scholarly journals Karakteristik Koefisien Serap Suara Material Concrete Foam Dicampur Serat Tandan Kosong Kelapa Sawit (TKKS) dengan Metode Impedance Tube

2020 ◽  
Vol 4 (1) ◽  
pp. 85-93
Author(s):  
Muhammad Yusuf Rahmansyah Siahaan ◽  
Darianto Darianto
Keyword(s):  
Impedance Tube ◽  
Horizontal Shaft

Perkembangan teknologi di dunia pada saat ini sangat cepat pertumbuhannya, hal ini berbanding lurus terhadap perkembangan peralatan transportasi, industri, informasi, komunikasi maupun hiburan yang menimbulkan kebisingan sehingga mengganggu aktivitas sehari-hari, kenyamanan lingkungan dan kesehatan pada manusia. Suara menjadi bagian dalam kehidupan sehari-hari yang kita kurang sadari fungsi dan eksistensinya. Energi suara datang pada suatu bahan akan dirubah menjadi energi getar (vibrasi) atau energi panas. Bahan yang mampu menyerap suara pada umumnya mempunyai struktur (1) berpori atau (2) berserat. Penelitian ini bertujuan untuk mendapatkan karakteristik serap suara material akustik menggunakan concrete foam dicampur dengan serat tandan kosong kelapa sawit (TKKS). Concrete foam dibuat dengan cara pencampuran bahan semen, pasir, serat TKKS, air, dan foam agent pada alat horizontal shaft mixer kemudian dituangkan pada cetakan. Pembuatan spesimen menggunakan teknik penuangan/pengecoran ke dalam cetakan plat besi dengan proses perendaman selama 7 hari dan proses pengeringan selama 21 hari. Spesimen material concrete foam dan mortar dilakukan pengujian serap suara dengan metode impedance tube. Berdasarkan pengujian impedance tube sesuai dengan ISO 10534-2:1998 bentuk spesimen adalah silinder ukuran Ø112×10mm, Ø112×30mm, dan Ø112×50mm. Pengujian material concrete foam diperkuat serat TKKS sebesar 4% dengan bentuk silinder ukuran Ø112×10mm diperoleh nilai koefisien serap suara terbaik pada daerah frekuensi menengah 500Hz–2000Hz yaitu 0,958 pada frekuensi 1000Hz, material ini menunjukkan lebih mampu melakukan penyerapan terhadap energi suara yang datang pada permukaan material dibandingkan material mortar memiliki nilai koefisien serap suara terbaik pada daerah frekuensi rendah 0Hz–500Hz yaitu 0,818 pada frekuensi 125Hz dengan bentuk silinder ukuran Ø112×30mm.

scholarly journals On the Vibrations of Horizontal Shaft Supported in Oil Lubricated Journal Bearings

1968 ◽  
Vol 11 (47) ◽  
pp. 813-824 ◽  
Author(s):  
Kyosuke ONO ◽  
Akiyoshi TAMURA
Keyword(s):  
Journal Bearings ◽  
Horizontal Shaft

scholarly journals Emergency Gate Vibration of the Pipe-Turbine Model

2000 ◽  
Vol 7 (1) ◽  
pp. 3-13 ◽  
Author(s):  
Andrej Predin ◽  
Roman Klasinc
Keyword(s):  
Data Transfer ◽  
Guide Vane ◽  
Natural Vibrations ◽  
Vibration Behavior ◽  
Kaplan Turbine ◽  
Gate Opening ◽  
Horizontal Shaft ◽  
Dynamic Similitude ◽  
The Moment ◽  
The Time Domain

The vibration behavior of an emergency gate situated on a horizontal-shaft Kaplan turbine is studied. The analysis and transfer of the dynamic movements of the gate are quite complex. In particular the behavior is examined of the emergency gate for the case when the power unit is disconnected from the system or there is a breakdown of the guide vane system at the moment when the maximal head and capacity are achieved. Experimental-numerical methods both in the time domain and in the frequency domain are employed. Natural vibrations characterize a first zone, corresponding to relatively small gate openings. As the gate opening increases, the vibration behavior of the gate becomes increasingly dependent on the swirl pulsations in the draft tube of the turbine. Finally, the data transfer from the model to the prototype by use of the dynamic similitude law is discussed.

scholarly journals INFLUENCE OF A NUMBER OF IMPACTS OF LOW-SPEED MIXER BLADES ON CONCRETE QUALITY BEING PREPARED

2019 ◽  
Vol 51 (3) ◽  
pp. 92-99
Author(s):  
M.V. Borisova ◽  
◽  
A.Yu. Titov ◽  
V.V. Novikov ◽  
V.V. Konovalov ◽  
...  
Keyword(s):  
Literature Review ◽  
Power Function ◽  
Mixing Process ◽  
Slow Speed ◽  
Horizontal Shaft ◽  
Concrete Quality ◽  
Blade Mixer ◽  
Working Bodies ◽  
Made In ◽  
State Agricultural Academy

The paper presents purpose equations describing the uneven mixing depending on the number of the mixer blade impacts per unit of concrete weight as well as the weight of the mixture that have an impact on blades of the slow-speed mixer. Based on the literature review and analysis of the mixing process conducted in the Samara State Agricultural Academy, the design of the blade mixer was developed. The mixer consists of a body where there is a horizontal shaft with working bodies, made in the form of radial blades of helical shape. There are received equations that allow determining the concrete uniformity depending on a number of the impacts of the mixer blades per unit of the concrete weight as well as on the concrete weight that act on the blades of the slow-speed mixer. The power function is adequately described by the experimental results of 98 % confidence probability. In the studied areas of changes in independent factors rational values of the number of impacts per unit of the concrete weight is not less than 800 PCs/kg, as well as the concrete weight having impact on the blade of the slow-speed mixer is not more than 0,001 kg/PC.

scholarly journals Concept Development of a Multi Level Horizontal Shaft Impact Crusher

2016 ◽  
Vol 2 (1) ◽  
Author(s):  
Nimisha Dave ◽  
Abhishek Jain
Keyword(s):  
Concept Development ◽  
The Body ◽  
Jaw Crusher ◽  
Yield Parameters ◽  
Horizontal Shaft ◽  
Execution Model ◽  
Cone Crusher ◽  
Real Size ◽  
Multi Level ◽  
The Ideal

Crushers are one of the real size lessening gear that is utilized as a part of metallurgical, mechanical, and other comparative businesses. They exist in different sizes and limits which extend from 0.1 ton/hr. to 50 ton/hr. They can be ordered taking into account the extent to which they can piece the beginning material and the way they apply strengths. In view of the system utilized crushers are fundamentally of three sorts to be specific Cone crusher, Jaw crusher and Impact crusher. Sway crushers include the utilization of effect instead of weight to pulverize materials. Here the material is held inside of an enclosure, with openings of the coveted size at the base, end or at sides to permit squashed material to escape through them. This sort of crusher is for the most part utilized with delicate materials such as coal, seeds or delicate metallic minerals. The instrument connected here is of Impact stacking where the season of use of power is not exactly the regular recurrence of vibration of the body. Since the sledges/blow bars are pivoting at a fast, the ideal opportunity for which the particles interact with the mallets is little, thus here effect stacking is connected. The pole is thought to be subjected to torsion and bowing. The pounding screen is additionally intended for ideal yield from the crusher An execution model is likewise considered for the level shaft sway crusher to discover the connection between the food, the crusher parameters and the yield parameters.

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