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  • 101.
    Uebel, Karl
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Conceptual Design of Complex Hydromechanical Transmissions2017Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This thesis explores the conceptual design process of complex hydromechanical transmissions for mobile working machines. Efficient methods for design optimisation and controller development are presented to support the final concept selection.

    In the endeavour to develop new fuel-efficient driveline solutions for construction machines and off-road equipment new complex hydromechanical transmission concepts are being investigated. This pursuit is driven by stricter emission legislation, high fuel prices and a desire for a greener image both for customers and manufacturers. The trend towards more complex transmission architectures increases the need for more sophisticated product development methods. Complex multiple-mode transmissions are difficult to design and prototype and can be realised in a great number of architectures. By introducing a secondary energy storage in the machine the design space expands further for both hardware and software. There is accordingly a need for more reliable concept assessment in early design stages and the possibility to support concurrent engineering throughout the development process.

    Previous research on the design and development of hydromechanical transmissions has been limited to analysis of fixed concept designs or design optimization using very simple performance indicators. Existing methodologies for electrified on-road vehicles are not suitable for off-road working machines with hydromechanical transmissions and hydraulic energy storage.

    The proposed conceptual design process uses detailed quasi-static simulation models and targets to optimise the fuel efficiency of the specific machine specifications and operations. It is also shown how high-speed dynamic simulations can be used for controller development and hardware-in-the-loop simulations to support an efficient product design process. The methods are demonstrated for typical use cases targeting new transmission development for construction machines. Software control development is also treated using control optimisation and real-time simulation. Finally a novel hybrid hydromechanical motion system is presented for which an efficient design process is crucial to its end performance.

    Delarbeid
    1. Design Optimization of Complex Hydromechanical Transmissions
    Åpne denne publikasjonen i ny fane eller vindu >>Design Optimization of Complex Hydromechanical Transmissions
    2013 (engelsk)Inngår i: Journal of mechanical design (1990), ISSN 1050-0472, E-ISSN 1528-9001, Vol. 135, nr 9, s. 091005-1-091005-9Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Demands for higher fuel efficiency for off-highway applications motivate manufacturers to replace existing drive transmissions with more complex, high-efficiency transmissions. Increased intelligence and more advanced architectures are, however, more difficult to design and prototype. This leads to longer product development processes and a greater need for early product evaluation. The great variety of existing concepts also requires a methodology to support the choice of architecture. This paper proposes a design methodology for complex hydromechanical transmissions based on optimization. The main objective is to maximize energy efficiency and adapt the design to suit the typical operating behavior of the application. The methodology is also implemented on a multiple mode transmission concept sui for a heavy wheel loader application. It is shown that the design of the gearbox heavily influences the energy consumption and the necessity to use optimization when designing the gearbox.

    sted, utgiver, år, opplag, sider
    ASME Press, 2013
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-99379 (URN)10.1115/1.4024732 (DOI)000326172400006 ()
    Tilgjengelig fra: 2013-10-17 Laget: 2013-10-17 Sist oppdatert: 2017-12-06bibliografisk kontrollert
    2. Optimisation and Concept Sensitivity of Continuously Variable Hydromechanical Transmissions
    Åpne denne publikasjonen i ny fane eller vindu >>Optimisation and Concept Sensitivity of Continuously Variable Hydromechanical Transmissions
    2013 (engelsk)Konferansepaper, Oral presentation only (Annet vitenskapelig)
    Abstract [en]

    Demands for better fuel efficiency for mobile working machines motivate the manufacturers to replace existing drive transmissions with more complex, high-efficiency transmissions. Hydromechanical power-split transmissions can offer high energy efficiency throughout the speed range and allows a decoupling of the speed of the combustion engine and the vehicle speed. This paper deals with the design of complex hydromechanical power-split transmissions and suggests an optimisation-based design methodology to minimise the energy consumption and manufacturing cost of the gearbox. The methodology is applied to a multiple mode power-split transmission which is designed to suit the requirements and typical operating behaviour of a heavy wheel loader. It is shown how important the design of the transmission is to its characteristics and how manufacturing costs can be weighed against energy efficiency.

    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-99380 (URN)
    Konferanse
    8th International Conference on Fluid Power Trans- mission and Control, April 9-11, Hangzhou, China
    Tilgjengelig fra: 2013-10-17 Laget: 2013-10-17 Sist oppdatert: 2017-11-09bibliografisk kontrollert
    3. Modular Design of Hydromechanical Transmissions for Mobile Working Machines
    Åpne denne publikasjonen i ny fane eller vindu >>Modular Design of Hydromechanical Transmissions for Mobile Working Machines
    2013 (engelsk)Inngår i: Proceedings of the 13th Scandinavian International Conference on Fluid Power,(SICFP2013), June 3-5, 2013, Linköping, Sweden, Linköping: Linköping University Electronic Press, 2013, s. 113-119Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    This paper demonstrates an optimisation-based method to design modular gearboxes scalable for a range of applications. The design is adapted to the typical operating behaviours of the reference vehicles and considers the manufacturing costs of the gearboxes. Hydromechanical continuously variable transmissions (CVTs) are today strong candidates to replace drive line transmissions based on fuel-thirsty torque converters in many mobile working machines. The advantages include wide range of torque/speed ratios, high energy efficiency throughout the speed range and decoupling of the engine speed and the vehicle speed. Advanced multiple mode CVTs, however, are difficult to evaluate early in the product development process due to the complex architectures and the great variety of possible concepts. There is consequently an increased need for methods to design, compare and evaluate the transmission concepts. To decrease the development and manufacturing costs, there is also a need for scalable transmission concepts that can be used in several applications of different classes. The results show the proficiency of the methodology compared to a manual design process and that the energy efficiency of the transmissions are heavy coupled to the designs.

    sted, utgiver, år, opplag, sider
    Linköping: Linköping University Electronic Press, 2013
    Serie
    Linköping Electronic Conference Proceedings, ISSN 1650-3686, E-ISSN 1650-3740 ; 92
    Emneord
    Hydromechanical transmissions, Power-split, Design optimisation
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-99381 (URN)10.3384/ecp1392a12 (DOI)978-91-7519-572-8 (ISBN)
    Konferanse
    Proceedings of the 13th Scandinavian International Conference on Fluid Power, (SICFP2013), June 3-5, 2013, Linköping, Sweden
    Tilgjengelig fra: 2013-10-17 Laget: 2013-10-17 Sist oppdatert: 2019-01-24bibliografisk kontrollert
    4. Simulation Aided Design and Testing of Hydromechanical Transmissions
    Åpne denne publikasjonen i ny fane eller vindu >>Simulation Aided Design and Testing of Hydromechanical Transmissions
    2014 (engelsk)Inngår i: The 9th JFPS International Symposium on Fluid Power, Matsue, 2014, 2014Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    This paper demonstrates the use of high-speed simulation in transmission conceptual design and presents a transmission test bed for hardware-in-the-loop simulations of hydromechanical transmission concepts. Complex transmissions, such as multiple-mode hydromechanical transmissions and hydraulic hybrid transmissions, present new difficulties and costs in the development process. There is today a greater demand for more efficient product development and more work has shifted towards simulation. The Hopsan simulation package allows robust, high-speed simulations suitable for both offline and hardware-in-the-loop simulation. New simulation models for hydromechanical transmissions are developed and used to simulate a known two-mode transmission concept. The same concept is also tested in hardware-in-the-loop simulations in the proposed transmission test bed. Results show good agreement with the hardware tests and highlight the proficiency of the simulation tools.

    Emneord
    Hydromechanical Transmission, Hardware-in-the-loop, Hopsan
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-126561 (URN)4-931070-10-8 (ISBN)
    Konferanse
    the 9th JFPS International Symposium on Fluid Power in Matsue, Shimane Japan, on October 28-31, 2014
    Tilgjengelig fra: 2016-03-30 Laget: 2016-03-30 Sist oppdatert: 2018-03-21
    5. Mode Shifting in Hybrid Hydromechanical Transmissions
    Åpne denne publikasjonen i ny fane eller vindu >>Mode Shifting in Hybrid Hydromechanical Transmissions
    2015 (engelsk)Inngår i: ASME/BATH 2015 Symposium on Fluid Power and Motion Control, ASME Press, 2015, s. 13-Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    Demands for low cost sustainable solutions have increased the use of and interest in complex hydromechanical transmissions for heavy off-road vehicles. In transmissions with multiplemodes, an important condition is to maintain the tractive force during the mode shifting event. For hybrid hydromechanical transmissions, with a direct connection to a hydraulic accumulator, the impressed system pressure caused by the hydraulic accumulator has not yet been observed to interfere with this condition. In this paper, a black box model approach is used to modify the hydraulic system after obtaining knowledge regarding how it is affected by a mode shift. A comparative study is carried out where a full vehicle model of a mobile working machine is simulated with two different hydraulic systems. The results show that different system solutions imply different demands on the included components, and that the mode shifting event is not a negligible factor in heavy hydraulic hybrid vehicles.

    sted, utgiver, år, opplag, sider
    ASME Press, 2015
    Emneord
    Mode shifting, hydromechanical transmissions, fluid power, heavy construction machinery
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-126556 (URN)10.1115/FPMC2015-9583 (DOI)000373970500045 ()978-0-7918-5723-6 (ISBN)
    Konferanse
    ASME/BATH 2015 Symposium on Fluid Power and Motion Control, Chicago, Illinois, USA, October 12–14, 2015
    Prosjekter
    Research on Hydromechanical Transmissions and Hybrid Motion systems, RHYTHM
    Forskningsfinansiär
    Swedish Energy Agency, P39367-1
    Tilgjengelig fra: 2016-03-30 Laget: 2016-03-30 Sist oppdatert: 2019-08-21
    6. A novel hydromechanical hybrid motion system for construction machines
    Åpne denne publikasjonen i ny fane eller vindu >>A novel hydromechanical hybrid motion system for construction machines
    2017 (engelsk)Inngår i: International Journal of Fluid Power, ISSN 1439-9776, Vol. 18, nr 1, s. 17-28Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    This paper deals with a novel type of hybrid motion system for construction machines based on a common pressure rail shared between a hydromechanical power-split transmission and secondary controlled work hydraulics. A construction machine with driveline and work functions is a complex coupled motion system and the design of an effective hybrid system needs to take both subsystems into account. Studies on energy efficient hybrid systems for construction machines have hitherto principally focused on one subsystem at a time - work hydraulics or driveline. The paper demonstrates a use case with a specific transmission concept proposal for a medium-sized wheel loader. The system is modelled and simulated using an optimal energy management strategy based on dynamic programming. The results show the benefits of a throttle-free bidirectional link between the machine's subsystems and the energy storage, while taking advantage of the complex power flows of the power-split transmission.

    sted, utgiver, år, opplag, sider
    Abingdon, UK: Taylor & Francis, 2017
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-142329 (URN)10.1080/14399776.2016.1210423 (DOI)
    Tilgjengelig fra: 2017-10-26 Laget: 2017-10-26 Sist oppdatert: 2017-11-09bibliografisk kontrollert
  • 102.
    Unnikrishnan, Vishnu
    et al.
    Linköpings universitet, Institutionen för systemteknik, Elektroniska Kretsar och System. Linköpings universitet, Tekniska fakulteten.
    Vesterbacka, Mark
    Linköpings universitet, Institutionen för systemteknik, Elektroniska Kretsar och System. Linköpings universitet, Tekniska fakulteten.
    Mitigation of Sampling Errors in VCO-Based ADCs2017Inngår i: IEEE Transactions on Circuits and Systems Part 1: Regular Papers, ISSN 1549-8328, E-ISSN 1558-0806, Vol. 64, nr 7, s. 1730-1739Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Voltage-controlled-oscillator-based analog-to-digital converter (ADC) is a scaling-friendly architecture to build ADCs in fine-feature complimentary metal-oxide-semiconductor processes. Lending itself to an implementation with digital components, such a converter enables design automation with existing digital CAD hence reducing design and porting costs compared with a custom design flow. However, robust architectures and circuit techniques that reduce the dependence of performance on component accuracy are required to achieve good performance while designing converters with low accuracy components like standard cells in deeply-scaled processes. This paper investigates errors resulting from the sampling of a fast switching multi-phase ring oscillator output. A scheme employing ones-counters is proposed to encode the sampled ring oscillator code into a binary representation, which is resilient to a class of sampling induced errors modeled by the temporal reordering of the transitions in the ring. In addition to correcting errors caused by deterministic reordering, proposed encoding suppresses conversion errors in the presence of arbitrary reordering patterns that may result from automatic place-and-route in wire-delay dominated processes. The error suppression capability of the encoding is demonstrated using MATLAB simulation. The proposed encoder reduces the error caused by the random reordering of six subsequent bits in the sampled signal from 31 to 2 LSBs for a 31-stage oscillator.

  • 103.
    Vogel-Heuser, Birgit
    et al.
    Tech Univ Munich, Germany.
    Ribeiro, Luis
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska fakulteten.
    Bringing Automated Intelligence to Cyber-Physical Production Systems in Factory Automation2018Inngår i: 2018 IEEE 14TH INTERNATIONAL CONFERENCE ON AUTOMATION SCIENCE AND ENGINEERING (CASE), IEEE , 2018, s. 347-352Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Learning and intelligent algorithms are the basis for Cyber-Physical Production Systems (CPPS). They enable flexibility through reconfiguration ease and fault tolerance by ensuring that the CPPS adapts to changing conditions. However, in order to exhibit such characteristics, CPPS require a proper support for reliably handling the real time behavior of the physical systems they are in control of. This paper presents and discusses basic requirements for control software, which enables flexible and adaptable automated Production Systems (aPS) modelled according to the CPPS concept. In doing so, the paper exposes the main architectural guidelines and rationale for where to place and operate intelligent algorithms in the context of industrial automation for continuous processes.

  • 104.
    Walldén, Johan
    Linköpings universitet, Institutionen för systemteknik, Elektroniska komponenter. Linköpings universitet, Tekniska högskolan.
    Radiation Induced Effects in Electronic Devices and Radiation Hardening By Design Techniques2014Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The aim with this thesis has been to make a survey of radiation hardened electronics, explaining why and how radiation affects electronics and what can be done to harden it.

    The effects radiation have on electronics in general and in specific commonly used devices are explained qualitatively. The effects are divided into Displacement Damage (DD), Total Ionizing Dose (TID) and Single Event Effects (SEEs). The devices explained are MOSFETs, Silicon On Insulator (SOI) transistors, 3D-transistors, Power transistors, Optocouplers, Field Programmable Gate Arrays (FPGAs), three dimensional circuits (3D-ICs) and Flash memories.

    Different radiation hardening by design (RHBD) techniques used to reduce or to remove the negative effects radiation induces in electronics are also explained. The techniques are Annular transistors, Enclosed source/drain transistors, Guard rings, Triple Modular Redundancy (TMR), Dual Interlocked Storage Cells (DICE), Guard gates, Temporal filtering,Multiple drive, Charge dissipation, Differential Charge Cancellation (DCC), Scrubbing, Lockstep, EDAC codes and Watchdog timers.

  • 105.
    Werin, Atle
    Linköpings universitet, Institutionen för systemteknik, Datorteknik.
    Use of a Multiplexer to get Multiple Streams Through a Limited Interface: Encapsulation of digital video broadcasting streams2016Independent thesis Basic level (university diploma), 180 hpOppgave
    Abstract [en]

    In digital video broadcasting, sometimes many sources are used. When handling this broadcast a problem is a limited interface that has a fixed number to input channels but overcapacity in data transfer rate. To be able to connect more inputs to the interface a protocol that lets the user send more than one channel on a connection is needed. The important part for the protocol is that it keeps the input equal to the output both in timing and in what data is sent. These are done by encapsulating the data and use a header containing information for recreating the input. To solve the timing constraint dynamic buffer are used that makes all data evenly delayed. To validate the functionality of the protocol a test designed is implemented in VHDL and simulated.

  • 106.
    Wikner, Jacob
    et al.
    Linköpings universitet, Institutionen för systemteknik, Elektroniksystem. Linköpings universitet, Tekniska högskolan.
    Tan, Nianxiong
    Linköpings universitet, Institutionen för systemteknik, Elektroniksystem. Linköpings universitet, Tekniska högskolan.
    Influences of Circuit Imperfections on the Dynamic Performance of DACs1997Inngår i: Proceedings of the 17th Norchip Conference, K. O. , 1997Konferansepaper (Fagfellevurdert)
  • 107.
    Wzorek, Mariusz
    et al.
    Linköpings universitet, Institutionen för datavetenskap, Artificiell intelligens och integrerade datorsystem. Linköpings universitet, Tekniska fakulteten.
    Rudol, Piotr
    Linköpings universitet, Institutionen för datavetenskap, Artificiell intelligens och integrerade datorsystem. Linköpings universitet, Tekniska fakulteten.
    Conte, Gianpaolo
    Linköpings universitet, Institutionen för datavetenskap, Artificiell intelligens och integrerade datorsystem. Linköpings universitet, Tekniska fakulteten.
    Doherty, Patrick
    Linköpings universitet, Institutionen för datavetenskap, Artificiell intelligens och integrerade datorsystem. Linköpings universitet, Tekniska fakulteten.
    LinkBoard: Advanced Flight Control System for Micro Unmanned Aerial Vehicles2017Inngår i: 2017 2ND INTERNATIONAL CONFERENCE ON CONTROL AND ROBOTICS ENGINEERING (ICCRE2017), IEEE , 2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents the design and development of the LinkBoard, an advanced flight control system for micro Unmanned Aerial Vehicles (UAVs). Both hardware and software architectures are presented. The LinkBoard includes four processing units and a full inertial measurement unit. In the basic configuration, the software architecture includes a fully configurable set of control modes and sensor fusion algorithms for autonomous UAV operation. The system proposed allows for easy integration with new platforms, additional external sensors and a flexibility to trade off computational power, weight and power consumption. Due to the available onboard computational power, it has been used for computationally demanding applications such as the implementation of an autonomous indoor vision-based navigation system with all computations performed onboard. The autopilot has been manufactured and deployed on multiple UAVs. Examples of UAV systems built with the LinkBoard and their applications are presented, as well as an in-flight experimental performance evaluation of a newly developed attitude estimation filter.

  • 108.
    Xiaoyi, Peng
    Linköpings universitet, Institutionen för systemteknik, Datorteknik.
    Benchmark of MPEG-2 Video Decoding on ePUMA Multi-core DSP Processor2011Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Video decoding technologies have been widely used in our daily life. Higherresolutions and more advanced coding technologies may promote the capabilitiesof video decoding. A new multi-core digital signal processing processor, ePUMA,which stands for embedded Parallel DSP platform with Unique Memory Access,is chosen to investigate how it supports video decoding.

    This thesis aims to benchmark the algorithms of video decoding and evaluatethe performance using ePUMA in MPEG-2 standard, which is a common standardwith the purpose of compressing video signals. Based on the slice-parallelismmethodology on eight co-processors of ePUMA, the implementation of the algorithemsconsists of variable length decoding, inverse scan, inverse quantization,two-dimensional inverse discrete cosine transform, motion vector decoding, formprediction and motion compensation. The performance of the kernels is benchmarkedby ePUMA system simulator. The result shows that to decode real-timeFull HD (1920*1080 pixels, 30 frames per second) video, it will require ePUMA torun at 280 MHz for I frames and at 320MHz for P frames.

  • 109.
    Zhang, Yingfeng
    et al.
    Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Ministry of Education, Northwestern Polytechnical University, Shaanx, China / Department of Industrial Engineering, Northwestern Polytechnical University, Xi’an, China.
    Zhang, Geng
    Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Ministry of Education, Northwestern Polytechnical University, Shaanx, China.
    Liu, Yang
    Department of Production, University of Vaasa, Vaasa, Finland.
    Hu, Di
    Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Ministry of Education, Northwestern Polytechnical University, Shaanx, China.
    Research on services encapsulation and virtualization access model of machine for cloud manufacturing2015Inngår i: Journal of Intelligent Manufacturing, ISSN 0956-5515, E-ISSN 1572-8145, s. 1-15Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Considering the new requirements of the services encapsulation and virtualization access of manufacturing resources for cloud manufacturing (CMfg), this paper presents a services encapsulation and virtualization access model for manufacturing machine by combining the Internet of Things techniques and cloud computing. Based on this model, some key enabling technologies, such as configuration of sensors, active sensing of real-time manufacturing information, services encapsulation, registration and publishing method are designed. By implementing the proposed services encapsulation and virtualization access model to manufacturing machine, the capability of the machine could be actively perceived, the production process is transparent and can be timely visited, and the virtualized machine could be accessed to CMfg platform through a loose coupling, ‘plug and play’ manner. The proposed model and methods will provide the real-time, accurate, value-added and useful manufacturing information for optimal configuration and scheduling of large-scale manufacturing resources in a CMfg environment.

  • 110.
    Zhou, Ruoxing
    Linköpings universitet, Institutionen för systemteknik, Datorteknik. Linköpings universitet, Tekniska högskolan.
    Dynamic Partial Reconfigurable FPGA2011Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Partial Reconfigurable FPGA provides ability of reconfigure the FPGA duringrun-time. But the reconfigurable part is disabled while performing reconfiguration. In order to maintain the functionality of system, data stream should be hold for RP during that time. Due to this feature, the reconfiguration time becomes critical to designed system. Therefore this thesis aims to build a functional partial reconfigurable system and figure out how much time the reconfiguration takes.

    A XILINX ML605 evaluation board is used for implementing the system, which has one static part and two partial reconfigurable modules, ICMP and HTTP. A Web Client sends different packets to the system requesting different services. These packets’ type information are analyzed and the requests are held by a MicroBlaze core, which also triggers the system’s self-reconfiguration. The reconfiguration swaps the system between ICMP and HTTP modules to handle the requests. Therefore, the reconfiguration time is defined between detection of packet type and completion of reconfiguration. A counter is built in SP for measuring the reconfiguration time.

    Verification shows that this system works correctly. Analyze of test results indicates that reconfiguration takes 231ms and consumes 9274KB of storage, which saves 93% of time and 50% of storage compared with static FPGA configuration.

  • 111.
    Öhlin, Andreas
    Linköpings universitet, Institutionen för systemteknik, Datorteknik. Linköpings universitet, Tekniska fakulteten.
    Real-Time Multi-Dimensional Fast Fourier Transforms on FPGAs2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This thesis presents a way of performing multi dimensional FFT in a continuousflow environment by calculating the FFT of each dimension separately ina pipeline. The result is a three dimensional pipelined FFT implemented on aStratix III FPGA. It can calculate the three dimensional FFT of a data set containing2563 samples with a word size of 32 bits. The biggest challenge and themain part of the work are the data permutations in between the one dimensionalFFT modules, this part of the design make use of an external DDR2 SDRAMas well as on-chip BRAM to store and permute data between the modules. Theevaluations show that the design is hardware efficient and the latency is relativelylow and determined to be 84.2 ms.

  • 112.
    Österberg, Johan
    et al.
    Linköpings universitet, Institutionen för systemteknik, Elektroniksystem. Linköpings universitet, Tekniska högskolan.
    Ekblom, Carl-David
    Linköpings universitet, Institutionen för systemteknik, Elektroniksystem. Linköpings universitet, Tekniska högskolan.
    USB 2.0 Audio device2012Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The main task of this project were to develop, hardware and software that could stream audio data via USB 2.0. This project were based on XMOS, USB 2.0 design. In this project we have brought an idea to reality in the form of a finished product. This with verification help from engineers on Syncore technologies. Under the development process the functionality surrounding component databases, provided by Altium designer, were to be evaluated. To be mentioned is that Altium designer was the software used to develop the PCB in this project. After many hours spent developing, we finally got the hardware and software to behave in the way it was suppose to do. That is, to be able to stream audio data from a high-resolution source(PC/MAC/unit with S/PDIF out, maximum resolution 24-bit 192 kHz). This to both S/PDIF and analog stereo out via RCA-connectors. The sound quality from a possible subjective point of view is very good and we are happy with the result. We think that the functionality surrounding component databases are convenient in many applications. Not just the fact that you easily can generate an up to date pricing of all components used in a project, you can also shorten the development process. This because the developer don't have to recreate schematic symbols and footprints that has already been created. Which of course was the fundamental idea behind the database functionality. These are just a few examples of its advantages. To be considered is the fact that the administration surrounding the component databases can be very time consuming. To take full advantage of Altium designers functionalities we think that it needs a dedicated administrator that maintains the database repository.

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