Systems and methods for disruption of biofilm and algal growth

Patent metadata

Field	Value
Publication number	US-11833554-B2
Application number	US-202217980185-A
Country	US
Kind code	B2
Filing date	Nov 3, 2022
Priority date	Mar 22, 2017
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

Systems and methods for the ultrasonic disruption of biofilm and algae growth on underwater structures utilize an ultrasonic actuator that produces a natural frequency in the ultrasonic range. In some embodiments, the ultrasonic actuator includes one or more piezoelectric transducers.

First claim

What is claimed is:

1. A method for disruption of biofilm and algae growth on a surface of a structure, comprising:
installing one or more ultrasonic actuators on the surface of the structure, wherein the one or more ultrasonic actuators comprise:
one or more piezoelectric transducers, wherein the one or more piezoelectric transducers have a front side and a back side and wherein the one or more piezoelectric transducers are adapted to produce an ultrasonic frequency, wherein the ultrasonic frequency is a natural frequency of the structure, and wherein the natural frequency of the structure is dependent upon structural stiffness and mass,
a front mass located on the front side of the one or more piezoelectric transducers,
a back mass located on the back side of the one or more piezoelectric transducers,
a preloader, wherein the preloader connects and applies compression to the front mass, the one or more piezoelectric transducers, and the back mass, and
an enclosure encapsulating the one or more piezoelectric transducers, the front mass, the back mass, and the preloader to produce a waterproof enclosure for the one or more ultrasonic actuators;

producing an ultrasonic frequency using the one or more ultrasonic actuators;
generating vibrations on the surface of the structure, wherein the vibrations are caused by the ultrasonic frequency produced by the one or more piezoelectric transducers; and
disrupting biofilm and algae growth on the surface of the structure.

2. The method of claim 1 , wherein the one or more piezoelectric transducers have a circular shape and comprise transducer receiving portals, wherein the front mass is circular in shape and comprises a front receiving portal, wherein the back mass is circular in shape and comprises a back receiving portal, wherein the preloader has a cylindrical shape, and wherein the preloader passes through the front receiving portal, the transducer receiving portals, and the back receiving portal.

3. The method of claim 1 , wherein more than one ultrasonic actuator is installed on the surface.

4. The method of claim 1 , wherein the structure is an underwater structure.

Assignees

• Univ Houston System

Inventors

• Song Gangbing
• Ho Siu Chun Michael
• Patil Devendra

Classifications

• B08B3/12 Primary

  by sonic or ultrasonic vibrations · CPC title

• B06B1/0618

  of piezo- and non-piezoelectric elements, e.g. 'Tonpilz' · CPC title

• B08B17/02

  Preventing deposition of fouling or of dust · CPC title

• B63B59/04

  Preventing hull fouling (anti-fouling paints C09D5/16) · CPC title

• E02B17/0026

  against corrosion · CPC title