A5100629069- Advanced Measurement and Metrology Techniques
- Adaptive optics and wavefront sensing
- Optical measurement and interference techniques
- Industrial Technology and Control Systems
- Astronomy and Astrophysical Research
- Image Processing Techniques and Applications
- Geophysics and Sensor Technology
- Underwater Acoustics Research
- Advanced Measurement and Detection Methods
- Optical Systems and Laser Technology
- High-Temperature Coating Behaviors
- Soft Robotics and Applications
- Advanced Sensor and Energy Harvesting Materials
- Reinforcement Learning in Robotics
- Target Tracking and Data Fusion in Sensor Networks
- Vehicle Dynamics and Control Systems
- Acoustic Wave Resonator Technologies
- Effects of Vibration on Health
- Advanced MEMS and NEMS Technologies
- Tropical and Extratropical Cyclones Research
- Simulation and Modeling Applications
- Anomaly Detection Techniques and Applications
- Adaptive Dynamic Programming Control
- Engineering Diagnostics and Reliability
- Mechanical and Optical Resonators
Wuhan University of Technology
2016-2024
Southwest University
2023-2024
State Key Laboratory of Remote Sensing Science
2023
New York University
2023
Institute of Oceanology
2020
Chinese Academy of Sciences
2020
Beijing Aerospace Flight Control Center
2017
Beihang University
2015
University of Arizona
2006-2010
Optical Sciences (United States)
2008-2010
The Giant Magellan Telescope (GMT) uses seven 8.4-m diameter segments to create a giant primary mirror, 25 meters across with focal ratio <i>f</i> /0.7. off-axis will be difficult measure accurately, as they have 14.5 mm departure from the nearest fitting sphere! test configuration adopted large 3.75-m powered mirror fold light path and provide most of aspheric correction, smaller computer generated hologram (CGH) providing additional correction. These optics aligned vibration-insensitive...
We describe methods to correct both symmetric and asymmetric distortion mapping errors induced by null testing elements such as holograms or lenses. show experimental results for direct measurement correction of distortion, well an example result analytical performed using orthogonal set vector polynomials correction. The empirical determination is made via calculation from predicted measured changes aberrations known the point.
The Giant Magellan Telescope achieves 25 meter aperture and modest length using an <i>f</i>/0.7 primary mirror made from 8.4 diameter segments. systems that will be used for measuring the aspheric optical surfaces of these mirrors are in final phase development. This paper discusses overall metrology plan shows details development principal test system - a uses holograms to provide null interferometric surface. provides full measurement off-axis segments by compensating 14.5 mm departure...
The primary mirror for the 25-m Giant Magellan Telescope is made of seven circular segments, each 8.4-m diameter. lack axisymmetry and steep aspheric departure present significant technical challenges metrology. These segments will be measured interferometrically using a complex system mirrors holograms to give null test with high spatial resolution. While analysis predicts this meet requirements, an additional set measurements used corroborate principal interferometric measurement. tests,...
The first of the 8.4 m off-axis segments for primary mirror Giant Magellan Telescope is being manufactured at Steward Observatory Mirror Lab. In addition to manufacture segment, this project includes development a complete facility make and measure all seven segments. We have installed new 28 test tower designed set measurements guide fabrication qualify finished test, laser-tracker measurement ground surface, operational. principal optical full-aperture interferometric with null corrector...
Yilun Zhao, Chen Linyong Nan, Zhenting Qi, Wenlin Zhang, Xiangru Tang, Boyu Mi, Dragomir Radev. Proceedings of the 61st Annual Meeting Association for Computational Linguistics (Volume 1: Long Papers). 2023.
This article concentrates on the data-driven containment problem for a class of nonlinear discrete-time multiagent systems via reinforcement learning. A novel two-layer control architecture is designed. In first layer, reference model introduced with which all signals will reach synchronization. On account critic-actor neural network architecture, an adaptive controller multigradient recursive learning algorithm and less parameters method designed to tackle tracking issues actuator faults....
The design, manufacture and support of the primary mirror segments for GMT build on successful systems MMT, Magellan Large Binocular telescopes. segment its system are based a proven experience gained in existing telescopes has led to significant refinements that will provide even better performance GMT. first 8.4 m been cast at Steward Observatory Mirror Lab, optical processing is underway. Measurement off-axis surface greatest challenge segments. A set tests meets requirements defined...
Rotary kiln is key equipment widely used in the cement, metallurgical and environmental protection industry. The operation state of rotary was largely determined by working condition supporting rollers. This paper models vibration mechanism rollers under crank caused internal thermal process. Based on numerical analysis, a methodology based empirical mode decomposition (EMD) for fault diagnosis proposed. By using EMD, complicated signal can be decomposed into number intrinsic functions...
It is important for huge ship to find the ceramic/metal functional gradient thermal barrier coating materials. A parallel computation model built optimization design of three-dimensional functionally material. According control equation and initial-boundary conditions, heat transfer problem considered, numerical algorithms constructed by adapting difference method. The results shows that material can improve function
Abstract To address the seat shaking issue of a certain vehicle model under high-speed conditions, this article utilizes TPA method, starting from “source-path-response” perspective. By comparing with benchmark vehicles’ lateral parameters, it confirms abnormal vibration frequency as 12Hz in Z direction. Through real testing, validity approach is verified, providing clear optimization solutions and improvement suggestions for subsequent NVH design.
Signal demodulation method of a frequency output resonant gyroscope is studied in this study. It has been major problem micro gyroscopes. The detection elements gyroscopes are two double‐ended tuning forks (DETF). vibratory response DETF periodic signal modulated by both amplitude and frequency. According to the characteristic that gyro vary continuously with time, algorithm designed based on instantaneous analysis. Hilbert transform used solve programmed digital processor (DSP) test circuit...
Violation of Abbe's sine condition is well known to cause coma in axisymmetric imaging systems. We define non-symmetric violations, show how they come from misaligned optical systems, and causes image degradations.
The 25-m f/0.7 primary mirror for the Giant Magellan Telescope is made of seven 8.4 m segments, which will be measured interferometrically using a 3.75-m concave mirror, smaller spherical and computer generated hologram.
A high dimension time dependent model of designing functional gradient thermal barrier coating material is built by using optimization theory. The difference algorithms used to solve inverse heat transfer problems. conduction coefficient founded volume fraction function ceramic or metal. An example calculation shows that the can improve function.
Autonomous Underwater Vehicles (UAVs) have shown significant potential application value in marine environmental surveillance, development, and utilization of resources. However, due to the complex underwater acoustic channel environment relative motion between AUVs, this may lead heavy-tailed non-Gaussian process noise measurement noise, leading increased error Extended Kalman Filter (EKF) fail. In prior studies, we propose a multi-AUV formation hierarchical target location algorithm based...