Wahyudin P. Syam

GMV UK

Static friction modeling is a critical task to have the accurate robot model. In this article, a neural network separation approach to include nonlinear static friction in models of industrial robots is proposed. For this purpose, the terms corresponding to static friction within the overall robot mathematical model are separable terms treated inde...

The prototype, consisting of a single Tx-Rx communication link, was tested in indoor-to-indoor, outdoor-to-outdoor and outdoor-to-indoor communication scenarios and in both static and dynamic conditions. The outdoor-to-indoor results indicate that, with further development, the Civilian and Assets Recovery System (CARS) is a promising navigation an...

BIOGRAPHIES Wahyudin P. Syam holds a PhD in geometrical measurement and uncertainty analysis from Politecnico di Milano in Milan, Italy. After finishing PhD, he held a post-doctoral research position at University of Nottingham for five years. During his post-doctoral research position, he gets experiences in machine learning for measurement and im...

This paper presents a slant Total Electron Content (STEC) forecasting machine learning (ML) model focusing on the region of Europe and North Africa, and on the use of spatial as well as temporal information. The input parameters of the ML ionosphere model are STEC (dual frequency observations and a calibration procedure for the satellite and statio...

Biography(ies) Shishir Priyadarshi obtained his PhD in Space Physics from the Space Research Centre, Poland in 2014. Thereafter, he held various international postdoctoral and adjunct faculty positions between 2014 and 2021. In 2021, he joined the University of Bath as a Research Associate, subsequently he joined GMV as a Machine Learning Engineer...

Crisis modes, following natural or human made disasters are unexpected and can take place anywhere and anytime, imposing crisis management to heavily rely on telecommunication and localisation infrastructure available during the crisis to support the execution of rescue operations. Very often in these situations, there are several challenges that n...

The paper presents the comparison of uncertainty measurement estimations of the energy performances of gas stoves. The Guide to the Expression of Uncertainty in Measurement (GUM) framework and two Monte Carlo Simulation (MCM) approaches: ordinary and adaptive MCM were applied for the energy performance uncertainty: thermal energy and efficiency mea...

Light spectrum dispersion is an exciting subjectin science because of its beautiful atmospheric colour phenomenon which attracts students. However, to see the phenomenon is not easy since it needs a spectrometer, which is commonly expensive. Therefore, the present study aims to describe a low-cost spectrometer for investigating lighting spectrum an...

On-machine areal surface topography measuring instruments are required for fast and accurate measurement of parts inside production machines without reducing production rates. This paper presents the design and development of a compact focus variation microscopy sensor that can be integrated into various types of machine tools. The paper focuses on...

Segmentation of dried amnion biomaterial tends to produce invalid (outlier) contour point detections due to texture and colour inhomogeneity of the biomaterial. In this paper, a novel implementation of a non-stationary Bayesian learning process for outlier contour point removal of amnion segmentations is presented. This outlier removal method is in...

Fast and accurate in-line areal surface topography measuring instruments are required to control the quality of microscale manufactured components, without significantly slowing down the production process. Full-field areal optical surface topography measurement instruments are promising for in-line or on-machine measurement applications due to the...

Oral paper

To address the increase in tight tolerance requirements for small parts produced by precision manufacturing, on-machine optical areal surface topography instruments are emerging. To calibrate these instruments and estimate their measurement uncertainty, their metrological characteristics need to be determined according to ISO 25178 part 600. In thi...

We present the novel design of an all-optical dimensional measuring system (AODMS) for measuring the geometry and surface texture of small-scale components. The system is designed to operate in a cube of 100 mm sides, with micrometre or sub-micrometre measurement uncertainties. The AODMS includes a four-axis motion system for mounting and moving th...

Recent advances in additive manufacturing have enabled fabrication of phononic crystals and metamaterials which exhibit spectral gaps, or stopbands, in which the propagation of elastic waves is prohibited by Bragg scattering or local resonance effects. Due to the high level of design freedom available to additive manufacturing, the propagation prop...

Analisis rantai variasi (toleransi) sebuah produk merupakan metode analisis yang sangat penting diketahui. Metode ini dapat digunakan untuk menganalisis cacat dari suatu disain atau memprediksi total variasi pada sebuah karakteristik kunci sebuah produk setelah dirakit, sebelum proses manufaktur produk tersebut dimulai. Buku ini menjabarkan mulai d...

Wireless technology is becoming one of the key technologies that allows an increase in the productivity of a manufacturing process. In this paper, a compact on-machine areal surface texture and form measurement sensor based on focus variation is presented. Considering the feasibility of operating in real-time inside a production machine, the curren...

We report on numerical modelling of three-dimensional lattice structures designed to provide phononic bandgaps. The examined lattice structures rely on two distinct mechanisms for bandgap formation: the destructive interference of elastic waves and internal resonance. Further to the effect of lattice type on the development of phononic bandgaps, we...

The productivity rate of a manufacturing process is limited by the speed of any measurement processes at the quality control stage. Fast and effective in-line measurements are required to overcome this limitation. Optical instruments are the most promising methods for in-line measurement because they are faster than tactile measurements, able to co...

This paper proposes a practical methodology to quantify and compensate lateral errors for focus variation microscopy measurements without stitching. The main advantages of this new methodology are its fast and simple implementation using any uncalibrated artefact. The methodology is applied by performing measurements with multiple image fields with...

In this paper, the phonon dispersion curves of several surface-based lattices are examined, and their energy transmission spectra, along with the corresponding bandgaps are identified. We demonstrate that these bandgaps may be controlled, or tuned, through the choice of cell type, cell size and volume fraction. Our results include two findings of h...

Information-rich metrology (IRM) is a new term that refers to an approach, where the conventional paradigm of measurement is transcended, thanks to the introduction and active role of multiple novel sources of information. The overarching goal of IRM is to encompass and homogenise all those measurement scenarios where information available from het...

Focus variation microscopy measures both the areal form and areal surface texture of components. Improvements to the accuracy and precision of focus variation microscopes usually requires measurements with multiple image-fields to compensate lateral stage errors. This paper proposes a methodology for compensation of lateral stage error of a focus v...

This paper presents the design, analysis and experimental verification of strut-based lattice structures to enhance the mechanical vibration isolation properties of a machine frame, whilst also conserving its structural integrity. In addition, design parameters that correlate lattices, with fixed volume and similar material, to natural frequency an...

In the last decade, there has been considerable growth in the production of end-use polymer parts and components using additive manufacturing methods. A wide range of polymers, from Nylon-12 to thermoplastic polyurethane polymers, can be processed with complex geometry tailored to specific function. However, due to the nature of the layer-by-layer...

Areal surface texture measuring instruments can be calibrated by determining a set of metrological characteristics currently in the final stages of standardisation. In this paper, amplification, linearity and perpendicularity characteristics have been determined to calibrate the lateral performance of a focus variation microscope. The paper present...

Traceability in micro-metrology requires an infrastructure of accredited metrology institutes, effective performance verification procedures, and task specific uncertainty estimation. Focusing on the latter, this paper proposes an approach for the task specific uncertainty estimation based on simulation for a generic 3D microscope. The proposed sim...

Information-rich metrology (IRM) is a new term that refers to an approach , where the conventional paradigm of measurement is transcended, thanks to the introduction and active role of multiple novel sources of information. The overarching goal of IRM is to encompass and homogenise all those measurement scenarios where information available from he...

Metrologi adalah ilmu pengukuran. Dalam industri manufaktur, pengukuran geometri dan analisis ketidakpastian dari hasil pengukuran merupakan hal yang sangat penting dalam metrologi untuk manufaktur. Dengan metrologi manufaktur, kualitas produk dan efisiensi produksi yang tinggi dapat direalisasikan. Buku ini membahas aspek-aspek dari metrologi manu...

Information-rich metrology (IRM) is a term that we introduce to refer to an approach where the conventional paradigm of measurement is enhanced, thanks to the introduction and active role of multiple novel sources of information. The overarching goal of IRM is to encompass and homogenise all those measurement scenarios where information available f...

Measurement noise is one of the ISO-proposed metrological characteristics of areal surface texture instruments [1, 2, 3, 4]. Measurement noise includes all of the unwanted contributions to the output signals when the instrument is used in its normal operating condition [5, 6]. This paper focuses on detecting the non-linearity signature of the verti...

Optical instruments for areal topography measurement can be especially sensitive to noise when scanning is required. Such noise has different sources, including those internally generated and external sources from the environment [1]. For some instruments, it is not always possible to evaluate each single contributor. Nevertheless, it is possible t...

In this study, we investigate the use of additively manufactured strut-based lattice structures to enhance the mechanical vibration isolation properties of a structure. Three lattice designs, inspired by the common strut-based lattice structures, are presented. Design parameters to compare the lattice structures at the design stage are proposed. Fi...

Performance verification of a coordinate measuring system (CMS) is important for instrument acceptance, re-verification, comparability as well as measurement traceability to the definition of the meter. State-of-the-art ISO 10360 standard series is the reference text about the procedure of verification for CMS. Specifically, ISO 10360-8 considers o...

Coherence scanning interferometry (CSI) has seen a rapid uptake in manufacturing industry for use in quality control of parts that require surface texture to be controlled to the micrometre and nanometre levels. This uptake is largely due to the relative speed of measurement of CSI compared to other techniques, as well as its claimed potential for...

Defects produced during selective laser sintering (SLS) are difficult to non-destructively detect after build completion without the use of X-ray-based methods. Overcoming this issue by assessing integrity on a layer-by-layer basis has become an area of significant interest for users of SLS apparatus. Optical coherence tomography (OCT) is used in t...

Fitting algorithms play an important role in the whole measuring cycle in order to derive a measurement result. They involve associating substitute geometry to a point cloud obtained by an instrument. This situation is more difficult in the case of non-linear geometry fitting since iterative method should be used. This article addresses this proble...

Wear is an unavoidable phenomenon in tooling. Many studies have been conducted to try to reduce it. In the case of microtools, the problem of wear is even more difficult to approach. Microtools wear mechanics and characteristics are not well known yet. In this work, we will focus on the microtool wear measurement and characterization as a first ste...

Micro manufacturing is important for new product application. As such, due to its size, micro tolerance verification is a challenging task. Optical metrology instruments provide solutions for this task due to their flexibility in accessing the part surface. In addition, it can capture big data in shorter time compared to the tactile (contact) ins...

Additive manufacturing (AM) is already diffused and well-accepted as a revolutionary method of manufacturing. The main advantage gained by using AM compared to conventional subtractive method is its capability to produce parts which have high shape complexity, different material composition, hierarchical complexity and functionality complexity. B...

A 4-axis system configuration of optical instrument has a significant advantages in improving accessibility to measure a part geometry, such as micro-tool and micro-mould. Performance verification of measurement involving simultaneous 4-axis movement is a new challenge, since in the ISO10360 standard, it is separately considered as linear and r...

This article describes the performance verification of 3D optical measuring instruments integrating a rotational axis using an artifact. The goal is the performance verification of four-axis measuring systems for the full 3D acquisition of micro-geometric parts. This type of measurement has many potential applications, such as in micro-tool, micro-...

Additive manufacturing (AM) is becoming more diffused. In spite of its advantages: capability to manufacture complex internal feature and material efficiency, AM has inherent drawback from its layer-by-layer nature. " Staircase effect " is observed due to the slicing process of the computer model in which a rough surface from a theoretically smooth...

Product quality is a main concern today in manufacturing; it drives competition between companies. To ensure high quality, a dimensional inspection to verify the geometric properties of a product must be carried out. High-speed non-contact scanners help with this task, by both speeding up acquisition speed and increasing accuracy through a more com...

Micro manufacturing is becoming more diffused due to its important for new application product. Micro machining plays an important role for such process [1]. As a consequence, metrology of micro cutting tool is demanding. Non-contact measurement instrument is preferable for micro tool compared to tactile instrument due to better accessibility a...

In this study, we addressed Single Objective Linear Programming (SOLP). This article proposed a new combination of Chaos Optimization Algorithm (COA) with Affine Scaling Search (AFS) to be used as a Hybrid COA and AFS algorithm (Chaos AFS) for solving SOLP. The potential of COA as an emerging optimization algorithm to improve efficiency and effecti...

Product quality is becoming a main concern in today manufacturing. As such, a dimensional metrology is strictly necessary. High accuracy result while reducing speed in measuring a product has to catch up with the improvement of metrology instrument which can capture many points in less time. Fitting algorithm of points cloud from measurement plays...

Purpose The purpose of this paper is to investigate the potential application of electron beam melting, as a layered manufacturing process, to fabricate dental coping of metal‐ceramic crown restoration using Ti6Al4V powder. Design/methodology/approach This experiment was conducted in two steps: shrinkage study to determine scale up factor for shri...

This study improved and comprehensively compared three Meta heuristics to minimize make-span (Cmax) for Flexible Flow-Shop (FFC) Scheduling Problem. This problem is known to be NP-Hard. This study proposed an improvement for three Meta heuristic searches which are Genetic Algorithm (GA), Simulated Annealing (SA), and Tabu Search (TS). SA and TS are...

The design and fabrication processes of a metallic coping for metal-ceramic crown (MCC) restoration along with the accuracy, metallurgical analyses and the cost analysis are presented in this paper. The metallurgical analysis exhibited that a 100% dense coping could be obtained by EBM fabrication. Micro-CT scanning for accuracy analysis of complex...

The fundamentals and latest developments of Rapid Prototyping (RP) and Rapid Manufacturing (RM) technologies and the application of most common biomaterials such as titanium and titanium alloy (Ti6Al4V) are discussed in this paper. The issues while fabricating pre-surgical models, scaffolds for cell growth and tissue engineering and concerning fabr...