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Jumiadi
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Automotive Engineering Control & Systems Engineering Economics, Econometrics & Finance Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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ANALISIS HUBUNGAN PUTARAN KATUP DENGAN KONSTANTA PEGAS DENGAN MENGGUNAKAN PEREDAMAN Tsamroh, Dewi 'Izzatus; Jumiadi; David Ross
RING ME Vol 3 No 1 (2023): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v3i1.20429

Abstract

One of the problems of a machine is the vibration generated by the machine itself. Vibration is very influential on the structure and construction of the machine. One of the issues that is very important to note in these plans is the calculation of the deflection/deflection of the elements when subjected to a load. This is very important especially in terms of strength (strength) and stiffness (stiffness), where a horizontal bar that is loaded laterally will experience deflection. The deflection that occurs in elements that experience loading must be within an allowable limit. Based on the actual and theoretical research results for the Simple vibration apparatus, load and valve variations are directly proportional to the damping constant. The greater the load and valve rotation, the greater the damping constant. The beam deflection apparatus has several results, namely the load variation is directly proportional to the static deflection value. The greater the load, the greater the static deflection. Variation of distance (intermediate load point) is directly proportional to the static deflection value. The greater the distance, the greater the static deflection. Variation of distance (end load point) is directly proportional to the static deflection value. The greater the distance, the greater the static deflection. Thickness variation is inversely proportional to the static deflection value. The greater the thickness value, the smaller the static deflection. The width variation is inversely proportional to the static deflection value. The greater the width value, the smaller the static deflection.
ANALISIS HUBUNGAN ANTARA KONSTANTA PEGAS DAN DEFLEKSI STATIS DENGAN PEMBEBANAN BERBEDA TANPA PEREDAM Jumiadi; Dewi Izzatus Tsamroh; Ike Widyastuti; Arif Budiono
RING ME Vol 3 No 1 (2023): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v3i1.20430

Abstract

One of the most frequently encountered motions in nature is oscillatory motion (vibration). A particle oscillates when it moves periodically about an equilibrium position. A load attached to a spring that is stretched once is released, then it begins to oscillate. Basically, vibration is a technical system that contains mass and elasticity that is able to move relatively or can be said to be a movement that repeats itself at certain time intervals. Increasing technological developments show that the tools that have to do with vibrations are very diverse. One of them is the vibration that utilizes the Simple Vibration Apparatus. In the free vibration frequency experiment, from the test results without a damper with a mass of 0.47kN/m; 1.22kN/m and 3.3kN/m it can be seen that there is a big difference between the theoretical frequency value and the actual frequency value. The results of the theoretical deflection from experiments 1 - 5 have increased constantly. The greater the loading, the greater the deflection.
ANALISIS PENGARUH KOMPOSISI GARAM TERHADAP LAJU KOROSI PADA BAJA HSS Jago, Thomas Apriliano; Tsamroh, Dewi Izzatus; Jumiadi; Setyawan, Pungky Eka
RING ME Vol 4 No 1 (2024): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v4i1.21748

Abstract

Corrosion, which is the process of metal damage due to environmental factors such as microbes, pH, humidity, temperature, and contaminants from the metal itself, has very destructive properties for metal. Before implementing appropriate control methods, testing is often necessary to determine the appropriate approach. One useful testing method is the spray chamber test, the working principle of which involves creating a mist of corrosive media on the test sample. In this research, HSS steel was used as a test sample. Using a spray chamber test, salt water of various compositions is poured into a container to produce mist, which is produced by a mist maker. The mist is then pushed upwards by a small fan with a current of 12 v and sprayed onto the test specimen over an 8 day period. This tool is useful for determining the corrosion rate of the metal being tested, allowing the determination of how quickly the metal is subject to corrosion, which is useful in selecting materials for construction that are appropriate to environmental conditions. Based on the test results, it can be concluded that the corrosion rate for HSS steel is 0.070 MPY with a salt composition of 500 grams, 0.072 MPY with a salt composition of 750 grams, 0.142 MPY with a salt composition of 1.250 grams, and 0.162 MPY with a salt composition of 1.750 grams.
Effect of Reinforcement Type Variation on Mechanical Properties of Epoxy Composite Zen, Ahmad Norca Kurnia; Jumiadi; Widiastuti, Ike
TRANSMISI Vol. 21 No. 1 (2025): March (2025)
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v21i1.14737

Abstract

This research aims to examine the mechanical characteristics of polymer matrix composites reinforced with filler from various types of wood powder. The types of wood used are mahogany, sengon, and Dutch teak. The composites were fabricated using the hand lay-up method with a composition of 90% resin and 10% wood powder. A specimen without the addition of wood powder was also prepared for comparison. In this research, the mechanical properties tested were bending strength and impact resistance (ASTM D5687 standards). The bending test was performed using the 3-point bending method with a Universal Test Machine, while the impact test was conducted using the Charpy Test method. The bending test results indicated that the composite reinforced with mahogany achieved the highest bending stress value of 136.02 N/mm², an increase of 20% compared to the composite without wood powder reinforcement. The impact test results showed no significant changes in impact resistance values, with an F-value of less than 5% in the ANOVA analysis.
Pengaruh Profitabilitas, Likuiditas, dan Pertumbuhan Penjualan terhadap Kebijakan Hutang: Studi Empiris Perusahaan Properti Di BEI Tahun 2021-2024 Christy Amelia Rotua Sibarani; Jumiadi
Jurnal Ilmu Ekonomi dan Bisnis Vol 4 No 1 (2026): April, Jurnal Ilmu Ekonomi dan Bisnis
Publisher : Perkumpulan Konsultan Manajemen Pendidikan Indonesia (PKMPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65510/jieb.v4i1.287

Abstract

The problem in this study is related to significant fluctuations in the level of debt utilization by property and real estate companies in Indonesia during the pandemic and post-pandemic periods. This study aims to examine the effect of profitability, liquidity, and sales growth on debt policy. This research employed a quantitative approach using secondary data obtained from the companies’ annual financial statements. The population consisted of property and real estate companies listed on the Indonesia Stock Exchange for the period 2021–2024. The sampling technique applied was purposive sampling, resulting in a total sample of 30 companies. The analytical methods used in this study were descriptive statistical analysis and panel data regression analysis, with the assistance of EViews 12 software. The results of this study show that profitability has no effect on debt policy, liquidity has a negative and significant effect on debt policy, and sales growth has no effect on debt policy. The findings also indicate that simultaneously, profitability, liquidity, and sales growth affect debt policy.
Co-Authors Arif Budiono Christy Amelia Rotua Sibarani David Ross Dewi Izzatus Tsamroh Ike Widyastuti Jago, Thomas Apriliano Pungky Eka Setyawan Widiastuti, Ike Zen, Ahmad Norca Kurnia