Romol ChaddaTechnische Universität Darmstadt | TU · Department of Electrical Engineering and Information Technology (Dept.18)
Romol Chadda
Master of Science
About
25
Publications
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Introduction
Publications
Publications (25)
Standardized fasteners such as bolts are particularly suitable for structurally integrated force measurements, as they are located directly in the force flow and therefore allow the monitoring of the overall system status in-situ via the multi-axis components of the acting forces. Available solutions are either tailored to specific applications or...
Abstract—The development of piezoelectric sensors using ferroelectrets is a very active field that is increasingly gaining
importance. Recently, 3D-printing ferroelectret sensors using
fused deposition modeling technique has been extensively investigated due to its unparalleled advantages in terms of design
flexibility and cost-effectiveness. Never...
Piezoelectrets (or Ferroelectrets) are polarized cellular polymers exhibiting outstanding piezoelectric activity. Recently, a new manufacturing route has been introduced by combining 3D-printed elastomeric soft grids and bulk fluorinated ethylene propylene (FEP) thin films to build an artificial ferroelectret sandwich exhibiting outstanding
d
<su...
Lateral mandibular movement is essential for grinding previously ingested food. By measuring the maximum lateral force of the mandible, it is possible to quantify the functionality of this important movement. However, state-of-the-art force sensors utilize the force application through the teeth, causing unknown measurement uncertainties, and, thus...
We present a multi-axis force sensor capable of measuring both axial forces and bending moments that is integrable into a cavity within a M20 bolt. This cavity, which reduces the resilience of the bolt by 23.5 %, and, thus, corresponds to a reduction by only one strength class, is designed by conducting a finite element analysis. The force sensor f...
Laser-based powder bed fusion as an additive manufacturing process allows the integration of sensors at any location within the manufactured part. This allows for manufacturing smart parts that can be integrated into complex structures for monitoring applications, as they can perform in-situ measurements. Especially, monitoring of force and torque...
Sensor-integrating machine elements (SiME) are essential enablers for digitization in the industry. There are major challenges in the development of SiME as an interdisciplinary mechatronic system, requiring methodical support. In this work, we address these challenges and aim to provide methods and tools by analyzing the state-of-the-art and ten o...
Bite force is an important characteristic of the masticatory systems functional state. Especially force asymmetries are potential indicators for malfunctions such as temporo-mandibular disorders or dysgnathia. By measuring bilaterally, i.e. simultaneously on the left and right side, it is possible to quantify asymmetries. Currently, there is a lack...
Um den Menschen bedarfsgerecht und ergonomisch unterstützen zu können, müssen Assistenzsysteme die Bewegungen und Bewegungsabsichten des Nutzers frühzeitig erkennen. Die Individualität der menschlichen Bewegung ist dabei eine
besondere Herausforderung. Dieser Beitrag zeigt, dass maschinelles Lernen geeignet ist, um aus den Daten ausgewählter, am Kö...
Purpose
Electromagnetic tracking (EMT) can partially replace X-ray guidance in minimally invasive procedures, reducing radiation in the OR. However, in this hybrid setting, EMT is disturbed by metallic distortion caused by the X-ray device. We plan to make hybrid navigation clinical reality to reduce radiation exposure for patients and surgeons, by...
Purpose: Electromagnetic Tracking (EMT) can partially replace X-ray guidance in minimally invasive procedures, reducing radiation in the OR. However, in this hybrid setting, EMT is disturbed by metallic distortion caused by the X-ray device. We plan to make hybrid navigation clinical reality to reduce radiation exposure for patients and surgeons, b...
We present a disruptive method for manufacturing structure-integrated force sensors based on the LPBF process by inserting a strain sensing steel plate in the additive manufacturing process of the deformation element. In order to investigate the strain transmission from the printed part to the integrated steel plate, we built two prototypes which d...
We present a 15 N nominal force sensor, manufactured with a disruptive method based on laser-based powder-bed-fusion. This additive manufacturing process enables the application-specific realization of a deformation element for a structural integrated sensor for condition monitoring applications. Manufacturing of the deformation element is done by...
We present a wearable vibrotactile feedback device consisting of four linear resonant actuators (LRAs) that are able to generate virtual stimuli, known as phantom tactile sensation, for human-robot interaction. Using an energy model, we can control the location and intensity of the virtual stimuli independently. The device consists of mostly 3D-pri...
Advanced acoustic levitation devices featuring flexible, lightweight, wide bandwidth, and film-like transducers based on ferroelectrets are designed and fabricated for sophisticated manipulation of particles in a simple way. Owing to the unique properties of ferroelectret films, such as high piezoelectric activity, very small acoustic impedance, a...
Advanced acoustic levitation devices featuring flexible, lightweight, wide bandwidth, and film-like transducers based on ferroelectrets are designed and fabricated for sophisticated manipulation of particles in a simple way. Owing to the unique properties of ferroelectret films, such as high piezoelectric activity, very small acoustic impedance, a...
We present a 10 N nominal needle tip force sensor based on silicon-based semiconductor strain gauges that can be used in brachytherapy or biopsies. As deformation body the guiding rod of such a surgical needle with a diameter of 1.2 mm is used. In a thinned area, near the tip of the needle, the strain gauge, as sensing element, is applied with a fl...
For quality control and functionality testing, Contact Normal Forces F N need to be measured in multi contact point connectors like MCON 8 with the least mating cycles possible. This article is about the design and the characterization of a 4-channel gage. Each channel gage consists of a metal transducer with a metal foil strain gage. The forces ra...
Continuum robots are inspired by biological trunks, snakes and tentacles. Unlike conventional robot manipulators, there are no rigid structures or joints. Advantageous is the ease of miniaturization combined with high dexterity, since limiting components such as bearings or gears can be omitted. Most currently used actuation elements in continuum r...
In minimally invasive surgery, new flexible instruments enable safer and easier access to difficult-to-reach anatomical regions. However, their introduction into the clinical workflow requires robust replanning, because navigation errors during surgery render initially planned trajectories infeasible. Such replanning requires to regularly solve an...
Zusammenfassung: Formgedächtnislegierungen (FGLen) werden bereits in verschiedensten Anwendungen in der Medizin eingesetzt. Hierzu zählen unter anderem medizinische Implantate, wie zum Beispiel Stents (Gefäßstützen) und orthodontische Drähte, die von der superelastischen Eigenschaft von Nickel-Titan Gebrauch machen. Darüber hinaus existiert jedoch...