CN110008615A - A kind of HIFU sound field detection system based on finite element model method - Google Patents
A kind of HIFU sound field detection system based on finite element model method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
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Abstract
The HIFU sound field detection system based on finite element model method that the present invention relates to a kind of.The present invention simulates practical HIFU energy converter Enclosed Sound Field distribution character harmony converging pattern feature using finite element model method, obtain the relationship between its driving voltage and radiated sound field acoustic pressure, measurement hydrophone is precisely controlled using high-precision industrial machinery arm and sweeps survey work in the quick of three-dimensional space progress spherical surface sound field of high-strength focused sound field, it is inconsistent with influence of the acoustic radiation angular deviation to acoustic field that spherical surface programming movement path compensates for phase, the integrated embedded motion control of the present invention and data acquisition module are connected directly directly and with notebook, maximum simplification measuring system, with high-precision industrial machinery arm, accurate scan space sound field simultaneously feeds back to finite element type and optimizes processing, it can be realized finite element model and accurately simulate HIFU energy converter radiated sound field, it provides one kind for the metrology and measurement of supersonic source and can borrow The mode of mirror.
Description
Technical field
It is the invention mainly relates to a kind of supersonic source sound field detection method, in particular to a kind of based on the high-strength of finite element model
Spend the detection system of focusing acoustic field.
Background technique
Medical Instruments such as bear it is exceeded vibration and noise factor influence, will lead to equipment damage, influence diagnosis and it is subsequent
Medical treatment.The purpose that ultrasonic medical equipment periodically carries out gauge check is exactly to be to check ultrasonic device quality and safety
And determine, guarantee that it being capable of normal use.The metering of medical supersonic source acoustical behavior have become medical measurement one is important
Branch, high-strength focus supersonic therapeutic system mainly utilize ultrasonic wave direct to 65 degree or more in diseased region focusing transient heating
Killing tumor cells." focus ultrasonic knife is helped in sea " of the entirely autonomous intellectual property of China by the non-invasive of HIFU technology, safety,
Validity and feasibility combine together and have come into the clinical practice stage, and China is just stepping up HIFU technology clinically at present
Paractical research.
Effective appraisement system not formed to the dosage of HIFU and sound field form etc. at this stage, in order to realize that safety has
The treatment of effect, it is necessary to which, to HIFU sound-filed simulation, acoustic pressure distribution, acoustical power and focal regions size and form etc. are made accurate and effective
Situation is evaluated, the method that supersonic source is measured in traditional medical measurement still rests on large-scale experiment room test phase.And at present
Detection method such as radiant force sedimentation balance method, the testing principle of the methods of calorimetry and raster method which dictates that it can only obtain it is single
Power index, be not suitable for measuring multiple parameters.Therefore for the device development of the multi-parameter gauge check of HIFU Treatment equipment
It is extremely urgent.
Summary of the invention
For above-mentioned existing problem, the present invention provides a kind of HIFU System sound field detection method, standard set-ups
And focused transducer radiated sound field model.
A kind of HIFU System sound field gauge check method, the detection method are based on finite element model method principle, and feature exists
Following two step is specifically included in this method:
Step 1: the radiated sound field that HIFU Treatment energy converter is carried out under finite element software is emulated, in different excitation situations
Under carry out research Underwater Acoustic Propagation characteristic and converging pattern, obtain its theoretical driving voltage and radiated sound field space sound pressure level it
Between relationship；
Step 2: it is swept with mechanical arm load cambered surface programming movement TRAJECTORY CONTROL measurement hydrophone and surveys HIFU Enclosed Sound Field, detection
The sound parameter of sound field, obtains the relationship between the driving voltage of actual transducer and acoustic pressure, and Real-time Feedback is in finite element model,
Adjust the setting such as excitation parameters, optimized for actual sound field environment, by the driving voltage of finite element model and acoustic pressure it
Between relationship and actual measured results coincide；
Wherein, the step 1 specifically:
According to the specific structure design of HIFU Treatment transducer device, energy converter mould is established in COMSOL finite element emulation software
Type, according to its different operating physical field, on-load pressure acoustic module, piezo electric module, electrostatic module and Solid Mechanics module etc. are no
Multiple physical field Coupling Research is carried out with physical field, different driving voltage parametric excitation energy converter radiated sound fields is loaded, studies its sound
The interpretation of result of field distribution and focus characteristics under the conditions of different excitations is extracted and is studied to the sound parameter of its sound field, presses
According to the different acoustic fields distribution in requirement extract sound field three-dimensional space, carries out acoustical power and calculate and the analysis of focal regions size and form.
Wherein, the step 2 specifically:
According to the specific sound field environment of actual HIFU transducer device and focal position form, high-precision industrial machinery is controlled
Arm is chosen 1 spherical surface planning path in its focal regions and is measured and contract measurement face range simultaneously, passes through embedded movement first
Controller controls manipulator motion, the motion profile of cambered surface planning path is inputted in notebook, so that mechanical arm is in three-dimensional space
Between high-precision motion is carried out in sound field, the fibre optic hydrophone of resistance to high sound intensity, which is swept, surveys spherical surface acoustic pressure data, and spherical surface planning path can
Ensure that the operative end surface of measurement hydrophone can be vertical with the tangent line of spherical wave sound field, it is ensured that data measured is more complete, makes up
The problem of acoustic radiation angle compensation.According to actual sound-filed simulation and focal regions size and form, its finite element model is joined
The optimizations such as number setting change, make it coincide with practical HIFU energy converter radiated sound field.
A kind of HIFU sound field detection system of finite element model, the detection method be based on finite element model principle, including
Manipulator motion module, integrated embedded motion control and data acquisition module.
The manipulator motion module is responsible for carrying out high-precision path planning in high-intensitive sound field indicators measurement hydrophone
Movement.
The embedded motion-control module is responsible for controlling mechanical arm progress planning path movement, the fortune of control system
Dynamic control, realizes moving direction, movement speed, the control of shift position and the feedback apart from displacement of mechanical arm.
The portable data acquisition module, be responsible for acquire sound field data, and in real time save and show original waveform and
Imaging results realize acquisition and the analytic function of acoustical signal.
Furtherly, the manipulator motion module is controlled using Embedded Motion, can be realized three
The spherical surface and cambered surface of dimension space, which are swept, surveys path, realizes spatially lower or so translation, the functions such as rotation.With manual, stopping, certainly
Move three kinds of operating statuses.And it can realize that the high-precision to sound field scans, and reduces and sweeps by changing the rotation angle of manipulator
Retouch influence of the method Path selection to sound field data result.
Furtherly, manipulator motion module guarantees the steady movement of measurement hydrophone.It is adjusted and is driven by motor speed
The distance resolution of very little can be achieved in the selection of dynamic device high-subdividing number, to accurately be planned spatial resolution, avoid by
It is influenced in the excessive bring precision of step-length.
The beneficial effects of the present invention are: realize that the acoustical behavior to HIFU energy converter is ground using finite element model method
Study carefully, has filled up both at home and abroad to the blank of HIFU supersonic source situ metrology detection method, realized the essence to HIFU supersonic source multi-parameter
Quasi- gauge check provides a kind of referential mode for the measurement detection system of ultrasonic medical equipment.
Detailed description of the invention
Fig. 1 is detection system device front view:
Fig. 2 is 5DOF industrial machinery arm schematic diagram；
Fig. 3 is portable oscilloscopel schematic diagram；
Fig. 4 is Embedded Motion schematic diagram；
Fig. 5 is that practical HIFU concave spherical surface treats energy converter modeler model schematic diagram；
In Fig. 1: 1, notebook, 2, portable oscilloscopel, 3, Embedded Motion, 4, cable, 5, controller connecting line, 6,
Mechanical arm, 7, measurement hydrophone, 8, entrant sound water pocket, 9, HIFU Treatment head, 10, HIFU water pocket, 11, testing flume frame, 12, HIFU
Therapeutic bed.
Specific embodiment
The present invention will be further described below with reference to the drawings.
This practical invention is to be analyzed the acoustic field characteristics of energy converter by establishing model based on finite model method, pass through control
Mechanical arm, which is swept, surveys the three-dimensional space of the focal point of high-strength focused sound field to realize the measurement to its sound field.The manipulator of mechanical arm
Upper fixed hydrophone fixture, measurement hydrophone is fixed on fixture, wraps hydrophone with entrant sound water pocket and to carry out anchor ear close
Envelope, in order to the degassed water in entrant sound water pocket not made to leak outside.Control mechanical arm carries entrant sound water pocket and HIFU
Water pocket is coupled, and the material selection and HIFU of entrant sound water pocket carry the consistent in density of water pocket, so that the influence to sound field is dropped
To minimum.
When measurement, the installation site of mechanical arm is set to origin, coordinate is (0,0,0) for setting, inputs in control software
Planned path (), wherein n represents the angle that manipulator turns in three-dimensional space.Mechanical arm a total of five is free
Degree, using circular cylindrical coordinate form.Maximum working radius is 800mm, arm motion parameter specifically: flexible stroke 600mm stretches
Speed 200mm/s, lifting travel 200mm, lifting speed 100mm/s, 0 ° to 360 ° of revolution range.According to HIFU energy converter
Sound field characteristic, using arc surface type scan path, this scan method directly make the operative end surface of measurement hydrophone directly with
The problem of tangent line of HIFU spherical wave sound field is vertical, and data measured is more complete, compensates for acoustic radiation angle compensation.It is empty that survey will be swept
Between spherical sound field path command be loaded onto Embedded Motion, control mechanical arm is transported in the three-dimensional space of sound field
It is dynamic.Wherein the movement velocity of mechanical arm is strict with, entrant sound water pocket caused by leading as excessive velocities is avoided to shake
The problems such as rolling.Notebook controls portable oscilloscopel, the sound field data that real-time display measures on notebook screens, and carries out reality
When show analysis, convenient for analysis sound-filed simulation form.
The structure of entire detection system designs simplification, directly and notebook by motion-control module and data acquisition module
It is connected, communication modes is simplified, can also carry to ultrasonic medical scene and be detected.
Claims (4)
1. a kind of HIFU sound field detection system based on finite element model method, which is based on finite element mould
The integrated embedded acquisition control module of type method combination industrial machinery arm, it is characterised in that the system specifically includes following two step
It is rapid:
Step 1: the modeling of medical HIFU Treatment energy converter and radiated sound field being emulated using under finite element software, in different drivings
Research Underwater Acoustic Propagation characteristic and converging pattern are carried out in the case of voltage drive, record the pass between its driving voltage and sound radiation pressure
System；
Step 2: it is swept with mechanical arm load cambered surface programming movement TRAJECTORY CONTROL measurement hydrophone and surveys HIFU Enclosed Sound Field, detection
Radiation fields parameter information, and the relationship feedback between driving voltage and sound radiation pressure in finite element model and is combined actual
Finite element model is optimized to and coincide with actual measured results by sound field environment；
Wherein, the step 1 specifically:
According to the specific structure design of HIFU Treatment transducer device, energy converter mould is established in COMSOL finite element emulation software
Type, according to its different operating physical field, on-load pressure acoustic module, piezo electric module, electrostatic module and Solid Mechanics module etc. are no
Multiple physical field Coupling Research is carried out with physical field, different driving voltage drive parametric excitation energy converter radiated sound field is loaded, not
With its sound-filed simulation and focus characteristics are studied under the conditions of excitation, the sound parameter of its sound field is extracted and studied, is measured respectively
Radial acoustic pressure distribution, determines driving voltage value and the corresponding radiation loaded on the transducer in the axial direction of sound field and focal plane
The relationship of sound pressure level.
Will wherein, the step 2 specifically:
According to the specific sound field environment of actual HIFU transducer device and focal position form, high-precision industrial machinery is controlled
Arm is chosen 1 spherical surface planning path in its focal regions and is measured and contract measurement face range simultaneously, passes through embedded movement first
Controller controls manipulator motion, the motion profile of cambered surface planning path is inputted in notebook, so that mechanical arm is in three-dimensional space
Between high-precision motion is carried out in sound field, the fibre optic hydrophone of resistance to high sound intensity, which is swept, surveys spherical surface acoustic pressure data, and spherical surface planning path can
Ensure that the operative end surface of measurement hydrophone can be vertical with the tangent line of spherical wave sound field, it is ensured that data measured is more complete, makes up
The problem of acoustic radiation angle compensation.Motion control and data are acquired into the efficient simplification of Communication, can synchronize and take down notes
The real-time acquisition function of sound field data is carried out in sheet and is shown sound field data imaging result and is analyzed.According to actual sound field
Distribution and focal regions size and form carry out the optimization such as parameter setting change to its finite element model, make itself and practical HIFU energy converter
Radiated sound field coincide.It using the practical focused transducer feature consistent with model, tests and determines sound source surface, sound source near field is burnt
The relationship of point sound pressure level and acoustic pressure axis data and driving voltage on acoustic axis at domain, and Real-time Feedback is gone forward side by side with simulation model
Row Modifying model, so that the relationship between sound pressure level and driving voltage in model and experiment is substantially coincide.
2. a kind of HIFU sound field detection system based on finite element model method, which is based on finite element model method
Principle, it is characterised in that: it is able to use finite element model reduction HIFU energy converter radiated sound field and its sound parameter is analyzed,
Obtain the acoustic pressure of its driving voltage and sound field space.Major experimental part includes mechanical movement module, integrated embedded and data
Acquisition module；
The manipulator motion module includes 5DOF industrial machinery arm, is responsible for stretching in ultrasonic sound field three-dimensional space,
Lifting extends, instructions and moving direction, movement speed, the control of shift position and the feedback and ball apart from displacement such as rotation
Face and cambered surface planning path motor function realize high-accuracy multiple-degree-of-freedom movement in sound field space；
The fortune controls control module, is responsible for planning mechanical arm in the motion path of three-dimensional space, and carry out real-time compensation and prison
Control；
Data acquisition module is integrated with software, acquisition parameter can be arranged in real time in notebook by the acquisition module, and
Realize real-time display and storing data function.And analysis sound field data are calculated, Real-time Feedback is in finite element model.
3. according to the method described in claim 1, it is characterized by: can according to finite element model to the sound field of HIFU energy converter into
Row prediction, simulates the spatial sound Field distribution characteristic and focus characteristics of the energy converter, can be distributed to the acoustic pressure of corresponding position, sound
Strong distribution and acoustical power extract calculating, can analyze under the conditions of the excitation of different driving voltage its transducer performance
Evaluation, obtains the relationship between the acoustic pressure and driving voltage of energy converter theory, and can be accurately positioned to its focus parameter.
4. the apparatus of claim 2, it is characterised in that: use oscillograph and movement industry control tank module respectively portable
Oscillograph and embedded movement control card substitute, purpose by the volume of entire measuring system and communication function maximum simplification,
Realize high-precision control manipulator motion, realization detects its sound parameter.Mechanical arm using cambered surface motion planning path into
The scanning of row sound field.Based on finite element model method, the sound-filed simulation that controllable mechanical arm carries out focal point directly into focal coordinates is surveyed
It measures and calculates the sound parameters such as acoustical power in real time.It obtains between practical driving voltage and acoustic pressure and feeds back in finite element model, it is right
Its sound field parameters optimizes so that matching with actual emanations sound field.
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| CN113492406A (en) * | 2021-07-19 | 2021-10-12 | 中国人民解放军92578部队 | Cabin noise sound pressure automatic detection method |
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