Design and implementation of a DSP control system for giant magnetostrictive smart structures

This paper traces the development of three-phase induction motor controls using the Semikron advanced integration (SKAI) power electronics system. The SKAI was developed for hybrid and electric vehicles and integrates all the components of a three-phase inverter. As such, it promises to deliver significant cost savings. The SKAI utilizes a digital signal processor (DSP) controller. However, Semikron does not supply the necessary software for the DSP controller. The DSP used in the controller is manufactured by Texas Instruments. Texas Instruments provides an array of DSP programming utilities. This paper discusses aspects of programming and testing the DSP controller

In order to improve the traditional speed-tension type three-motor synchronous control platform based on PLC bus control to further enhance the speed and control accuracy of the control system, enhance the control effect, Speed-Tension type Three-motor coordinate synchronous control platform based on Multi-microprocessor is proposed in this paper.In this platform, the complex programmable logic devices (CPLD), Digital Signal Processor (DSP) and microcontroller (MCU) are combined.In order to improve rapid and synchronization of the control system, CPLD Parallel nature is used to achieve three serial ports synchronous and concurrency control; Complex control algorithms are implement by the use of DSP fast and efficient data processing capabilities; Experimental results show: The control system is stable, at the same baud rate the control speed of the platform based on multi-microprocessor is more than three times faster than the one of the traditional PLC bus control platform.In the multi-microprocessor control platform， under the same control algorithm regulation time is more fast 0.53 seconds than traditional PLC control platform, the overshoot of the system is 13.53% of the one using traditional PLC control platform, and the tracking the maximum error reduces 60.53% than the one of the traditional PLC control platform.

Interior Acoustic Control System Using Boundary Vibration with Giant Magnetostrictive Actuator: Fundamental Consideration on the Control Algorithm

This paper presents the use of the viciLogic viciLab tool suite for prototyping of audio digital signal processing (DSP) hardware on remote or locally connected PYNQ Systems on Chip (SoCs), along with flexible computer control software interfaces. The tool suite enables rapid prototyping of DSP hardware components, including demonstration, control and visualisation of components on local or remote hardware. Hardware components can be developed directly in existing hardware description languages (HDLs) or using higher-level design interfaces such as MathWorks HDL coder. Two configurable software control interfaces are presented: a low-level console builder facilitating fast graphical user interface (GUI) creation for hardware interaction, along with script-based automation; and a high-level Python-based GUI console creator integrates audio sampling, automated DSP hardware effect selection and SoC control, audio streaming and playback, and real-time waveform graphing. The two interfaces presented in this paper are illustrated through a series of DSP examples of increasing complexity: 8- and 16-tap FIR filters (with user-created VHDL model source); distortion and tremolo DSP functions (developed MathWorks HDL coder VHDL model source); and combinations of these components.

Recently, real-time simulation of renewable energy sources are indispensible for evaluating the performance of the maximum power point tracking (MPPT) controller, especially in the photovoltaic (PV) system in order to reduce cost in the testing phase. Nowadays, real time PV simulators are obtained by using analog and/or digital components. In this paper, a real-time simulation of a PV system with a boost converter was proposed using only the digital signal processor (DSP) processor with two DC voltage sources to emulate the temperature and irradiation in the PV system. AMATLAB/ Simulink environment was used to develop the real-time PV system with a boost converter into a C-program and build it into a DSP controller TMS320F28335. Besides, the performance of the real-time DSP-based PV was tested in different temperature and irradiation conditions to observe the P-V and V-I characteristics. Further, the performance of the PV with a boost converter was tested at different temperatures and irradiations using MPPT algorithms. This scheme was tested through simulation and the results were validated with that of standard conditions given in the PV data sheets. Implementation of this project helped to attract more researchers to study renewable energy applications without real sources. This might facilitate the study of PV systems in a real-time scenario and the evaluation of what should be expected for PV modules available in the market.

While inverters currently do exist, the main focus of this investigation is to provide a DSP based design that will significantly reduce the cost of the current system. The proposed approach relies on an efficient pushpull DC-DC converter, a digital signal processor (DSP) control mechanism for the DC-AC conversion, and a rigorous cost reduction approach for this inverter. A low cost Texas Instruments, TMS320LF2407 DSP provides the control for the DC-AC converter allowing compliance to the total harmonic distortion (THD) specification of less that 5%. Moreover, the DSP allows convenient communication between the fuel cell and the inverter. The results section of this paper presents our laboratory data. A new closed-loop control scheme is also introduced which reduces the distortion caused by non-linear loads.

In this paper a digital signal processor (DSP) based power factor correction (PFC) scheme is presented. A dual-loop controller is designed to control the average input AC current as well as DC bus voltage. The DSP controller is implemented and tested. Design methodologies and trade-offs such as discrete-time implementation methods are also presented.

The present work develops an online stall control system combining a correlation measure, Digital Signal Processing (DSP) and tip micro injection with the current results of unsteady flow, the improved modern control theory and the advanced control technology. An online scheme is established by computing a correlation measure with signal multiplication and integration. When a correlation measure drops below a preset threshold, the DSP control system sends an electrical signal to an electromagnetic valve that turns on a micro injection system. In this paper, the results of the tests conducted in a research compressor show that the correlation scheme is able to sense an impending stall in advance. The experiments results in the compressor show that the correlation measure goes up accordingly with micro-injection. A new method for online stall control combining the modern Digital Signal Processing (DSP) technology and micro air injection is presented and discussed. A successful demonstration of the capability with the online DSP method in detecting the distribution function of the correlation measure and triggering the micro injection system is presented.

The inlet attack angle of rotor blade reasonably can be adjusted with the change of the stagger angle of inlet guide vane (IGV); so the efficiency of each condition will be affected. For the purpose to improve the efficiency, the DSP (Digital Signal Processor) controller is designed to adjust the stagger angle of IGV automatically in order to optimize the efficiency at any operating condition. The A/D signal collection includes inlet static pressure, outlet static pressure, outlet total pressure, rotor speed and torque signal, the efficiency can be calculated in the DSP, and the angle signal for the stepping motor which control the IGV will be sent out from the D/A. Experimental investigations are performed in a three-stage, low-speed axial compressor with variable inlet guide vanes. It is demonstrated that the DSP designed can well adjust the stagger angle of IGV online, the efficiency under different conditions can be optimized. This establishment of DSP online adjustment scheme may provide a practical solution for improving performance of multi-stage axial flow compressor when its operating condition is varied.

The authors describe a system using PWM (pulse-width modulation) control converters and induction motors to control a load power of 1200 kW. GTO (gate turn-off) thyristors are used for a practical power circuit, and a microprocessor in combination with DSP (digital signal processing) control is used to configure the control circuit. It is shown that by switching GTO thyristors using DSP with a sample time of 32 mu s, current control can be continued without any problems when asymmetrical flux saturation occurs in the transformer. This device has been developed with a view to application in high-speed railway systems. >

Due to the motion control system of electromagnetic linear actuator (EMLA) is a nonlinear system with poor controllability, single control strategy has been difficult to meet the requirements of its control. A compound control strategy based on inverse system control (ISC) and proportional-integral (PI) is designed in this paper. Switching between two algorithms, which is based on the fuzzy rules, prevents the control algorithm to jitter and jump. System model is build under Matlab/Simulink to do simulation analysis. The designed controller is integrated into the system simulation model and the system software of digital signal processor (DSP) controller. Simulation and test results show that the compound control strategy using fuzzy switching rules achieves the smooth transition of two control algorithms, and the goal of any position location, and continuous adjustment in 0~4mm lift. Positioning accuracy is up to ± 0.02mm, while the response time is less than 10ms.

Active microvibration control systems have beendeveloped and applied in a practical manner. Various types ofactuator, for example an air actuator, a linear movingactuator, a piezoelectric (PZT) actuator and a giant-magnetostrictive (GMS)actuator, have been used. In general, all actuators have bothmerits and demerits, so an optimal actuator should be selected based on the objective performance and the conditions of usage.We developed an active 6-DOF microvibration control systemusing GMS actuators. It has been speculatedthat the GMS actuator is suitable as adisplacement actuator for an active microvibration control. Thereasons for this are that it has better durability andreliability compared with a PZT actuator, and alsoits response to an input signal is much faster than an airactuator. However, the demerits of the GMSactuator come to light through practical application of thesystem. The displacement property tends to decrease with increase in the magnitude of forced axial load, and it cannot generate a sufficient displacement in a low frequency range.Therefore, in order to improve the above-mentioned demeritsrelated to a GMS actuator and an airactuator, we have developed a new type of hybrid actuator usinga GMS actuator and an air actuator. The twoactuators are arranged in parallel. This structural featureenables the new hybrid actuator to make up for both of the singleactuators' demerits. Consequently, it has become possible tocontrol displacement in the wider frequency range of0.1-100 Hz and to generate a maximum displacement of more than1 mm.This paper presents an outline of the experimental new hybrid actuator, the result of a dynamic characteristic test of theactuator and simulation analysis on the uni-axialmicrovibration control device using the hybrid actuator.Through these results, the higher performance achieved by the newly developed hybrid actuator isverified.

Modern High performance control applications demanded from mixed-signal and digital signal processors (DSPs) are ever increasing. As digital circuits and DSP operate at a higher rate, a considerable amount of noise and radiation degrades the system?s performance and creates EMI problems that make it difficult to pass tests required to obtain certification by the EMC regulations. In this paper, we introduce some effective methods for reduced EMI of the measurement and control systems, which are power supply design, clock and phase-locked loop (PLL) isolation, decoupling techniques, digital and analog partitioning, printed circuit board (PCB) layout, and so on for meeting many challenges of mixed-signal and DSP systems design. Design guidelines for improved EMC and signal integrity are derived from the results obtained, thus, the evaluation board of the measurement and control systems is especially suitable for performing function in high definition array induction log (HDAIL).

We have developed a high speed and effective control strategy for nonlinear systems such as a link system or legged-robots. It takes too much time to calculate the inverse dynamics compensation according to the increase of degrees of freedom. Therefore we proposed a parallel control method and developed small (5 cm/spl times/5 cm) digital signal processor (DSP) control unit for installation. The parallel computation based on interactive forces enables us to realize high speed calculation, and every DSP module has the same calculation routine.

A new type of adaptive beamforming antenna system architecture is proposed for multichannel wireless communications. Multibeam communication with high data throughput is accomplished using the proposed beamformer architecture. The system consists of analog mixers, a multitone direct digital synthesizer (DDS), and a digital signal processor (DSP) controller. The essential idea of multibeam forming is based on a multitone weighting scheme combined with analog-digital hybrid signal processing. While the real-time multibeam construction is realized by the analog mixer circuits and a DDS, the complicated adaptive beamforming and direction-of-arrival estimation algorithms are carried out by the DSP. In this architecture, only one beamformer circuit is required to handle multiple beams, leading to significant reduction in hardware counts. A 5.8-GHz eight-element adaptive beamforming array successfully demonstrates two-beam simultaneous beamforming with less than three degrees of peak and null steering errors and more than 20-dB interference suppression. The test-bed exhibits successful two-channel data recovery at 25-Mb/s data throughput in each channel with binary phase-shift keying modulation, for simultaneous dual-beam reception. The bit-error-rate measurement validates the robustness of the communication quality under strong interferences.