CN106090524B - A kind of tandem hydraulic pressure fluctuation attenuator and damped system - Google Patents
A kind of tandem hydraulic pressure fluctuation attenuator and damped system Download PDFInfo
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- CN106090524B CN106090524B CN201610393849.9A CN201610393849A CN106090524B CN 106090524 B CN106090524 B CN 106090524B CN 201610393849 A CN201610393849 A CN 201610393849A CN 106090524 B CN106090524 B CN 106090524B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
- F16L55/05—Buffers therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/008—Reduction of noise or vibration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B5/00—Transducers converting variations of physical quantities, e.g. expressed by variations in positions of members, into fluid-pressure variations or vice versa; Varying fluid pressure as a function of variations of a plurality of fluid pressures or variations of other quantities
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- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Damping Devices (AREA)
- Reciprocating Pumps (AREA)
Abstract
A kind of tandem hydraulic pressure fluctuation attenuator and damped system, including piston rod, piston and attenuator shell；Piston rod is fixed on attenuator shell, and piston rod one end is located in attenuator shell, and the other end is pierced by attenuator shell；Piston rod is provided with through-hole in the axial direction, and through-hole is communicated with follow-up oil circuit；Piston is located in attenuator shell, it is provided with piezoelectric ceramics between piston and attenuator shell, and piezoelectric ceramics is in contact with piston, according to the size of pressure fluctuation, it is applied to the voltage at piezoelectric ceramics both ends by changing, changes the rigidity of piezoelectric ceramics, to change piston displacement, hydraulic pressure pulsation decaying is realized in the high-frequency variation for realizing attenuator vome of shell.Novel serial hydraulic pressure pulsation dampening provided by the invention is small compared to oil circuit energy loss caused by conventional hydraulic pressure fluctuation attenuator, has increased the pressure fluctuation bandwidth of inhibition, it can be achieved that the pressure fluctuation in high-pressure oil passage inhibits.
Description
Technical field
The invention belongs to Research of Pressure Ripple for Hydraulic Systems control fields, and in particular to a kind of tandem hydraulic pressure fluctuation decaying
Device and damped system.
Background technology
Axial plunger pump output pressure is high, good reliability is more energy saving compared with the pump of other forms thus extensive
Applied to fields such as aviation aircraft, heavy special equipments.Level of integrated system is improved, reduces equipment volume and has become equipment
The common recognition of manufacturing field.For hydraulic system, if system working pressure is promoted to 56Mpa from 21Mpa, the volume of system will
40% is reduced, weight reduces by 30%.But the raising of pressure will cause the pressure fluctuation of system apparent the case where increasing occur.It is excessive
Pressure fluctuation can cause the appearance of phenomena such as increase and cavitation erosion of system vibration and noise, the abrasion of acceleration system element.
When the fluctuating frequency of pressure with certain element intrinsic frequencies are close in pipeline when, the covibration of generation but will acceleration components damage,
Cause thrashing.Therefore, it is necessary to which the pressure fluctuation to high-pressure hydraulic inhibits.
The inhibition of Research of Pressure Ripple for Hydraulic Systems at present is broadly divided into active pressure pulsation and inhibits to inhibit with passive pressure pulsation
Two ways.Passive pressure pulsation inhibits relatively narrow to the attenuation band of pulsation, in addition uses passive accumulator or surge flask, draws
Enter additional capacitive load, influences the dynamic response process of system.And active control then can preferably avoid the above problem, mesh
The mentality of designing of preceding active pressure pulsation dampening is roughly the same, is the control valve in the bypass setting response of main hydraulic circuit
Or active accumulator utilizes waveform using pressure fluctuation valve body unlatching in short-term and close at generation antiphase on working connection
Principle of stacking eliminates circuit pressure pulsation.Control valve used or active accumulator generally all include piezoelectricity control unit, response speed
Degree is fast, greatly improves the responsive bandwidth of system.But it is this overflow generate fluctuation carry out pressure fluctuation decaying by way of
Big energy can be consumed in high-pressure system.The structure for how designing active pressure pulsation dampening makes it to system pressure arteries and veins
Moving neither influences the dynamic response characteristic of system while decaying, and will not cause larger energy dissipation, in hydraulic pressure system
It is a urgent problem to be solved in system pressure fluctuation attenuation problem.
Invention content
It is an object of the invention to be directed to the above technical problem, it is proposed that a kind of tandem hydraulic pressure fluctuation attenuator and
Damped system, uses for reference the operation principle of accumulator, introduces piezo technology, design can active volume adjusted tandem attenuator,
Eliminate pressure fluctuation phenomenon present in hydraulic circuit, lifting system performance.
In order to achieve the above objectives, the present invention, which adopts the following technical scheme that, is achieved：
A kind of tandem hydraulic pressure fluctuation attenuator, including piston rod, the piston that can slide on the piston rod and
It is series at the attenuator shell that export and import is carried in oil circuit, attenuator shell one end is connected with pump discharge oil circuit, the other end
It is connected with follow-up oil circuit；Piston rod is fixed on attenuator shell, and piston rod one end is located in attenuator shell, the other end
It is pierced by attenuator shell；Piston rod is provided with through-hole in the axial direction, and through-hole is communicated with follow-up oil circuit；Piston is located at attenuator shell
It is interior, piezoelectric ceramics is provided between piston and attenuator shell, and piezoelectric ceramics is in contact with piston, according to pressure fluctuation
Size is applied to the voltage at piezoelectric ceramics both ends by changing, changes the rigidity of piezoelectric ceramics, real to change piston displacement
Hydraulic pressure pulsation decaying is realized in the high-frequency variation of existing attenuator case entrances end cavity volume.
The present invention, which further improves, to be, a pressure inverting is arranged in the attenuator case entrances and exit
Device.
The present invention further improve is, the attenuator shell by taper thread or the screw thread with sealing structure with
Pump discharge oil circuit is connected；The pipe fitting phase of screw thread of the piston rod by taper thread or with sealing structure and follow-up oil circuit
Even.
The present invention, which further improves, to be, the piston is clearance fit with piston rod.
The present invention, which further improves, to be, the piston rod is located at one end in attenuator shell and is equipped with for decaying
The axle end baffle plate of the limit of device piston.
The present invention, which further improves, to be, the axle end baffle plate through-hole entrance is designed with for reducing falling for liquid resistance
Angle.
The present invention, which further improves, to be, the piston rod is fixed on attenuator by the side plate of setting on the piston rod
In inner walls, piezoelectric ceramics is arranged between side plate and piston, and there are cavity, piezoelectric ceramics between piezoelectric ceramics and piston rod
It is arranged symmetrically piston rod；The radial direction of piston rod offers through-hole, which is connected with the through-hole of axis direction.
The present invention, which further improves, to be, the attenuator shell is assemblied in by ring flange in oil circuit；The piezoelectricity
Ceramics are stack piezoelectric ceramics.
A kind of tandem hydraulic pressure fluctuation damped system, respectively at attenuator case entrances and attenuator exit is set
Pressure transmitter is set, the pressure fluctuation p at attenuator case entrances is detected1With the pressure fluctuation p in exit2, and be converted into
Ultra-weak electronic signal, signal processing circuit is filtered the ultra-weak electronic signal of generation, rectification, amplification, conversion, be sent into A/D conversions
Device, A/D converter will treated analog signal the is converted to receivable digital quantity signal of microcontroller, microcontroller is to receiving
Digital quantity signal carries out Fast Fourier Transform (FFT), obtains dominant frequency ω1, second harmonic frequency ω2=2 ω1And third harmonic frequencies
ω3=3 ω1；Optimum control voltage is obtained by rotating vector system optimizing control again, power amplification circuit is according to rotating vector
The optimum control voltage value that system optimizing control calculates generates practical control voltage and acts on piezoelectric ceramics, changes its rigidity,
It realizes that the active to piston displacement is adjusted, changes attenuator case entrances end volume, realize the decaying of pressure fluctuation.
The present invention, which further improves, to be, the specific of optimum control voltage is obtained by rotating vector system optimizing control
Process is as follows：
Pressure is p at collected attenuator case entrances1(k), k=1,2 ... N, N are sampling number, p1(k) arithmetic is flat
Mean value isMean square deviation is
Attenuator outlet pressure is p2(k), k=1,2 ... N, N are sampling number, p2(k) arithmetic mean of instantaneous value isMean square deviation is
Set rotating vectorWherein elements A1、Respectively component of voltageThe amplitude and phase of middle sinusoidal part, A2、Respectively component of voltageThe amplitude and phase of middle sinusoidal part, A3、Respectively component of voltageThe amplitude and phase of middle sinusoidal part；
The object function of rotating vector system optimizing control is：When optimization, first
Randomly generate two target function values not equal vector v1、v2, make the two phasor difference, it is smaller with desired value in difference vector two-end-point
Point be the center of circle, rolling target value it is larger point form new difference vector；Calculate the desired value of new endpoint and the target with the center of circle
Value compares, until its desired value rotates after being less than the desired value in the center of circle around new endpoint again；The mesh after if newly endpoint rotates a circle
Difference vector is reduced 0.618, compares difference vector two again by scale value still greater than the desired value in the center of circle then using the center of circle as fixed point
The desired value of endpoint repeats the process until the desired value of new endpoint is more than the desired value in the center of circle；Rotation and reduction operation are repeated,
Until reaching termination criteria；It is as follows to finally obtain optimum control voltage：
Compared with the existing technology, the present invention has following advantageous effect：
Novel serial hydraulic pressure pulsation dampening provided by the present invention, being pulsed using active pressure, it is tactful to decay,
Inhibit equipment compared to traditional passive type pressure fluctuation, the frequency range of adjusting is wider, and response speed is faster；Using tandem
Mounting means reduces system by way of controlling by-pass throttle and generating antiphase pressure fluctuation progress pressure fluctuation
Energy loss, while also avoiding the problem that the deviation because of antiphase pressure fluctuation waveform causes pressure fluctuation to aggravate.The present invention
Designed pressure fluctuation attenuator, similar with accumulator operation principle, when pressure fluctuation occurs in oil circuit, attenuator piston exists
The mobile volume that can change attenuator in shell eliminates the flowed fluctuation and thus caused pressure fluctuation of oil circuit.The present invention
The novel serial hydraulic pressure pulsation dampening of offer is compared to oil circuit energy caused by conventional hydraulic pressure fluctuation attenuator
It loses small, has increased the pressure fluctuation bandwidth of inhibition, it can be achieved that pressure fluctuation in high-pressure oil passage inhibits.
Further, formula piezoelectric ceramics is stacked by being arranged between attenuator shell and attenuator piston, realized to high frequency
The inhibition of pressure fluctuation.
Further, by the piston rod portion in attenuator, through-hole is radially opened up, liquid resistance is used to form, subtracts simultaneously
The pressure difference at small attenuator both ends reduces the rigidity requirement to stacking formula piezoelectric ceramics.
Further, attenuator shell is by taper thread or the screw thread with sealing structure is connected with pump discharge oil circuit, energy
Enough fluid is avoided to reveal.
Further, the radial direction of piston rod offers through-hole, is used to form liquid resistance, while reducing the pressure at attenuator both ends
Difference reduces the rigidity requirement to stacking formula piezoelectric ceramics；The through-hole is connected with the through-hole of axis direction, piezoelectric ceramics and piston
There are cavitys between bar, and in-line high pressure oil is introduced the attenuator piston other side by through-hole, reduces attenuator piston both sides
Pressure difference reduces the requirement to stacking formula piezoelectric ceramics rigidity size, and in addition the radial through-hole can form restriction, utilize liquid
Impedance can eliminate certain pressure pulsation.
Further, piston rod is provided with through-hole, through-hole and follow-up oil circuit phase by tubing internal diameter standard specification in the axial direction
Logical, liquid caused by which can reduce internal diameter variation hinders.
Further, the axle end baffle plate through-hole entrance in attenuator is designed with chamfering, can reduce liquid resistance.
Further, the middle part of attenuator shell of the invention is connected by ring flange, facilitates production and actual installation.
The present invention is by detecting the pressure fluctuation p at attenuator case entrances1With the pressure fluctuation p in exit2, and by its
Be converted to ultra-weak electronic signal, signal processing circuit is filtered the ultra-weak electronic signal of generation, rectification, amplification, conversion, be sent into A/
D converters, by treated, analog signal is converted to the receivable digital quantity signal of microcontroller, microcontroller docking to A/D converter
The digital quantity signal received carries out Fast Fourier Transform (FFT), obtains dominant frequency ω1, second harmonic frequency ω2=2 ω1And it is humorous three times
Wave frequency rate ω3=3 ω1；On obtained three frequency bases, optimum control is obtained by rotating vector system optimizing control
Voltage, power amplification circuit generate practical control voltage according to the optimum control voltage value that rotating vector system optimizing control calculates
It acts on piezoelectric ceramics, changes its rigidity, realize that the active to piston displacement is adjusted, change attenuator case entrances end and hold
Product, realizes that the decaying of pressure fluctuation, this method neither influence the dynamic response characteristic of system, and will not cause larger energy wave
Take, eliminates pressure fluctuation phenomenon present in hydraulic circuit, lifting system performance, and be easily achieved.
Description of the drawings
Fig. 1 is the fundamental diagram of tandem hydraulic pressure fluctuation attenuator of the present invention；
Fig. 2 is control system schematic diagram of the present invention.
Fig. 3 is control strategy schematic diagram of the present invention.
In figure：1 is attenuator shell, and 2 be fixing screws, and 3 be axle end baffle plate, and 4 be connection bolt, and 5 be the first sealing ring,
6 be piston, and 7 be piezoelectric ceramics, and 8 be gasket, and 9 be the second sealing ring, and 10 be piston rod, and 11 be pressure transmitter, and 12 be control
Circuit processed.
Specific implementation mode
The present invention is described in further detail below in conjunction with the accompanying drawings.
Novel serial hydraulic pressure pulsation dampening of the present invention, structure is as shown in Figure 1, include attenuator shell 1, solid
Determine screw 2, axle end baffle plate 3, connection bolt 4, the first sealing ring 5, attenuator piston 6, stack formula piezoelectric ceramics 7, gasket 8,
Second sealing ring 9, piston rod 10 and control section, control section include pressure transmitter 11, signal processing circuit, A/D turn
Parallel operation, microcontroller, D/A converter and power amplification circuit.The novel serial hydraulic pressure pulsation dampening main body by
Attenuator shell 1, attenuator piston 6, stacks formula piezoelectric ceramics 7, the composition of piston rod 10 at axle end baffle plate 3.
Attenuator shell 1 carries export and import in the present invention, and a pressure inverting is arranged at inlet and outlet
Device 11, pressure transmitter 11 detect pressure fluctuation, and the frequency distribution to analyze pressure fluctuation provides foundation；Attenuator shell 1 is gone here and there
It is coupled in oil circuit, and screw thread of the attenuator shell 1 by taper thread or with sealing structure is connected with pump discharge oil circuit；It is described
Screw thread of the piston rod 10 by taper thread or with sealing structure is connected with the pipe fitting of follow-up oil circuit.
10 one end of piston rod is located in attenuator shell 1, and the other end is pierced by attenuator shell 1, piston rod 10 and attenuator
The position outer sheath that shell 1 contacts is equipped with the second sealing ring 9；Piston rod 10 is provided with by tubing internal diameter standard specification in the axial direction
Through-hole, through-hole are communicated with follow-up oil circuit, and through-hole liquid caused by for reducing internal diameter variation hinders；Piston 6 is located at attenuator shell 1
Interior, piston 6 is clearance fit with piston rod 10, can slide on piston rod 10, be arranged between piston 6 and attenuator shell 1
There is piezoelectric ceramics 7, and piezoelectric ceramics 7 is in contact with piston 6, piezoelectric ceramics 7 is symmetrical arranged about piston rod 10, and is arranged
In one end far from oil inlet；Change pressure by changing the voltage being applied on piezoelectric ceramics 7 according to the size of pressure fluctuation
The rigidity of electroceramics 7 realizes the high-frequency variation of 1 input end cavity volume of attenuator shell to change 6 displacement of piston, real
Existing hydraulic pressure pulsation decaying.
Piston rod 10 is fixed on attenuator shell 1, specifically, piston rod 10 is by being arranged the side plate on piston rod 10
It is fixed on 1 inner wall of attenuator shell, and gasket 8 is provided between 1 inner wall of side plate and attenuator shell；Piezoelectric ceramics 7
It is arranged between side plate and piston 6, there are cavitys between piezoelectric ceramics 7 and piston rod 10；The radial direction of piston rod 10 offers logical
Hole, the through-hole are connected with the through-hole of axis direction.
The piston rod 10, which is located at the shaft end that one end in attenuator shell 1 is equipped with for being limited to attenuator piston 6, to be kept off
Plate 3.3 through-hole entrance of the axle end baffle plate is designed with the chamfering for reducing liquid resistance.
The attenuator shell 1 is assemblied in by ring flange in oil circuit, and ring flange is fixed by connecting bolt 4, and
Junction is provided with the first sealing ring 5.
Piezoelectric ceramics 7 is stack piezoelectric ceramics in the present invention.
Specifically, the tandem hydraulic pressure fluctuation attenuator of the present invention further includes a core control circuit 12, the control
Circuit 12 processed is integrated with microcontroller and signal processing circuit.A pressure transmitter is arranged at the inlet and outlet of attenuator,
The pressure fluctuation at attenuator inlet and outlet is detected, microcontroller is sent into and makees Fast Fourier Transform (FFT), to stack formula piezoelectric ceramics
Control voltage calculate provide data.The pressure signal that signal processing circuit acquires pressure transmitter is filtered, amplifies, believes
Number conversion and the operations such as rectification.Microcontroller carries out Fast Fourier Transform (FFT) to the pressure signal of acquisition.In addition it is integrated in microcontroller
Rotating vector system optimizing control, the pressure fluctuation mean square deviation that attenuator is imported and exported to both ends introduce optimization object function, control
Voltage is made of three parts, for inhibiting to the dominant frequency of pressure fluctuation, second harmonic, triple-frequency harmonics.Rotating vector is by three
Amplitude, the phase of part control voltage sinusoidal part are constituted, the frequency of control voltage sinusoidal part and the dominant frequency of pressure fluctuation, two
Subharmonic, triple-frequency harmonics are identical.By repeating rotation, shrinkage operation to rotating vector, solution can be minimized attenuator disengaging
The practical control voltage of mouth pressure at two ends pulsation mean square deviation, is applied to pressure stack electroceramics both ends.
A kind of tandem hydraulic pressure fluctuation damped system, the tandem hydraulic pressure fluctuation attenuator at work,
Pressure transmitter is set at attenuator case entrances and at attenuator housing outlets respectively, detects the pressure fluctuation p of entrance1
With the pressure fluctuation p in exit2, and be converted into ultra-weak electronic signal, signal processing circuit to the ultra-weak electronic signal of generation into
Row filtering, rectification, amplification, conversion, are sent into A/D converter, A/D converter general treated analog signal is converted to microcontroller can
The digital quantity signal of reception, microcontroller carry out Fast Fourier Transform (FFT) to the digital quantity signal received, obtain dominant frequency ω1, two
Subfrequency ω2=2 ω1And third harmonic frequencies ω3=3 ω1。
Program is write in microcontroller, can realize rotating vector system optimizing control, optimal control value is obtained by calculation；
Pressure is p at collected attenuator case entrances1(k), k=1,2 ... N, N are sampling number, p1(k) arithmetic is flat
Mean value isMean square deviation is
Attenuator outlet pressure is p2(k), k=1,2 ... N, N are sampling number, p2(k) arithmetic mean of instantaneous value isMean square deviation is
Set rotating vectorWherein elements A1、Respectively component of voltageThe amplitude and phase of middle sinusoidal part, A2、Respectively component of voltageThe amplitude and phase of middle sinusoidal part, A3、Respectively component of voltageThe amplitude and phase of middle sinusoidal part.
The object function of rotating vector system optimizing control is：When optimization, first with
Machine generates the vector v that two target function values do not wait1、v2, make the two phasor difference, it is smaller with desired value in difference vector two-end-point
Point is the center of circle, and the larger point of rolling target value forms new difference vector；Calculate the desired value of new endpoint and the desired value with the center of circle
Compare, until its desired value rotates after being less than the desired value in the center of circle around new endpoint again；The target after if newly endpoint rotates a circle
It is worth the desired value still greater than the center of circle, then using the center of circle as fixed point, difference vector is reduced 0.618, compares two ends of difference vector again
The desired value of point repeats the process until the desired value of new endpoint is more than the desired value in the center of circle；Rotation and shrinkage operation are repeated, directly
To reaching termination criteria.In practice, termination criteria is set as needed is less than given value for L.
It is as follows to finally obtain optimum control voltage：
Power amplification circuit generates practical control according to the optimum control voltage value that rotating vector system optimizing control calculates
Voltage, which acts on, to be stacked on formula piezoelectric ceramics 7, changes its rigidity, realizes that the active to 6 displacement of piston is adjusted, change attenuator into
Mouth end volume, realizes the decaying of pressure fluctuation.In addition, axle end baffle plate 3 realizes that the limit to attenuator piston 6 operates.
The tandem hydraulic pressure fluctuation attenuator of the present invention uses following critical piece：
(1) attenuator shell：Designed, designed drawing is processed.
(2) axle end baffle plate：Designed, designed drawing is processed.
(3) sealing ring：It is sought according to sealing ring standard size dimensions.
(4) attenuator piston：Designed, designed drawing is processed.
(5) piston rod：Designed, designed drawing is processed.
(6) formula piezoelectric ceramics is stacked：Material and size designed, designed.
(7) pressure transmitter：Kavlico PT250 series, CST companies of the U.S..
(6) power amplifier：Using the devices such as IRF540 and MUR820, ST companies.
(7) A/D converter：ADC0808, National Semiconductor companies of the U.S..
(8) microcontroller：ARM9, Silicon Lab companies.
(9) D/A converter：ADC0809, National Semiconductor companies of the U.S..
Attenuator body in the present invention is made of shell, piston and the formula piezoelectric ceramics that stacks therebetween.It is logical
The pressure transmitter detection pressure fluctuation for being distributed in attenuator inlet and outlet both ends is crossed, is sent by signal processing and A/D conversions single
Piece machine makees Fast Fourier Transform (FFT), obtains pressure fluctuation dominant frequency and second harmonic, triple-frequency harmonics.Two side pressures are imported and exported with attenuator
Target passes through power amplification to the mean square deviation of power pulsation using rotating vector system optimizing control calculating control voltage as an optimization
Circuit, which is applied to, stacks formula piezoelectric ceramics both ends, causes the variation of attenuator entrance volume, absorbs pressure fluctuation in oil circuit.This
The novel serial hydraulic pressure pulsation dampening provided is invented compared to oil circuit caused by conventional hydraulic pressure fluctuation attenuator
Energy loss is small, has increased the pressure fluctuation bandwidth of inhibition, it can be achieved that the pressure fluctuation in high-pressure oil passage inhibits.
The foregoing is merely one embodiment of the present invention, it is not all of or unique embodiment, this field is common
Any equivalent transformation that technical staff takes technical solution of the present invention by reading description of the invention, is the present invention
Claim covered.
Claims (2)
1. a kind of damped system based on tandem hydraulic pressure fluctuation attenuator, it is characterised in that：Tandem hydraulic pressure arteries and veins
The structure of dynamic attenuator is as follows：Including piston rod（10）, can be in piston rod（10）The piston of upper sliding（6）And it is series at oil
The attenuator shell of export and import is carried in road（1）, attenuator shell（1）One end is connected with pump discharge oil circuit, the other end with
Follow-up oil circuit is connected；Piston rod（10）It is fixed on attenuator shell（1）On, and piston rod（10）One end is located at attenuator shell
（1）Interior, the other end is pierced by attenuator shell（1）；Piston rod（10）It is provided with through-hole, through-hole and follow-up oil circuit phase in the axial direction
It is logical；Piston（6）Positioned at attenuator shell（1）It is interior, piston（6）With attenuator shell（1）Between be provided with piezoelectric ceramics（7）, and
And piezoelectric ceramics（7）With piston（6）It is in contact, according to the size of pressure fluctuation, piezoelectric ceramics is applied to by changing（7）Both ends
Voltage, change piezoelectric ceramics（7）Rigidity, to change piston（6）Attenuator shell is realized in displacement（1）Input end vessel
The high-frequency of volume changes, and realizes hydraulic pressure pulsation decaying；
The attenuator shell（1）A pressure transmitter is arranged at inlet and outlet；
The attenuator shell（1）By taper thread or the screw thread with sealing structure is connected with pump discharge oil circuit；The piston
Bar（10）By taper thread or the screw thread with sealing structure is connected with the pipe fitting of follow-up oil circuit；
The piston（6）With piston rod（10）For clearance fit；
The piston rod（10）Positioned at attenuator shell（1）Interior one end is equipped with for attenuator piston（6）Limit axis
End-stopping plate（3）；
The axle end baffle plate（3）Through-hole entrance is designed with the chamfering for reducing liquid resistance；
The piston rod（10）By being arranged in piston rod（10）On side plate be fixed on attenuator shell（1）On inner wall, piezoelectricity
Ceramics（7）It is arranged in side plate and piston（6）Between, piezoelectric ceramics（7）With piston rod（10）Between there are cavity, piezoelectric ceramics
（7）About piston rod（10）It is symmetrical arranged；Piston rod（10）Radial direction offer through-hole, the through-hole phase of the through-hole and axis direction
Connection；
The attenuator shell（1）It is assemblied in oil circuit by ring flange；The piezoelectric ceramics（7）For stack piezoelectric ceramics；
Damped system detailed process is as follows：
Respectively at attenuator case entrances and attenuator exit be arranged pressure transmitter, detect attenuator case entrances at
Pressure fluctuationWith the pressure fluctuation in exit, and it is converted into ultra-weak electronic signal, signal processing circuit is to the micro- of generation
Weak electric signal is filtered, rectification, amplification, conversion, be sent into A/D converter, A/D converter will treated analog signal conversion
For the receivable digital quantity signal of microcontroller, microcontroller carries out Fast Fourier Transform (FFT) to the digital quantity signal received, obtains
Dominant frequency, second harmonic frequencyAnd third harmonic frequencies；Pass through rotating vector system optimizing control again
Optimum control voltage is obtained, power amplification circuit is generated according to the optimum control voltage value that rotating vector system optimizing control calculates
Practical control voltage acts on piezoelectric ceramics, changes its rigidity, realizes that the active to piston displacement is adjusted, changes attenuator shell
Body input end volume, realizes the decaying of pressure fluctuation.
2. a kind of damped system of tandem hydraulic pressure fluctuation attenuator according to claim 1, it is characterised in that：It is logical
Cross rotation vector optimization control algolithm obtain optimum control voltage detailed process it is as follows：
Pressure is at collected attenuator case entrances,, NFor sampling number,Arithmetic mean of instantaneous value
For, mean square deviation is；
Attenuator outlet pressure is,, NFor sampling number,Arithmetic mean of instantaneous value is, mean square deviation is ；
Set rotating vector, wherein element、Respectively component of voltageThe amplitude and phase of middle sinusoidal part,、Respectively component of voltageThe amplitude and phase of middle sinusoidal part,、Respectively component of voltageThe amplitude and phase of middle sinusoidal part；
The object function of rotating vector system optimizing control is：, when optimization, randomly generate first
The vector that two target function values do not wait、, make the two phasor difference, be circle with the smaller point of desired value in difference vector two-end-point
The heart, the larger point of rolling target value form new difference vector；Calculate the desired value of new endpoint and compared with the desired value in the center of circle, directly
It is less than after the desired value in the center of circle to its desired value and is rotated again around new endpoint；If new endpoint rotate a circle after desired value still greater than
Difference vector is reduced 0.618, compares the target of two endpoints of difference vector again by the desired value in the center of circle then using the center of circle as fixed point
Value repeats the process until the desired value of new endpoint is more than the desired value in the center of circle；Rotation and reduction operation are repeated, until reaching eventually
Only standard；It is as follows to finally obtain optimum control voltage：
。
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| CN106704167B (en) * | 2016-12-19 | 2018-05-08 | 浙江大学 | A kind of pressure fluctuation attenuating device for the adjustable damping frequency being integrated in plunger pump |
| CN107478419B (en) * | 2017-07-13 | 2019-06-21 | 江苏科技大学 | A kind of pulsation dampening performance testing device and test method |
| CN110939614B (en) * | 2019-12-14 | 2021-06-25 | 哈尔滨工业大学 | Broadband spring oscillator hydraulic pulsation attenuator |
| CN111237293B (en) * | 2020-01-14 | 2021-03-09 | 北京航空航天大学 | Design method of pressure pulsation attenuator integrated in constant-voltage variable pump |
| CN113328652B (en) * | 2021-06-23 | 2022-09-02 | 青岛科技大学 | Piezoelectric energy harvester with adjustable energy harvesting frequency based on piezoelectric film |
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