Harbin Institute of Technology

Other

Harbin Engineering University

Harbin Medical University

Harbin Frp Institute Co., Ltd.

Yang Liu

Jiubin Tan

Fazhi Song

Xinyu Zhang

Jie Guo

Kai Wang

Xilin Sun

Cong Chao Li

Jie Yang

Lili Yang

Yipeng Cao

Zhaoguo Han

Chen Liu

Pengyu Sun

Chundong Fei

Xu Zhan

Ruiqing Yang

Zexi Wu

Yunfeng Zhang

Hua Zhang

Xiang Liu

Yongchun Liu

Diyang Hou

Mingxing Ke

Liang Zhao

Jiliang Jiang

Ning Cui

Qian Miao

Zhen Quan

Xinglin Chen

Kaixin Liu

Aichen Wu

Zunyu Xiao

Weifeng Wang

Shuaiqi Chen

Ruifeng Wang

Chuan Liu

A method and apparatus for acquiring aerodynamic noise of a compressor, a medium, and a product are provided. The method includes: performing inverse Fourier transform on a known frequency-domain noise spectrum to obtain known time-domain noise data, then predicting unknown time-domain noise using a time series neural network, obtaining finer time-frequency noise data in combination with the known time-frequency noise data, and finally, performing Fourier transform on the finer time-frequency noise data to obtain new frequency-domain noise data. Limitations of a limited time step and a total simulation time on the acquisition of aerodynamic noise data in traditional numerical calculation of aerodynamic noise can be overcome. Finer aerodynamic noise data can be acquired rapidly and accurately. The frequency resolution of the noise spectrum can be increased, and reducing the consumption of computing resources and saving manpower and material resources can be achieved.

Method and apparatus for acquiring aerodynamic noise of compressor, medium, and product

A learning control system includes a movement trajectory generation unit, a learning control unit, a feedback control unit, and an uncertainty compensation unit. The movement trajectory generation unit includes a movement trajectory generator; the movement trajectory generator is configured to generate a reference movement trajectory; a position measured signal is subtracted from the reference movement trajectory to obtain a position error signal which is input to the learning control unit; the learning control unit is configured to generate a feed-forward signal which is added with the position error signal to obtain a corrected error signal; and the corrected error signal is input to the feedback control unit; the feedback control unit includes a feedback controller configured to generate a feedback control quantity which is input to the uncertainty compensation unit; and the uncertainty compensation unit is configured to generate the position measured signal.

Learning control system and method for ultra-precision lithographic apparatus based on uncertainty compensation

A learning control system for a nano-precision motion stage comprises a closed-loop feedback section including a motion trajectory generator, a feedback controller, a motion stage, and a first Fourier transformer; and a feedforward section including a second Fourier transformer, a learning controller, an iteration backward shift operator, and a Fourier inverse transformer. An iteration experiment count j is initialized as j=1, and a j-th frequency domain feedforward signal is initialized to 0; the system is run to collect a frequency domain error signal and a frequency domain position measurement signal; a (j+1)-th frequency domain feedforward signal is updated; and an iteration experiment count j is incremented by 1. The present disclosure can effectively suppress the influence of external noise and disturbances, and improve convergence performance. Moreover, the present disclosure requires less computation, achieves simple determination of learning gains and strong robustness, and is convenient for engineering applications.

Learning control system and method for nano-precision motion stage

A short-travel nanoscale motion stage and a method for measuring thermally-related hysteresis data are provided. A stator unit of a left two-pole electromagnet and stator units of two inchworm motors are fixed on a right side surface of a left foundation frame, and an active unit of the left two-pole electromagnet and actives of the two inchworm motors are fixed on a left side surface of a stage moving component. An active unit of a right two-pole electromagnet is fixed on a right side surface of the stage moving component, while a stator unit of the right two-pole electromagnet is fixed on a left side surface of a right foundation frame. The stage moving component is fixedly mounted on a guide sleeve of an aerostatic guideway. Each of the stator units of the left and right two-pole electromagnets has an eddy current sensor and a hall sensor fixed therein.

Short-travel nanoscale motion stage and method for measuring thermally-related hysteresis data

The present disclosure provides a winding device for producing a fiber composite loop chain and a winding method, and belongs to the field of production equipment. The problem that an existing composite loop chain forming technology has tension defects is solved. The winding device includes a main shaft assembly, a clamp pushing-in mechanism, travel switch assemblies, a mold pushing mechanism, a clamp pulling-out mechanism, a positioning and clamping mechanism and a tension control mechanism which are fixedly connected to a rack. The main shaft assembly includes a driving mechanism, a bearing pedestal, a rotating main shaft, clamp sliding shafts and a supporting block. The driving mechanism is connected with one end of the rotating main shaft, and the other end of the rotating main shaft is connected with the supporting block. The rotating main shaft is connected with the bearing pedestal through a bearing, and the bearing pedestal is fixed to the rack. Two clamp sliding shafts are provided. The two clamp sliding shafts are symmetrically arranged along the rotating main shaft and are in sliding connection with the supporting block, and clamps are installed on the clamp sliding shafts. The winding device and the winding method are mainly used for producing the fiber composite loop chain.

Winding device for producing fiber composite loop chain and winding method

Disclosed is a molecular imaging method for evaluating liver regeneration ability after ALPPS. The method includes steps of: 1) preparing a VX2 rabbit liver cancer model; 2) performing ALPPS for the VX2 rabbit liver cancer model; 3) synthesizing 18F-Fluoromethylcholine (18F-Methylcholine, 18F-FCH); 4) PET/CT imaging and data processing forF-FCH. The disclosure is the first to propose the use of 18F-FCH PET/CT to monitor the proliferative capacity of residual liver, and further indirectly reflect the increased ability of cell membrane synthesis on the basis that 18F-FCH has higher choline metabolism in residual liver tissue, so that the liver regeneration ability after ALPPS is evaluated by the molecular imaging method, thereby providing important new ideas for the clinical selection of ALPPS to choose the best time for second-stage surgery.

Molecular imaging method for evaluating liver regeneration capacity after ALPPS operation

A measurement control system for a multi-shaft supported air floatation platform, the system comprising a load feedback unit (), an execution unit (), a position measurement unit (), a safety protection unit (), a controller (), a rotating motor (), and a linear light source; the load feedback unit comprises M pressure sensors (-) and four differential sensors (-); the execution unit comprises M servo voice coil motors (-) and M servo voice coil motor drivers (-); the position measurement unit comprises a plane grating (-), M linear gratings (-) a linear array CCD (-), a tilt sensor (-), M electronic levels (-), and an indoor GPS (-); the safety protection unit comprises 2M proximity sensors (-) and M temperature sensors (-); and the linear array CCD consists of no few then six CCDs. The system solves the problems of leveling limitations and narrow application range of existing supporting platforms.

Measurement control system for multi-shaft supported air floatation platform

Growing community of inventors

Harbin, China

Yang Liu