Mohd Zaki Nuawi

Mohd Zaki Nuawi
Universiti Kebangsaan Malaysia | ukm · Department of Mechanical and Manufacturing Engineering

Assoc. Professor

About

255
Publications
127,484
Reads
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2,070
Citations
Citations since 2017
53 Research Items
1370 Citations
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2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
Introduction
Mohd Zaki Nuawi currently works at the Department of Mechanical and Manufacturing Engineering, National University of Malaysia. M Z Nuawi does research in Statistical Signal Analysis and Instrumentation Engineering, Acoustic Engineering and Mechanical Engineering. Their current project is mechanical signal analysis for material characterisation.
Additional affiliations
February 1997 - present
Universiti Kebangsaan Malaysia
Position
  • Professor (Associate)

Publications

Publications (255)
Article
Full-text available
Considerable research has been conducted in the past decade and a half regarding the bio-lubricants potential to replace mineral-based lubricants as mainstream lubricants such as engine oil, hydraulic oil, compressor oil, and metalworking oil. This study studied several bio-lubricants (rapeseed oil, palm olein, and soybean oil) and a mineral-based...
Chapter
High-performance machinery operates on fluid-film bearings due to the operating requirements and conditions such as high speed of the shaft. Such extreme operating conditions demand a carefully designed rotor bearing system with suitable lubricant. The lubricant tribological, rheological, and dynamical properties play pivotal role in having the smo...
Article
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Preprogrammed monitoring of engine failure due to spark plug misfire can be traced using a method called machine learning. Unluckily, a challenge to get a high-efficiency rate because of a massive volume of training data is required. During the study, these failure-generated were enhanced with a novel statistical signal-based analysis called Z-freq...
Article
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Magnetic flux leakage (MFL) is a common method used in Non-Destructive Test (NDT) to identify inner surface crack in thick-walled steel. This paper presents an MFL system for the defect detection of a ferromagnetic material embedded in the steel floor. The system applies a novel I-Kaz method as the kurtosis-based algorithm as a post-statistical ana...
Article
This study aims to assess the fatigue life analysis of strain signals with the implementation of a reconstruction of the signals of the discrete wavelet transform (DWT) decomposition technique. The process involves the time and frequency information used in fatigue life analysis. Strain signals, also known as original signals, were measured based o...
Article
Autonomous manufacturing allows the system to distinguish between a mild, normal and total failure in tool condition. K-means clustering has become the most applied algorithm in discovering classes in an unsupervised scenario. Nevertheless, the algorithm is sensitive to the initial centroids giving various solution every time the system updating. R...
Preprint
The purpose of this paper is to investigate the effect of cutting parameters on surface roughness, flank wear and chip formation using CBN tools under the conditions of turning of difficult-to-cut material, Ti6Al4V titanium alloy. Using the signal-to-noise (S / N) ratio, the Taguchi method is used to analyze the impact of cutting parameters on opti...
Article
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The application of hall sensors in Magnetitic Flux Leakage (MFL) has played an important role in Above Storage Tank (AST) on detection of defect caused by corrosion to improve productivity and to avoid catastrophe. The MFL sensor measured magnetic flux distribution in three axes B x , B y and B z. Currently, there are several signal monitoring meth...
Chapter
Full-text available
Nonlinearity is a frequent occurrence in engineering structures. The nonlinearity detection in the operating mechanical systems is important because the nonlinearity can change the dynamic behaviour. The aim of this work is to experimentally measure the nonlinearity of a flexible beam structure due to the different applied dynamic load configuratio...
Article
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This paper presents a statistical analysis to investigatethe correlation between cutting forces and surface roughness values in turning process. Although the correlation of machining processes has been widely studied in metal cutting, it still presents a challenge as surface roughness has to be considered for product quality and it is hard to ensur...
Article
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An alternative advanced statistical analysis method known as the I-kaz 4D or I-kaz 4 channels which using the sensor fusion concept by using four sensors to collect the vibration signals that excited by the impact hammer was introduced in this study. Mechanical properties of the material like Young Modulus and Poisson Ratio were obtained. The study...
Article
This paper presents a chatter detection technique based on the stability of the measured Ra and Rz values of process damping and surface roughness in low cutting speed activities. In practice, process damping during machining procedures is hard to predict and identify due to the model and technique of limitation. The impact of cutting conditions on...
Article
This paper presents the optimization in machining processes on the cutting parameters for the S45C in turning process using the response surface method (RSM). The experimental work conducted investigates the influence of cutting parameters on statistical analysis of signals and surface quality. The paper also presents a statistical analysis of sign...
Article
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p>This paper presents a review of state-of-art in the Magnetic Flux Leakage (MFL) sensor technology, which plays an important role in Nondestructive Testing (NDT) to detect crack and corrosion in ferromagnetic material. The demand of more reliable MFL tools and signal acquisition increase as it has a direct impact on structure integrity and can lea...
Article
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This paper presents a stability analysis to predict regenerative vibration during turning process. Although the stability of machining process has been widely studied in metal cutting it still presents a challenge as surface roughness, tool wear and productivity have to be considered. If the tool is vibrating as it removes material, these vibration...
Article
Purpose The purpose of this paper is to focus on the reliability assessment on the basis of automobile suspension fatigue life using wavelet decomposition method. Design/methodology/approach The discrete wavelet transform (DWT) of automobile coil spring signal is implemented as a response to different road surfaces. A reliability analysis is appli...
Article
Dimples is an important structure in the context of surface texturing due to its role in improving the heat transfer while minimizing wear and friction on sliding mechanical components. In this study, various sizes and shapes of dimple structures were fabricated on a cylindrical surface of a hyper eutectic aluminum silicon alloy (A390) using the tu...
Article
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This paper presents a new statistical-based method of cutting tool wear progression in a milling process called Z-rotation method in association with tool wear progression. The method is a kurtosis-based that calculates the signal element variance from its mean as a measurement index. The measurement index can be implicated to determine the severit...
Article
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Inspired by enhancement of vortex induced vibration energy harvesting as a green and renewable energy source, several geometry shapes such as cylinder, square, triangle, D shape, and U shape bluff body were studied in terms of vortex shedding frequency, vorticity and pressure difference in order to determine the best bluff body for piezoelectric fi...
Article
Full-text available
This paper presents a new statistical-based method of cutting tool wear progression in a milling process called Z-rotation method in association with tool wear progression. The method is a kurtosis-based that calculates the signal element variance from its mean as a measurement index. The measurement index can be implicated to determine the severit...
Article
Full-text available
This research is carried out to determine the sound absorption coefficient (α) and noise reduction coefficient (NCR) of date palm fibre. The specimen made of date palm fibre has been compressed using certain weight to maintain desire thickness range from 10 mm to 50 mm. The specimen has been mixed with coconut fibre at a certain ratio. Experiment h...
Article
Chatter results in poor surface finish, shortened tool life and reduced productivity. Although chatter stability has been widely studied in metal cutting it still presents a challenge as cutting conditions such as cutting speed, feed rate and depth of cut have to be considered. In this paper, the identification of chatter vibration at low speed has...
Article
This paper presents the significance of Discrete Wavelet Transform to provide more accuracy by using the Wavelet (Db4) Daubechies approach to analyse original signals obtained from the actual responses of an automotive suspension system. The time-frequency domain considers both time and frequency parameters, making this approach more efficient comp...
Article
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Recent developments in ultrasonic material testing have increased the need to evaluate the current status of the different applications of piezoelectric elements (PEs). This research have reviewed state-of-the-art emerging new technology and the role of PEs in tests for a number of mechanical properties, such as creep, fracture toughness, hardness,...
Article
Disc brake or rotor squeal is an ongoing problem that occurs in the automotive industry. An undesirable disc brake noise problem can arise after a period of time of usage. The purpose of this paper is to investigate the structural dynamic behaviour of disc brakes with different wear thickness by using Experimental Modal Analysis. The wear thickness...
Article
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While driving, a driver is required to control the steering wheel to change direction. The driver's muscles of the upper limbs and shoulders are involved in such a task. Therefore, an assessment of the driver's physiology according to certain condition is necessary to improve driving comfort and safety. This study aims to investigate the driver's D...
Article
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Tool failure is a major and undesirable occurrence affecting the overall operating cost and time as the machining needs to be done once again to fix the mistake. Therefore, this paper introduced an efficient and inexpensive way to overcome the problem by developing tool wear monitoring system using Macro-Fibre Composite (MFC) sensor via alternative...
Article
This study was undertaken to develop an alternative method based on signal analysis known as I-kaz 4D or I-kaz 4 channels. The aim was to characterize several mechanical properties including Poisson Ratio (PR), Vickers Hardness (VH), Yield Strength (YS), Tensile Strength (TS), Compression Strength (CS) and Fatigue Strength (FS). Specimens used are...
Article
Full-text available
This paper provides an application of fundamental statistical analysis named Z-freq technique about fault detection in a gasoline engine. In engine condition monitoring, early detection of failure symptom is an important function to prevent decreasing of engine performance during operation. Signal was measured using hardware named SO signal analyze...
Article
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The newly developed multi-sensor system for a milling process sensor system is capable of simultaneously measuring six channels of machining signals using a rotating tool incorporating a wireless system. Furthermore, the system can be used to measure the spindle torque, Tq; tool vibration in the z-axis, Az; tool tip temperature, Tm and the three co...
Article
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This study determines the effect of modal parameters namely natural frequencies and mode shapes of aluminum 6061 (Al6061)through free dynamic vibration analysis and testing. The simulation procedures was conducted via ANSYS software while the experimental work was performed through impact hammer testing. Three types of specimens in the form of circ...
Article
Full-text available
This study was undertaken to develop an alternative method based on signal analysis known as I-kaz 4D or I-kaz 4 channels. The aim was to characterize several mechanical properties including Poisson Ratio (PR), Vickers Hardness (VH), Yield Strength (YS), Tensile Strength (TS), Compression Strength (CS) and Fatigue Strength (FS). Specimens used are...
Article
Impulsive excitation is a non-destructive test to determine the elastic properties of materials. The transient-decaying signal can be measured using a contact or non-contact type of sensor. The aim of this study is to assess the optimal contact sensor position for an impulsive excitation test purpose. Rectangular bar of medium carbon steel S50C is...
Article
Full-text available
This paper focuses on analysis in determining the behaviour of variable amplitude strain signals based on extraction of segments. The constant Amplitude loading (CAL), that was used in the laboratory tests, was designed according to the variable amplitude loading (VAL) from Society of Automotive Engineers (SAE). The SAE strain signal was then edite...
Article
This paper reports the influence of cylindrical granular materials on the acoustic absorption performance of a natural fiber composite. The acoustic absorption behavior of an innovative fibro-granular composite composed of natural fibers combined with granular materials was investigated. The fibrous part of this new composite is fabricated using co...
Article
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p>Real-time optimization (RTO) has attracted considerable interest among researchers and industries for being able to optimise the plant economics such as product efficiency, product quality and process safety in the wake of increasing global competitions. The success of RTO depends much on the quality of model being used in the optimisation. The p...
Article
This study aims to accelerate fatigue tests using simulated strain signals. Strain signals were acquired from a coil spring involving car movements. Using a mathematical expression, the measured strain signals yielded acceleration signals, and were considered as disturbances on generating strain signals. The simulated strain signals gave the testin...
Article
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Modal Analysis is a common practice to define parameters of structure under scientific view. Experimental Modal Analysis (EMA) is a well-known procedure to determine modal parameters. The usage of piezoelectric film sensor as viable and cost-saving device is indeed a need in this advance and sophisticated era. An experiment is conducted to determin...
Article
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This paper discusses the development method to determine the accuracy of pronunciation of the word using global statistical signal analysis parameters. An engineering word that has been chosen is 'leaching'. The pronunciation of the word 'leaching' in the French language has been recorded from 1 native speaker and 4 students. The recording processe...
Article
Full-text available
This study is conducted to determine the modal parameters namely natural frequencies and mode shapes of aluminum 6061 (Al6061). The parameters are done by conducting a free dynamic vibration analysis. Modal analysis study was conducted by both simulation and experimental approaches. The simulation was conducted via ANSYS software while the experime...
Article
Full-text available
This study presents the creation of a Karman vortex for a fluttering electromagnetic energy harvester device using a cylinder. The effects of two parameters, which are the diameter and the position of the cylinder, were investigated on the Karman vortex profile and the amplitude of the fluttering belt, respectively. A simulation was conducted to de...
Article
Full-text available
This study is conducted to determine the modal parameters namely natural frequencies and mode shapes of aluminum 6061 (Al6061). A light and small structure made from Al6061 is chosen as the experimental specimen mainly because of its wide application in industries such as automotive parts or accessories and robotic, mainly in manufacturing of autom...
Article
This study aims to introduce a novel method for accelerating fatigue tests. Strain signals measured at automotive suspension components were extracted based on the Morlet wavelet producing damaging segments. Furthermore, the segments were clustered using the Fuzzy C-Means to remove the segments having lower energy. The process was able to shorten t...
Article
The detection of cutting tool wear during a machining process is one of the most important considerations in automated manufacturing systems. This study presents a new approach for classification and detection of tool wear in milling process using multi-sensor signals and Mahalanobis-Taguchi system (MTS). The MTS is one of the decision making and p...
Article
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The aim of this work is to present the corrosion damage mechanism of austenitic stainless steel 304. The C-ring specimens are chosen according to ASTM G-38 to resemble the stress conditions during the applied load. The specimens are immersed in 3.5% wt of NaCl solution. The variable conditions were studied at a fixed stress of 379Mpa and immersions...
Article
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This paper aims to describe the development of a statistical analysis method called the integrated kurtosis-based algorithm for a Z-notch filter (I-kaz) Vibro for monitoring hand-arm vibration (HAV) in Malaysian Army (MA) three-tonne truck steering wheels. HAV from the steering wheel was measured using a single axis piezoelectric accelerometer that...
Article
Full-text available
The best feature scheme is vital in musical instrument sound clustering and classification, as it is an input and feed towards the pattern recognition technique. This paper studies the relationship of every traditional Malay musical instrument acoustic sounds by implementing a correlation and clustering method through the selected features. Two typ...
Article
This study is conducted to determine vibration or modal parameters such as natural frequencies and mode shapes of aluminum 6061 (Al6061). If the component vibrates with frequency coherence with the natural frequency, resonance frequency will occur and structural failure might emerge. Modal analysis study is conducted by both simulation and experime...
Article
Full-text available
The present study provides an evaluation of cabin noise inside a passenger car cabin for two types of roads in tropical environmental conditions in Malaysia. Tropical weather conditions are hot and humid, with rain also giving effect to the road surface condition. Noise exposure was measured using a DuO sound level meter, which is capable to record...
Article
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The specific mechanical constant of a material can be determined by examining in detail its dynamic pulse response or dynamic resonance. This paper proposes the use of the Multilevel Integrated Kurtosis Algorithm with Z-notch Filter (I-kaz multilevel) signal analysis method which is used on dynamic resonance signals to predict the value of specific...
Article
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This paper proposes an implementation of alternative statistical signal analysis method in characterising material properties of polymer using impulse excitation technique (IET) in accordance with ASTM E1876 standard. Five types of cylindrical shape polymer specimens are used, namely acrylics (AC), poly vinyl chloride (PVC), polyethylene (PE), cast...
Article
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This paper presents the effect of temperature on the fatigue life behaviour of aluminium alloy AA6061, under constant loading conditions, by using an analytical approach. Most of the moving components in automotive engines are under the combined effects of fatigue and temperature. Fatigue life predictions by using conventional experimental methods...
Article
This paper focuses on the evaluation of fatigue damage classification based on statistical probability distribution using Weibull analysis. Feature extractions, i.e., kurtosis, wavelet-based energy, and fatigue damage, were calculated from the segments of fatigue strain signal. The feature extractions were then classified using artificial neural ne...
Article
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Flapping wing in tandem configuration may offer enhanced aerodynamic performance at low Reynolds number, in which micro air vehicles operate. The present study aims to investigate the effect of fore-hind wing pitch difference on the aerodynamic performance of tandem wings. To that end, two-dimensional, laminar flow around two thin flat airfoils tha...
Article
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In this paper, the I-kaz™ method is proposed for the detection of induction motor bearing faults using vibration signals, which has not been presented so far. The purpose of the study is to compare this new technique with the classical kurtosis method in the time domain and to validate the performance of the proposed I-kaz coefficient using a decis...
Article
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Cutting tool wear is one of the major problems affecting the finished product in term of surface finish quality, dimensional precision and the cost of the defect. This paper discusses the preliminary study on machining condition monitoring system using force data captured using 3-channel force sensor. The data were analyzed by I-kaz multilevel meth...
Article
Tool condition monitoring (TCM) system in the industry are mainly used to detect tool wear, breakage and chatter on the tool. Tool wear of AISI P20 under various cutting conditions have been investigated in end milling using cutting force signals due flank wear progression. This study is focused on the piezoelectric sensor system which is integrate...
Article
Full-text available
Characterization of material properties is a vital aspect in engineering structural design as it practically use as a mechanical component. Nonetheless with such application, the component is highly vulnerable to failed under active loading condition. To prevent such failure, a reliable test to characterize the in-service structural component and i...
Article
Full-text available
This paper proposes a method by analysing the free vibration behavior of various polymers for fatigue strength property characterisation. Four disc-shaped specimens with different types of polymer were prepared, namely polyethylene, polycarbonate, polyoxymethylene and polyamide. Experimental dynamic tests were carried out based on ASTM E1876 to mea...
Article
Full-text available
Exposure to noise and vibration in the driver's cabin of Malaysian Army (MA) three-tonne trucks can cause discomfort to the drivers and passengers, and can be classified as hazardous if exposed to more than the standard 8 h time period. This study was conducted for two different road conditions often used by MA vehicles; tarmac and dirt roads. Nois...