This article investigates multi-input multi-output (MIMO) mixed vibration control testing for Sinusoid on Random (SoR). The challenge of this vibration test is the mixed signal separation. The response signals at the ...
详细信息
This article investigates multi-input multi-output (MIMO) mixed vibration control testing for Sinusoid on Random (SoR). The challenge of this vibration test is the mixed signal separation. The response signals at the control channels are composed of the broadband random component and the sinusoidal components. Firstly, the extracted accuracy of the Improved Correlation Integral Method (ICIM) is analyzed. The influences of the parameters used in ICIM are discussed in detail. Secondly, a new method, named Variance Minimum Method (VMM), is proposed for signal separation. Extraction accuracies of the ICIM and the proposed VMM are compared under different parameters. Finally, the control methods are proposed to iteratively update the driving signals of each component in the light of the deviations between the response signals and specified references. A cantilever beam example and biaxial vibration experiment manifest that the VMM and control method can be applied for the multi-shaker SoR vibration control tests.
This work presents spectral efficient frequency division multiplexing with subcarrier index modulation (SEFDM-SIM) for multi-input multi-output (MIMO) wireless networks. SEFDM employs non-orthogonal frequency division...
详细信息
This work presents spectral efficient frequency division multiplexing with subcarrier index modulation (SEFDM-SIM) for multi-input multi-output (MIMO) wireless networks. SEFDM employs non-orthogonal frequency division multiplexing to enhance the spectral efficiency (SE) at the expense of enhanced inter-carrier interference compared with traditional orthogonal frequency division multiplexing (OFDM). In SEFDM-SIM, the information is conveyed not only by $M$-ary signal constellations, as in SEFDM, but also by the indices of the subcarriers, which are activated according to the incoming bitstream. SE and bit error rate (BER) are used as the performance measures. Both the analytic and simulation results show that the proposed MIMO-SEFDM-SIM outperforms the conventional MIMO-OFDM and MIMO-OFDM-SIM in SE, while achieving an improved BER than the MIMO-OFDM and MIMO-SEFDM systems.
This article aims to improve the ride comfort of a vehicle keeping a satisfactory without road-holding performance by a novel adaptive control method that is insensitive to unknown system dynamics, model parameter cha...
详细信息
This article aims to improve the ride comfort of a vehicle keeping a satisfactory without road-holding performance by a novel adaptive control method that is insensitive to unknown system dynamics, model parameter changes, external disturbances and without any loss in suspension working space. With this purpose in mind, a new fuzzy integrated model-based adaptive control law for vehicle suspension systems is proposed in this study to improve the ride comfort and to ensure the robustness of system towards unknown model parameters and external disturbances. First, a model-based adaptive control law, which has the robust characteristics is presented. Afterwards, a multi-input multi-output fuzzy logic controller is designed to determine the controller gains dynamically. The stability of controller is ensured by Lyapunov Theory to achieve uniform boundedness error convergence. A 4 degree-of-freedom half-car model with active suspension system is used in this study to assess the performance of the controller. The results are compared among passive, model-based adaptive control law-controlled and novel fuzzy model-based adaptive control law-controlled systems. It has been concluded that fuzzy model-based adaptive control law further attenuates linear and angular motions of the vehicle increasing the ride comfort. The robustness is also verified for vehicle components having different possible parameter values. It is noteworthy that suspension working length returns to its initial position. Thus, the vehicle ride comfort is improved with no suspension working space loss. Finally, the economic feasibility of controllers has been checked in terms of energy consumption.
In this paper,the problem of designing a multi-input multi-output(MIMO)systemfor studying the non-minimum phase(NMP)behaviour is *** this purpose,a NMP MIMO circuit is proposed and studied under different *** main rea...
详细信息
In this paper,the problem of designing a multi-input multi-output(MIMO)systemfor studying the non-minimum phase(NMP)behaviour is *** this purpose,a NMP MIMO circuit is proposed and studied under different *** main reason for designing this circuit is the lack of a simple and flexible benchmark for examining different control *** to the simple structure and capability of showing different NMP characteristics,our proposed system is a suitable choice to study the behaviour of these ***,our proposed system can be extended by series and parallel connections to generate more complicated *** other advantages of this system are the large number of tunable parameters,adjustable interaction,variable number of poles and zeros,and inexpensive ***,this benchmark can be used as a tool for hardware ***,an optimal H∞decoupling control is applied to this benchmark to verify its effectiveness.
A three-dimensional (3-D) inverted-L multi-input multi-output (MIMO) magnetoelectric dipole antenna comprising two coupled monopole feed antennas is developed for energy-harvesting applications. Additionally, the elec...
详细信息
A three-dimensional (3-D) inverted-L multi-input multi-output (MIMO) magnetoelectric dipole antenna comprising two coupled monopole feed antennas is developed for energy-harvesting applications. Additionally, the electromagnetic band-gap (EBG) structure was used to improve the isolation (S-21) of the antennas. The bandwidth of the proposed antenna is up to 42.1% for 3-4.6 GHz, which covers the C-band (5G) applications of 3.3-3.8 GHz. The advantages of the proposed antenna are the following: low cross-polarization;good radiation patterns;stable and high gains (9.55 +/- 0.35 dBi) in the operating band;all simulated and measured return loss of the antennas (S-11 and S-22) are below -10 dB;and the isolation between two antennas is below -15 dB. Finally, the proposed antenna is suitable for modern energy-harvesting and 5G wireless sensor network systems.
With the increase in energy consumption, the concept of harvesting energy in the surroundings awaken a renewed interest. Scarcity of resources has been a great matter to all and researchers have been innovating new me...
详细信息
ISBN:
(纸本)9781509003600
With the increase in energy consumption, the concept of harvesting energy in the surroundings awaken a renewed interest. Scarcity of resources has been a great matter to all and researchers have been innovating new methods in harvesting energy. A power management system (PMS) is needed to manage and maximize the output energy coming from the piezoelectric and solar photovoltaic harvesters. However, there is no existing PMS for multi-input multi-output (MIMO) specified for the said harvesters. Hence, this paper focuses on the development of a fuzzy logic controller implemented in the PMS with the use of Fuzzy Interface System of MATLAB in order to achieve a better overall performance and utilization of the distribution of the generated energy from the harvester. In addition, the simulation and behavior of the decision making for the PMS was obtained.
This paper proposes a thorough closed-loop control design guideline for a new multi-input, multi-output DC/DC converter that is capable of integrating various types of power supplies and loads in DC microgrids. The op...
详细信息
ISBN:
(纸本)9781665434515
This paper proposes a thorough closed-loop control design guideline for a new multi-input, multi-output DC/DC converter that is capable of integrating various types of power supplies and loads in DC microgrids. The operational characteristics of the studied DC/DC converter are analyzed, and subsequently the small signal model of the generalized N-input, M-output converter is derived. Then, the system transfer function is developed. Based on this, a closed-loop PI control design guideline is presented. Simulation results of a three-input three-output DC/DC converter are presented to verify the efficacy of the proposed control design method.
In this paper, a technique for realizing a low condition number channel matrix for line-of-sight (LOS) multi-input multi-output (MEMO) transmission scenario is presented. The main idea behind the proposed work is to m...
详细信息
ISBN:
(纸本)9781479924325;9781479926596
In this paper, a technique for realizing a low condition number channel matrix for line-of-sight (LOS) multi-input multi-output (MEMO) transmission scenario is presented. The main idea behind the proposed work is to make use of a change in carrier frequency of adjacent transmit antennas to increase the MIMO capacity gain without requiring any additional bandwidth. We derive the criteria for the maximum capacity in terms of difference between carrier frequency for adjacent transmit antennas. The performance of this technique is investigated with the help of simulation results.
We propose a transfer-learning multi-input multi-output(TL-MIMO)scheme to significantly reduce the required training complexity for converging the equalizers in mode-division multiplexing(MDM)*** on a built three-mode...
详细信息
We propose a transfer-learning multi-input multi-output(TL-MIMO)scheme to significantly reduce the required training complexity for converging the equalizers in mode-division multiplexing(MDM)*** on a built three-mode(LP01,LP11a,and LP11b)multiplexed experimental system,we thoughtfully investigate the TL-MIMO performances on the three-typed data,collecting from different sampling times,launching optical powers,and inputting optical signal-to-noise ratios(OSNRs).A dramatic reduction of approximately 40%–83.33%in the required training complexity is achieved in all three ***,the good stability of TL-MIMO in both the launched powers and OSNR test bands has also been proved.
Both auto-power spectrum and cross-power spectrum need to be controlled in multi-input multi-output （MIMO） random vibration test. During the control process with the difference control algorithm （DCA）, a lower tri...
详细信息
Both auto-power spectrum and cross-power spectrum need to be controlled in multi-input multi-output （MIMO） random vibration test. During the control process with the difference control algorithm （DCA）, a lower triangular matrix is derived from Cholesky decomposition of a reference spectrum matrix. The diagonal elements of the lower triangular matrix （DELTM） may become negative. These negative values have no meaning in physical significance and can cause divergence of auto-power spectrum control. A proportional root mean square control algorithm （PRMSCA） provides another method to avoid the divergence caused by negative values of DELTM, but PRMSCA cannot control the cross-power spectrum. A new control algorithm named matrix power control algorithm （MPCA） is proposed in the paper. MPCA can guarantee that DELTM is always positive in the auto-power spectrum control. MPCA can also control the cross-power spectrum. After these three control algorithms are analyzed, three-input three-output random vibration control tests are implemented on a three-axis vibration shaker. The results show the validity of the proposed MPCA.
暂无评论