Muhsin J. Jweeg

Al-Farahidi University

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Systematic Design and Simulation of a Home Stand-Alone PV System for a Located in Baghdad City

Studies in systems, decision and control (2024)

M. N. Mohammed Alshekhly Hakim S. Sultan Aljibori Muhsin J. Jweeg Oday I. Abdullah M. Alfiras

10.1007/978-3-031-62102-4_63

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A Novel Optimization Strategy of Bearing Geometry with a Length to Diameter Ratio of 1.25 under Severe Operating Conditions Using Taguchi Method

Designs (2023)

Hazim U. Jamali M. N. Mohammed Hakim S. Sultan Aljibori Muhsin J. Jweeg Oday I. Abdullah

Robust and well-designed rotor-bearing systems ensure safe operation and a high level of reliability under severe operating conditions. A deviation in the shaft axis with respect to the bearing longitudinal axis represents one of the most unavoidable problems in bearing systems. This deviation results from installation errors, manufacturing errors, shaft deformation under heavy loads, bearing wear, and many other causes. Each of these deviation sources has its negative consequences on the designed characteristics of the system. This work deals with the geometrical design of a journal bearing using three forms of profiles (linear (n=1), quadratic n=2 and cubic (n=3) profiles) in order to enhance bearing performance despite the presence of the inevitable shaft deviation. In addition, a wide range of bearing profile parameters are considered in the analysis to optimize the bearing profile based on the use of the Taguchi method. A general form of shaft deviation is considered to account for both horizontal and vertical deviations. A numerical solution is obtained using the finite difference method. The results show that all three suggested forms of bearing profiles elevate the film thickness significantly and also reduce the friction coefficient, but with different effects on the maximum pressure values. The Taguchi method illustrates that the optimal geometrical design parameters are the quadratic profile and the modification of one-fifth of the bearing width from both sides at a height of just less than half the radial clearance (0.4 C) at the bearing edges. These values give the best combination of the considered main bearing characteristics: the minimum film thickness, coefficient of friction, and maximum pressure. The results show that the minimum film thickness is increased by 184%, the maximum pressure is reduced by 15.1% and the friction coefficient is decreased by 6.4% due to the use of the suggested design. The outcome of this work represents an important enhancement step for the rotor bearing performance to work safely with high reliability under severe shaft deviation levels. This can be implied at the design stage of the bearing, which requires prior knowledge about the operating conditions in order to have better estimation for the levels of shaft deviation.

10.3390/designs7060121

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Modeling of electrocatalytic hydrogen evolution via high voltage alkaline electrolyzer with different nano-electrocatalysts

International Journal of Hydrogen Energy (2023)

Farkad A. Lattieff Muhsin J. Jweeg Hasan Sh. Majdi Fadhil Abbas M. Al-Qrimli

Alkaline water electrolysis

Electrolysis of water

Thermal energy

Chemical energy

High-pressure electrolysis

10.1016/j.ijhydene.2023.08.062

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An experimental comparative study between polypropylene and laminated lower limb prosthetic socket

DOAJ (DOAJ: Directory of Open Access Journals) (2007)

Muhsin J. Jweeg Samira K. Radhi Haider F. Neama

Polypropylene

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Experimental Investigation of Thermal Effect on the Frictional Characteristics of HCC Friction Clutch Material

Tribology in Industry (2024)

Nazar Kais AL-Karkhi Nadica Stojanović Salah Al-Zubaidi Muhsin J. Jweeg Hakim S. Sultan Aljibori

Increasing temperature due to frictional heat from sliding between contacting surfaces leads to increased wear and friction. Therefore, the researchers continue investigations to find the most suitable friction materials with good mechanical and thermal properties for frictional facings of clutch performance under this condition. In this research paper, the behavior and performance of the friction material HCC was studied under different normal load conditions (125, 175, 225, and 275 N) and different working environment temperatures (300 K and 390 K), where the rotation speed was 300 rpm. The results of the coefficient of friction and friction forces variation under different working conditions were analyzed and discussed in detail. XTM 500 tribometer test rig was used to perform the required tests, and the samples were made of the HCC friction material. The obtained results proved that the ambient temperature of the friction system has a significant negative effect on both the coefficient of friction and the force of friction. So, when the friction system's ambient temperature increases, the magnitude of the friction coefficient will decrease, and, thus, the transmitted torque will reduce too.

10.24874/ti.1465.03.23.12

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Analytical and Numerical Investigations of Mechanical Vibration in the Vertical Direction of a Human Body in a Driving Vehicle using Biomechanical Vibration Model

Pertanika journal of science & technology (2021)

Maher A.R. Sadiq Al-Baghdadi Muhsin J. Jweeg Muhannad Al‐Waily

The main reason that affects the discomfort in a driving vehicle is the vibration response. The human body vibration leads to many malfunctions in both comfort and performance in human health. As a result, the human body’s simulation in sitting posture in the driving vehicle has a strategic relationship for all Tires and vehicles manufacturers. The digital process simulation of the human body seat vehicle vibration shows two significant advantages. The first advantage is the prevention of the high-cost modifications in the construction stage of the vehicle, while the second one describes the stability test during the undesirable vibrations. This study modelled the human body’s dynamic characterisations, natural frequency, and mechanical response when seated in the driving vehicle with vibration transmissibility in the vertical direction have been using the biomechanical vibration model. The vertical vibrations and the transmissibility of the human body dynamic response are presented in detail. Exciting results have been obtained, and they are significant for human health, which relates to sitting posture in the driving vehicle. It can assist in understanding the influences of low-frequency vibration on human health, comfort, and performance, and therefore it could be applied for ride comfort evaluation. An analytical solution to derive the general equations of motion for the human system was developed. Then, using the vibration analysis technique and the corresponding equations, the accurate dynamic response of the selected mode is identified. Furthermore, the mathematical modelling for free vibration using the finite element analysis has been performed to determine the appropriate values and set its description. Then, the comparison results of the two techniques have been carried out.

Transmissibility (structural dynamics)

Whole body vibration

Sitting

Natural frequency

10.47836/pjst.29.4.30

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Citations (10)

Prediction of the sheet thickness effect on the formability of brass CuZn37 in single point incremental forming using Hooputra ductile damage model

Advances in Science and Technology – Research Journal (2024)

Marwa K. Qate’a Adnan I. Mohammed Muhsin J. Jweeg

Brass

Incremental sheet forming

10.12913/22998624/194886

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DOAJ (DOAJ: Directory of Open Access Journals) (2016)

Husam A. Kareem Muhsin J. Jweeg Shaker S. Hassan

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Characterization of Natural Rubber (NR), Polybutadiene Rubber (BR) and Styrene-Butadiene Rubber (SBR) Blends Cured in a Vulcanization System

Materials science forum (2021)

Muhsin J. Jweeg Zaid Ghalib Abdul-kadhim Al-Jlaihawi

In this work, the mechanical properties of three types of dough rubber NR, NR/BR, and NR/SBR have been investigated using five percentages of materials fill (30, 40, 50, 60, and 70) pphr. Carbon black was used as a filler material. The tensile test was achieved with 300% elongation and strain rates of (100, 200, 300, 400, and 500) mm/min. The tensile strength results indicate that the maximum value of tensile strength for NR Dough carbon black 60 pphr reaches 23.2 MPa; the maximum tensile strain of NR dough (carbon black 50 pphr) reaches 805.5%, and the modulus of elasticity with carbon black 70 pphr reaches 4.3 MPa. It was found that the compression strength decreases with increasing the carbon black, and the maximum value of compression set at NR dough (carbon black 30 pphr) reaches 29.3%. Fatigue crack growth was achieved according to ASTM D 813 for rubber testing. The minimum value of fatigue strength dough (carbon black 70 pphr) reaches 68 (IRHD). For NR dough (carbon black 30,40,50 pphr) reaches 3.5 mm at the number of cycles 15000 cycle. Finally, the maximum hardness of NR.

Styrene-butadiene

Compression set

Elongation

10.4028/www.scientific.net/msf.1039.51

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Analysis, Design And Manufacturing Of Ankle Foot Orthoses

College and University Journal (2016)

Muhsin J. Jweeg AyadMuradTakhakh

Foot (prosody)

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Citations (1)