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Khan, Imran
Alternative names
Publications (10 of 14) Show all publications
Khan, I. (2017). Measurements, Analysis Techniques and Experiments in Sound and Vibration: Applied to Operational MRI Scanners and in Remote Laboratories.. (Doctoral dissertation). Karlskrona: Blekinge Tekniska Högskola
Open this publication in new window or tab >>Measurements, Analysis Techniques and Experiments in Sound and Vibration: Applied to Operational MRI Scanners and in Remote Laboratories.
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

High quality noise and vibration measurements outside of a laboratory environment on real life structures and applications are not trivial. True boundary and operating conditions enforce unique challenges on the measurements. Measurements in hazardous situations such as high magnetic fields, and high temperature environments, etc., where ordinary measurement equipment and methods may not be employed, require further precautions. Post measurements objectives such as analysis, design and strategic decisions, e.g., control, rely heavily on the quality and integrity of the measurements (data).

The quality of the experimental data is highly correlated with the on-field expertise. Practical or hands-on experience with measurements can be imparted to prospective students, researchers and technicians in the form of laboratory experiments involving real equipment and practical applications. However, achieving expertise in the field of sound and vibration measurements in general and their active control in particular is a time consuming and expensive process. Consequently most institutions can only afford a single setup, resulting in the compromise of the quality of expertise.

In this thesis, the challenges in the field of sound and vibration measurements in high magnetic field are addressed. The analysis and measurement of vibration transferred from an operational magnetic resonance imaging (MRI) scanner to adjacent floors is taken as an example. Improvised experimental measurement methods and custom-made frequency analysis techniques are proposed in order to address the challenges and study the vibration transfer. The methods may be extended to other operational industrial machinery and hazardous environments. To encourage and develop expertise in the field of acoustic/vibration measurements and active noise control on practical test beds, remotely controlled laboratory setups are introduced. The developed laboratory setup, which is accessed and controlled via the Internet, is the first of its kind in the active noise control and acoustic measurements area. The laboratory setup can be shared and utilized 24/7 globally, thus reducing the associated costs and eliminating time restrictions.

Place, publisher, year, edition, pages
Karlskrona: Blekinge Tekniska Högskola, 2017. p. 251
Series
Blekinge Institute of Technology Doctoral Dissertation Series, ISSN 1653-2090 ; 3
Keywords
Active Noise Control, Remote Laboratories, Sound and Vibration Measurements, Vibration Analysis, Vibration Transmission
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-13821 (URN)978-91-7295-336-9 (ISBN)
Public defence
2017-02-22, 10:00 (English)
Opponent
Supervisors
Available from: 2017-02-01 Created: 2017-01-24 Last updated: 2017-10-25Bibliographically approved
Imran, k. (2017). MRI Scanner’s Vibration Isolation: Experimental Measurements, Analysis Techniques and Analytical Models.
Open this publication in new window or tab >>MRI Scanner’s Vibration Isolation: Experimental Measurements, Analysis Techniques and Analytical Models
2017 (English)Report (Other academic)
Abstract [en]

Modern Magnetic Resonance Imaging (MRI) scanners employ techniques for faster switching of currentsin the gradient coils. The aim is to improve the imaging quality and/or shorter scanning time at thecost of further escalating the associated vibration and noise excited by the Lorentz forces in the gradientcoil. These developments necessitate the employment of effective vibration isolation measures, both priorand post installation, for which a comprehensive analysis of the vibration transfer paths is essential. Such ananalysis is presented in this paper for an operational MRI scanner. The vibration transfer paths are studiedboth analytically and experimentally. Based on the spectral analysis results, improvements in the existingvibration isolation mechanism are discussed.

Publisher
p. 47
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-13852 (URN)
Available from: 2017-01-31 Created: 2017-01-31 Last updated: 2017-02-06Bibliographically approved
Khan, I., Claesson, L. & Håkansson, L. (2016). Performing active noise control and acoustic experiments using real test setup via the Internet. In: Proceedings of 2016 13th International Conference on Remote Engineering and Virtual Instrumentation, REV 2016: . Paper presented at 13th International Conference on Remote Engineering and Virtual Instrumentation, REV 2016; Madrid (pp. 375-376). IEEE Press
Open this publication in new window or tab >>Performing active noise control and acoustic experiments using real test setup via the Internet
2016 (English)In: Proceedings of 2016 13th International Conference on Remote Engineering and Virtual Instrumentation, REV 2016, IEEE Press, 2016, p. 375-376Conference paper, Published paper (Refereed)
Abstract [en]

In In this demo session, it will be shown how to perform Active Noise Control (ANC) and various important Acoustic experiments remotely on the remotely controlled ANC laboratory developed by Blekinge Institute of Technology, Sweden. An important consideration in ANC is the active control’s performance dependence on the spatial position of the reference and error sensors, etc. This will be highlighted particularly. This feature is recently implemented using stepper motors which can be controlled via the Internet. It will be demonstrated how to write and upload active noise control algorithms e.g. Filtered-X Least Mean Square (FXLMS) to a digital signal processors (DSP) board. For the acoustic experiments various interesting acoustic properties such as waveforms, speed of sound, mode shapes and sound pressure spectra may be measured. A short guide about the measurements and PowerPoint presentation will be provided during the demo to facilitate for the users. The Lab setup and the equipment will be shown to the user using Skype and a web camera.

Place, publisher, year, edition, pages
IEEE Press, 2016
Series
nternational Conference on Remote Engineering and Virtual Instrumentation, ISSN 2330-9997
Keywords
Acoustic properties; Acoustic variables control; Active noise control; Algorithms; Digital signal processors; Internet; Signal processing; Stepping motors, Acoustic experiments; Acoustic measurements; Active noise control (ANC); Digital signal processors (DSP); Filtered x least mean squares; Power Point presentations; Remote labs; Spatial positions, Acoustic noise
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-13141 (URN)10.1109/REV.2016.7444506 (DOI)000382146400077 ()2-s2.0-84966632285 (Scopus ID)978-146738246-5 (ISBN)
Conference
13th International Conference on Remote Engineering and Virtual Instrumentation, REV 2016; Madrid
Note

Conference of 13th International Conference on Remote Engineering and Virtual Instrumentation, REV 2016 ; Conference Date: 24 February 2016 Through 26 February 2016; Conference Code:121080

Available from: 2016-10-04 Created: 2016-10-03 Last updated: 2016-11-08Bibliographically approved
Khan, I., Nygren, Å. & Håkansson, L. (2015). CHALLENGES IN FULFILLING THE INTENDED LEARNING OUTCOMES OF REMOTE LABORATORIES: A CASE STUDY OF ACTIVE NOISE CONTROL AND ACOUSTIC REMOTE LABORATORY.. In: Crocker, MJ Pawelczyk, M Pedrielli, F Carletti, E Luzzi, S (Ed.), PROCEEDINGS OF THE 22ND INTERNATIONAL CONGRESS ON SOUND AND VIBRATION: MAJOR CHALLENGES IN ACOUSTICS, NOISE AND VIBRATION RESEARCH, 2015. Paper presented at 22nd International Congress on Sound and Vibration (ICSV), Florence. INT INST ACOUSTICS & VIBRATION
Open this publication in new window or tab >>CHALLENGES IN FULFILLING THE INTENDED LEARNING OUTCOMES OF REMOTE LABORATORIES: A CASE STUDY OF ACTIVE NOISE CONTROL AND ACOUSTIC REMOTE LABORATORY.
2015 (English)In: PROCEEDINGS OF THE 22ND INTERNATIONAL CONGRESS ON SOUND AND VIBRATION: MAJOR CHALLENGES IN ACOUSTICS, NOISE AND VIBRATION RESEARCH, 2015 / [ed] Crocker, MJ Pawelczyk, M Pedrielli, F Carletti, E Luzzi, S, INT INST ACOUSTICS & VIBRATION , 2015Conference paper, Published paper (Refereed)
Abstract [en]

The learning outcomes or educational objectives (goals) of a remote controlled laboratory via the Internet is the subject of discussion in this paper. The developers of remote laboratories are often self motivated individuals or academic groups, who only focus on development, accessibility and usability of their laboratories. The key question i.e. the intended learning outcomes or educational goals of a remotely controlled laboratory are frequently ignored or simply not given enough priority to be considered. This may lead to under utilization or complete failure of a particular remote laboratory. In this paper the challenges in formulating and achieving the educational objectives of a remotely controlled active noise control and acoustics laboratory are discussed.

Place, publisher, year, edition, pages
INT INST ACOUSTICS & VIBRATION, 2015
National Category
Educational Sciences Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:bth-15761 (URN)000398997007007 ()
Conference
22nd International Congress on Sound and Vibration (ICSV), Florence
Available from: 2018-01-16 Created: 2018-01-16 Last updated: 2018-01-19Bibliographically approved
Sharafi, A., Khan, I., Zackrisson, J. & Håkansson, L. (2014). Development and Implementation of an Ad-vanced Remotely Controlled Vibration Laboratory. In: proceedings of REV 2014 International Conference on Remote Engineering and Virtual Instrumentation: . Paper presented at International Conference on Remote Engineering and Virtual Instrumentation (REV), Porto, Portugal. IEEE Computer Society
Open this publication in new window or tab >>Development and Implementation of an Ad-vanced Remotely Controlled Vibration Laboratory
2014 (English)In: proceedings of REV 2014 International Conference on Remote Engineering and Virtual Instrumentation, IEEE Computer Society, 2014Conference paper, Published paper (Refereed)
Abstract [en]

Currently an advanced remotely controlled vibration laboratory is developed and implemented at Blekinge Institute of Technology, Karlskrona, Sweden. The new developments in the laboratory setup will provide users to carry out vibration measurements on a cantilever beam system with remotely adjustable dynamic properties and to estimate dynamic characteristics of it. The dynamic properties of the cantilever beam are remotely modified by attaching structural parts such as a block of mass, a spring mass system and a non-linear spring. In the development of this remote-lab, a number of different approaches were adopted for the production of well-defined experiments. Also, the new prototype laboratory is designed based on finite elements modeling (FEM) and LABVIEW. The test object, attachment mechanism for sub structures, relevant experiments, and proper interface for managing the lab via Internet and many other things have been considered.

Place, publisher, year, edition, pages
IEEE Computer Society, 2014
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:bth-11946 (URN)10.1109/REV.2014.6784193 (DOI)
Conference
International Conference on Remote Engineering and Virtual Instrumentation (REV), Porto, Portugal
Available from: 2016-06-01 Created: 2016-06-01 Last updated: 2016-06-02Bibliographically approved
Khan, I., Zmuda, M., Konopka, P., Gustavsson, I. & Håkansson, L. (2014). Enhancement of remotely controlled laboratory for Active Noise Control and acoustic experiments. In: : . Paper presented at International Conference on Remote Engineering and Virtual Instrumentation (REV), Porto (pp. 285-290). IEEE
Open this publication in new window or tab >>Enhancement of remotely controlled laboratory for Active Noise Control and acoustic experiments
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2014 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The latest important developments in the remotely controlled Active Noise Control (ANC) and Acoustics laboratory at Blekinge Institute of Technology (BTH), Sweden, are introduced. The remotely controlled laboratory is based on the Virtual Instruments Systems in Reality (VISIR) concept, and concerns multi-channel measurement and control of the sound field in a heating ventilation and air conditioning (HVAC) duct. Originally the ventilation duct was equipped with a fixed number of microphones at fixed spatial locations in the duct. A microphone positioning system has been designed and implemented. It enables control of the spatial positions of a number of microphones inside the HVAC duct using a suitable web interface for controlling stepper motors via a National Instruments (NI) PXI system. With the new developments, the spatial number of selectable positions for the microphones have been extended substantially. The new microphone positioning control system is presented and to enhance the user interaction with the laboratory equipment, an audio and visual system is also proposed.

Place, publisher, year, edition, pages
IEEE, 2014
Series
International Conference on Remote Engineering and Virtual Instrumentation, ISSN 2330-9997
Keywords
Acoustics, Active noise control, Remote control laboratories, VISIR
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-6546 (URN)10.1109/REV.2014.6784276 (DOI)000353337400058 ()978-1-4799-2024-2 (ISBN)
External cooperation:
Conference
International Conference on Remote Engineering and Virtual Instrumentation (REV), Porto
Available from: 2014-11-20 Created: 2014-11-20 Last updated: 2017-01-31Bibliographically approved
Khan, I., Maciej, Z., Konopka, P. & Håkansson, L. (2014). REMOTE CONTROL OF ACTIVE NOISECONTROL AND AOCUSTICS EXPERIMENT SETUP VIA THE INTERNET. In: : . Paper presented at ICSV21 - The Twenty First International Congress on Sound and Vibration, Beijing.
Open this publication in new window or tab >>REMOTE CONTROL OF ACTIVE NOISECONTROL AND AOCUSTICS EXPERIMENT SETUP VIA THE INTERNET
2014 (English)Conference paper, Published paper (Other academic)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:bth-11947 (URN)
Conference
ICSV21 - The Twenty First International Congress on Sound and Vibration, Beijing
Available from: 2016-06-01 Created: 2016-06-01 Last updated: 2016-06-02Bibliographically approved
Khan, I., Gertsovich, I., Claesson, I., Håkansson, L., Johansson, P.-E., Wirenstedt, M., . . . Petersson, S. (2013). MRI SCANNER VIBRATION PATH ANALYSIS. In: Machinery Noise and Vibration: . Paper presented at The 20th International Congress on Sound and Vibration (ICSV20), Bangkok. , Article ID 725.
Open this publication in new window or tab >>MRI SCANNER VIBRATION PATH ANALYSIS
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2013 (English)In: Machinery Noise and Vibration, 2013, article id 725Conference paper, Published paper (Other academic)
Abstract [en]

Magnetic Resonance Imaging (MRI) scanner is one of the most important tools in clinical diagnostics. MRI scanners are associated by strong vibration which results in unpleasant and disturbing acoustic noise. The primary source of this vibration is the Lorentz force produced by fast switching of the currents inside the gradient coils of MRI scanners under a strong static magnetic field. During an MR-imaging scan the switching is controlled in order to spatially code the hydrogen nuclei that will generate the signal, which is reconstructed into anatomical images. Faster switching of the currents allows for shorter scan times and/or higher image resolutions. Consequently, the clinical quality has motivated the drive for shorter switching time and higher currents. This development, however, has also caused an undesired increase of MRI vibrations. The overall vibration phenomenon of an installed fully functional MRI scanner system becomes unique because of the installed location and ambiance. This vibration can potentially degrade the image quality and hence the diagnosis. Apart from the vibration produced, the associated annoying acoustic noise may not only affect the patients under examination and the clinical staff, but may also be transmitted to other parts of the building and causing discomfort for the personnel working there. In order to devise an effective isolation plan or improve an existing one both for vibration and acoustic noise it is important to study the noise and vibration transfer paths. This paper concerns an investigation of vibration transfer paths for vibration excited by an installed functional MRI scanner at a medical facility. The vibration transfer paths have been investigated experimentally. The obtained results are presented and discussed.

National Category
Signal Processing
Identifiers
urn:nbn:se:bth-13808 (URN)
Conference
The 20th International Congress on Sound and Vibration (ICSV20), Bangkok
Available from: 2017-01-22 Created: 2017-01-22 Last updated: 2018-05-22Bibliographically approved
Khan, I., Muhammad, M., Rabbani, M. S., Johansson, S. & Håkansson, L. (2013). Performance evaluation of control algorithms implemented on a remotely controlled active noise control laboratory. In: Active Noise and Vibration Control in Practical System Implementations: . Paper presented at The 20th International Congress on Sound and Vibration (ICSV20).. , Article ID 731.
Open this publication in new window or tab >>Performance evaluation of control algorithms implemented on a remotely controlled active noise control laboratory
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2013 (English)In: Active Noise and Vibration Control in Practical System Implementations, 2013, article id 731Conference paper, Published paper (Other academic)
Abstract [en]

The remotely controlled laboratory setup for Active Noise Control (ANC) developed by Blekin-ge Institute of Technology, Sweden provides an efficient learning platform for the students to implement and learn ANC algorithms with real world physical system, hardware and signals. The initial laboratory prototype based on a Digital Signal Processor (DSP) TMS320C6713 from Texas Instruments (TI) was successfully tested with Filtered-x Least Mean Square (F-XLMS) algorithm applied to control noise in a ventilation duct. The resources of the DSP platform used in the remote laboratory setup enable testing and investigating substantially more challenging and computationally demanding algorithms. In this paper, we expand the horizon of the laboratory setup by testing more advanced and complicated single channel feed forward ANC algorithms. Filtered-x versions of algorithms such as the normalized least mean square (N-LMS), leaky least mean square (L-LMS), Filtered-U recursive least mean square (FURLMS) and recursive least square (RLS) algorithm etc. have been implemented utilizing the remote web based client provided in the remote laboratory. A comprehensive performance comparison of the aforementioned algorithms for the remote laboratory setup is presented to demonstrate the viability of the remote laboratory.

National Category
Signal Processing
Identifiers
urn:nbn:se:bth-13809 (URN)
Conference
The 20th International Congress on Sound and Vibration (ICSV20).
Available from: 2017-01-22 Created: 2017-01-22 Last updated: 2018-05-22Bibliographically approved
Khan, I., Moazzam, M., Rabbani, S., Johansson, S. & Håkansson, L. (2013). PERFORMANCE EVALUATION OF CONTROL ALGORITHMS IMPLEMENTED ON A REMOTELY CONTROLLEDACTIVE NOISE CONTROL LABORATORY. In: : . Paper presented at ICSV20 - The Twentieth International Congress on Sound and Vibration, Bangkok.
Open this publication in new window or tab >>PERFORMANCE EVALUATION OF CONTROL ALGORITHMS IMPLEMENTED ON A REMOTELY CONTROLLEDACTIVE NOISE CONTROL LABORATORY
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2013 (English)Conference paper, Published paper (Other academic)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:bth-11944 (URN)
Conference
ICSV20 - The Twentieth International Congress on Sound and Vibration, Bangkok
Available from: 2016-06-01 Created: 2016-06-01 Last updated: 2016-06-02Bibliographically approved
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