Events: Signaler och system, Electrical Engineering events at Chalmers University of TechnologyFri, 21 Sep 2018 09:35:07 +0200 lecture by Hana Dobsicek Trefna<p>ED lecture hall, Hörsalsvägen 11</p><p>Title of talk: &quot;Microwave hyperthermia, an emergent weapon in the war on cancer</p><h2 class="chalmersElement-H2">​Abstract of talk</h2> <div>In my lecture I will describe the role of hyperthermia in today’s cancer treatment, as well as giving a future outlook on the potentials for the method to become the fourth pillar of cancer care. Hyperthermia is defined as controlled elevation of tumor temperature to 40-44°C. This treatment is toxic for the tumor itself, whilst also making the tumor more sensitive to traditional chemo and radiation therapies. The major technological challenge is, due to the large wavelengths and high absorption rates in tissues, to achieve and accurately predict high temperatures in deep-seated tumors without heating the surrounding healthy tissues.<br /></div>,-Electrical-Engineering.aspx,-Electrical-Engineering.aspxChenjie Ge, Electrical Engineering<p>EDIT room, 3364</p><p>​Half Way Seminar</p><p>​</p> <p>Chenjie Ge is a PhD student at <span style="font-size:14px;font-family:&quot;open sans&quot;, sans-serif;white-space:normal;word-spacing:0px;text-transform:none;float:none;font-weight:300;font-style:normal;text-align:left;orphans:2;widows:2;display:inline !important;letter-spacing:normal;text-indent:0px">Signal processing and Biomedical engineering</span></p> <p>Examiner is Professor Irene Gu <span style="font-size:14px;font-family:&quot;open sans&quot;, sans-serif;white-space:normal;word-spacing:0px;text-transform:none;float:none;font-weight:300;font-style:normal;text-align:left;orphans:2;widows:2;display:inline !important;letter-spacing:normal;text-indent:0px">at Signal processing and Biomedical engineering</span></p> He, MPEPO<p>Fredrik Lamm, meeting room, Hörsalsvägen 11</p><p>​A comparison of modulation techniques and motor performance evaluation</p><div><br /></div> <div>Examiner: Torbjörn Thiringer</div> <div>Conducted at Volvo Cars supervised by Andreas Andersson.</div> <div>Opponent: Changxin Yang<br /></div> <div><strong><br /></strong></div> <div><strong>Abstract</strong><br /></div> <div><br /></div> <div>​In this thesis, several modulation techniques are implemented in a permanent magnet synchronous machine (PMSM) field-oriented control (FOC) drive system. Among them, third-harmonic injection PWM (THIPWM), space vector modulation (SVM) and discontinuous PWM (DPWM) show distinct behaviors in the system. Key parameters of the machine as well as the inverter are compared and evaluated. Current harmonics, inverter losses, inverter efficiency and switching frequency are included in the evaluation.</div> <br />Primarily, phase current total harmonic distortion (THD) is analyzed using either manual FFT or Powergui toolbox. The result shows that 1/6 THIPWM has more harmonics components than 1/4 THIPWM in most of the speed-torque map area. Continuous PWM (CPWM) is proved to have higher linearity than DPWM in general under the same switching frequency. For DPWM, THD decreases in the following order: DPWM0, DPWM1, DPWMMAX/DPWMMIN, DPWM3, DPWM2. For CPWM, the order is: 1/6 THIPWM, SVM, 1/4 THIPWM. However, DPWM2 can achieve even lower THD performance than CPWM in the high-speed region. In the low speed region, CPWM is still favorable.<br /> <br />Next, for inverter conduction losses, each method does not differ much. While for switching losses, DPWM has an advantage over CPWM and each DPWM method has a different characteristic in relationship with the phase angle. When the load phase angle is around zero, i.e., in the high power factor region, DPWM1 has the lowest switching loss. When the phase angle is relatively large and positive, i.e., mostly in the non-field-weakening region in the speed-torque map, DPWM2 shows the lowest switching loss. When the phase angle is relatively large but negative, i.e., mostly in the field-weakening region, DPWM0 has the best switching loss performance. Low switching losses lead to high inverter efficiency.<br /> <br />Furthermore, ECE and EUDC driving cycles are applied to test the invert performance in a real-life scenario. Neural network curve fitting and interpolation are both involved in the investigation. Total energy losses are compared between SVM and DPWM for two driving cycles. Moreover, a comparison based on switching frequency variation is made to show how switching frequency affects inverter losses.<br /> seminar with Claudia Eckert<p>EDIT room, floor 3, EDIT building, Hörsalsvägen 11, Campus Johanneberg</p><p>​Welcome to a WiSE lunch seminar with the Chalmers Jubilee Professor Claudia Eckert!</p>​<div><span style="background-color:initial">Jubilee Professor Claudia Eckert works at the Department of Design, Development, Environment and Materials at the Open University (UK) and is currently hosted by Chalmers in the research group of Systems Engineering Design at the Department of Industrial and Materials Science.</span><div><br /></div> <div>At this WiSE lunch seminar, Claudia will talk about her research as well as how her multi-disciplinary background, and being a woman, has helped her.</div> <div><br /></div> <div><strong>Industry Trends to 2040</strong><br /></div> <div>&quot;We live in socially and politically uncertain times. Sustainability is becoming an ever more pressing issue. The European Union and others have conducted multiple studies of societal and technological trends. However, much less is known about what this means for how engineering companies work and how we as universities support them through our teaching and research. This talk reports on the findings of a workshop with over 40 participants from industry and academia and 10 preliminary interviews with experienced engineering designers and design managers from Sweden, the UK, Germany and Ireland.&quot;</div> <div><br /></div> <div>During the seminar, we offer lunch to participants who<strong> r</strong><strong><strong>e</strong>gister before 15:00 on 21 September</strong>. The seminar is open to everyone with an interest in female rolemodels within academia - especially from Chalmers, Gothenburg University, Borås University, MedTech West and the Sahlgrenska Academy.<br /></div> <div><br /></div> <div><a href=";utm_source=email&amp;utm_medium=email" target="_blank"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/icgen.gif" alt="" />Register here</a></div></div> <div><br /></div> <div><img src="/SiteCollectionImages/Institutioner/E2/Kalendarium/WiSE/WiSE_250px.jpg" class="chalmersPosition-FloatLeft" alt="" style="margin:5px" /><br /><br />WiSE - Women in Science - aims to create a supportive network for young female researchers during their academic career. WiSE is a joint project between MedTech West and the department of Electrical Engineering at Chalmers University of Technology.<br /><a href="/en/departments/e2/network/wise/Pages/default.aspx"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/ichtm.gif" alt="" />Read more about WiSE​</a></div>,-Electrical-Engineering.aspx,-Electrical-Engineering.aspxAnton Klintberg, Electrical Engineering<p>ED, lecture hall,</p><p>​​Title of thesis: On State and Parameter Estimation for Aged Battery Cells</p><p> </p> <p>​Anton Klintberg is a PhD student in the <span style="font-size:14px;font-family:&quot;open sans&quot;, sans-serif;white-space:normal;word-spacing:0px;text-transform:none;float:none;font-weight:300;font-style:normal;display:inline !important;letter-spacing:normal;text-indent:0px">Automatic control group</span></p> <p><span style="font-size:14px;font-family:&quot;open sans&quot;, sans-serif;white-space:normal;word-spacing:0px;text-transform:none;float:none;font-weight:300;font-style:normal;display:inline !important;letter-spacing:normal;text-indent:0px">Discussion leader is Professor Erik Frisk from Linköping University</span></p> <p><span style="font-size:14px;font-family:&quot;open sans&quot;, sans-serif;white-space:normal;word-spacing:0px;text-transform:none;float:none;font-weight:300;font-style:normal;display:inline !important;letter-spacing:normal;text-indent:0px">Examiner is Professor Torsten Wik from the <span style="font-size:14px;font-family:&quot;open sans&quot;, sans-serif;white-space:normal;word-spacing:0px;text-transform:none;float:none;font-weight:300;font-style:normal;display:inline !important;letter-spacing:normal;text-indent:0px">Automatic control research group</span></span></p>,-Electrical-Engineering.aspx,-Electrical-Engineering.aspxGiuseppe Giordano, Electrical Engineering<p>HC4, lecture hall,</p><p>​Inference techniques for stochastic nonlinear system identification with applications to the Wiener-Hammerstein models</p><p>​</p> <p>Giuseppe Giordano is a PhD student <span style="font-size:14px;font-family:&quot;open sans&quot;, sans-serif;white-space:normal;word-spacing:0px;text-transform:none;float:none;font-weight:300;font-style:normal;orphans:2;widows:2;display:inline !important;letter-spacing:normal;text-indent:0px"><span> </span>in the Mechatronics research group</span></p> <p>Faculty Opponent is Professor Roy Smith from Automatic Control Laboratory, Department of Electrical Engineering, ETH Zurich</p> <p>Examiner is Jonas Sjöberg, Chalmers</p> lecture by Ashraf Uz Zaman<p>EL43 lecture room, Maskingränd 2</p><p>​In connection with his promotion to Docent, Ashraf Uz Zaman from the division Communications and antenna Systems, will hold a lecture titled &quot;Towards Next Generation Low-loss Integrated Planar Antenna Solutions for mmWave Wireless Systems</p><h2 class="chalmersElement-H2">​Abstract of talk</h2> <p>With the demanding system requirements for the fifth-generation (5G) wireless communications and the severe spectrum shortage at conventional cellular frequencies, antenna systems operating in the millimeter-wave frequency bands have attracted a lot of research interest. From the system point of view, antenna is one key component which is responsible to a great extent for the efficiency and power budget of RF systems. At millimeter-wave frequencies, power generation issues and noise are much more pronounced, which are closely related to the integration loss, efficiency of the antennas and other RF components. </p> <p>Although high antenna efficiency can be obtained by using dielectric lens antennas or reflector antennas, it is difficult to realize planar profile with such configurations, as they essentially need focal spatial length. The conventional low-cost planar structures such as microstrip lines and coplanar waveguide (CPW), which are common for the design of planar antennas, cannot be readily used for millimeter-wave and sub-millimeter wave applications due to high transmission losses in the dielectric material, spurious radiation losses, complicated packaging issue, thermal management etc. </p> <p>Based on the above considerations, it is implied that existing millimeter-wave antenna technologies have limitations with respect to manufacturing cost, efficiency, bandwidth and mechanical simplicity, giving an opportunity for more research work on new millimeter wave technologies such as Substrate Integrated Waveguide, Gap waveguide etc. During this presentation, several gap waveguide based integrated antenna solutions for future cellular base stations (28GHz) and back-hauling (E-band, D-band) will be discussed with a focus on millimeter wave electronics and filter integration. Due to the low loss properties of gap waveguide, high efficiency and integrated planar antennas can be designed with this technology. Also, the inherent mechanical flexibility of gap waveguide technology can allow low cost manufacturing techniques such as plastic injection molding, metal die casting, polymer micromachining etc. for millimeter wave antenna mass production.</p>–-Using-AI-and-IT-to-support-the-healthcare-staff-and-their-patients.aspx care – Using AI and IT to support the healthcare staff and their patients<p>Kammaren, Vita stråket 12, Sahlgrenska Universitety Hospital, Gothenburg</p><p>​Wel​come to a MedTech West seminar with Kristofer Bengtsson from the Automation reseatrch group, Department of Electrical Engineering at Chalmers.</p><span style="background-color:initial"><br />It is a challenge to keep track of everything that is going on at an Emergency Department (ED). The always changing situation and the constant interruptions can make the work stressful and reactive. To become more proactive, limit the feeling of chaos and increase patient focus, it is necessary to get an overview and understanding of the current situation as well as the coming hours. Based on his work at the ED at NÄL in Trollhättan and the prototype tool Sequence Planner, Kristofer Bengsson believes that it is possible for an ED (or any type of care unite) to become proactive and dynamic. The tools and algorithms that are currently begin developed helps the staff to focus on the plan for each patient using smart process monitoring and visualization, AI to predict the coming workload, and flexible and proactive process scheduling. In this talk, Kristofer will present their results and share his experience from working with AI research at a hospital.</span><div><br /></div> <div><strong>Kristofer Bengtsson</strong> received his Ph.D. degree in Systems and Control from the Chalmers University of Technology in 2012. He has a background in developing real-time control and automation systems before starting his academic career. Currently he is working with control and optimization of automation systems, intelligent and collaborative robots as well as AI and IT support for proactive care.</div> <div><br /></div> <div><a href="" target="_blank"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/icgen.gif" alt="" />Register here​</a></div> Andersson, Electrical Engineering<p>ED, Hörsalsvägen 11</p><p>​Title of thesis: Electric Machine Control for Energy Efficient Electric Drive Systems</p>​<span style="background-color:initial">Andreas Andersson is an industrial PhD student at the division Electric Power Engineering</span><div><span style="background-color:initial"></span><div>Opponent is Professor Mats Alaküla, Lund institute of Technology / AB Volvo </div> <div>Examiner is Professor Torbjörn Thiringer <span style="background-color:initial">at the d</span><span style="background-color:initial">ivision</span><span style="background-color:initial"> </span><span style="background-color:initial">Electric Power Engineering</span></div> <h2 class="chalmersElement-H2">Abstract</h2> <div><div>Over the past decade, electric vehicles have increasingly become an area of attention for both academia and industry, much due to challenges such as emissions legislation and the environmental impact of the transportation sector. The absence of the broadband noise from the internal combustion engine brings new acoustic challenges for electric propulsion applications. Magnetic noise from electrical machines is of particular interest in automotive applications. It is not only related to the geometrical design of the machine, but also to the selection of control approach and voltage modulation strategy. </div> <div>            </div> <div>This thesis focuses primarily on software-based electric drive system energy efficiency enhancements, supported by extensive experimental testing, incorporating aspects of dynamic performance and acoustic perspectives. The scientific contribution can be summarized in three parts. Firstly, the interdisciplinary research where efficiency enhancements are coupled to acoustic performance. Secondly, the cause and effect of electromagnetic forces as the link between machine design, controls, and perceived acoustic annoyance. Lastly, the findings from the research on optimization-based inverter control and motion sensorless operation. </div> <div>            </div> <div>It is proven that alternative modulation techniques can reduce the inverter losses with up to 15 % without degradation of the perceived acoustic annoyance. Moreover, research on finite control set model predictive current control and moving horizon rotor position estimation is presented. It is shown that the proposed solutions are feasible, and that the associated optimization problems at hand can be solved in real-time while exploiting their respective attractive properties. Furthermore, excellent performance is obtained in comparison to state of the art alternatives, at the expense of increased computational complexity.<span style="background-color:initial">​</span></div></div> </div> Jutsell Nilsson, Electrical Engineering<p>EB, lecture hall, Hörsalsvägen 11</p><p>Title of thesis: Electrical detection of degradation in specimens of HVDC cable insulation</p>​Douglas Jutsell Nilsson is a PhD student from Electric Power Engineering, reseach group Power Grids and Components<br /><div>Discussion leader is Professor Tord Bengtsson, from ABB Corporate Research, Västerås<br /></div> <div>Examiner is Professor Stanislaw Gubanski <span style="background-color:initial">from Electric Power Engineering</span><span style="background-color:initial">, reseach group Power Grids and Components​</span></div> <h2 class="chalmersElement-H2"><span>Abstract​</span></h2> <div><span><div>One of the challenges in laboratory investigation of degradation and ageing of HVDC cable insulation is related to securing, or in other words, imitating the real service environment of the material specimens. So far, the published data refer to experiments conducted in thermo-oxidative conditions, which is not the case during normal cable operation. In reality the cable insulation is protected by a metallic barrier that blocks the transfer of any substances in and out of the construction. By-products from the cross-linking reactions cannot diffuse out and any foreign substances, such as oxygen and water, are blocked from entering into the insulation. Thus, in order to generate results that are valid, these conditions must be replicated in laboratory experiments. </div> <div><br /></div> <div>This contribution presents a measuring system elaborated for performing ageing experiments in a hermetically sealed environment. The material degradation is evaluated through measurements of changes in the electrical tree inception voltage and test object capacitance over time. Securing the environmental isolation is primarily accomplished with an isolation system consisting of a glass enclosure with attached metallic electrodes. Indium is used to create a glass-to-metal seal between the glass and the electrodes. The electrode geometry is of needle-plane type and the needle injection process is semi-automated to secure a large degree of repeatability in specimen preparation. Voltage can be applied to this arrangement to either the needle or the plane electrodes. </div> <div><br /></div> <div>During electrical tree inception voltage experiments, four synchronized data streams are recorded continuously. The voltage applied to the specimen, the voltage developed over a reference impedance connected in series with the specimen, a video stream observing the tip of the needle and finally the signal from an external conventional PD-circuit. This allows for three separate indicators of the inception voltage: changes in the sample impedance, optical observation and PD-activity.</div></span></div> <p class="MsoNormal"><span lang="EN-US" style="font-size:11pt;color:black"></span></p> Vosoogh, Electrical Engineering<p>EC, lecture hall, Hörsalsvägen 11</p><p>Title of thesis: Compact RF Integration and Packaging Solutions Based on Metasurfaces for Millimeter-Wave Applications</p><div><div>Abbas Vosoogh is a PhD student in the Antenna Systems research group<br /><div>Faculty opponent: Professor Antti Räisänen, Department of Electronics and Nanoengineering, Aalto University,</div> <div>Finland​</div></div> <div><span style="background-color:initial"><div>Examiner: Professor Jian Yang, Chalmers​</div> <div><br /></div> <h2 class="chalmersElement-H2">Abstract​​​</h2> <div><div>The millimeter-wave frequency range has got a lot of attention over the past few years because it contains unused frequency spectrum resources that are suitable for delivering Gbit/s end-user access in areas with high user density. Due to the limited output power that the current RF active components can deliver in millimeter-wave frequencies, antennas with the features of low profile, high gain, high efficiency and low cost are needed to compensate free space path loss and increase the communication distance for the emerging high data rate wireless systems. Moreover, it is desired to have a compact system by integration of the antenna with passive and active components at high frequencies.</div> <div><br /></div> <div>In order to move towards millimeter-wave frequencies we need to face significant hardware challenges, such as active and passive components integration, packaging problems, and cost-effective manufacturing techniques. The gap waveguide technology shows interesting characteristics as a new waveguide structure. The main goal of this thesis is to demonstrate the advantages of gap waveguide technology as an alternative to the traditional guiding structures to overcome the problem of good electrical contact due to mechanical assembly with low loss. This thesis mainly focuses on high-gain planar array antenna design, integration with passive and active components, and packaging based on gap waveguide technology.  We introduce several low-profile multilayer corporate-fed slot array antennas with high gain, high efficiency and wide impedance bandwidth operating at the millimeter-wave frequency band. A system demonstration consisting of two compact integrated antenna-diplexer and Tx/Rx MMICs for Frequency-division duplex (FDD) low latency wireless backhaul links at E-band is presented to show the advantages of gap waveguide technology in building a complete radio front-end. Moreover, the use of several new manufacturing methods, such as die-sink Electric Discharge Machining (EDM), direct metal 3-D printing, and micro-molding are evaluated to fabricate gap waveguide components in a more effective way.</div> <div><br /></div> <div>Furthermore, a novel air-filled transmission line, so-called multi-layer waveguide (MLW), that exhibits great advantages such as low-cost, simple fabrication, and low loss, even for frequencies beyond 100 GHz, is presented for the first time. To constitute an MLW structure, a rectangular waveguide transmission line is formed by stacking several thin metal layers without any electrical and galvanic contact requirement among the layers. The proposed concept could become a suitable approach to design millimeter-wave high-performance passive waveguide components, and to be used in active and passive components integration ensuring mass production at the same time. A GaAs power amplifier (PA) is successfully packaged with this technology at W-band. Measurement results and experimental validation are provided for the presented designs demonstrating the great potential of this innovative technology.</div></div></span></div></div>,-Stefan-Pettersson.aspx,-Stefan-Pettersson.aspxInauguration lecture, Stefan Pettersson<p>EC, lecture hall, Hörsalsvägen 11, Campus Johanneberg</p><p>​Welcome to a lecture for the position Adjunct Professor at the Department of Electrical Engineering, held by Stefan Pettersson.</p>​<div><div><strong>Titel:</strong></div> <div>Collaborative academia-institute-industry/society electromobility research</div> <div><br /></div> <div><strong>Abstract:</strong></div> <div>Vehicles run on electricity have the potential to reduce carbon dioxide emissions from the transport sector. Furthermore, there will be no tail pipe emissions from the vehicle when run on electricity. Electricity can be generated in different ways and there is a great potential to produce it from renewable sources like wind, solar and water. Regardless of production, the flexibility of electricity generation ensures security of the energy and transportation system in the country, an advantage compared to be dependent on oil and carbon import from unstable countries.</div> <div>Even though there are several advantages of running vehicles on electricity, there are several hinders as well that need to be addressed which give rise to much research possibilities. Focus of the speech will be on successful electromobility projects including partners from academia-institute-industry/society, including control engineering examples but also projects spanning several research disciplines. The speech will also include ideas how academia and institute can collaborate better.</div></div> <div><br /></div> <div><strong>Short bio:</strong><br /></div> <div><img src="/SiteCollectionImages/Institutioner/s2/profilbilder/Stefan_Pettersson_170px.jpg" class="chalmersPosition-FloatRight" alt="" style="margin:5px" />Stefan Pettersson has a M.Sc. in Automation Engineering and a Ph.D. in Control Engineering and became an Associate Professor in Control Engineering at Chalmers University in 2004. During 2006-2009 Stefan worked in the automotive industry at Volvo Technology, mainly with the energy management of hybrid powertrains. Currently, Stefan is the Research Manager of the Electromobility application area at RISE Viktoria, and leads a group of more than twenty researchers. More than 30 projects are yearly performed, considering technology, behavior, business and society perspectives. Stefan is also responsible for the focus area of Energy and Environment for Mobility at RISE, discussing the industry needs and common projects from a fossil-free transport system perspective. Stefan became an adjunct Professor at Chalmers University of Technology in 2017, where he is part of the department council of Electrical Engineering discussing future research and possibilities.<br /></div> Sustainability Day 2018<p>Campus Johanneberg, mostly at Chalmers conference centre, Student Union Building</p><p>​Chalmers Sustainability Day is back - Tuesday 23 October 2018. This year’s theme is Good Health and Well-being.</p>​ <br /><div><h5 class="chalmersElement-H5">The programme is launched!</h5> <div>Chalmers Sustainability day will offer an exciting and vast programme, open to all Chalmers employees and students. </div> <div> </div></div> <div>Programme and registration: <a href="/en/about-chalmers/Chalmers-for-a-sustainable-future/sustainability-day2018/Pages/default.aspx">Chalmers Sustainability Day 2018</a></div> <br /><br /> Day Chase-On + GHz Centre<p>Palmstedtsalen, university building,</p><p>​You are invited to an exciting joint Centre Day, co-organised between the centre on antenna systems ChaseOn and the centre on wireless communication and sensor technologies GHz centre.​</p><p class="chalmersElement-P">​<span>The day will </span><span>include technical presentations of all collaborative research projects, an invited talk given by </span><span>Prof.</span><span> Sonia </span><span>Heemtra</span><span> from the Univ. of Eindhoven and lots of opportunities for mingling and networking with other peers, as well as a gala dinner as the icing on the cake.</span></p> <p></p> <p class="chalmersElement-P"> </p> <p></p> <p class="chalmersElement-P"> </p> <p class="chalmersElement-P"><span>Don’t miss the opportunity to get updated on what is happening at  the research forefront of these important technical areas.</span></p> <p class="chalmersElement-P"> </p> Laboratory Annual Seminar 2018<p>Virtual Development Laboratory, Chalmers Tvärgata 4C, Campus Johanneberg</p><p>Save the date for 2018&#39;s Wingquist Laboratory Annual Seminar on Digital Product Realization. We will get back with more info further on.</p>