangan (steady-state). Perbedaan posisi menunjukkan bahwa suhu memiliki nilai yang berbeda-beda dalam range (34,7-41,2) . Hasil pemerataan suhu ruang inkubator berdasarkan visualisasi dengan software Matlab R2013a menggambarkan bahwa distribusi suhu merata di dalam inkubator penetasan telur ayam dan pada sebagian besar titik diperoleh suhu ruang yang sesuai untuk penetasan telur ayam pada range (38,5-40,5).Kata kunci: difusi panas, inkubator penetasan telur, visualisasi, distribusi suhu.ABSTRACTThis research was aimed to (1) know the pattern of distribution of temperature of chicken egg hatching incubator (2) know of the evenness of distribution of temperature in the incubator made from ceramics, and (3) know the temperature of the walls of the incubator so that the distribution of temperature in the incubator spread evenly on the range of (38,5-40,5)℃. The method to find out the distribution of temperature of incubator was by using analytical method to solve heat diffusion equation in Cartesian coordinates using the method of separation of variables. In order to see clearly the distribution of temperature in incubator, the solution of heat diffusion equations was visualized by using Matlab R2013a. The results of this research showed that the pattern of distribution of the temperature of incubator fluctuated as a function of time and position. Increased time indicated that the temperature reached a state of equilibrium (steady-state). The difference of the position indicated that the temperature had different values in the range of (34,7-41,2)℃. Visualization using Matlab R2013a illustrated that the temperature was distributed evenly inside the incubator and at several points the temperature for hatching chicken eggs was on the range of (38,5-40,5)℃.Analisis Distribusi Suhu…(Sindhu Madya Z.P.) 2Keywords: diffusion of heat, hatching incubator, visualization, distribution of temperature.
ANALISIS PENGGERAK PADA SISTEM PENGAMAN PINTU BER-PASSWORD ANALYSIS OF ACTIVATOR OF PASSWORDED DOOR SECURITY SYSTEM Listiono Gandung; Agus Purwanto Agus Purwanto
Jurnal Ilmu Fisika dan Terapannya (JIFTA) Vol 5, No 3 (2016): Jurnal Fisika
Publisher : Prodi Fisika, Departemen Pendidikan Fisika

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Penelitian ini bertujuan untuk menganalisis kemampuan kerja dari beberapa komponen penggerak pada sistem pengaman pintu ber-password dan mengetahui unjuk kerja sistem pengaman pintu ber-password.Analisis komponen pada sistem pengaman ini meliputi analisis motor stepper beserta rangkaian kontrolnya dan analisis ulir daya. Analisis motor stepper meliputi pengujian torsi motor, kecepatan motor dan karakteristik masukan pada rancangan program, sedangkan analisis ulir daya digunakan untuk mengetahui torsi minimum yang dibutuhkan untuk memutar beban. Beberapa program yang digunakan untuk menganalisis komponen motor stepper adalah program Arduino dan program SpectraPLUS 5.0.Hasil penelitian menunjukkan bahwa torsi minimum yang dibutuhkan ulir untuk berotasi sebesar (0,036 ± 0,004) N.m, sedangkan torsi maksimum yang dihasilkan motor stepper sebesar (0,060 ± 0,003) N.m, sehingga dapat disimpulkan bahwa torsi yang dihasilkan motor stepper cukup untuk menggerakkan beban. Motor stepper diprogram dengan kecepatan putar sebesar 60 rpm yang tidak berpengaruh terhadap besar torsi motor melainkan mempengaruhi waktu rotasinya. Kecepatan 60 rpm dipilih karena lebih ideal dari kecepatan yang lain karena menghasilkan waktu yang lebih cepat saat menggeser pintu dan tidak menimbulkan kemacetan pada sistem. Hasil pengukuran menunjukkan bahwa motor stepper berotasi sebanyak 25 kali untuk menggeser pintu dan membutuhkan waktu sebesar (24,91 ± 0,01) s, sedangkan rotasi sebanyak 25 kali tanpa beban, akan membutuhkan waktu sebesar (24,14 ± 0,01) s. Dengan demikian disimpulkan bahwa beban mempengaruhi kecepatan motor.Kata kunci: kecepatan putar, torsi, motor stepper, dan ulir.This study aims to analyze the workability of several activators component of the passworded door security system and to find out the performance of door security with password system. Analysis of components of the safety system included analysis of stepper motor control and analysis of power screw. Analysis of stepper motor included testing the motor torque, the motor speed and the characteristics of the input on the design of the program, while the analysis of the power screw was used to determine the minimum torque required to rotate the load. Some programs used to analyze the component of the stepper motor were Arduino and SpectraPLUS 5.0.The results showed that the minimum torque required to rotate the screw was (0.036 ± 0.004) N.m, while the maximum torque produced by stepper motor was (0.060 ± 0.003) N.m, so it can be concluded that the stepper motor torque generated was enough to drive the load. Stepper motor was programmed with rotational speed of 60 rpms that did not affect to the motor torque but it influenced the time of rotation. Speed of 60 rpms was more ideal than the other speeds because it produced a shorter time to slide the door and did not cause congestion on the system. The measurement results showed that the stepper motor rotated 25 times to slide the door and took (24.91 ± 0.01) s, while the rotation of 25 times without a load, took time of (24.14 ± 0.01) s. Thus it could be concluded that the load affected the speed of the motorKeywords: rotational speed, torque, stepper motors, and screw