Dr. Benjamin P. Dolgin Profile

Dr. Benjamin P. Dolgin

Chief Scientist at Raytheon UTD

SPIE Involvement:

Author

Publications (12)

Proceedings Article | 15 July 2002 Paper

Novel horn designs for ultrasonic/sonic cleaning, welding, soldering, cutting, and drilling

Stewart Sherrit, Steven Askins, Mike Gradziol, Benjamin Dolgin, Xiaoqi Bao, Zensheu Chang, Yoseph Bar-Cohen

Proceedings Volume 4701, (2002) https://doi.org/10.1117/12.474671

KEYWORDS: Ultrasonics, Acoustics, Titanium, Solids, Transducers, Manufacturing, Finite element methods, Signal attenuation, Resonators, SolidWorks

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A variety of Industrial applications exist where power ultrasonic elements such as the ultrasonic horn are used. These included the Automotive, Instruments, Foods, Medical, Textiles and Material Joining and Fabrication Industries. In many of these devices the ultrasonic horn is the key component. The standard transducer used in these devices consists of three main parts, the backing, the piezoelectric elements and the horn. Standard horn designs have changed very little since their inception. There are four common types of standard horns. They are; constant, linear, exponential and stepped, which refer to the degree to which the area changes from the base to the tip. A magnification in the strain occurs in the horn that in general is a function of the ratio of diameters. In addition the device is generally driven at resonance to further amplify the strain. The resonance amplification is in general determined by the mechanical Q (attenuation) of the horn material and radiation damping. The horn length primarily determines the resonance frequency. For a 22 kHz resonance frequency a stepped horn of titanium has a length of approximately 8 cm. Although these standard horns are found in many current industrial designs they suffer from some key limitations. In many applications it would be useful to reduce the resonance frequency however this would require device lengths of the order of fractions of meters which may be impractical. In addition, manufacturing a horn requires the turning down of the stock material (eg. Titanium) from the larger outer diameter to the horn tip diameter, which is both time consuming and wasteful. In this paper we will present a variety of novel horn designs, which overcome some of the limitations discussed above. One particular design that has been found to overcome these limitations is the folded horn. In this design the horn elements are folded which reduce the overall length of the resonator (physical length) but maintain or increase the acoustic length. In addition initial experiments indicate that the tip displacement can be further adjusted by phasing the bending displacements and the extensional displacements. The experimental results for a variety of these and other novel horn designs will be presented and compared to the results predicted by theory.

Proceedings Article | 15 July 2002 Paper

Analysis and simulation of the ultrasonic/sonic driller/corer (USDC)

Xiaoqi Bao, Zensheu Chang, Stewart Sherrit, Benjamin Dolgin, Yoseph Bar-Cohen, Dharmendra Pal, Shu Du, Thomas Peterson

Proceedings Volume 4701, (2002) https://doi.org/10.1117/12.474673

KEYWORDS: Transducers, Ultrasonics, Finite element methods, Computer simulations, Wave propagation, Chemical elements, Software, Fermium, Instrument modeling, Algorithm development

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Proceedings Article | 15 July 2002 Paper

Modeling of particle flow due to ultrasonic drilling

Zensheu Chang, Benjamin Dolgin, Xiaoqi Bao, Stewart Sherrit, Yoseph Bar-Cohen

Proceedings Volume 4701, (2002) https://doi.org/10.1117/12.474672

KEYWORDS: Particles, Contamination, Finite difference methods, Ultrasonics, Software, Mars, Algorithm development, Complex systems, Computer programming, Chlorine

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Proceedings Article | 16 August 2001 Paper

Ultrasonic/sonic drilling/coring (USDC) for planetary applications

Yoseph Bar-Cohen, Stewart Sherrit, Benjamin Dolgin, Xiaoqi Bao, Zensheu Chang, Dharmendra Pal, Ron Krahe, Jason Kroh, Shu Du, Thomas Peterson

Proceedings Volume 4327, (2001) https://doi.org/10.1117/12.436556

KEYWORDS: Acoustics, Mars, Ultrasonics, Data modeling, Finite element methods, Statistical analysis, Venus, Motion models, Ceramics, Temperature metrology

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Proceedings Article | 24 July 2001 Paper

Residue detection for real-time removal of paint from metallic surfaces

Yoseph Bar-Cohen, Xiaoqi Bao, Benjamin Dolgin, Neville Marzwell

Proceedings Volume 4335, (2001) https://doi.org/10.1117/12.434165

KEYWORDS: Sensors, Magnetism, Ultrasonics, Magnetic sensors, Robotics, Bridges, Feedback control, Transducers, Metals, Ferromagnetics

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Proceedings Article | 16 July 2001 Paper

Virtual reality robotic telesurgery simulations using MEMICA haptic system

Yoseph Bar-Cohen, Constantinos Mavroidis, Mourad Bouzit, Benjamin Dolgin, Deborah Harm, George Kopchok, Rodney White

Proceedings Volume 4329, (2001) https://doi.org/10.1117/12.432667

KEYWORDS: Haptic technology, Actuators, Virtual reality, Robots, Robotics, Sensors, Telesurgery, Visualization, Electromagnetism, Space robots

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Proceedings Article | 14 June 2000 Paper

Ultrasonic/sonic drilling/coring (USDC) for in-situ planetary applications

Yoseph Bar-Cohen, Stewart Sherrit, Benjamin Dolgin, Dharmendra Pal, Thomas Peterson, Jason Kroh, Ron Krahe

Proceedings Volume 3992, (2000) https://doi.org/10.1117/12.388189

KEYWORDS: Acoustics, Ultrasonics, Radon, Data modeling, Actuators, Robotics, Sensors, Performance modeling, Head, Solids

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Proceedings Article | 8 November 1999 Paper

Electrorheological-fluid-based force feedback device

Charles Pfeiffer, Constantinos Mavroidis, Yoseph Bar-Cohen, Benjamin Dolgin

Proceedings Volume 3840, (1999) https://doi.org/10.1117/12.369269

KEYWORDS: Haptic technology, Robotics, Sensors, Space robots, Actuators, Laser induced damage, Mirrors, Interfaces, Electroactive polymers, Control systems

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Proceedings Article | 10 September 1993 Paper

Dimensionally stable materials for space interferometers

Benjamin Dolgin

Proceedings Volume 1947, (1993) https://doi.org/10.1117/12.155744

KEYWORDS: Interferometers, Mirrors, Composites, Control systems, Reflectors, Optical components, Space telescopes, Sensors, Interferometry, Glasses

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Proceedings Article | 16 September 1992 Paper

Thermally induced changes in the focal distance of composite mirrors: composites with a zero coefficient of thermal expansion of the radius of curvature

Benjamin Dolgin

Proceedings Volume 1690, (1992) https://doi.org/10.1117/12.137999

KEYWORDS: Mirrors, Composites, Optical components, Optical spheres, Optical instrument design, Reflectors, Temperature metrology, Differential equations, Manufacturing, Calcium

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