The Experts below are selected from a list of 545880 Experts worldwide ranked by ideXlab platform

Fu Xue Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Phase research of no-drive structure silicon micromachined gyroscope
    2008 IEEE International Conference on Mechatronics and Automation, 2008
    Co-Authors: X.s. Xu, Fu Xue Zhang
    Abstract:

    The phase picking up technique of silicon micromachined gyroscope used for rotating carrier is introduced. When the sensitivity axis is parallel to the deflexion plane, silicon pendulum will get the biggest Coriolis force, and the outputs are the peak value of the sine wave. However, when the sensitivity axis is Perpendicularity to the deflexion plane, the outputs are the zero value of the sine wave. The self-rotated signal of the carrier (accelerometer) as benchmark, comparing to the output signal phase of the carrier and the gyroscope, then subtract the lagged value from the phase difference of the accelerometer and the gyroscope, we can confirm the real deflecting direction of the carrier in the space.

  • Phase Processing of No-Drive Structure Silicon Micromachined Gyroscope
    2008 IEEE Pacific-Asia Workshop on Computational Intelligence and Industrial Application, 2008
    Co-Authors: Xiaosong Xu, Hailin Liu, Fu Xue Zhang
    Abstract:

    The phase picking up technique of silicon micromachined gyroscope used for rotating carrier is introduced. When the sensitivity axis is parallel to the deflexion plane, silicon pendulum will get the biggest Coriolis force, and the outputs are the peak value of the sine wave. However, when the sensitivity axis is Perpendicularity to the deflexion plane, the outputs are the zero value of the sine wave. The self-rotated signal of the carrier (accelerometer) as benchmark, comparing to the output signal phase of the carrier and the gyroscope, then subtracting the lagged value from the phase difference of the accelerometer and the gyroscope, we can confirm the real deflecting direction of the carrier in the space.

  • Research on Principle and Phase of Silicon Micromachined Gyroscope Using for Rotating Carrier
    2007 International Conference on Information Acquisition, 2007
    Co-Authors: Ling Wang, Fu Xue Zhang
    Abstract:

    The principle and phase picking-up technique of silicon micromachined gyroscope using for rotating carrier is proposed in the paper. Be differ from conventional gyroscope, this one hasn't self-driver part and the configuration is simple. According to the principle of the gyroscope, when the sensitivity axis parallel to the deflexion plan, silicon pendulum will get the biggest Coriolis force, and the output is the peak value of the sine wave; when the sensitivity axis Perpendicularity to the deflexion plan, the output is the zero value of the sine wave. So taking the input signal of the gyroscope as the benchmark, we will get the direction of the sensitive axis by comparing the output signal phase in benchmark coordinate. Moreover we can confirm the circumrotating plan and the deflexion direction of the rotating carrier in the space.

Alain Vautrin - One of the best experts on this subject based on the ideXlab platform.

  • Accurate comparative determination of the in-plane shear modulus of T300/914 by the iosipescu and 45° off-axis tests
    Composites Science and Technology, 1994
    Co-Authors: Fabrice Pierron, Alain Vautrin
    Abstract:

    Abstract This paper compares the initial shear modulus distributions obtained from [0]20, [90]20 and [0/90]5s Iosipescu and [45]20 off-axis T300/914 specimens. The data reduction processes for the two tests are presented together with a finite element analysis of the Iosipescu test that enables the determination of correction factors to account for the non-homogeneity of the stress and strain fields along the notch line. A preliminary 45° off-axis test is performed to determine a region of linear elastic behaviour within which the samples are each tested four times. Close examination of the test data leads to a detailed discussion of the quality of the Iosipescu specimens in terms of Perpendicularity of the loading surfaces to the lateral faces. The degrees of scatter due to the mechanical loading conditions and to the sample to sample variations are compared.

  • accurate comparative determination of the in plane shear modulus of t300 914 by the iosipescu and 45 off axis tests
    Composites Science and Technology, 1994
    Co-Authors: Fabrice Pierron, Alain Vautrin
    Abstract:

    Abstract This paper compares the initial shear modulus distributions obtained from [0]20, [90]20 and [0/90]5s Iosipescu and [45]20 off-axis T300/914 specimens. The data reduction processes for the two tests are presented together with a finite element analysis of the Iosipescu test that enables the determination of correction factors to account for the non-homogeneity of the stress and strain fields along the notch line. A preliminary 45° off-axis test is performed to determine a region of linear elastic behaviour within which the samples are each tested four times. Close examination of the test data leads to a detailed discussion of the quality of the Iosipescu specimens in terms of Perpendicularity of the loading surfaces to the lateral faces. The degrees of scatter due to the mechanical loading conditions and to the sample to sample variations are compared.

Pei Jiang Yuan - One of the best experts on this subject based on the ideXlab platform.

  • Perpendicularity adjustment end effector for aeronautical drilling robot
    IEEE International Conference on Intelligent Robots and Systems, 2016
    Co-Authors: Dong-dong Chen, Pei Jiang Yuan, Zhen Yun Shi, Tian-miao Wang, Yuanwei Liu, Minqing Lin
    Abstract:

    The quality of holes has important influence on the mechanical strength, assembly quality and life of aircraft, and inferior quality holes may even cause airplane crash and casualties. The perpendicular accuracy of holes during drilling is crucial one of all the factors influencing the quality of holes. In order to improve the perpendicular accuracy during drilling, this paper presented an attitude adjustment mechanism and attitude adjustment algorithm for the end effector. For the mechanism, it adjusts the drill bit attitude by using double eccentric discs and a spherical pair. After the surface normal vector at drilling point is obtained, double eccentric discs will rotate define angels calculated by using attitude adjustment algorithm based on the shortest time principle to achieve the coincidence of the surface normal vector and the drill bit axis vector if the angle between the normal vector and drill bit axis vector is greater than 0.5°. To demonstrate the method mentioned above, simulation and experiment are carried out on the aeronautical drilling robot. The results show that the attitude adjustment mechanism and attitude adjustment algorithm can increase the perpendicular accuracy of holes during drilling and satisfy the demand in automatic aircraft assembly.

  • Improvements of robot positioning accuracy and drilling Perpendicularity for autonomous drilling robot system
    2015 IEEE International Conference on Robotics and Biomimetics (ROBIO), 2015
    Co-Authors: Pei Jiang Yuan, Yong Li
    Abstract:

    The low accuracy of Autonomous Drilling Robot System (ADRS) has precluded their usage in aircraft assembly. Aiming at improving the accuracy of ADRS, three efforts are made in this paper. Firstly, a novel surface normal measurement and attitude adjusting method are proposed to guarantee the Perpendicularity of holes. Secondly, an improvement compensation method is made for absolute positioning accuracy of industrial robot by using Gauss-Newton method. Thirdly, during the calibration of tool center point(TCP), which is one of the key technologies of offline programming control system, two balls are used in this method to solve the problem of low accuracy and inefficiency of traditional method using pointed end. Finally, both simulations and experiments are conducted to test the effect of the improvements and the results prove the improvements are effective.

  • Surface normal measurement in the end effector of a drilling robot for aviation
    Proceedings - IEEE International Conference on Robotics and Automation, 2014
    Co-Authors: Pei Jiang Yuan, Qi Shen Wang, Tian-miao Wang, Cheng-kun Wang, Bo Song
    Abstract:

    Aiming at the robot drilling Perpendicularity in aircraft assembly, a surface normal measurement method is presented and a drilling end effector is designed. Four laser ranging sensors are uniformly distributed around the drill to measure the surface normal as four non-coplanar points define a unique circumscribed sphere and the sphere center can be calculated. By this principle, the method measures four points coordinates on the curved surface in the drilling area using four laser ranging sensors. If the four laser ranging sensors are close enough to each other, it is reasonable to assume that the drilling point is on the sphere surface. Therefore, the connection line of the sphere center and the drilling point is the surface normal at the drilling point. The angle θ between the normal and the axis of the drill is calculated and if θ is larger than 0.5 degree, the drilling end effector will adjust the attitude of the drill to make sure θ is smaller than 0.5 degree to meet the requirement in aircraft assembly. A novel adjusting mechanism is designed in the end effector which can keep drill vertex immobile when adjusting drill position. Thus, it is not required to remove the drill vertex to the mark point. Simulation results of three kinds curved surfaces show that the surface normal measurement method is accurate and efficient. Experiments on aviation drilling system results also demonstrate the adjusting mechanism is effective with high accuracy.

  • A micro-adjusting attitude mechanism for autonomous drilling robot end-effector
    Science China Information Sciences, 2014
    Co-Authors: Pei Jiang Yuan, Qi Shen Wang, Zhen Yun Shi, Dong-dong Chen, Tian-miao Wang, Cheng-kun Wang, Li Heng Shen
    Abstract:

    Drilling end-effector is a key unit in autonomous drilling robot. The Perpendicularity of the hole has an important influence on the quality of airplane assembly. Aiming at the robot drilling Perpendicularity, a micro-adjusting attitude mechanism and a surface normal measurement algorithm are proposed in this paper. In the mechanism, two rounded eccentric discs are used and the small one is embedded in the big one, which makes the drill's point static when adjusting the drill's attitude. Thus, removal of drill's point position after adjusting the drill attitude can be avoided. Before the micro-adjusting progress, four non-coplanar points in space are used to determine a unique sphere. The normal at the drilling point is measured by four laser ranging sensors. The adjusting angles at which the motors should be rotated to adjust attitude can be calculated by using the deviation between the normal and the drill axis. Finally, the motors will drive the two eccentric discs to achieve micro-adjusting progress. Experiments on drilling robot system and the results demonstrate that the adjusting mechanism and the algorithm for surface normal measurement are effective with high accuracy and efficiency.

  • Intelligent surface normal measurement method of end effector for the aeronautical drilling robot
    2014 International Conference on Multisensor Fusion and Information Integration for Intelligent Systems (MFI), 2014
    Co-Authors: Dong-dong Chen, Pei Jiang Yuan, Qi Shen Wang, Cheng-kun Wang, Tiammiao Wang, Fengchao Wang
    Abstract:

    In order to solve the Perpendicularity of robotic drilling in the aircraft assembly, this paper proposed a novel surface normal measurement method for the aeronautical drilling robot. Firstly, vision location module is used to mark the drilling point and get the coordinate of drilling point. Meanwhile, four laser range sensors start to measure the distance between the emitting laser points and their subpoints on the workpiece surface. Thus, the coordinates of four subpoints can be obtained. According to the four subpoints and drilling point, line or circle are used to approach two curves through the drilling point on the workpiece surface. Two tangent vectors of the two curves at drilling point can be obtained. Then the normal vector of drilling point can be calculated from the cross product of two tangent vectors. The angle between the normal vector and drill axis vector can be obtained. If the angle is greater than 0.5 degree, the two eccentric discs will rotate definite angles to meet the requirement. Finally, the simulation results and experimental results on the aeronautical drilling robot show that the surface normal measurement method is valid and effective to meet the requirement in aircraft assembly.

Fabrice Pierron - One of the best experts on this subject based on the ideXlab platform.

  • Accurate comparative determination of the in-plane shear modulus of T300/914 by the iosipescu and 45° off-axis tests
    Composites Science and Technology, 1994
    Co-Authors: Fabrice Pierron, Alain Vautrin
    Abstract:

    Abstract This paper compares the initial shear modulus distributions obtained from [0]20, [90]20 and [0/90]5s Iosipescu and [45]20 off-axis T300/914 specimens. The data reduction processes for the two tests are presented together with a finite element analysis of the Iosipescu test that enables the determination of correction factors to account for the non-homogeneity of the stress and strain fields along the notch line. A preliminary 45° off-axis test is performed to determine a region of linear elastic behaviour within which the samples are each tested four times. Close examination of the test data leads to a detailed discussion of the quality of the Iosipescu specimens in terms of Perpendicularity of the loading surfaces to the lateral faces. The degrees of scatter due to the mechanical loading conditions and to the sample to sample variations are compared.

  • accurate comparative determination of the in plane shear modulus of t300 914 by the iosipescu and 45 off axis tests
    Composites Science and Technology, 1994
    Co-Authors: Fabrice Pierron, Alain Vautrin
    Abstract:

    Abstract This paper compares the initial shear modulus distributions obtained from [0]20, [90]20 and [0/90]5s Iosipescu and [45]20 off-axis T300/914 specimens. The data reduction processes for the two tests are presented together with a finite element analysis of the Iosipescu test that enables the determination of correction factors to account for the non-homogeneity of the stress and strain fields along the notch line. A preliminary 45° off-axis test is performed to determine a region of linear elastic behaviour within which the samples are each tested four times. Close examination of the test data leads to a detailed discussion of the quality of the Iosipescu specimens in terms of Perpendicularity of the loading surfaces to the lateral faces. The degrees of scatter due to the mechanical loading conditions and to the sample to sample variations are compared.

X.s. Xu - One of the best experts on this subject based on the ideXlab platform.

  • Phase research of no-drive structure silicon micromachined gyroscope
    2008 IEEE International Conference on Mechatronics and Automation, 2008
    Co-Authors: X.s. Xu, Fu Xue Zhang
    Abstract:

    The phase picking up technique of silicon micromachined gyroscope used for rotating carrier is introduced. When the sensitivity axis is parallel to the deflexion plane, silicon pendulum will get the biggest Coriolis force, and the outputs are the peak value of the sine wave. However, when the sensitivity axis is Perpendicularity to the deflexion plane, the outputs are the zero value of the sine wave. The self-rotated signal of the carrier (accelerometer) as benchmark, comparing to the output signal phase of the carrier and the gyroscope, then subtract the lagged value from the phase difference of the accelerometer and the gyroscope, we can confirm the real deflecting direction of the carrier in the space.