Integrated adaptive filtering and design for control experiments of flexible structures

A novel method is presented of identifying a state space model and a state estimator for linear stochastic systems from input and output data. The method is primarily based on the relations between the state space model and the finite difference model for linear stochastic systems derived through projection filters. It is proven that least squares identification of a finite difference model converges to the model derived from the projection filters. System pulse response samples are computed from the coefficients of the finite difference model. In estimating the corresponding state estimator gain, a z-domain method is used. First the deterministic component of the output is subtracted out, and then the state estimator gain is obtained by whitening the remaining signal. Experimental example is used to illustrate the feasibility of the method

QCD Radiative Correction to the Hadronic Annihilation Rate of 1+−1^{+-} Heavy Quarkonium

Hadronic annihilation rate of $1^{+-}$ heavy quarkonium is given to next-to-leading order in $\alpha_s$ and leading order in $v^2$ using a recently developed factorization formalism which is based on NRQCD. The result includes both the annihilation of P-wave color-singlet $Q\bar{Q}$ component, and the annihilation of S-wave color-octet $Q\bar{Q}$ component of the quarkonium. The notorious infrared divergences due to soft gluons, i.e., the Logarithms associated with the binding energy, encountered in previous perturbative calculations of $1^{+-}$ quarkonium decays are found to be explicitly cancelled, and a finite result for the decay width to order $\alpha_s^3$ is then obtained.Comment: 15 pages latex (6 figures included). In this revised version a update reference and acknowledgement are include

Projection filters for modal parameter estimate for flexible structures

Single-mode projection filters are developed for eigensystem parameter estimates from both analytical results and test data. Explicit formulations of these projection filters are derived using the pseudoinverse matrices of the controllability and observability matrices in general use. A global minimum optimization algorithm is developed to update the filter parameters by using interval analysis method. Modal parameters can be attracted and updated in the global sense within a specific region by passing the experimental data through the projection filters. For illustration of this method, a numerical example is shown by using a one-dimensional global optimization algorithm to estimate model frequencies and dampings

Single-Mode Projection Filters for Modal Parameter Identification for Flexible Structures

Single-mode projection filters are developed for eigensystem parameter identification from both analytical results and test data. Explicit formulations of these projection filters are derived using the orthogonal matrices of the controllability and observability matrices in the general sense. A global minimum optimization algorithm is applied to update the filter parameters by using the interval analysis method. The updated modal parameters represent the characteristics of the test data. For illustration of this new approach, a numerical simulation for the MAST beam structure is shown by using a one-dimensional global optimization algorithm to identify modal frequencies and damping. Another numerical simulation of a ten-mode structure is also presented by using a two-dimensional global optimization algorithm to illustrate the feasibility of the new method. The projection filters are practical for parallel processing implementation

Large planar maneuvers for articulated flexible manipulators

An articulated flexible manipulator carried on a translational cart is maneuvered by an active controller to perform certain position control tasks. The nonlinear dynamics of the articulated flexible manipulator are derived and a transformation matrix is formulated to localize the nonlinearities within the inertia matrix. Then a feedback linearization scheme is introduced to linearize the dynamic equations for controller design. Through a pole placement technique, a robust controller design is obtained by properly assigning a set of closed-loop desired eigenvalues to meet performance requirements. Numerical simulations for the articulated flexible manipulators are given to demonstrate the feasibility and effectiveness of the proposed position control algorithms

Development of an integrated manufacturing performance measurement and evaluation framework

With the end of the Cold War and the subsequent reduction in defence spending, the Taiwanese defence industry has encountered great difficulties. Recently, the Government announced that at the end of 2006, all military plants should move from the public sector to the private sector. The aim being not only to maintain a manufacturing capability sufficient to ensure the technical competence and resources necessary for an effective and timely response to a mobilisation but also to reduce government infrastructure costs. However, unless the military plants take more aggressive action to assess their management and manufacturing weaknesses effectively, their modernisation efforts will not succeed. This research is concerned with the development of a methodology for manufacturing performance measurement and evaluation to help Taiwanese military plants develop and maintain a competitive advantage. The basic concept of the proposed framework is based on the Balanced Scorecard concept. However, the structure and procedures have been further developed to reflect Taiwan's specific requirements. In particular, the proposed framework provides a structure and tools to tackle a number of key requirements, such as the need to provide both internal and external measures as a means of both qualitatively and quantitatively prioritising and evaluating manufacturing strategic concerns, and the need to show continuously where improvement needs to be made. Industrial case studies have shown that the proposed framework is both feasible and effective when applied within the particular environment of Taiwanese military plants. In addition the proposed framework has highlighted some theoretical and practical problems associated with the design and development of manufacturing performance measurement and evaluation framework. Due to its generic nature, through interviews with three UK companies, it was demonstrated that the proposed framework could also be applied to other societies and industries, either public or private, to solve their manufacturing performance measurement and evaluation problems