Proksima

Kinematic Analysis of the Draglink Mechanism Using the Newton Rhapson Iteration Method

Nazaruddin Nazaruddin, Fablil Huda, Ryan Syuhada — Thu, 29 Feb 2024 00:00:00 +0000

Position, speed, and acceleration analysis are all included in kinematic analysis. Vectors of location, velocity, and acceleration can be expressed analytically in the form of complex numbers using the Newton Rhapson Iteration Method. The location vector of the point to be investigated must be found first, and then the acceleration and velocity vectors must be found by differentiating against time. This study analyzes the relationship between the θ1 value and the θ2, θ3, θ4, θ5, and x2 values in a drag-link mechanism. The Newton-Raphson iteration method is employed for kinematic analysis to solve nonlinear equations. In this research, the analysis results indicate a correlation between the θ1 value and the θ2, θ3, θ4, θ5, and x2 values. As θ1 increases, the θ2, θ3, θ4, and θ5 values also proportionally increase. The x2 value is also influenced by changes in θ1. This study combines the Newton-Raphson iteration method with graphical analysis using CAD software. The conclusion of this research highlights a significant relationship between the θ1 value and the θ2, θ3, θ4, θ5, and x2 values in the drag-link mechanism. The analysis provides valuable insights for modeling, designing, or controlling systems involving these variables.

An Investigation of Thrust Bearing Temperature Rise in Unit 2 Koto Panjang Hydropower Plant

Muhammad Fadhlurrahman ‘Arif Muttaqien, Frans Boyce Patiharauw, Dedy Masnur — Thu, 29 Feb 2024 00:00:00 +0000

Turbines and generators are the main components of hydropower plants that are supported by several bearings, one of them is the thrust bearing. Thrust bearing unit 2 experienced a temperature rise that exceeded the alarm limit (77℃). This study aims to investigate the temperature rise and provide a solution. The investigation was conducted by visual observation; collating temperature and oil flow rate data; and reviewing the hydropower design. The results showed that the temperature rise was attributed to air (oil vapor) trapped in the lubricant circulation system. Therefore, the lubricant circulation system was modified by adding a pipe to the stayring as an outlet for trapped lubricant vapor. This measure effectively normalized the thrust-bearing temperature and flow rate.

Bearing Failure Analysis in Centrifugal Pump at PT. XYZ

Erwin Fradana, Ridwan Abdurrahman — Thu, 29 Feb 2024 00:00:00 +0000

This study conducts a comprehensive analysis of bearing failures in centrifugal pumps, aiming to find bearing life & the cause of difference in field data. Through meticulous examination of failed bearings, the research identifies root causes, including factors such as misalignment, inadequate lubrication, and excessive loads. The investigation involves a series of systematic steps to identify, evaluate, and understand the causes and impacts of damage that occurs. First, a visual survey of the centrifugal pump is carried out to look for physical signs that indicate damage to the bearing. This involves checking general conditions, such as wear, cracks, or leaks. The findings contribute to the nominal bearing life is 26.631,8 hours or about 3 years of use & the difference in life calculations between theoretical calculations and data found in the field is generally caused by high temperatures and vibrations in the bearing.

Energy Management and Audit of the Lighting and Air Conditioning System at the Teratak Buluh Grand Mosque, Pekanbaru City

Fikri Fahlevi Nasution, Nur Khotimah, Awaludin Martin, Tikkos Sihombing — Thu, 29 Feb 2024 00:00:00 +0000

Energy management and audits are important steps in improving a building's energy efficiency. Mosques, as centers of religious and social activities, often have significant energy requirements. The research methods used include field observations at the Teratak Buluh Grand Mosque, measuring energy consumption, and recommendations for saving energy use. The research results show that mosques have the potential for significant energy savings with recommendations for energy conservation opportunities that can be implemented by reducing the number of lamps used and the number of air conditioners. Previously, electrical power consumption at the Teratak Buluh Grand Mosque was 74,480.40 kWh/year with electricity costs reaching IDR 68,894,370/year. Meanwhile, electrical power usage after energy conservation opportunities (ECO) is 41,918.40 kWh/year with electricity costs of IDR 38,774,520/year, with an energy consumption intensity (IKE) value at the mosque of 13.49 kWh/m²/ month. Based on Permen No. 13 Tahun 2012 Tentang Penghematan Energi Listrik, this value is included in the fairly efficient energy consumption category.

Effect of Slip-to-Roll Ratio on Wear Rate and Friction Coefficient of Palm Oil-Base Biolubricant with Additive of Graphene

Dedi Rosa Putra Cupu, Aryo Kuncoro Adji, Kaspul Anuar, Efi Afrizal, Nazaruddin — Thu, 29 Feb 2024 00:00:00 +0000

During machine is in operation, some machine elements will contact causing a rubbing between the elements. When the contacting parts is subjected to a mechanical force, a phenomenon called friction and wear arise. Contacting of both elements with the same tangential velocity refers to pure rolling contact which means there is no slip between them. Lubricants are usually used between the contacting materials to reduce friction and wear. Nowadays, commercial lubricants are from mineral oils which are dangerous to human beings and the environment. An alternative to reduce the use of mineral oil is by using vegetable-based oils. This research was experimentally conducted to study the effect of slip-to-roll ratio (SRR) on the wear rate and coefficient of friction for biolubricant made of palm oil and graphene nanolayers as additives using disc-on-disc tribometer. The experimental results show that the value of the wear rate and friction coefficient is directly proportional to the value of the slip ratio on the two discs. This means that the greater the slip ratio that occurs, the greater the value of the wear rate and friction coefficient produced.

Aligment Feed Water Pump menggunakan Metode Laser PT. Riau Andalan Pulp and Paper Pelalawan, Riau

Alfito Dinova, Dodi Sofyan Arief, M Dalil, Abdul Khair Junaidi — Thu, 29 Feb 2024 00:00:00 +0000

Alignment is a process that aligns two shaft axes that are not straight to centric (between the driving shaft and the driving shaft axis). Correct alignment is needed so that checks are completed on the correct clutch, so that offset misalignment and angle misalignment do not occur again which results in damage to machine components which is detrimental to the industry. Misalignment is a condition where there is a deviation at the point between two connected axes (two axes are not located on the same axis). If misalignment occurs in the clutch, it will accelerate damage to the clutch, bearings and other components, and cause excessive vibration. The purpose of writing this report is to find out the basic theory of alignment and find out the alignment method using the laser method.