Jurnal Teknologi Dirgantara最新文献_第4页

Front Pages JTD Vol 16 No.1 Juni 2018 2018年6月第1期

Jurnal Teknologi Dirgantara Pub Date : 2018-09-17 DOI: 10.30536/j.jtd.2018.v16.a3017

Redaksi Jurnal

引用次数: 0

PENGEMBANGAN TEKNIK ANALISIS BERAT MOLEKUL HTPB UNTUK ACUAN DALAM KONTROL KUALITAS HTPB分子重量分析技术的发展，用于质量控制

Jurnal Teknologi Dirgantara Pub Date : 2018-09-17 DOI: 10.30536/J.JTD.2018.V16.A2871

H. Wibowo

{"title":"PENGEMBANGAN TEKNIK ANALISIS BERAT MOLEKUL HTPB UNTUK ACUAN DALAM KONTROL KUALITAS","authors":"H. Wibowo","doi":"10.30536/J.JTD.2018.V16.A2871","DOIUrl":"https://doi.org/10.30536/J.JTD.2018.V16.A2871","url":null,"abstract":"Telah dilakukan pengembangan teknik analisis berat molekul rata-rata polimer HTPB (Hydroxy Terminated Polybutadiene) dalam rangka pemilihan metode analisis untuk kontrol kualitas bahan baku propelan. Bahan HTPB diuji menggunakan metode viskosimetri, osmometri, dan kromatografi filtrasi gel (GPC) menggunakan bahan polimer standar polistiren dengan berat molekul 400, 1000, 5000, dan 10.000 gram.mol-1. Bahan yang dianalisis adalah HTPB impor dari China. Hasil penelitian menunjukkan bahwa berat molekul rata-rata HTPB dapat dianalisis dengan baik mengunakan metode viskosimetri, osmometri, dan GPC disesuaikan dengan kondisi operasional. Analisis viskosimetri sangat cepat, mobilitas tinggi, akurasi rendah, dan dapat diperoleh berat molekul rata-rata viskos (Mv), dapat digunakan untuk kontrol kualitas bahan di lapangan. Analisis dengan metode osmometri dapat diperoleh berat molekul rata-rata jumlah (Mn) dengan akurasi tinggi dan mobilitas rendah dan dapat digunakan untuk kontrol kualitas. Analisis dengan metode GPC menghasilkan berat molekul rata-rata jumlah (Mn) dan polidispersitas HTPB, akurasi tinggi, mobilitas rendah, dan dapat digunakan untuk kontrol kualitas dan pengembangan polimer. Tidak terdapat perbedaan signifikan antara berat molekul mutlak dan relatif. Analisis HTPB menunjukkan terjadi penurunan kualitas HTPB dengan terjadinya kenaikan berat molekul setiap waktu. Kualitas HTPB efektif adalah 3 tahun. HTPB perlu dilakukan kontrol kualitas tiap bulan untuk memastikan tidak terjadi kerusakan signifikan atau untuk menyesuaikan formulasi propelan.","PeriodicalId":276153,"journal":{"name":"Jurnal Teknologi Dirgantara","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121944912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of Mobile Ground Control System and GPS Base Auto Tracking Antenna 移动地面控制系统与GPS基地自动跟踪天线的研制

Jurnal Teknologi Dirgantara Pub Date : 2018-09-17 DOI: 10.30536/J.JTD.2018.V16.A2880

H. Y. Irwanto

引用次数: 2

Back Pages JTD Vol 16 No.1 Juni 2018 JTD第16卷第1期2018年6月

Jurnal Teknologi Dirgantara Pub Date : 2018-09-17 DOI: 10.30536/j.jtd.2018.v16.a3018

Redaksi Jurnal

引用次数: 0

Time Optimization for Lossy Decompression of the LISA Sensor Data on LAPAN A3 Satellite Using a Grouping Method of HUFFMAN Code Bit Number 基于HUFFMAN码位分组的LAPAN A3卫星LISA传感器数据有损解压缩时间优化

Jurnal Teknologi Dirgantara Pub Date : 2018-09-17 DOI: 10.30536/J.JTD.2018.V16.A2960

Suhermanto M.T

{"title":"Time Optimization for Lossy Decompression of the LISA Sensor Data on LAPAN A3 Satellite Using a Grouping Method of HUFFMAN Code Bit Number","authors":"Suhermanto M.T","doi":"10.30536/J.JTD.2018.V16.A2960","DOIUrl":"https://doi.org/10.30536/J.JTD.2018.V16.A2960","url":null,"abstract":"The LAPAN-A3 satellite provides compressed multispectral data from LISA sensor using real-time lossy compression. The compression of the multispectral data of radiometric resolution 12bit/pixel is built from the Fourier transform and the use of Huffman decoder 514 binary length code. A problem arised in the data extraction process, that decompression performance is very slow because the search method of code value in Hufman table was done sequentially from one bit to the next bit in one block of data along 4000 pixels. The data extraction time for one scene in 12 minutes acquisition duration (one full path) takes up to 20 hours. This paper proposes a method of improving the LISA real-time lossy data decompression algorithm using the grouping method of bit code on the Huffman decoding algorithm and using pointer for reading data in the buffer memory. Using this method, the searching process of bit code for all characters in the Huffman decoder algorithm is done regularly, so the search processing time is significantly reduced. The performance test used 6 data samples. The result showed that extraction time has an average of 14 times faster. The lossy compression ratio is still in accordance with the design specification of LISA sensor that is less than 4 times and the appearance of the special character is very small i.e. less than 0.5%.","PeriodicalId":276153,"journal":{"name":"Jurnal Teknologi Dirgantara","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122045869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

ANALISIS KINERJA ENJIN ROKET CAIR ECX1000H2-3

Jurnal Teknologi Dirgantara Pub Date : 2018-09-17 DOI: 10.30536/J.JTD.2018.V16.A2973

Arif Nur Hakim

引用次数: 1

Sun Sensor dan Magnetometer Sebagai Sensor Penentu Sikap Satelit Inklinasi Rendah LAPAN-A2

Jurnal Teknologi Dirgantara Pub Date : 2018-09-17 DOI: 10.30536/J.JTD.2018.V0.A2950

Satriyan Utama, Patria Rachman Hakim

引用次数: 4

RX-320 Rocket Static Pressure Combustion Chamber Prediction and Validation by Using Invers Method RX-320火箭静压燃烧室的反演预测与验证

Jurnal Teknologi Dirgantara Pub Date : 2018-09-17 DOI: 10.30536/J.JTD.2018.V16.A2866

S. Sofyan, Vicky Wuwung

{"title":"RX-320 Rocket Static Pressure Combustion Chamber Prediction and Validation by Using Invers Method","authors":"S. Sofyan, Vicky Wuwung","doi":"10.30536/J.JTD.2018.V16.A2866","DOIUrl":"https://doi.org/10.30536/J.JTD.2018.V16.A2866","url":null,"abstract":"The static pressure data of the combustion chamber which can generally be obtained by performing direct measurements when static test is performed on the rocket is an important parameter in predicting the thrust and design of the combustion chamber of the rocket. However, there is a model rocket for flight test that is used in static test. Thus, there is no mounting for static pressure sensors (for measurement) are made. To solve the problem, then the inverse method is used as an iterative solution for the basic equations of the rocket thrust force in the nozzle by guessing the value of the static pressure of the combustion chamber firstly and calculate the iteration by including the value of the rocket thrust from static test data and the efficiency variation of the nozzle. The results of this calculation are then validated by using a 3D-CFD numerical simulation to obtain a more detailed comparison on the nozzle. In this research RX 320 LAPAN rocket nozzle with focus on maximum static thrust data of static test results is used. The 3-D numerical simulation is performed using Numeca CFD software, with k-extended wall extended turbulent model, numerical multigrid level 3 scheme, center based, and convergence criteria of 10 e-05. The result of calculation by inverse method and its comparison with numerical simulation shows that the smallest difference of the combustion chamber static pressure between inverse method and numerical simulation is 0.017%, that is achieved at 92% nozzle efficiency. At this point, the static pressure of the combustion chamber is 57.94 bar. From this point of view, the results of this comparison indicate that the inverse method can be used accurately for static pressure of the combustion chamber prediction, if the nozzle efficiency is given correctly. Furthermore, with given static pressure of the combustion chamber correctly, it will be very helpful in the design of the more optimum combustion chamber.","PeriodicalId":276153,"journal":{"name":"Jurnal Teknologi Dirgantara","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116621614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2