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According to rotary vibration at the end of the concrete pump truck boom, analysis of the boom rotary vibration mechanism is carried out. Rigid-flexible coupling dynamics model and vibration control co-simulation model of the boom system are established. The analysis of the dynamic model solution shows that the simulation rotation vibration displacement curves at the end of the boom are coincided...
In this paper, the problem of adaptive fixed-time 6 degree-of-freedom (DOF) tracking control for spacecraft non-cooperative rendezvous in presence of the parameter uncertainties and external disturbances is investigated. Firstly, a new multilayer fixed-time sliding mode surface (MFSMS) is designed, and the setting time of the proposed surface can be estimated without the knowledge of the initial conditions...
In this paper, the problem on robust H∞ control for 6-DOF spacecraft formation flying in the presence of parameter uncertainties and external disturbances is addressed. Firstly, the model of coupled translation and rotation motion of spacecraft formation is established. Subsequently, a robust H∞ controller is proposed, which is constructed by the solution to the Hamilton-Jacobi-Inequality (HJI). It...
In this paper, the input design problem for general multi-input multi-output (MIMO) linear time invariant (LTI) systems is considered. We discuss the conditions for the identifiability of the parameters in the system such that basic design principles for the multisine input signal are given. Also, the relationship between the input signal and the cost function of Cramer Rao (C-R) bound is studied...
This paper presents a study of the radiation efficiency measurement of antennas using the source stirred chamber (SSC) method. The antenna under test (AUT) was a coplanar-line-fed monopole. By using the minimum value of the input resistance of the antenna in the chamber under different stirring configurations and introducing frequency stirring technique, the resonance effect can be greatly reduced...
In this paper, we studied the progression of parking guidance system technology and application in recent years. We carried on the demand analysis according to parking guidance system. We designed the architecture of parking guidance system. we introduced the ant colony algorithm, and improved the heuristic function and strategy for topology updating of ant colony algorithm based on busy state road...
One of the most important information in outdoor emergency rescue is the location of the trapped people. The more quickly and precisely the location can be determined, the more chance the victims can be saved. In this paper, an instantly deployable localization system is proposed, which takes the mobile phone carried by the trapped people as the localization carrier, and consists of several Portable...
In this paper, we design ADRC for PMLM and propose RESO to estimate the disturbances. The theoretical analysis and simulation show that RESO-based ADRC can guarantee high-precision of PMLM.
In wireless sensor networks, locating a source from its emissions has gained considerable interest over the past few years. In this paper, an enhanced constrained total least squares estimator is proposed for the localization problem under an additive measurement error model. Compared with CTLS algorithm, our method takes not only linear term of TDOA measurement noise but also quadratic term which...
In medium-/high-power inverters, optimal pulse-width modulation (OPWM) is often used to reduce the switching frequency and at the same time, realize selective harmonic elimination (SHE). For both two-level and multilevel inverters, most selective harmonic elimination (SHE) studies are based on solving multiple variable high-order nonlinear equations. Furthermore, for multilevel inverters, SHE has...
A novel sub-optimal control algorithm based on fuzzy logic system (FLS) to design continuous sliding mode control (CSMC) for uncertain nonlinear systems is presented. By means of combining a fuzzy logic system into sliding mode control, continuous sliding mode control (SMC) can be designed on the derivative of the control signal. The realization of the controller is easier and more convenient than...
In this paper the implementation of the vector control systems for a variable-speed 4088kW PMSM (Permanent Magnet Synchronous Motor)in ship electric propulsion systems has been studied. At the basis of analysis of the mathematical model of the PMSM and the principle of vector control, two methods for modeling and simulating of PMSM system based on the Current Hystersis PWM (Pulse Width Modulation)...
Based on the motion principle of gastropod, a novel interventional minimal invasive robot which has the ability to run smoothly in the biological lumen with impulsive flowing liquid has been presented. Simulation models of the interventional micro robot operating in the straight or the bend blood vessels have been established with the software of Fluent. Blood flow distribution and the impact force...
In this paper, the power gain improvements by stress contact etch stop layer (CESL) in a 65-nm nMOSFET were studied. Compared to the conventional nMOSFET, the device with CESL stress shows an extra 6% power gain enhancement for the increased stress in the channel region. This study also presents the polyharmonic distortion (PHD) model extraction by X-parameters measurement when the power transistor...
In a typical synchronous SoC design, a huge peak current often occurs near the time of an active clock edge because of aggregate switching of a large number of transistors. The number of aggregate switching transistors can be lessened if the SoC design can use a clock scheme of mixed rising and falling triggering edges rather than one of pure rising (falling) triggering edges. In this paper, we propose...
In this research, we designed a universal graph model. We targeted this work on improving graph data organization representation, flexible formation of graph substructures for complex system modeling and generic processing of data organization. We form coherently composed graph modeling features including inheritance hierarchy of basic graph types, data participating graphs of multiple aspects, hierarchically...
The capabilities of extended state observer (ESO) for estimating uncertainties is discussed in this paper. The scope of the disturbances that can be observed by LESO with bounded observing errors is given. The observing errors for several typical disturbances-constant disturbance, sine disturbance, ramp disturbance, and square wave disturbance are further analyzed. It is demonstrated that ESO can...
To produce an assembled electronic product, the components are manufactured with certain manufacturing operations and then assembled with the required assembly operations. In the manufacturing operations, each component must be manufactured within the allocated working tolerances such that the assembly operations can be performed to build the final product. In a collaborative manufacturing system,...
The concept of Logical Service Provision Number (LSPN) is proposed to evaluate the service provision capacity in multicast and unicast integrated multiclass service cellular networks. The tradeoff between call blocking probability and LSPN is investigated and an objective function of maximizing LSPN is proposed. To solve the optimal problem, the system is modeled as a 2K-dimensional Markov process...
In the paper, the observability of the error states of the laser gyro strap down inertial navigation system (SINS) in the condition of the outer field is studied. The dynamic equations for the errors are proposed and the observability of the 15 error states (velocity errors, position errors, bias errors of the inertial instruments) of the system is analyzed. The convergence rate of the states is also...
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