# US 8,626,458 B2 · Method and system for measuring the dynamic response of a structure during a machining process

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,626,458 B2
- Document ID: US8626458B2
- Status: Granted
- Kind: B2
- Application number: 12/940,827
- Filed: 2010-11-05
- Published: 2011-05-05
- Granted: 2014-01-07
- Earliest claimed: 2009-11-05
- Assignees: Vibration Technologies, LLC
- Applicants: Michael Cone
- Inventors: Michael Cone
- Web page: https://patentgrep.com/patent/US8626458B2

## CPC

- G05B 19/401: characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes (G05B19/19 takes precedence)
- B24B 49/00: Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation (B24B33/06, B24B37/005 take precedence; if applicable to other machine tools, B23Q15/00 - B23Q17/00 take precedence)
- B24B 49/16: taking regard of the load
- G01H 1/00: Measuring {characteristics of} vibrations in solids by using direct conduction to the detector (G01H9/00, G01H11/00 take precedence)
- G05B 2219/37355: Cutting, milling, machining force
- G05B 2219/37432: Detected by accelerometer, piezo electric
- G05B 2219/37433: Detected by acoustic emission, microphone
- G05B 2219/37573: In-cycle, insitu, during machining workpiece is measured continuously
- G05B 2219/37612: Transfer function, kinematic identification, parameter estimation, response
- G05B 2219/50074: Purpose, workpiece measurement to control, adapt feed of tool
- Y02P 90/02: Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- G01H: MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A machine implement includes sensors that measure a force imparted by the machine implement to a structure during a machining process. A sensor array coupled to the structure measures the vibrational response of the structure to the imparted force. Analysis software compares the imparted force to the vibrational response to generate a transfer function for the structure. Based on the transfer function, a tool-path of the machine implement may be adjusted such that the resulting structure has precise vibrational characteristics that substantially comply with a set of design goals for the structure.

## Claims

### Claim 1

A method for measuring the dynamic response of a material during a machining process, the method comprising:
receiving an excitation signal that corresponds to a force of impact of a machine tool with the material during a machining operation and is generated by one or more sensors disposed within the machine tool and configured to measure the force of impact;
receiving a response signal that corresponds to the dynamic response of the material to the force;
determining a vibrational characteristic of the material by comparing the response signal to the excitation signal; and
adjusting the parameters of the machining operation to modify the material based on the vibrational characteristic.

### Claim 2 (depends on 1)

The method of claim 1, wherein the step of determining comprises performing a modal analysis of the excitation signal and the response signal to determine the resonant frequencies of the material.

### Claim 3 (depends on 1)

The method of claim 1, wherein the step of adjusting comprises adjusting the tool-path of the machine tool during the machining operation.

### Claim 4 (depends on 1)

The method of claim 1, wherein the machining operation is a cutting operation.

### Claim 5 (depends on 1)

The method of claim 1, wherein the machining operation is a sanding operation.

### Claim 6 (depends on 1)

The method of claim 1, wherein the one or more sensors comprise a force gauge made of a piezoelectric material.

### Claim 7 (depends on 1)

The method of claim 1, wherein the response signal is generated by an accelerometer attached to the material in proximity to the machining operation.

### Claim 8

A non-transitory computer readable medium storing instructions for causing a processor to measure the dynamic response of a material during a machining process by performing the steps of:
receiving an excitation signal that corresponds to a force of impact of a machine tool with the material during a machining operation and is generated by one or more sensors disposed within the machine tool and configured to measure the force of impact;
receiving a response signal that corresponds to the dynamic response of the material to the force;
determining a vibrational characteristic of the material by comparing the response signal to the excitation signal; and
adjusting the parameters of the machining operation to modify the material based on the vibrational characteristic.

### Claim 9 (depends on 8)

The non-transitory computer readable medium of claim 8, wherein the step of determining comprises performing a modal analysis of the excitation signal and the response signal to determine the resonant frequencies of the material.

### Claim 10 (depends on 8)

The non-transitory computer readable medium of claim 8, wherein the step of adjusting comprises adjusting the tool-path of the machine tool during the machining operation.

### Claim 11 (depends on 8)

The non-transitory computer readable medium of claim 8, wherein the machining operation is a cutting operation.

### Claim 12 (depends on 8)

The non-transitory computer readable medium of claim 8, wherein the machining operation is a sanding operation.

### Claim 13 (depends on 8)

The non-transitory computer readable medium of claim 8, wherein the one or more sensors comprise a force gauge made of a piezoelectric material.

### Claim 14 (depends on 8)

The non-transitory computer readable medium of claim 8, wherein the response signal is generated by an accelerometer attached to the material in proximity to the machining operation.

### Claim 15

A system for measuring the dynamic response of a material during a machining process, the system comprising:
a machine tool comprising at least one sensor disposed within the machine tool and configured to measure a force of impact of the machine tool with the material during a machining operation and generate an excitation signal that corresponds to the force of impact;
a sensor array comprising one or more sensors attached to the material and configured to measure the dynamic response of the material to the force of impact and generate a response signal that corresponds to the dynamic response of the material to the force of impact; and
a signal processing system configured to:
receive the excitation signal,
receive the response signal,
determine a vibrational characteristic of the material by comparing the excitation signal to the response signal, and
adjust the parameters of the machining operation to modify the material based on the vibrational characteristic.

### Claim 16 (depends on 15)

The system of claim 15, wherein the step of determining comprises performing a modal analysis of the excitation signal and the response signal to determine the resonant frequencies of the material.

### Claim 17 (depends on 15)

The system of claim 15, wherein the step of adjusting comprises adjusting the tool-path of the machine tool during the machining operation.

### Claim 18 (depends on 15)

The system of claim 15, wherein the machining operation is a cutting operation.

### Claim 19 (depends on 15)

The system of claim 15, wherein the machining operation is a sanding operation.

### Claim 20 (depends on 15)

The system of claim 15, wherein the sensor array comprises an accelerometer attached to the material in proximity to the machining operation.