Weiji William Wang

• University of Sussex

Quadruped robots have increasingly been used in complex terrains where barriers and gaps exist. In this paper, a four-legged robot with intelligent controllers is designed and simulated. The designed architecture comprises 12 servo motors, three per leg, to provide considerable flexibility in movement and turning. Proportional Integral Derivative (...

Over the past decades, contactless power transfer (CPT) has been acquiring considerable attentions for investigations on wireless power transmitting (WPT) based electric vehicles (EV) charging solutions. This paper describes a geometrically improved CPT system using innovative H-shape ferrite core prototype and electromagnetically analytical method...

In this paper, a contactless power transfer (CPT) system using a novel geometrically enhanced energy transfer coupler with three different shielding materials has been built and analysed, along with the evaluations from aspects of electromagnetics and RMS power transmitting based on electromagnetic resonant coupling. A CPT system design improvement...

This paper describes a novel contactless power transfer (CPT) system with geometrically improved H-shape ferromagnetic cores and electromagnetically prospective modelling analysis methods for wireless power transmitting (WPT) applications of electric vehicles (EVs). A CPT prototype, using optimized H-shaped magnetic couplers and series-to-series (S...

This paper addresses what happens during the acceleration period of undercarriage wheels after aircraft touchdown on the runway. In this acceleration period, a sliding between the wheel tyre and runway surface takes place. The sliding friction causes high temperature which emits pollution smoke and produces excessive tyre wear. A model based on mec...

The fossil fuel scarcity worldwide has rapidly driven the electric vehicles and battery charging technologies, including contactless power transfer (CPT), over the past decades. There still exist many technical difficulties to be specifically addressed and ideas to be innovatively achieved although a lot of contribution on EVs charging solutions ha...

Microwave imaging techniques are extensively researched already in the medical field but not so widely in the security field. The art of this research was how to convert from medical imaging to security imaging according to the requirement of security. The algorithm used for this technology has advanced for better results and quality imaging resolu...

Imaging technologies have been an essential part of security screening especially in aviation security. Aviation security uses different kinds of scanning systems including X-rays, millimeter waves. New development has been researched in both imaging technologies in the past years all over the world. Recently microwave imaging systems for security...

The evolutionary periodogram (EP) is applied to signals collected from an on-line turbine flowmeter for condition monitoring. Firstly, the signal acquired for a normal (fault-free) flowmeter is synchronously averaged to reduce any possible transients or background noise, and then the data is treated to remove irrelevant components and enhance impor...

Due to the advantages offered by the S-transform (ST) distribution, it has been recently successfully implemented for various applications such as seismic and image processing. The desirable properties of the ST include a globally referenced phase as the case with the short time Fourier transform (STFT) while offering a higher spectral resolution a...

An optimal control technique is proposed to address the problem of path tracking of an autonomous ground vehicle. This technique utilizes a Fractional Order Proportional Integral Derivative (FOPID) controller to control a non-holonomic autonomous ground vehicle to track the behaviour of the predefined reference path. Two FOPID controllers are desig...

This article proposes an adaptive neuro-fuzzy inference system (ANFIS) for solving navigation problems of an autonomous ground vehicle (AGV). The system consists of four ANFIS controllers; two of which are used for regulating both the left and right angular velocities of the AGV in order to reach the target position; and other two ANFIS controllers...

The survival of prostate cancer (PrCa) patients is associated with the transition to hormone-independent tumor growth and metastasis. Clinically, the dysregulation of androgen action has been associated with the formation of PrCa and the outcome of androgen deprivation therapy in PrCa. CCAAT/enhancer binding protein delta (CEBPD) is a transcription...

In this paper, the Inverse Discrete Gabor Transform (IDGT) is proposed for signal recovery buried in board-band nonstationary noise. Time-frequency masking filtering technique is implemented to reject the noise from corrupted speech while at the same time maintaining the desired waveform. A synthetic multicomponent non-stationary test signal made u...

Turbocharger (TC) rotor-floating ring bearing (FRB) system is characterised by high speed as well as high non-linearity. Using the run-up and run-down simulation method, this paper systematically investigates the influence of unbalance on the rotordynamic characteristics of a real TC-FRB system over the speed range from 0 Hz to 3500 Hz. The rotor i...

The main objectives of designing the controller for vehicle suspension systems are to reduce the discomfort sensed by passengers that arises from road roughness and to increase the road handling associated with the pitching and rolling movements. This necessitates a very fast and accurate controller to meet as many control objectives as possible. T...

As a high speed rotating device, the modern turbocharger rotor is commonly supported by floating ring bearings (FRBs). The high nonlinearity there can always lead to quite complex and interesting phenomena rarely observed in other rotating applications. Using the run-up and run-down simulation method, this paper originally and systematically discus...

Microwave imaging technologies are widely researched in the biomedical field where they rely on the imaging of dielectric properties of tissues. Healthy and malignant tissues have different dielectric properties in the microwave frequency region, therefore, the dielectric properties of human body's tissues are generally different from other contrab...

A multi-pulse injection strategy for premixed charge compression ignition (PCCI) combustion was investigated in a four-valve, direct-injection diesel engine by a computational fluid dynamics (CFD) simulation using KIVA-3V code coupled with detailed chemistry. The effects of fuel splitting proportion, injection timing, spray angles, and injection ve...

The rotor dynamic behaviour of turbochargers (TC) has been paid significant attention because of its importance in their healthy operation. Commonly, the TC is firmly mounted on engines and they will definitely suffer from the vibrations originated from engines in operation. However, only a limited number of papers have been published with consider...

The main objective of designed the controller for a vehicle suspension system is to reduce the discomfort sensed by passengers which arises from road roughness and to increase the ride handling associated with the pitching and rolling movements. This necessitates a very fast and accurate controller to meet as much control objectives, as possible. T...

The main objective of designed the controller for a vehicle suspension system is to reduce the discomfort sensed by passengers which arises from road roughness and to increase the ride handling associated with the pitching and rolling movements. This necessitates a very fast and accurate controller to meet as much control objectives, as possible. T...

The main objective of designed the controller for a vehicle suspension system is to reduce the discomfort sensed by passengers which arises from road roughness and to increase the ride handling associated with the pitching and rolling movements. This necessitates a very fast and accurate controller to meet as much control objectives, as possible. T...

A Field Programmable Gate Array (FPGA) is proposed to build an Adaptive Neuro Fuzzy Inference System(ANFIS) for controlling a full vehicle nonlinear active suspension system. A Very High speed integratedcircuit Hardware Description Language (VHDL) has been used to implement the proposed controller. Anoptimal Fraction Order PIlDμ (FOPID) controller...

The evolutionary periodogram has been introduced to mechanical fault diagnosis and relationship between the evolutionary periodogram and time-frequency spectrogram has been investigated. The evolutionary periodogram is unveiled as an especially windowed spectrogram, and is applied to gearbox fault diagnosis. It has been shown that the window used i...

The heart sounds with systolic murmurs can be characterized and visualized as a result of free and forced vibrations in human hearts. A joint time frequency distribution with oscillating windows is proposed to extract the signals from heart sounds. Two types of mother wavelets are designed as matching templates based on the nature of murmurs. The t...

The wavelet transform is used to represent all possible types of transients in vibration signals generated by faults in a gearbox. It is shown that the transform provides a powerful tool for condition monitoring and fault diagnosis. The vibration signal from a helicopter gearbox is used to demonstrate the application of the suggested wavelet by a s...

Vibration-based diagnosis has been employed as a powerful tool in maintaining the operating efficiency and safety for large rotating machinery. However, due to some inherent shortages, it is not accurate enough to extract the features of malfunctions by using traditional vibration signal processing techniques. In this paper, a high-resolution spect...

In order to overcome the shortcomings in the traditional envelope analysis in which manually specifying a resonant frequency band is required, a new approach based on the fusion of the wavelet transform and envelope spectrum is proposed for detecting and localizing defects in rolling element bearings. This approach is capable of completely extracti...

A multi-layer perceptron pattern classifier is defined for wavelet map interpretation and its application is described as a tool for mechanical fault detection. As a key step, an instantaneous scale distribution is introduced for quantifying pattern features. Instead of directly inspecting complicated wavelet patterns in time–scale domains with lim...

A method of detecting transients in mechanical systems by matching wavelets with associated signal is proposed, leading to a development of joint time–frequency–scale distribution. The three variables, the time, frequency and scale, have maximised the chance for finding similar signal segments from a system under inspection. The sensitivity is show...

A new cepstral analysis procedure with the complex cepstrum for recovering excitations causing multiple transient signal components from vibration signals, especially from rotor vibration signals, has been developed. Along with the problem of singularity, a major problem of the cepstrum is that it cannot provide a correct distribution of the excita...

Use of the orthogonal wavelet transform to detect abnormal transients generated by early gear damage from the gearbox casing vibration signal is discussed. Orthogonal wavelets, such as Daubechies 4 and harmonic wavelets, are used to transform the time domain synchronous vibration signal into the time-scale domain. The orthogonal wavelet transform u...

The decomposition of gear motion and the related dynamic measurements for the condition monitoring and fault diagnosis of gearboxes are described. The motion error signal is separated according to fundamental frequencies into the harmonic error and the residual error, which are used to quantify the gear condition. High-order accelerations, such as...

The application of the spectrogram to the calculation of the time-frequency distribution of a gear vibration signal is examined. The spectrogram represents the energy distribution of the signal over the frequency domain at every instant of time. The selection of the window function is discussed, and it is shown that the Gaussian function is well su...

A system is described which uses image processing techniques to assist in the automatic interpretation of gear vibration signatures for early failure detection and fault diagnosis. The vibration signature of an individual gear in a gearbox is extracted by the time domain synchronous averaging technique from the total vibration signal measured on th...

The wavelet transform is applied to the analysis of gear vibration signals in order to detect early signs of incipient mechanical failure, making it possible to represent the different scale of features in the vibration signal in a single three-dimensional display, so as to detect different types of faults simultaneously.

The vibration excitation of gears due to motion errors is analyzed via the response of the gearbox outer case. The motion error is classified according to its frequency content. A linear system model of the gearbox structure is used to represent the relationship between the excitation and response. The condition of a gear can be generally indicated...

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The Present Power Spectral Density (PPSD), also referred to as the local power spectral density, is defined and its application to the calculation of the time frequency distribution of a nonstationary signal is examined. The PPSD distribution represents the energy distribution of the signal over the frequency domain at every instant of time. It can...

A system which uses image processing techniques to assist in the automatic interpretation of gear vibration signatures for early failure detection and fault diagnosis is described. The time signature of an individual gear in a gearbox is extracted by the time domain synchronous averaging technique from the total vibration signal measured in the gea...