Ultrasonic transducer is a piezoelectric actuator that converts AC electrical energy into ultrasonic mechanical vibration to accelerate the material removal rate of workpiece in rotary machining (RUM). In this study, an impedance model established by electromechanical equivalent approach. The not only facilitates structure design transducer, but also predicts effects different structural dimensions on characteristics transducer. Moreover, extension length tool and tightening torque clamping...

Summary Nonaqueous drilling fluids are often chosen to drill troublesome shale formations in an effort minimize wellbore-instability problems. However, experience the Gulf of Mexico (GOM) indicates that when highly faulted areas, oil- and synthetic-based do not always prevent wellbore destabilization. This is evidenced by collapse, resulting difficulty with hole cleaning, tripping, logging, casing running. It known chemical, physical, mechanical effects from interaction between fluid...

Abstract Lost circulation in fractured formations is one of the drilling's biggest expenses terms non-productive time (NPT), unit mud cost and safety issues. The severity persistence losses are to a large extent determined by type formation into which fluid being lost. It imperative identify whether natural or induced fractures as naturally rocks require different treatments than those drilling fractures. One way identifying fracture image logs very local limited conductive muds, so still...

Rotary ultrasonic machining (RUM) is a superior technology to machine hard and brittle materials. Traditionally, the compensation optimization for RUM system limited single resonant frequency. This article presents novel double approach impedance frequency regulations of via multiobjective genetic algorithm (MOGA) aiming achieve resonance monitor process in real time. For this, we first establish model rotary holder (RUH) by adopting T-type circuit that includes comprehensive electromagnetic...

Resonant frequency and impedance matching have great significance for the vibration performance online monitoring of rotary ultrasonic machining. Network compensation is a typical solution to match resonant between holder (RUH) transducer. However, traditional bilateral method could adversely affect dynamic balance RUH. Currently, existing unilateral methods can only realize matching. A novel that satisfies both proposed. First, model RUH vibrating system established according its equivalent...

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Dynamic characteristics and ultrasonic properties of piezoelectric transducer determine the bonding quality in heavy aluminum wire bond packaging. In this paper, an impedance model for transducers is developed by analytical calculations using equivalent circuit method. This lumped indicates relationship between other parameters such as material features, structure dimensions, loadings, driving electrical power, losses. can be used not only design but also to predict frequency at different...

A method to evaluate AMT shift quality based on neural network is implemented in Matlab/Simulink and an objective evaluation software designed specially, which enables the possibility produce ratings. The trained by data swatch attained after selecting metrics. Tests show that it able grades quality. And correlation between developed subjective ratings given drivers proved.

We propose a chaos time-domain reflectometry (CTDR) for locating faults on live wires. This method uses chaotic output of an improved Colpitts oscillator as probe signal, and detects wire by correlating duplicate with the echo signal. Benefiting from anti-jamming correlation function wideband chaos, fault location wires can be achieved. experimentally demonstrate detection in digital communication system, which type signal named high density bipolar order 3 (HDB3) is transmitted. The effects...

We propose a chaotic guided radar for perimeter intrusion detection and experimentally demonstrate the corresponding prototype which includes transmitter, receiver two leaky coaxial cables (LCXs). A wideband Boolean-chaos signal is generated in transmitter served as probe signal. An electromagnetic surveillance area formed between LCXs act transmitting receiving antennas. The can accurately locate an intruder crossing by measuring variation of correlation traces before after intrusion....

Radiotherapy (RT) requires information and images from both diagnostic treatment equipment. Standards for radiotherapy have been ratified with seven DICOM-RT objects their IODs (Information Object Definitions). However, the contents of these require incorporation RT workflow in a logical sequence. The first step is to trace workflow. second now direct all related corresponding into DICOM Server then ultimately an application server. Methods: In our design, was based on PACS data model. model...

Ultrasonic machining is a hybrid process which combination of the additional rotary and ultrasonic vibration energy. It has been successfully applied in hard brittle materials processing. In processing application, energy will be different same driving current under conditions parameters transducer. This paper proposes method to predict using Elman neural network. According transducer, required by obtained network prediction model. A number experimental data have collected used training...

With the rapid development and large investment in highway construction, detection, evaluation, prediction maintenance of pavement performance are getting more attention than ever before today's China. While most current codes standards provide much guidance for detection evaluation performance, a systematic management tool to implement these provisions is rare. To fill this gap, system presented. This consists three parts i.e. subsystem which obtains detailed data condition by various tools...

We propose a novel code-division multiple-access (CDMA) technique for high-speed computer networks using prime codes and optical processing to guarantee real-time data communications. All-optical (LAN) architectures fully tunable CDMA encoders/decoders are presented, the delay-control algorithms given. It is shown that proposed have very fast reconfiguration time can be feasibly implemented by integrated optics.

It was well known that the radiation monitoring is an essential part of dealing with a nuclear accident safely. When Nuclear-powered Vessel (NPV) in event at sea, rescue vessels different functions would rush to scene implement rescue. In order ensure safety emergency personnel aboard vessels, some kinds measuring devices should be installed and ambient levels measured. However, occurrence sea few unforeseeable, so usually perform other ordinary works are dispersed departments. Since that,...