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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...
A novel identification algorithm is presented in this paper for neuro-fuzzy based single-input-single-output (SISO) Wiener model with colored noises. The independent identical distribution (iid) Gaussian random signals are adopted to identify the Wiener system, leading to the separation of linear part from nonlinear counterpart in the identification problem. Therefore, correlation analysis method...
The increasingly important data-intensive scientific discovery presents a critical question to the high performance computing (HPC) community - how to efficiently support these growing scientific big data applications with HPC systems that are traditionally designed for big compute applications? The conventional HPC systems are computing-centric and designed for computation-intensive applications...
The data volume of many scientific applications has substantially increased in the past decade and continues to increase due to the rising needs of high-resolution and fine- granularity scientific discovery. The data movement between stor- age and compute nodes has become a critical performance factor and has attracted intense research and development attention in recent years. In this paper, we propose...
In our previous research, four non-uniform contact types and SMEs were studied firstly to simulate the possible non-uniform contact statuses induced by the real machined motor rotor. By inspecting the results of the non-uniform contact analyses, different incomplete contact type rotors with different contact rates will be designed accordingly in this paper. The designed method is to make gap slots...
Recent advancements in flash-based solid state drive (SSD) make it a highly desirable storage device, especially for data-intensive applications. There are significant more SSDs used in data centers and high performance computing systems. SSDs perform one or two orders better than traditional hard disk drives generally. However, the performance of random writes on SSDs, especially small random writes,...
The internal turbine mechanism is a new sensor that can be used for independent velocity measurement of underwater high speed moving body. It is a meaningful study when the cavitation flow field around and trajectory changes of the high speed moving body was taken into consideration. The parameterization of turbine mechanism was done at first. Then the surrounding flow field was analyzed and the CFD...
The dynamic performance requirements of the developed school bus was introduced. The forward-facing vehicle simulation model was established and used to simulate four powertrain configurations in three driving cycles. Simulation results shows merits and faults of four powertrain configurations in dynamic performance, all-electric range, fuel consumption and electricity consumption. A series plug-in...
Parallel and distributed file systems are widely used to provide high throughput in high-performance computing and Cloud computing systems. To increase the parallelism, I/O requests are partitioned into multiple sub-requests (or 'flows') and distributed across different data nodes. Therefore the completion time of an I/O request depends on the slowest sub-request and the performance of file systems...
The performances of the handling and stability and ride comfort have important influences on the bus design. To analysize them, the whole vehicle flexible model and road model are built by ADAMS software, and the performances of the original bus are simulated, the real vehicle tests are done to verify the simulation results. Acorrding to the universality design requirements of a bus enterprise, the...
Web-based online submission of computer aided design (CAD) models for prototype parts is getting popular among service bureaus and gaining wider acceptance among rapid prototyping users. In the web based rapid prototyping (RP), an instant quote needs to be generated for an arbitrary polygonal model (usually in STL format). Hence the manufacturability analysis of polygonal models is critical in automating...
This paper examines what affects government credit information systems diffusion. Based on Technology-Organization-Environment framework, Technology Acceptance Model, Innovations Diffusion Theory, and Institutional Theory, we propose a model of affecting government credit information systems diffusion under China E-government circumstance. Data collected from a survey in Shanghai are analyzed with...
Comprehensive consideration of the financial indicators and non-financial factors, establishing the effective financial early-warning system is the important aspect of modern enterprise financial management. On one hand, this paper based on the AHP method makes qualitative indexes quantitative, and thinks the non-financial factors have a influence on financial early-warning system; On the other hand,...
Performance issues of multi-tier Web services have been studied extensively in recent years. Performance modeling and prediction under failure of multi-tier architectures, however, is not well addressed yet. We propose a novel model named Performance under failure of multi-tier architecture, or PerFAMA in short, to address this issue. We first show that the multi-tier architecture with failure considerations...
Modeling, simulation analysis of vertical and lateral dynamics of an electric vehicle driven by two rear hub-motors are presented. An eleven-DOF model of the electric vehicle and the road surface input model are all established. A PID controller is used to adjust yaw rate to the desired one when slip ratio of the driving wheels is less than peak slip ratio. Simulation is performed considering inputs...
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