Showing papers in "Mechanical Systems and Signal Processing in 1988"

TL;DR: In this paper, the authors introduced the concept of the complex mode indicator function (CMIF) and its application in spatial domain parameter estimation, which was developed by performing singular value decomposition (SVD) of the frequency response function (FRF) matrix at each spectral line.

TL;DR: The fusion of information from multiple sensors achieves effective prediction and control performance with relatively simple signal processing in an application using acoustic, current and force sensors on a numerically-controlled milling machine.

TL;DR: In this article, a method of using the matrix Auto-Regressive Moving Average (ARMA) model in the Laplace domain for multiple-reference global parameter identification is presented, particularly applicable to the area of modal analysis where high modal density exists.

TL;DR: In this article, a generalised method for the identification of a large range of nonlinear systems subjected to random excitation is proposed, which is restricted to single input/output systems and is based on existing techniques for multiple inputs and outputs.

TL;DR: In this article, the amplitude and phase of the changes in the vibration due to a fatigue crack in a tooth was determined by an existing digital signal processing technique for calculating the amplitude of the tooth meshing vibration from the time domain average of the vibration.

TL;DR: An outline of the methods and techniques created and applied in the vibroacoustical (VA) diagnostic area is presented and the author gives his views on future trends.

TL;DR: In this article, the authors presented methods of analysing data from nonlinear systems and estimating non-linear models from noisy input-output measurements using a NARMAX model relating rack position to engine torque.

TL;DR: In this paper, an analytical modeling and signature analysis procedure is presented for the simulation of the non-linear dynamical characteristics associated with rotorblade-seal-casing rub interactions in high performance rotating equipment.

TL;DR: In this article, a complex modal control scheme was proposed to reduce the order of the system to be dealt with and minimise the required control energy and the transient magnitudes of the state.

TL;DR: In this article, the influence of modal control using full state-variable feedback is first demonstrated, and then an estimation algorithm is applied to reconstruct the state vector from the minimum number of measurements.

TL;DR: In this paper, the authors present an efficient method of smoothing steady state, dissipative hyperbolic systems with one spatial dimension using point sensors placed on the system, and demonstrate the algorithm's performance by studying the smoothing problem for sound waves in an air-filled pipe.

TL;DR: In this article, a filter is formulated in the continuous frequency domain using an Instrumental Variable (IV) technique to estimate mass, stiffness and damping parameters from measured vibration data.

TL;DR: In this article, a pattern recognition strategy for online chatter detection was proposed and developed by analysing the acceleration signals from a milling operation, where the components of the feature vectors were defined in terms of total power and dispersion of the dominant forced and chatter vibration modes extracted from linear stochastic models characterising the vibrations.

TL;DR: In this paper, an approach to recovering transient shaft speed using a Fourier analyser is presented. But the Fourier analysis is not suitable for the measurement of high frequency shaft vibrations.

TL;DR: In this article, a model of the force response to feedrate changes in slot milling, based on previously reported experimental studies, is presented, and simulation studies are performed, using a flat band width multi-frequency test signal to persistently excite the system.

TL;DR: In this article, the relations between the right and left eigenvectors of a non-symmetric matrices are established for axisymmetric rotors with non-synmmetric coupling.

TL;DR: In this paper, the operation of the impedance method of non-destructive inspection on honeycomb structures with carbon fibre reinforced plastic (CFRP) skins has been investigated, and it has been shown that this transducer is an attractive alternative to the vibrating rod transducers used in commercially available testing instruments, since an absolute value of impedance can readily be obtained, whereas the output of the VR transducers is a highly nonlinear function of impedance so only comparative measurements are produced.

TL;DR: In this paper, two algorithms for subspace inverse iteration are presented, and their convergence properties and applicability in solving TLS problems are analyzed based on the convergence rate and the operation counts in each iteration step.

TL;DR: In this article, a method for extracting the loss factors of each mode of vibration of a structure from an analysis of the structural response to an impulse is described, which does not require the transient to have died away within the time over which the response is measured.

TL;DR: In this paper, a microcomputer based on-line bearing condition monitoring system was developed, which employed synchronised segmentation and parametric spectral comparisons to identify defect sensitive resonances for an investigated bearing system at an early stage of damage.

TL;DR: In this article, a mathematical model relating feedrate to feed force is formulated in a turning process with the compliance of the machine tool taken into consideration, and the model is used for the control of the feed force by a fixed gain and an adaptive PI control algorithm.

TL;DR: The application of a finite difference equation based method for vibration modal parameter estimation for efficient and rapid estimation of structural modal parameters shows that the modal damping ratio is the most difficult to estimate.

TL;DR: In this paper, a time domain method for calculating the absolute modal shapes, natural frequencies and damping ratios of a discrete dynamic system is presented, where the digital records of the impulsive forcing and response of the system used in the method are obtained from sampling both signals at different sampling rates.

TL;DR: Three possible schemes for reducing the variability of spectral estimates obtained from randomly sampled signals are compared and one is shown to be both computationally efficient and superior to the other two in terms of variance reduction.

TL;DR: The design of a program that uses knowledge based techniques along with algorithms is presented by analysing a recorded response measurement and the details of a model are filled out.

TL;DR: In this article, the authors used the bispectral model to determine the damping ratio and natural frequency of offshore structures excited by both unexpected Gaussian forces and known non-Gaussian driving forces.