Piezoelectric sensors and actuators are the bridge between electronic mechanical systems in structures. This type of sensor is a key element integrity monitoring aeronautic structures, bridges, pressure vessels, wind turbine blades, gas pipelines. In this paper, an all-in-one system for Structural Health Monitoring (SHM) based on ultrasonic waves presented, called Phased Array Enhanced Life Assessment. integrated instrument able to generate excitation signals that sent through piezoelectric...

Currently, structures are examined during manufacturing by means of Non Destructive Tests (NDT), but there is an increasing interest in monitoring its integrity over whole life cycle using Structural Health Monitoring (SHM) strategies. The aircraft particularly important as they suffer high strain under extreme atmospheric conditions. There extensive literature on SHM for aviation available few references comprehensive methodologies. This article introduces a methodology, device and the...

This paper proposes a new damage index named degree of health (DoH) to efficiently tackle structural monitoring in real-time. As key contribution, the proposed relies on pattern matching methodology that measures time-of-flight mismatch sequential ultrasonic guided-wave measurements using fuzzy logic fundamentals. The signals are generated transmission beamforming technique with phased-array piezoelectric transducers. acquisition is carried out by two phased-arrays compare influence...

Systems for structural health monitoring in aeronautical structures use methods of measuring the elongation that normally require too heavy setups or difficult assembly jobs, such as those based on traditional strain gauges. Alternative fiber Bragg gratings tend to be very expensive. We analyze possibility improving existing designs with aid low-cost plastic optical sensors. For this purpose we test these sensors a rudder flap subjected different types bending forces. The results show they...

Safety and performance of the turbo-engine in an aircraft is directly affected by health its blades. In recent years, several improvements to sensors have taken place monitor blades a non-intrusive way. The parameters that are usually measured distance between blade tip casing, passing time at given point. Simultaneously, techniques been developed allow for inference-from those under certain conditions-of amplitude frequency vibration. These measurements carried out on engines set rig,...

Mobile telephones have wide impact. Although they were initially designed to talk, can be used in many other applications, which require wireless communications among machines. This paper describes a circuit demonstrate this ability. It uses GSM module that takes advantage of Global System for communication. As shown paper, system develop different applications.

The goal of the research presented in this paper is to design and incorporate new technologies into railway bogie-mounted sensors. It often impossible connect mounted systems physical wires due their location an inaccessible position or distance energy source. Therefore, another power source must be used solve problem. Energy harvesting technology increasingly popular solution that extracts from ambient environment transforms it electrical energy. Using piezoelectric transducers, possible...

Photovoltaic (PV) systems power losses are approximately 15–20% of the performance ratio for current PV systems. There several reasons that explain modules failures, and since they connected in series to rest string, a failure one module may result entire string. In addition, some these if not fixed time become permanent reduce lifespan modules. Periodic monitoring is only way detect failures. Monitoring techniques oriented groups unable faults individual I-V curve tracers, which level use...

To maximize photovoltaic systems performance the monitoring of them is essential. There are several faults that produce energy losses in system. When a fault happens system has to detect it and give an indication about which component with fault. For this, most set parameters measured, usually four: current, voltage, temperature irradiance. In some these measures obtained for whole plant whereas others, modules measured one by one. this work, study methods presented.

The development of reliable structural health monitoring techniques is enabling a healthy transition from preventive to condition-based maintenance, hence leading safer and more efficient operation different industries. Ultrasonic guided-wave based beamforming one the most promising techniques, which supports large thin-walled structures. However, has been typically applied post-processing stage (also known as virtual or receiver beamforming) because transmission physical requires complex...

We report a case of traumatic anal incontinence successfully treated by the transplant gracilis muscle sling, using technique described Pickrell et al. in 1952. Although has been used treatment congenital incontinence, its use cases not widely accepted. Instead, many techniques offering uncertain results have employed. believe that Pickrell's is worthwhile procedure presence particularly with noniatrogenic large perineal wounds, and establishment temporary colostomy immediately after injury,...

The goal of this paper is to present both the development an intelligent sensor that can be used obtain information about existence rolling contact fatigue cracks created by wheel–rail interactions and also data obtained in a real-world study performed for its validation. design bogie-mounted instrumentation system detect measure wheel railway units introduced, experimental results are presented. designed analyse compare angular velocity wheels unit. It uses photodiodes acquire conditions...

This paper demonstrates the implementation of indoor Bluetooth communication multi-hop networks. Since performance such networks determines range applications that they can support, wireless is a common topic interest. Communication network models are widely used to estimate in many different aspects. focuses on one aspects, i.e., time data transportation home network, and provides novel empirical model for latency with asynchronous links when active. The offers sharp estimation added every...

Impact detection in aeronautical structures allows predicting their future reliability and performance. An impact can produce microscopic fissures that could evolve into fractures or even the total collapse of structure, so it is important to know location severity each impact. For this purpose, optical fibers with Bragg gratings are used analyze vibrations generated by them. In paper proven be detect impacts, also a high-frequency interrogator necessary collect valuable information about...

The performance of airplane engines is influenced by the their bladed disks. loads those are under, both internal and external, origin vibrations than can jeopardize integrity. Traditionally, monitoring has been circumscribed to prototyping quality tests manufactured However, development nonintrusive sensors techniques evaluate vibration based on opens full engines, even onboard, new possibilities. In order assess with these techniques, several should be employed. distance from blade tip...

A PV plant monitoring system, which is able to detect faults in individual modules presented. The system divided two parts: control unit for the whole and a measuring circuit connected parallel each module. disturb working point of module this perturbation estimate I-V characteristic without disconnecting it from rest system. fault by obtaining real outpout power, expected power failures, maximum point. was designed terms low cost simplicity, operate an automatic remote way.

The measurement of the tip clearance and time arrival every single blade in rotating turbo machinery is starting point to characterize performance a turbine. type sensors employed acquire data for this analysis are mainly non-intrusive such as optic, capacitive, eddy-current microwave sensors. This paper introduces method calculate blades using fibre-optic probe. each evaluated right after detecting its pass, before next finishes passing front sensor. Both parameters available from that...

The process from the conception of a new device-or when need is detected-to putting electronic product on market shown in several places. development stages for an can be diverse: design, manufacturing, test, and many hours engineering. However, are different project or included teaching programs our universities? In this paper, proposals regarding their relationship with curriculum some countries analyzed.

Structural health monitoring comprises a set of techniques to detect defects appearing in structures. One the most viable is based on guided ultrasonic wave test (UGWT), which consists emitting waves throughout structure, acquiring emitted with various sensors, and processing changes structure. The UGWT layered composite structures challenging due anisotropic propagation characteristics such high signal attenuation that experience. Hence, very low amplitude signals are hard distinguish from...