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A ring type standing wave ultrasonic motor using cantilever type longitudinal transducers

Journal of Harbin Institute of Technology(New Series) 2011年第1期18卷 52-56页

作者：刘英想刘军考陈维山石胜君 State Key Laboratory of Robotics and System Harbin Institute of Technology

The disadvantages of classic ring type ultrasonic motor were *** obtain large mechanical output power,a ring type standing wave ultrasonic motor using cantilever type longitudinal transducers was *** are four pairs of cantilevers on one side of the ring,and four PZT ceramics are set between each pair of cantilevers.A screw fastened the PZT ceramics and cantilevers together to form a longitudinal *** bending vibration mode of the ring is excited by the stretching vibration of the PZT ***,linear simple harmonic motions are achieved at the particle on the *** the driving force is the frictional force between rotor and *** working principle of the proposed motor was *** ring and the longitudinal transducer were designed with *** sensitive parameters of resonant frequency of the transducer and ring could be gained with modal *** longitudinal vibration modal of transducer and bending vibration modal of ring were degenerated,and the motion trajectories of nodes on the teeth were *** results of this paper could guide the development of this new type of motor.

关键词： ultrasonic motor standing wave ring type vibration characteristic FEM

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Actuating mechanism and design of a T-type linear ultrasonic motor

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Journal of Harbin Institute of Technology(New Series) 2011年第2期18卷 43-46页

作者：刘英想刘军考陈维山石胜君 State Key Laboratory of Robotics and System Harbin Institute of Technology

To take advantage of merits of higher output-power and efficiency of bolt-clamped transducer,a T-type linear ultrasonic motor was proposed in this *** proposed motor contained a horizontal transducer and a vertical *** horizontal transducer included two exponential shape horns,and the vertical transducer contained one exponential shape *** the horns intersected at tip ends where a driving foot was *** longitudinal vibrations of transducers were excited by the stretching vibration of PZT *** vibrations were superimposed in the motor and generated elliptical trajectory at the driving *** actuating mechanism of the proposed motor was *** two working modals of the motor were gained with *** resonant frequencies of two working modals were degenerated by adjusting the structural *** motion trajectory of nodes on the driving foot was gained by transient *** vibration amplitude of node on the driving foot indicates that the proposed motor has potential good output *** results verify the feasibility of the proposed design and provide instructions for the development of the new ultrasonic motor.

关键词： ultrasonic motor linear T-type longitudinal transducer FEM

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On set-point tracking control of dexterous robot hand

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Journal of Harbin Institute of Technology(New Series) 2011年第5期18卷 61-64页

作者：姜力潘军 State Key Laboratory of Robotics and System Harbin Institute of Technology

A model-free set-point tracking control approach of multi-fingered robot hand is *** set-point tracking controller,which has the structural form of PD controller,is composed with a combination of feedforward term,feedback term and saturation control *** controller does not require the explicit use of dynamic modeling *** performed on the HIT/DLR hand demonstrate the effectiveness of the proposed approach in performance improvement and real-time application.

关键词： tracking control robot hand kinematics

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Optimal measurement configurations for kinematic calibration of six-DOF serial robot

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Journal of Central South University 2011年第3期18卷 618-626页

作者：黎田孙奎谢宗武刘宏 State Key Laboratory of Robotics and System Harbin Institute of Technology Institute of Robotics and Mechatronics G erman Aerospace Center

An optimal measurement pose number searching method was designed to improve the pose selection *** optimal robot measurement configurations were added to an initial pre-selected optimal configuration set to establish a new configuration set for robot calibration one by *** root mean squares (RMS) of the errors of each end-effector poses after being calibrated by these configuration sets were *** optimal number of the configuration set corresponding to the least RMS of pose error was then *** based on those poses selected by this algorithm can get higher end-effector accuracy,meanwhile consumes less *** optimal pose set including optimal 25 measurement configurations is found during the *** errors after calibration by using these poses are 1.54,1.61 and 0.86 mm,and better than those before calibration which are 7.79,7.62 and 8.29 mm,even better than those calibrated by the random method which are 2.22,2.35 and 1.69 mm in directions X,Y and Z,respectively.

关键词： serial robot pose selection pose number kinematic calibration observability index

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New Generalized ESPRIT for Direction Estimation and Its Mathematical Link to RARE Method

New Generalized ESPRIT for Direction Estimation and Its Math...

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2012 IEEE 11th International Conference on Signal Processing(ICSP 2012)

作者： Guangmin Wang Jingmin Xin Jiayi Wu Jiasong Wang Nangning Zheng Akira Sano Institute of Artificial Intelligence and Robotics Xi'an Jiaotong University Xi'an Jiaotong University Suzhou Academy State Key Laboratory of Astronautic Dynamics Department of System Design Engineering Keio University

The generalized ESPRIT （GESPRIT） method extends the conventional ESPRIT estimator to estimate the directions-of-arrival （DOAs） of multiple incident signals by using the array with more general geometrical configurations, where the translational invariance structure is not required. Unfor-tunately, the GESPRIT has serious ambiguous DOA estimates in some scenarios, and its performance degrades severely at low signal-to-noise ration （SNR） and with a small number of snapshots. Although a polynomial version of a new GESPRIT （NGESPRIT） method was given, but its derivation and estimation performance are unavailable in published literature. In this paper, in order to overcome the ambiguity of the GESPRIT and improve the estimation performance, the NGESPRIT method is derived explicitly. Moreover, the equivalence between the proposed NGESPRIT method and the rank reduction （RARE） method is clarified, while the former is more computationally efficient than the latter. Finally the effectiveness of the NGESPRIT method is substantiated through numerical examples.

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Low Complexity Subspace-Based Two-Dimensional Direction-of-Arrivals Tracking of Multiple Targets

Low Complexity Subspace-Based Two-Dimensional Direction-of-A...

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2012 IEEE 11th International Conference on Signal Processing(ICSP 2012)

作者： Changnong Liu Guangmin Wang Jingmin Xin Jiasong Wang Nanning Zheng Akira Sano Institute of Artificial Intelligence and Robotics Xi'an Jiaotong University Xi'an Jiaotong University Suzhou Academy State Key Laboratory of Astronautic Dynamics Department of System Design Engineering Keio University

This paper deals with the problem of tracking the two-dimensional (2-D) direction-of-arrivals (DOAs) (i.e., azimuth and elevation angles) of multiple moving targets with crossover points on their trajectories, and we propose an new computationally efficient subspace-based 2-D DOA tracking algorithm for the L-shaped sensor array structured by two uniform linear arrays (ULAs). First, a new computationally efficient cross-correlation based 2-D DOA estimation with automatic pairmatching (CODEC) batch method is developed for noncoherent narrowband signals, where the computationally expensive procedures of eigendecomposition in subspace estimation and pair-matching of the estimated azimuth and elevation angles are avoided. Then a new 2-D DOA tracking algorithm is proposed, the association of the estimated azimuth and elevation angles at two successive time instants is accomplished by employing a dynamic mode and the Luenberger state observer. The simulation results show that the proposed tracking algorithm has good adaptability and tracking capability.

关键词： direction estimation, eigendecomposition, pair-matching, uniform linear array, state observer

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Two-Dimensional Direction Tracking of Coherent Signals with Two Parallel Uniform Linear Arrays

Two-Dimensional Direction Tracking of Coherent Signals with ...

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2012 IEEE 11th International Conference on Signal Processing(ICSP 2012)

作者： Jiayi Wu Jingmin Xin Guangmin Wang Jiasong Wang Nangning Zheng Akira Sano Institute of Artificial Intelligence and Robotics Xi'an Jiaotong University Xi'an Jiaotong University Suzhou Academy State Key Laboratory of Astronautic Dynamics Department of System Design Engineering Keio University

In some practical applications, the two-dimensional (2-D) direction-of-arrivals (DOAs) of incident signals should be estimated adaptively or the time-varying 2-D DOAs should be tracked promptly from the noisy array data, and multipath propagation is usually encountered due to various reflections, where the incident signals are caused to be coherent (i.e., fully correlated). In this paper, we propose a new computationally efficient subspace-based adaptive algorithm for 2-D DOA tracking of multiple coherent incident signals by using two parallel uniform linear arrays (ULAs). In the proposed algorithm, the computationally expensive eigendecomposition and the pair-matching of estimated 2-D DOAs are avoided, and the association of estimated 2-D DOAs at two successive time instants is accomplished by employing the Luenberger observer and dynamic model of direction trajectories. The effectiveness of the proposed algorithm are verified through numerical examples.

关键词： Two-dimensional direction-of-arrival estimation adaptive filtering algorithm pair-matching Luenberger observer

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Research on the kinematic method of 3D visual window for surgical robot in dynamic vision

Research on the kinematic method of 3D visual window for sur...

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2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012

作者： Yu, Lingtao Wang, Zhengyu Yu, Peng Wang, Tao Song, Huajian College of Mechanical and Electrical Engineering Harbin Engineering University Harbin Heilongjiang Province China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin Heilongjiang Province China

ISBN: (纸本)9781467312776

This article has analysed the problem of controlling the movement of the 3D visual window for the surgery robot operated by the doctors in their habits, and found out the relationship of position and pose between the objective window and the current window, and established kinematic model of the robot arm with a laparoscope, and then analysed the workspace of the end of the laparoscope. According to the above, established the kinematic model of the 3D visual window based on the dynamic vision, the analytical expressions of its kinematic algorithm have been derived, and verified it through a kinematic sample. © 2012 IEEE.

关键词： Laparoscopy

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Estimation of the number of narrowband signals in the presence of multipath propagation

Estimation of the number of narrowband signals in the presen...

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Sensor Array and Multichannel Signal Processing Workshop

作者： Hao Tao Jingmin Xin Jiasong Wang Nanning Zheng Akira Sano Institute of Artificial Intelligence and Robotics Xian Jiaotong University Xi'an China State Key Laboratory of Astronautic Dynamics Xi'an China Department of System Design Engineering Keio University Yokohama Japan

In this paper, we address with the problem of detection the number of narrowband signals impinging on a uniform linear array (ULA) in the presence of multipath propagation. Firstly, by forming a differencing matrix from the array covariance matrix to eliminate the effects of uncorrelated incident signals and additive noises, a combined matrix is constructed from this differencing matrix to decorrelate the coherence of signals. Since the number of coherent signals is revealed as the rank of this resultant matrix, a singular value based ratio criterion is proposed to estimate the number of coherent signals. Then, another singular value based ratio criterion is also presented to determine the number of uncorrelated signals from the array covariance matrix. The notable advantage of the proposed method is that it can detect more signals compared to some existing methods, and the number of signals resolved by our method can exceed the number of array sensors.

关键词： Arrays Covariance matrix Signal to noise ratio Estimation Additive noise Narrowband Decorrelation

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The Optimization of Spring Stiffness for Passive Dynamic Walker

The Optimization of Spring Stiffness for Passive Dynamic Wal...

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IEEE/RSJ International Conference on Intelligent robotics and systems

作者： Biao Hu Mingguo Zhao State Key Laboratory of Robotics and System (HIT) and Department of Automation Tsinghua University 100084 Beijing P.R. China Department of Automation Tsinghua University 100084 Beijing P.R.China

ISBN: (纸本)9781467317375

On a passive dynamic walker, we find that an appropriate spring placed on the mass center of two legs can greatly improve the walker's walking performance, which includes its walking speed, disturbance rejection ability and step length. However, the extent to which spring influences these properties is unknown and how to choose an appropriate spring stiffness to achieve optimal walking performance still needs to be discussed. In this paper, we present a study on the effect of spring on these properties by constructing a synthesize index P to assess the walking performance. Through numerical simulation on three models, we find the walker with spring has a better walking performance over a pure passive dynamic walker and the extension spring on the mass center of two legs can improve a walker's overall walking performance much better.

关键词： Spring walking the extension spring Walkers springs Device Spring Spring season walking spring stiffness Pedestrians step size

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