Ahmad Humaizi Hilmi
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Ahmad Humaizi Hilmi
Official Name
Ahmad Humaizi, Hilmi
Alternative Name
Hilmi, Ahmad Humaizi
Hilmi, A.
Humaizi, Ahmad
Hilmi, A. H
Main Affiliation
Scopus Author ID
57193311438
Researcher ID
W-1988-2019

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  • Publication
    Industry 4.0 challenges and benefits in Malaysia's manufacturing firms: A review
    ( 2024-03-07)
    Arumugam T.
    ;
    Tan Chan Sin
    ;
    Mohammad Fadzli Ramli
    ;
    Ahmad Humaizi Hilmi
    ;
    Rosmaini Ahmad
    ;
    Azmi H.
    Malaysia is now ready to adopt Industry 4.0 as a vital tool for transitioning to a new industry. The major focus of this article is on Industry 4.0's challenges and benefits. Inadequate time and effort, higher investment, lack of expertise and knowledge, and lack of internet coverage and IT facilities are some of the challenges associated with adopting Industry 4.0. Many other benefits of Industry 4.0 implementation include higher productivity, increased competitiveness, increased opportunities for collaborative working and knowledge sharing, cost reduction, flexibility and agility, and improved customer experience. As a result, this article contributes to a more realistic knowledge of Industry 4.0. As a final note, this paper offers some directions for firms wishing to implement Industry 4.0 with great success.
  • Publication
    Properties and behavior of geopolymer concrete subjected to explosive air blast loading: a review
    ( 2017)
    Nurul Aida Mohd Mortar
    ;
    Kamarudin Hussin
    ;
    Rafiza Abdul Razak
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Ahmad Humaizi Hilmi
    ;
    Andrei Victor Sandu
    The severe damage to civilian buildings, public area, jet aircraft impact and defense target under explosive blast loading can cause a huge property loss. Most of researcher discusses the topics on design the concrete material model to sustain againts the explosive detonation. The implementation of modern reinforcement steels and fibres in ordinary Portland cement (OPC) concrete matrix can reduce the extreme loading effects. However, most researchers have proved that geopolymer concrete (GPC) has better mechanical properties towards high performance concrete, compared to OPC. GPC has the high early compressive strength and high ability to resist the thermal energy from explosive detonation. In addition, OPC production is less environmental friendly than geopolymer cement. Geopolymer used can lead to environmental protection besides being improved in mechanical properties. Thus, this paper highlighted on an experimental, numerical and the analytical studies cause of the explosive detonation impact to concrete structures.
  • Publication
    Numerical and Experimental Investigation on Aluminium 6061 Solid Cylindrical Bar Subjected to Close-in Blast Loading
    ( 2024-01-01)
    Mohd Syedi Imran Mohd Dawi
    ;
    Ahmad Humaizi Hilmi
    ;
    Muhamad Saifuldin Abdul Manan
    ;
    Zaidi A.M.A.
    ;
    Mohd Sabri Hussin
    ;
    Chong P.L.
    Compaction force generated by blasting load requires strong material such as steel to act as a plunger to spread the force evenly. The problem with this method is retaining the plunger's original dimension from intolerable deformation. This paper uses ABAQUS software to study the ability to predict the response of solid cylindrical aluminium bars (6061) subjected to different close-in blast loads. The solid cylindrical aluminium bars treated as a plunger were evaluated numerically using a combination of the finite element method (FEM) and smoothed particle hydrodynamic (SPH) methods. The plunger was simulated using the Johnson-Cook (J.C.) model, and Jones-Wilkins-Lee (JWL) equation parameters modelled the explosive. Field tests were conducted by detonating explosives of two different weights, which are 100g and 250g, in the designated blast area. Both data and observation were compared and analysed regarding deformation behaviour in term of dimension difference and fracture. Based on the graph of the deformation dimension versus the plunger length, the deformation trend shows a very close relation between numerical and experimental data with a percentage error of less than 4%. The fracture mode generated using FEM is comparable to the actual specimen. This fracture mode can be described as similar to the behaviour of the specimen obtained using the Taylor impact test. Thus, it can be concluded that the numerical analysis performed for this study is consistent with the actual results.
  • Publication
    Current issues related to anthropometry in engineering
    ( 2022)
    Ahmad Humaizi Hilmi
    ;
    Asna Rasyidah Abdul Hamid
    Anthropos and Metrikos both mean "human" in Greek, which is where the term anthropometry comes from. Anthropometry is employed in a variety of fields, including apparel and textile design. For anthropometric evaluations, a current, thorough, and community-specific anthropometric normative-reference standard is necessary. In health care, ergonomic design is utilised to reduce pain and illness. Misalignments between humans and machines result in pain, accidents, biomechanical stress, tiredness, and musculoskeletal injuries. Designing for the anthropometrics of end users improves long-term viability. The human body comes in a wide range of sizes and shapes. Manual measurement and 3D scanning procedures, on the other hand, are inefficient and expensive, making precise body measurements difficult. This is especially true for head-worn medical devices. Manual measurement and 3D scanning are inefficient and expensive, making precise body measurements difficult. Grip strength and force were determined using hand measurements. Anthropometric parameter estimate is more precise when a 3D model is used to boost pinnae features. While numerous anatomical features have been gathered to aid in the ergonomic design of wearable devices, there is still a lot more work to be done. In three dimensions, the segment masses and torso Centre of Mass (COM) may be calculated. Researchers tracking mobility would benefit greatly from the ability to locate the body COM using a weighted sum of segment masses. Design features such as comfort and usefulness are crucial. Ergonomic characteristics like taller seats with front slopes and saddle chairs encourage good posture, movement, and alternation. In the creation of wearable technologies, using outdated anthropometric reference standards may be insufficient. This review discuses common issues related to anthropometry in engineering which includes the human body, anthropometric parameters, anthropometric measurements, the force plate method, ergonomic design, and body dimension. The goal is to give a broad overview of the subject.
  • Publication
    Current issues related to biomechanics in engineering
    ( 2022)
    Ahmad Humaizi Hilmi
    ;
    Asna Rasyidah Abdul Hamid
    Motion capture was employed by Eadweard Muybridge and Etienne-Jules Marey. Industry standard for computing joint kinematics is motion capture. Kinematic analysis is a technique used in biomechanics and mechanical engineering to quantify stiff body motion. A joint moment can be computed in one of two ways: bottom-up or top-down. Joint moments measure muscle and joint tension indirectly. Researchers predicted joint moments using kinematic-based characteristics and machine learning outside of the biomechanics lab.Ankle osteoarthritis causes significant biomechanical issues in the foot and lower leg. Patients' 3D multi-segment kinematic foot models were studied. The technique used is Openpose, which recognises the human body from a single photograph.Falling fear is linked to decreased activity, despondency, and anxiety in the elderly. They adopt a hip approach to manage their GRFs and balance. The lateral ankle technique corrects minor foot placement problems by swiftly moving the pressure point. Angular momentum is affected by foot placement and ground reaction forces. Changing the body's centre of mass along a curved trajectory implies large changes in both ground reaction force impulses and ground reaction force.Lens stiffness and a ciliary muscle anterior/inward displacement produce presbyopia. By 55, the majority of folks have lost their ability to accommodate. Cataracts become common around this time, reaching over 70% by 75. The circumferential and meridional stiffnesses rose with anisotropy from pole to equator, but dropped with distance. The Holzapfel model accurately fits the data from inflation and uniaxial mechanical tests.Anatomical motions of the femur during knee flexion were examined. The data revealed morphological and physiological knee kinematic characteristics. The data led to several hypotheses about axial femoral condyle rotation. This review discusses lower limbs, foot positioning, lens capsule, femoral condyle, muscle activation, collagen fibre, knee joint, and walking speed. The purpose is to provide a general overview on the subject matter.
  • Publication
    A review of industry 4.0 development progress in Indonesia
    ( 2024-03-07)
    Mursadi R.A.
    ;
    Tan Chan Sin
    ;
    Ramli M.F.
    ;
    Ahmad Humaizi Hilmi
    ;
    Rosmaini Ahmad
    ;
    Azmi H.
    Rapid advancements in digital technology have resulted in a new industrial revolution phenomenon known as Industry 4.0. This revolution introduces modern technologies that enable the connectivity of all components within industries. This paper reviews the current status and progress in Indonesia heading to Industry 4.0. The Indonesia' government has been launched 'Making Indonesia 4.0's' roadmap in 2018 including the five priority industrial sectors namely food and beverages, chemicals, textile, automotive, and electronics and ten national priorities. Indonesia which is currently only in the stage of entering the industrial era 4.0 with few of challenges and opportunities by following the roadmap of "Making Indonesia 4.0".
  • Publication
    Review on current issues related to work related musculoskeletal disorders
    ( 2022)
    Asna Rasyidah Abdul Hamid
    ;
    Ahmad Humaizi Hilmi
    Work-related musculoskeletal disorders (WMSDs) are one of the most common occupational ailments in recent decades, significantly limiting people's daily lives. Globally, WMSDs are the major cause of employee pain, impairment, absenteeism, reduced productivity, and large financial costs. WRMSDs are illnesses that develop over time because of long-term occupational exposure to varying-intensity loads. WRMSDs are produced by discomfort or injury to the muscles and bones of the upper limbs because of activity. Low-extremity illnesses, like upper-limb diseases, may be just as dangerous, There is a high prevalence of neck and upper extremity problems among computer users. Upper extremities diseases were more common in older personnel. The physiological outcome of prolonged, repetitive, or repeating muscle contractions with insufficient recovery is localised muscular fatigue (WMSDs). Muscle tiredness has a substantial impact on occupational task performance, hence preventing it is crucial. The key challenge in ergonomics is to create work that avoids WMSDs while retaining high levels of output quality and productivity. Uncomfortable postures are commonly recognised as a major contributor of MSD among construction workers. Because of their linearity, ergonomic metrics can be incorporated into assembly line design models. They can also be utilised to take use of efficient solution methods established for optimal line design which are beneficial in the assembly line industry. Real-time risk assessment for work-related musculoskeletal disorders (MSDs) has proven to be challenging to research. Working at a fast speed and performing repetitive activities, as well as maintaining non-neutral body postures, are all physical risk factors for WMSDs. This review discuses common issue related to WMSDs which includes upper extremity, upper limbs, carpal tunnel syndrome, awkward postures, muscle activity, muscle fatigue, assembly line and risk assessment. The aim is to provide an overview of the problems related to the subject matter.
  • Publication
    Simulation Study on Hypervelocity Penetration of Lab Scaled Shape Charge Mechanism
    ( 2022-01-01)
    Kamarudin K.H.
    ;
    Zaidi A.M.A.
    ;
    Ahmad Humaizi Hilmi
    ;
    Abdullah M.F.
    ;
    Nor N.M.
    ;
    Ismail A.
    ;
    Yusof M.A.
    ;
    Rasool Mohideen S.
    Shaped charge (SC) is a mechanism used by defence industries as anti-armored weapon to penetrate armored plates. Numerous studies have been conducted on the shaped charged effects. However, experimental studies are limited due to great safety requirement and limited access to high grade explosive. Due to these limitations, an experimental study on a small-scale shaped charge mechanism (SCM) penetration blast test was conducted against five (5) types of target materials. The experimental data is then verified by simulation to proof that it can be used to predict the SC penetration data. This paper intent to present a comparative study on the effect of shaped charge blast conducted by simulation with the actual experimental results. In order to conduct this study, a 2D AUTODYN software were used to develop the SC blast model against five (5) types of target materials. This study concludes that the 2D AUTODYN simulations results can predict the hypervelocity penetration for all target materials compared to the experimental test with an average difference of 9.1 %.
  • Publication
    Smart wearables in ergonomic applications recent advances and challenges in human-machine integration
    ( 2024)
    Ahmad Humaizi Hilmi
    ;
    Asna Rasyidah Abdul Hamid
    ;
    Wan Abdul Rahman Assyahid Wan Ibrahim
    Smart wearables have become increasingly integral to ergonomic applications, particularly in healthcare, industrial work, and rehabilitation. These technologies offer significant benefits in enhancing human performance, reducing the risk of injury, and improving user comfort. Exoskeletons, one of the key smart wearable technologies, have seen widespread adoption in industrial settings, assisting workers in physically demanding tasks by alleviating muscle strain and promoting ergonomic posture. The application of machine learning within these wearables further enhances their adaptability, allowing for personalized support based on real-time feedback. In healthcare, wearable sensors provide critical insights into physiological and postural data, enabling continuous monitoring that supports long-term health and rehabilitation efforts. These wearables can track muscle activity, heart rate, and other vital signs, improving patient outcomes through ergonomic design that minimizes discomfort. In addition, soft robotic suits and passive exoskeletons have been developed to assist in mobility rehabilitation, offering a blend of comfort and functionality. Despite these advancements, challenges remain. Smart wearables must balance functionality with comfort, especially as many devices can be bulky or restrictive. The integration of artificial intelligence and machine learning offers solutions to some of these challenges, enabling wearables to adapt dynamically to user needs. However, technical issues such as data processing, sensor accuracy, and battery life continue to limit their widespread adoption. Future developments must focus on miniaturization, energy efficiency, and user adaptability to overcome these barriers, ensuring that smart wearables are both effective and practical for diverse ergonomic applications.
  • Publication
    Recent advances in ergonomic studies on material handling mitigating musculoskeletal risks and enhancing worker safety
    ( 2024)
    Ahmad Humaizi Hilmi
    ;
    Asna Rasyidah Abdul Hamid
    ;
    Wan Abdul Rahman Assyahid Wan Ibrahim
    Manual material handling (MMH) tasks are a significant contributor to work-related musculoskeletal disorders (WMSDs), particularly in industries where repetitive motions, awkward postures, and excessive loads are common. Recent advances in ergonomic interventions aim to mitigate these risks, enhancing worker safety and reducing the incidence of injuries. The integration of automation technologies, such as robotic assistants and human-machine interfaces, has proven effective in reducing human involvement in monotonous tasks, thereby alleviating physical strain. Additionally, passive back-support exoskeletons have emerged as promising tools to provide mechanical support during heavy lifting, bending, and repetitive movements, effectively reducing musculoskeletal risks. Technological innovations, including wearable sensors and AI-driven tools, have further improved ergonomic assessments by providing real-time monitoring and feedback on workers’ posture and movements. These advancements allow for timely adjustments and preventive measures, ensuring a safer and more efficient working environment. However, challenges remain regarding the long-term effects and user acceptance of exoskeletons and other ergonomic interventions. Studies also highlight the importance of ergonomic risk assessments, utilizing tools such as the Rapid Entire Body Assessment (REBA) and fuzzy logic models to identify and mitigate high-risk tasks.