Patents by Inventor Jiakun Wu

Jiakun Wu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210026319
    Abstract: A self-adaptive compensation method for feed axis thermal error, which belongs to the field of error compensation in NC machine tools. First, based on laser interferometer and temperature sensor, the feed axis thermal error test is carried out; following, the thermal error prediction model, based on the feed axis thermal error mechanism, is established and the thermal characteristic parameters in the model are identified, based on the thermal error test data; next, the parameter identification test is carried out, under the preload state of the nut; next, the adaptive prediction model is established, based on the thermal error prediction model, while the parameters in the measurement model are identified; finally, adaptive compensation of thermal errors is performed, based on the adaptive error prediction model, according to the generated feed axis heat.
    Type: Application
    Filed: February 21, 2019
    Publication date: January 28, 2021
    Inventors: Kuo LIU, Yongqing WANG, Jiakun WU, Haining LIU, Mingrui SHEN, Bo QIN, Haibo LIU
  • Patent number: 10900779
    Abstract: A method for the rapid detection of the linear axis angular error of an NC machine tool, belongs to the technical field of NC machine tool testing. Firstly, the measuring device is mounted on the linear axis. Then, the linear axis moves at three different speeds at a constant speed, and the upper measurement system automatically performs multi-channel acquisition and storage of the motion measurement's point measurement data. Then, based on the same geometric error signal, it is decomposed into the different frequency components, and the measurement angle error is filtered at the different speeds. Finally, the measurement angle errors at the three speeds after filtering are superimposed to complete the rapid measurement of the linear axis angular error of the machine tool. The measurement efficiency is high and data processing capability is strong.
    Type: Grant
    Filed: January 23, 2018
    Date of Patent: January 26, 2021
    Assignee: DALIAN UNIVERSITY OF TECHNOLOGY
    Inventors: Yongqing Wang, Kuo Liu, Jiakun Wu, Haibo Liu, Zhisong Liu, Haining Liu
  • Publication number: 20200232885
    Abstract: A reliability evaluation method for CNC machine tools based on Bayes and fault tree, belongs to the technical field of reliability evaluation for CNC machine tools. First, the CNC machine tool is regarded as a system composed of subsystems, and the subsystem fault data of the same production batch is used as the prior information. Next, the joint probability density function of the failure rate of each failure subsystem is used as the likelihood function of the field data, and the logarithmic inverse Gamma distribution is used as the conjugate prior distribution of the reliability. Based on this, the joint prior distribution probability density function of Weibull distribution size and shape parameters is determined Finally, the fault tree model is established. This can increase the sample size of the prior information, eliminate the complicated sample compatibility test, and ensure the compatibility of the prior information.
    Type: Application
    Filed: August 28, 2018
    Publication date: July 23, 2020
    Inventors: Kuo LIU, Yongqing WANG, Jiakun WU, Haoqi DONG, Te LI, Haibo LIU
  • Publication number: 20200064125
    Abstract: A rapid detection method for the geometric accuracy of the linear motion axis of an NC machine tool, uses accelerometers to measure the acceleration perpendicular to the direction of motion when the linear motion axis moves at a uniform speed. Firstly, the measuring device is mounted on the linear motion axis, and the upper measurement system automatically performs multi-channel acquisition and storage of the motion point acceleration data. Then, filter the acceleration data at the different speeds. Finally, the displacement data is obtained by quadratic integration of the filtered acceleration data in the time domain. Then calculate the straightness of the linear motion axis using the End Point Fit method, and complete the rapid measurement of the straightness of the linear motion axis of the machine tool. This can realize the rapid measurement of the geometric accuracy of the linear motion axis of the machine tool.
    Type: Application
    Filed: January 23, 2018
    Publication date: February 27, 2020
    Inventors: Yongqing WANG, Haibo LIU, Jiakun WU, Kuo LIU, Kang KUANG, Dawei LI
  • Publication number: 20200064126
    Abstract: A method for the rapid detection of the linear axis angular error of an NC machine tool, belongs to the technical field of NC machine tool testing. Firstly, the measuring device is mounted on the linear axis. Then, the linear axis moves at three different speeds at a constant speed, and the upper measurement system automatically performs multi-channel acquisition and storage of the motion measurement's point measurement data. Then, based on the same geometric error signal, it is decomposed into the different frequency components, and the measurement angle error is filtered at the different speeds. Finally, the measurement angle errors at the three speeds after filtering are superimposed to complete the rapid measurement of the linear axis angular error of the machine tool. The measurement efficiency is high and data processing capability is strong.
    Type: Application
    Filed: January 23, 2018
    Publication date: February 27, 2020
    Inventors: Yongqing WANG, Kuo LIU, Jiakun WU, Haibo LIU, Zhisong LIU, Haining LIU
  • Patent number: 5826868
    Abstract: A control system for a material spreading machine pre-determines a machine velocity trajectory plan so that the velocity and acceleration of the machine down the spreading table can be controlled in real time. The control system includes encoders which provide real time information as to the actual machine velocity and material feed rate so that dynamic feedback and control of the spread can be maintained. Data from the machine velocity encoder is used to calculate the actual position of the machine along the table during the spread.
    Type: Grant
    Filed: December 26, 1995
    Date of Patent: October 27, 1998
    Assignee: Saber Industries, Inc.
    Inventors: Michael Dale Russell, David Alan Berezov, Jiakun Wu