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In this paper, consider the effect of the load inertia fluctuation for surface-mounted permanent magnet synchronous motor (SPMSM), the problem of dynamic response of SPMSM is studied. A backstepping control algorithm based on disturbance observer (DO) is proposed. Firstly, according to the equation of motor speed, the minimum-order observer is established to observe the disturbance value of load inertia,...
Permanent magnet synchronous motor with its high torque density, high efficiency and high reliability, has become the mainstream of the drive system for electric vehicles, elevators, etc. The existing method of fault diagnosis based on the motor model has not considered the fractional characteristics of motor. it is difficult to effectively diagnose minor faults of the current. With the permanent...
In this paper, an optimal control allocation strategy is presented for an eight in-wheel-motor independent drive electric vehicle/four double front wheel steering(8WD/4WS). The upper level controller consists of a speed following controller and two sliding mode controllers. The speed tracking controller obtains the desired longitudinal force by tracking the longitudinal speed. Two sliding mode controllers...
This work is devoted to the admissibility analysis for singular time-delay systems by using delta operator approach. By estimating the delay term with a two-term approximation, the singular system in delta operator domain is transformed into an interconnection of a time-invariant subsystem with constant delay and a uncertain one. By resorting to the input-output approach, a delay-range-dependent admissibility...
In this paper, considering running process of the brushless DC motor (BLDCM), which has the disadvantages of nonlinear and uncertainty, a novel kind of speed tracking control method based on fuzzy single neuron PID is proposed. Firstly, the single neuron PID algorithm was designed, in which, the fuzzy control strategy is employed to online optimize the neuron scaling factors in order to improve adaptability...
In order to obtain more understanding about the regularity of ground clutter distribution, two types of measuring data about grass and soil have been taken in the Object Spectrum Characteristic Laboratory. This paper provided an analysis of the amplitude statistics of these data using Lognormal, Weibull, Gamma, Exponential and Rayleigh distribution. Their goodness-of-fit carried out by Kolmogorov-Smirnov...
Given the recent difficulty in continuing the classic CMOS manufacturing density and power scaling curves, also known as Moore's Law and Dennard Scaling, respectively, we find that modern complex system architectures are increasingly relying upon accelerators in order to optimize the placement of specific computational workloads. In addition, large-scale computing infrastructures utilized in HPC,...
Provenance describes detailed information about the history of a piece of data, containing the relationships among elements such as users, processes, jobs, and workflows that contribute to the existence of data. Provenance is key to supporting many data management functionalities that are increasingly important in operations such as identifying data sources, parameters, or assumptions behind a given...
Piezoelectric ceramic and the corresponding array are widely used in energy harvesting and ultrasonic application for the capabilities of converting compressive/tensile stresses to an electric charge, or vice versa. However, the need for a complex geometry of array is a major technical challenge for further application. To enable the fabrication of piezoelectric ceramics, additive manufacturing (AM)...
The focused ultrasound (FUS) systems are widely used due to their ability to generate a tight and intense focal region from a distributed source for the non-invasive and safely detection. However, these devices usually require elaborate arrays of a rather complex and cumbersome set of transducers. Holographic techniques are fundamental to applications such as volumetric displays and tweezers. The...
Piezoelectric ceramics are currently of considerable interest for their capabilities of converting compressive/tensile stresses to an electric charge, or vice versa. The applications of piezoelectric devises are far reaching, ranging from acoustic imaging to energy harvesting. However, conventional manufacturing processes such as etching and dicing for piezoelectric ceramics fabrication have limited...
Supernode transformation, or tiling, is a technique that partitions algorithms to improve data locality and parallelism to achieve shortest running time, benefiting the computation and data intensive applications such as ubiquitous multimedia services. It groups multiple iterations of nested loops into supernodes subsequently assigned to processors for computing in parallel. This paper focuses on...
Recently, CPU and graphics processors have been increasing the degree of on-chip parallelism in order to combat the decrease in traditional Moore's Law scaling. As a result, these new processors are increasing their appetite for faster memory devices with higher bandwidth. Component manufacturers have resorted to disparate or hierarchical fast memory device architectures such as shared local memory...
Using multiple models to deal with transients for adaptive systems which is large parametric uncertainties was introduced in the 1990s. The common method is using switching schemes. However, these methods has some potential drawbacks. In this paper, a new multiple models scheme is proposed for a class strict-feedback nonlinear discrete-time systems. Firstly, we use feedback linearization and backstepping...
With the introduction of virtual machine introspection into IaaS cloud, indirect inspection of the state about guest VMs is supported with strong isolation. But it requires the privilege access to the virtual machine monitor and lacks manageability due to the need of installing various security vendors' agents in a privileged VM. In this paper, we propose an agentless and uniform introspection framework,...
Stereolithography is a promising way to produce customized 3D structures. It has been playing an irreplaceable role in the industry because of its high customization and fast prototyping capability. Many areas such as medical molding and product prototyping have achieved big success with stereolithography. Dentists have used stereolithography for dental implants, orthodontics and oral surgery.
Since early 2012, the Cross-track Infrared Sounder (CrI)S on board the Suomi National Polar-Orbiting Partnership (S-NPP) Satellite has continually provided the hyperspectral infrared observations for profiling atmospheric temperature, moisture and greenhouse gases. In this study, the CrIS Sensor Data Record (SDR) data are improved for climate applications with its fine-tuning of calibration coefficients...
Commercial piezoelectric actuated stages usually has been decoupling designed from the mechanical structure. This paper develops a piezoelectric actuated stage (P-563.3CD) experiment platform. Observed cross-coupling effect in the piezo-stage is below 1%. In order to improve the performance of piezo-stage in a further step, a multi-channel Hammerstein model is developed to describe the cross-coupling...
In this paper, considering a class of dynamic systems with external disturbances and actuator faults, a novel observer which can estimate the state and the fault signal simultaneously is proposed. The estimation technology is applicable for the linear system with actuator fault and nonlinear system with Lipschitz conditions. Firstly, the sufficient existences conditions of the observer are discussed;...
In this paper, aiming at a class of systems subject to both state and input uncertainties, in which there is a random intermittent actuator fault, a passive dynamic output feedback fault-tolerant control strategy is proposed. The controller designed in this paper can ensure the stability of fault-free closed-loop system, moreover, can stabilize the closed loop system in finite time and guarantee the...
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