[dipl] Perustieteiden korkeakoulu / SCI

Permanent URI for this collectionhttps://aaltodoc.aalto.fi/handle/123456789/21

Browse

Browsing [dipl] Perustieteiden korkeakoulu / SCI by Department "Automaatio- ja systeemitekniikan laitos"

Filter results by typing the first few letters
Now showing 1 - 6 of 6
  • Control and data collection software for automatic integrated circuit evaluation
    (2012) Niemi, Anssi
     Master's thesis
    Automatic evaluation of integrated circuits can provide significant benefits and savings for a company compared to doing the evaluation manually. This paper describes a LabVIEW application called ATAC that was developed to automate evaluation of ASIC circuits. The same software can also be used to test integrated circuits in general in different hardware environments. A hardware setup for automatic ASIC evaluation is presented and it is used as basis for ATAC design. Presented software application ATAC can be used to control all hardware components in the evaluation setup but it can also be used without the hardware components. Hardware abstraction in ATAC makes it possible to use the same software solution in different environments with little modifications to the software code. The process of developing ATAC is presented as well as final application. Screenshots of GUI are presented as well as the underlying code using state chart presentation. The software was reviewed and assessed by end users who performed several ASIC evaluation tests using ATAC during the software development. An example case of an ASIC evaluation test is presented and the measurement results gathered with ATAC are discussed.
  • Dynamic modeling of household electricity consumption
    (2012) Sorasalmi, Tomi
     Perustieteiden korkeakoulu | Master's thesis
    The change in household electricity consumption affects many parties in the electricity business, and therefore more accurate tools for analyzing the possible outcomes are needed. In this thesis, the objective is to implement a tool capable of producing future scenarios of the electricity consumption and load profile changes using structural modeling techniques. The tool consists of two simulation models, which are integrated and can be used separately or as one. The long-term model, describing household electricity consumption change during the next 40 years, is made using system dynamics approach. The short-term model, describing daily and weekly load profiles, is made using bottom-up approach. By dividing the problem into two models the benefits from both top-down and bottom-up approaches can be used and the problems related to stiff systems can be avoided. The long-term model is validated against historical data and with expert evaluations. The model can be used for generating scenarios of the future household electricity consumption and the user can change parameters by using the implemented user interface. Integration of the two different approaches was successful and the model is able to address how different changes in the long-term model, such as the number and energy efficiency of appliances, are affecting the load profiles. However, the shortterm model is incomplete and therefore the simulation results are only indicative.
  • Feasibility of Agent-Based Modeling and Simulation in Modeling Waste Value Chains
    (2012) Kangasrääsiö, Antti
     Perustieteiden korkeakoulu | Master's thesis
    Waste management policies have a large impact on how the waste management system behaves. However, deciding suitable policies may be difficult as the system may be very complex. Simulation models of waste management systems are important for the development of relevant waste management policies, as they allow the effects of these policies to be evaluated before they are actually implemented. Waste value chain analysis is a new method for modeling waste management systems. The idea of waste value chain analysis is to model each decision maker acting in the waste management system as an individual actor that can make independent decisions. The effects of these decisions can be aggregated to model how the waste management system behaves as a whole. This study evaluates the feasibility of implementing waste value chain analysis models using agent-based modeling and simulation. The motivation for using agent-based modeling and simulation is its ability to model distributed decision making using a variety of interacting agents. This study constructs an experimental waste value chain analysis simulation model of the waste management of the Finnish daily consumables retail shops using agent-based modeling and simulation. It then analyzes the feasibility of the modeling paradigm for implementing these kinds of models based on literature sources, experiences gathered from the modeling project and opinions from subject matter experts. The result of the study is that implementing waste value chain analysis models using agent-based modeling and simulation appears to be generally feasible. However, validating these kinds of models may be challenging, as a considerable amount of data needs to be collected.
  • Identifying and Controlling Stray Reads at RFID Gates
    (2012) Toivonen, Antti S.
     Master's thesis
    A modern UHF RFID system can reach a read range of over ten meters. Long read range and difficulties to create uniform interrogation zone lead to stray reads. Interrogation zone can be adjusted by controlling the transmit power of RFID reader, selecting antennas and RFID tags carefully for the purpose, and with different signal quality validation methods. It is common that industry processes prevent using optimal RFID tag size and location for best read reliability. In these situations reader transmit power is increased to gain better read reliability. This extends the interrogation zone over the designed and leads to stray reads. At UHF band the interrogation zone is not sharp edged. This is due to orientation differences between tags, tag to tag differences, multipathing and interference caused by multipathing. In this thesis, different methods to identify RFID-tags moving along specified routes in the far field on the specific interrogation zone and discard other read events as stray events, are studied. Algorithm to detect lay around tags is proposed.
  • Synchronized Cooperative Simulation: OPC UA Based Approach
    (2012) Miettinen, Tuomas
     Master's thesis
    Most simulation tools excel at only one technical domain. For efficient simulation of multi-domain systems, cooperative simulation (co-simulation) can be used. In co-simulation, a simulation model is divided into smaller submodels to allow each of the submodels to be simulated with a purpose-made simulator. The connectivity between the multiple simulators is a key factor in the performance of a co-simulation. In this work, the OPC UA standard was chosen as the communication interface between the different simulators. OPC UA is considered an effective communication interface and, moreover, the versatility of OPC UA allows the same interface to be utilized by the user to control and configure the co-simulation. In this thesis, the core functionalities of an effective and scalable synchronized co-simulation environment were designed and implemented. As an important part of the work, a novel solution for OPC UA based synchronization in continuous dynamic co-simulation is proposed. The evaluation conducted on the implementation confirms that both the synchronization solution and the OPC UA interface are suitable for being used in co-simulation of real-world systems.
  • Traktorin kehittyneen takanostolaitteen karteesinen ohjaus
    (2012) Matikainen, Ville
     Master's thesis
    The movement of a traditional three-point hitch of an agricultural tractor provides one degree of freedom. This limits the use of hitched implements and forces implement manufacturers to build additional hydraulics into the implement. In this research a tractor was instrumented to provide two rotational and two translational degrees of freedom for the rear hitch. The goal was to develop a control system which allows the operator to control the rear hitch in Cartesian space. To allow Cartesian control four different models of the inverse kinematics of the rear hitch were developed. Three of them were chosen for field tests based on feasibility for real-time control. First model was a geometrical one. A hybrid model used the iterative DLS-method for calculating the inverse kinematics for the lower links from the direct kinematic transform and rotation matrix for calculating the upper link control. Third model used DLS-method with a few modifications: the restriction for the lower hitch point span was considered as one state of the system and also the jacobian of the upper link was augmented to the inversed jacobian. Algebraic solution proved too complex and was thus not tested. For controlling the rear hitch a system of two ECUs was made. A PhyCORE MPC555-computer module was used to read analog measurements and control the cylinders of the rear hitch. A Toradex Colibri computer module was used to calculate the inverse kinematics and to handle communications with the user via a joystick and a virtual terminal. In software development Simulink C-code generation was utilized for both computers. A user interface for VT was also developed with PoolEdit. All three kinematical models provided logically correct behavior in the actual test tractor, with minor differences in repeatability and absolute accuracy. The system provides a good solution to situations where controllability of the implement is advantageous without requiring extra effort from the operator.