Instantaneous De-Icing of Freezer Ice via Ultrasonic Actuation

Palacios, José; Smith, Edward C.; Rose, Joseph L.; Royer, Roger

doi:10.2514/1.j050143

Cited by 79 publications

(40 citation statements)

References 15 publications

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“…They have dominant displacements in different directions, which could be used in different applications. For instance, Palacios et al used ultrasonic actuators to instantaneously delaminate the ice layer from a steel substrate [47]. This required the shear stress between the two layers to exceed a certain value, and this was achieved at resonance frequencies where the ultrasonic actuators provided maximum current outputs for a given driving voltage.…”

Section: Discussionmentioning

confidence: 99%

A Numerical Study on the Excitation of Guided Waves in Rectangular Plates Using Multiple Point Sources

Duan

Niu

Gan

et al. 2017

Metals

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Ultrasonic guided waves are widely used to inspect and monitor the structural integrity of plates and plate-like structures, such as ship hulls and large storage-tank floors. Recently, ultrasonic guided waves have also been used to remove ice and fouling from ship hulls, wind-turbine blades and aeroplane wings. In these applications, the strength of the sound source must be high for scanning a large area, or to break the bond between ice, fouling and plate substrate. More than one transducer may be used to achieve maximum sound power output. However, multiple sources can interact with each other, and form a sound field in the structure with local constructive and destructive regions. Destructive regions are weak regions and shall be avoided. When multiple transducers are used it is important that they are arranged in a particular way so that the desired wave modes can be excited to cover the whole structure. The objective of this paper is to provide a theoretical basis for generating particular wave mode patterns in finite-width rectangular plates whose length is assumed to be infinitely long with respect to its width and thickness. The wave modes have displacements in both width and thickness directions, and are thus different from the classical Lamb-type wave modes. A two-dimensional semi-analytical finite element (SAFE) method was used to study dispersion characteristics and mode shapes in the plate up to ultrasonic frequencies. The modal analysis provided information on the generation of modes suitable for a particular application. The number of point sources and direction of loading for the excitation of a few representative modes was investigated. Based on the SAFE analysis, a standard finite element modelling package, Abaqus, was used to excite the designed modes in a three-dimensional plate. The generated wave patterns in Abaqus were then compared with mode shapes predicted in the SAFE model. Good agreement was observed between the intended modes calculated in SAFE and the actual, excited modes in Abaqus.

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Section: Discussionmentioning

confidence: 99%

A Numerical Study on the Excitation of Guided Waves in Rectangular Plates Using Multiple Point Sources

Duan

Niu

Gan

et al. 2017

Metals

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“…Rose et al and others studied ultrasonic deicing at the university and created several ultrasonic de‐icing devices . Palacios et al an ultrasonic de‐icing system was developed which is intended for use in helicopter rotor blade de‐icing. Habibi et al combined ultrasonic and low frequency vibration to provide us with a new method of deicing.…”

Section: Anti‐ice System and De‐icing Systemmentioning

confidence: 99%

A review on ice detection technology and ice elimination technology for wind turbine

et al. 2019

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Blade icing can affect wind turbines to generate electricity. In severe cases, 30% of power generation is lost in a year, and safety problems in the vicinity of wind power plants are also caused. Researchers have designed anti-icing and de-icing technologies to reduce these effects, and excellent ice-detecting devices are a prerequisite for using anti-icing and de-icing technologies. Ultrasonic attenuation technology can effectively and reliably detect the presence of ice without affecting the aerodynamic performance of the blade, providing a reliable guarantee for anti-icing and de-icing systems. Deicing and anti-icing systems are divided into active and passive, active heating blades are still the most effective anti-icing and de-icing methods, but their energy consumption is too high. Although there are many existing de-icing methods, there are not many practical uses. This article introduces them separately and lists their advantages and disadvantages. The use of ultrasonic anti-icing and de-icing is an economical and reliable means that has been proven to be used for anti-icing and de-icing of blades. However, under normal circumstances, a single anti-icing de-icing system cannot completely solve the problem of icing of the blades. This paper suggests using both ultrasonic and hydrophobic coatings to cope with more icing conditions. K E Y W O R D Santi-icing and deicing technology, fan blade, hydrophobic coating, ice detection technology, ultrasonic deicing | INTRODUCTIONWith the rapid development of the world economy, lots of countries are increasingly demanding energy resources. Owing to release a lot of greenhouse gases, chemicals and toxins substances from the combustion of the fossil fuels such as coal and oil, 1 People began to look for renewable energy to provide energy consumption, such as wind energy, 2-4 hydrogen energy, 5-7 solar energy, 8-10 biogas and biomass energy. 11-15 With the wind power growing rapidly, generate electricity by using wind turbines is economical and environmentally friendly. 16 As can be seen in Figure 1, China's total installed capacity of wind turbines in 2016 is much higher than in other countries.China has the largest wind power market in the country, and the installed capacity of wind power is growing steadily year by year. The high density of air is conducive to the development of wind energy resources in cold regions. Figure 2 shows wind resource changes in different seasons. The wind speed from June to August is significantly lower than other months. There are also data showing that wind resources in cold regions are 10% higher than other regions. 17,18

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“…[4][5][6][7][8][9] Instantaneous delamination was observed for both freezer and impact ice, proving the feasibility of the method. Palacios' extensive experimental work raised some indications about actuator design and various conditions associated with ice shedding that can facilitate or impede the effect.…”

Section: State Of the Artmentioning

confidence: 99%

Removing surface accretions with piezo-excited high-frequency structural waves

2015

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Unwanted accretions on structures are a common machinery maintenance problem, which can pose a serious safety threat if not treated effectively and punctually. In this paper we investigate the capability of piezoexcited structural waves for invoking delamination of accreted material from waveguides. We apply a wavebased technique for modelling piezoelectric excitation based on semi-analytical finite elements to model the interface shear stress associated with piezo-actuated structural waves. As a proof of concept, we present a demonstration experiment in which patches of material are removed from a beam-like waveguide with emulated anechoic terminations using ultrasonic excitation.

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Instantaneous De-Icing of Freezer Ice via Ultrasonic Actuation

Cited by 79 publications

References 15 publications

A Numerical Study on the Excitation of Guided Waves in Rectangular Plates Using Multiple Point Sources

A Numerical Study on the Excitation of Guided Waves in Rectangular Plates Using Multiple Point Sources

A review on ice detection technology and ice elimination technology for wind turbine

Removing surface accretions with piezo-excited high-frequency structural waves

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