Ilker Murat Koc

Ilker Murat Koc
Istanbul Technical University · Department of Mechanical Engineering

PhD

About

41
Publications
2,646
Reads
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285
Citations
Citations since 2017
14 Research Items
121 Citations
20172018201920202021202220230510152025
20172018201920202021202220230510152025
20172018201920202021202220230510152025
20172018201920202021202220230510152025

Publications

Publications (41)
Article
Transportation is one of the most significant sources of emissions across various industries. Projections indicate that electric vehicles (EVs) will attain a considerable portion of the vehicle market in the next decade. In this paper, Well-to-Wheels (WTW) greenhouse gas (GHG) emissions are analyzed both for conventional and EVs by using generated...
Article
This study focuses on the real-time measurement of the distributed pinch force in minimally invasive surgery with a piezoresistive tactile sensor. The measurement of the pinch force in distributed form is important because the conventional surgical tools have angular opening/closing mechanism, which causes non-uniform force distribution on the cont...
Article
Multi purpose hydraulic die spotting presses can be used for both die spotting and mass production. Due to the reducing cycle time of hydraulic presses in mass manufacturing, dynamic analysis can be used to determine the oscillations caused by the structural design of the hydraulic press. Oscillations are generated during loading and unloading cycl...
Article
This study investigates coefficient of friction of flat-tipped laparoscopic surgery tool (bowel grasper) in an ex vivo experiment in order to identify the approximate coefficient of friction between laparoscopic tool and the organic sample. The estimation of friction force is essential for ensuring safe grasping. The friction tribometer and the lap...
Article
This study investigates direct and indirect measurement techniques for a typical laparoscopic operation in an ex vivo experiment. The direct measurement technique involves obtaining contact forces at the tissue-tool level. The indirect measurement technique involves acquiring contact forces without compromising the contact surface. The two techniqu...
Article
This study proposes an approximate analytical model on frictional dynamics of a single visco-elastic pillar used for texturing soft surfaces. The frictional dynamics and contact interaction of the pillar with the smooth flat counter surface is modeled with lumped parameters in order to estimate the friction force and the normal load. The effect of...
Article
In this work, studies are carried out on the adhesion and friction of composite pillars contact with a smooth flat surface. The composite pillar is obtained by allocating additive metal particles to a polymer matrix. The aluminum micron-sized particles are added to a polymer matrix in different mass ratios, which is aimed at an alteration of struct...
Article
The grasping action in a minimally invasive surgery operation is a blind operation in terms of the touch feedback and may result an undesirable tissue damage during the surgery. In this study, the interaction of the minimally invasive surgery tool with the tissue investigated by integrating a high resolution tactile sensor to the end-effector of th...
Article
The friction force of a single elastomeric pillar on a smooth substrate is investigated under harmonic base excitation. Friction force variation is acquired for various excitation frequencies with a constant base acceleration where the pillar stays in stick regime. The peeling behavior of the pillar for different harmonic base displacements is disc...
Conference Paper
Each laparoscopic surgery tool has specific design and task, which includes grasping, cutting, clamping, retraction etc. for surgery. This study deals with kinetic analysis of a conventional laparoscopic grasper in order to obtain a simple and valid analytical model that allows optimization of tool dimension, and verification of the model with expe...
Conference Paper
The friction force between a polydimethylsiloxane (PDMS) pillar in contact with a flat glass substrate is examined. The friction between the pillar and the glass is achieved with lateral loading of the glass under constant velocity. The friction force during the lateral motion is estimated by modelling the motion of the pillar as a lumped parameter...
Article
Purpose The purpose of this paper is to investigate the stability of a small scale six-degree-of-freedom nonlinear helicopter model at translator velocities and angular displacements while it is transiting to hover with different initial conditions. Design/methodology/approach In this study, model predictive controller and linear quadratic regul...
Article
The excessive grasper force may lead to irrevocable damage to the tissue in minimally invasive surgery. This study focuses on grasping mechanism of a laparoscopic surgery tool in order to control the grasping force. First, the dynamics of grasping mechanism of a conventional laparoscopic grasper is investigated using analytical and experimental met...
Article
The frictional dynamics of a single elastomeric pillar is studied analytically and experimentally in meso-scale. An energy equilibrium of a single pillar is established to analyze the static and kinetic friction regime. The kinematics of the system as well as the components of the total energy of the system is identified. In the experimental sectio...
Conference Paper
Full-text available
This paper introduces the characterization study of a new actuator design -“Adhesive Pillar Based Air Levitation” (APAL) system- to manipulate fine objects in a non-destructive manner. A meso-scale polymer adhesive pillar array manages to gently contact the fine surfaces and moreover adapt variable interface geometries. Air flow, which is fed throu...
Article
Full-text available
The tactile sensors are primarily used to measure the contact area and normal pressure of contacting two solids. The common deficiencies of the current tactile sensors are flexibility, adaptation to contacting bodies, normal and lateral resolution. In order to overcome these limitations, this work presents the fabrication of polymer meso and micro...
Article
The sensing capability of PVDF piezoelectric film integrated with PDMS polymer vertical fiber array has been analyzed using finite element method. The fiber structure on the foot of the gecko, spiders and other insects gives inspiration to design of tactile sensors made out of synthetic fibrillar structures. A vertical array of synthetic polymer fi...
Article
There have been many attempts for quantitative assessment of constructional differences of woven fabrics in view of perceived touch. This research focuses on quantifying the tactile perception of minor changes in constructional parameters (yarn density, yarn fineness and pattern) of fabrics by rubbing with an artificial finger tip at achievable pre...
Conference Paper
For the control of unmanned helicopter, different controllers have been designed in the literature. Model Predictive Control (MPC) was used in process industry for years. But its application to helicopters is new. In this study, six degrees of freedom nonlinear dynamical model of unmanned helicopter is used to control the translatory velocities and...
Conference Paper
Full-text available
Today, a simple and reliable hand evaluation test method and instrument are not available. This reality caused researches on the topic of friction based studies. In this study frictional properties of woven woolen fabrics are investigated by using a new friction measurement setup for fabrics. Appropriate probe material, diameter, and velocity of th...
Conference Paper
Full-text available
Fabric hand is one of the important quality parameter in textiles. There has been an interest by the researchers on this topic and therefore a few systems are offered. Although " Kawabata Evaluation System for Fabrics " is the well known system for hand evaluation, it could not take part in the industrial quality control assessment as it requires l...
Article
This study extends the previous applications of linear energy sinks to steady‐state vibration absorption. First developed for the absorption of transient vibrations, linear energy sinks also act as effective vibration absorbers under steady‐state excitation. However, their effectiveness depends on the value of excitation frequency with respect to t...
Article
Through two complementary approaches, using modal response and wave propagation, this presentation will show the conditions under which a decaying impulse response, or a nearly irreversible energy trapping, takes place in a linear conservative continuous system. The results show that the basic foundation of near‐irreversibility or pseudo‐damping re...
Article
Through two complementary approaches, using modal response and wave propagation, the analyses presented here show the conditions under which a decaying impulse response, or a nearly irreversible energy trapping, takes place in a linear conservative continuous system. The results show that the basic foundation of near-irreversibility or apparent dam...
Article
This paper presents experiments that demonstrate the concept of energy sinks, which when attached to a vibrating structure can absorb most of its energy. Energy sinks consist of a set of undamped linear oscillators and, in principle, do not require presence of damping in the classical sense. The set of undamped oscillators that make up an energy si...
Article
This paper describes a new concept referred to here as ``energy sinks'' as an alternative to conventional methods of vibration absorption and damping. A prototypical energy sink envisioned here consists of a set of oscillators attached to, or an integral part of, a vibrating structure. The oscillators that make up an energy sink absorb vibratory en...

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