CN102359533B - Piezoelectric stack type self-energized adjustable hydraulic damper - Google Patents
Piezoelectric stack type self-energized adjustable hydraulic damper Download PDFInfo
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- CN102359533B CN102359533B CN 201110275848 CN201110275848A CN102359533B CN 102359533 B CN102359533 B CN 102359533B CN 201110275848 CN201110275848 CN 201110275848 CN 201110275848 A CN201110275848 A CN 201110275848A CN 102359533 B CN102359533 B CN 102359533B
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Abstract
The invention relates to a piezoelectric stack type self-energized adjustable hydraulic damper, which belongs to the hydraulic damper. A hydraulic cylinder body is arranged on a main body through a screw; the main body is arranged on a pedestal; a piston of the hydraulic cylinder is arranged in the cylinder body; an upper cavity of the cylinder body is communicated with one group of pipelines on the main body through a pipe joint; a lower cavity of the cylinder body is communicated with another group of pipelines on the main body; two groups of pipelines on the main body are communicated with a ring slot on a damping adjusting valve core respectively; one group of pipelines on the main body are also connected with an energy storage device; and the two groups of pipelines on the main body are also communicated with fluid cavities of two groups of power generation devices respectively. The hydraulic damper has the advantages of no need of external energy supply or extra peripheral equipment of sensor, motor, hydraulic pump and the like, capability of automatically adjusting damping according to an environmental vibration condition, high environmental adaptability, simple control method, simple structure, small size and high integration level.
Description
Technical field
The invention belongs to antivibration area, relate to a kind of hydraulic damper, be specifically related to a kind of hydraulic damper that generates electricity, powers and carry out the damping adjusting based on the piezoelectric stack transducer, be applicable to vibration suppression and the elimination of the traffic tool, machinery etc.
Background technique
Hydraulic damper is widely used in the vibration control field of the traffic tool, machinery etc.Early stage passive type hydraulic damper is simple in structure, cost is low, technology is ripe, but because of damping non-adjustable, the adaptability of its effectiveness in vibration suppression and environment is relatively poor, be unsuitable for some and require preferably occasion of vibration control effect, as motor car engine and vehicle frame suspend, Large-Scale Precision Instrument and Equipment vibration damping etc.Therefore, people have proposed active, semi-active type hydraulic damper with adjustable, the active adjustable damper that namely utilizes motor-driven hydraulic pumps power to be provided and to be controlled by electromagnetic switch/overflow/reduction valve (or a plurality of one-way valve) is such as Chinese invention patent CN1367328A, CN101392809A etc.Compare in the non-adjustable hydraulic damper of passive type, the control of active hydraulic damper with adjustable is effective, vibration environment adaptable, application has succeeded at aspects such as automobile active engine mounts; But existing active hydraulic damping regulation technology also comes with some shortcomings, as:
The larger pumping plant of needs drives, a plurality of solenoid valve jointly controls,
Need sensor to carry out the detection of vibrational state,
Need lasting external energy supply.As seen, the systems bulky of existing active hydraulic damper with adjustable, connection and control are complicated, reliability is lower, has certain narrow limitation in application.
Summary of the invention
For solving the problems referred to above of existing hydraulic damping damping technology, the present invention proposes a kind of hydraulic damper that utilizes the generating of piezoelectric stack transducer, powers and carry out the damping adjusting, the mechanical energy that namely will vibrate main body by the coupling of piezoelectric stack and hydraulic fluid converts electric energy to, the voltage signal that generates is (function of sensor) except directly being used to the vibrational state testing signal, also is used to the status adjustment of orifice valve after conversion treatment.
The technological scheme that the present invention takes is, hydraulic cylinder is installed on the main body by screw, and described main body is installed on the base by screw; Described hydraulic cylinder piston is installed on cylinder interior and described cylinder body is separated into cylinder body epicoele and cylinder body cavity of resorption, and described cylinder body epicoele is by one group of pipeline communication on pipe joint and the described main body, and another on described cylinder body cavity of resorption and the main body organized pipeline communication; Two groups of pipelines on the described main body are communicated with annular groove on the damping regulating spool respectively; One group of pipeline on the described main body also links to each other with accumulator; Two groups of pipelines on the described main body also communicate with the fluid chamber of two groups of electricity generating devices respectively, and described electricity generating device is connected by wire with the damping modulating valve and is connected with ECU (Electrical Control Unit).
Electricity generating device of the present invention is made of with piezoelectric stack the fluid chamber that places body interior, butterfly spring one, generating chamber piston and generating, and described butterfly spring one, generating chamber piston, generating are crimped in the main body by base with piezoelectric stack;
Damping modulating valve of the present invention is made of with piezoelectric stack spool, butterfly spring two and driving, and described spool, butterfly spring two, driving are crimped in the integrated package by base with piezoelectric stack, and described spool is provided with circular groove.
ECU (Electrical Control Unit) of the present invention comprises rectifier bridge, cymoscope, comparator, reaches one group of control switch formation, and its function is to carry out energy recovery and the control of orifice valve switch.
Under the vibration damper off working state, two cavitys of oil hydraulic cylinder and all ducted hydrodynamic pressures equate, are the set pressure of accumulator, generating piezoelectric stack preloading power, and the piezoelectric stack of valve control is not subjected to External Force Acting and makes spool be in normally open.After entering steady operation, moving up and down of hydraulic cylinder piston changes system fluid pressure (two groups of generating piezoelectric stack stresses), thereby converts the pressure energy of fluid to electric energy.The electric energy that generates is through further being used for control damping modulating valve after the conversion treatment, and the motion state of damping modulating valve is determined by size and the waveform of institute's formation voltage.
The invention has the advantages that:
Need not extraneous energy supply, reliability height, can not affect the control effect because of energy shortage;
Need not extra sensor, environmental suitability is strong, controlling method is simple, is that voltage signal is adjusted damping automatically according to Vibration Condition;
Simple in structure, volume is little, level of integration is high, good airproof performance, need not the peripheral unit such as motor, pump, solenoid valve;
Do not produce/be not subjected to electromagnetic interference, more be applicable to the environment of high magnetic fields, intense radiation.Therefore, piezo-stack type self-energized adjustable hydraulic damper of the present invention also is suitable for microsystem and the tele-control systems such as Aero-Space, intelligence structure except being applicable to the large-scale traffic tool and machine tool.
Description of drawings
Fig. 1 is structure and the generalized section thereof of a preferred embodiment of the present invention;
Fig. 2 is the A-A sectional view of a preferred embodiment of the present invention Fig. 1;
Fig. 3 (a) is a preferred embodiment of the present invention generating piezoelectric stack 5a3 output voltage waveform;
Fig. 3 (b) is a preferred embodiment of the present invention generating piezoelectric stack 5b3 output voltage waveform;
Fig. 3 (c) is the generating voltage oscillogram after a preferred embodiment of the present invention rectification;
Fig. 3 (d) is that a preferred embodiment of the present invention drives with piezoelectric stack 63 power supply voltage oscillograms;
Fig. 3 (e) is the displacement diagram figure of a preferred embodiment of the present invention damping spool 62;
Fig. 4 (a) is the front damping valve opening aperture figure of power supply in a preferred embodiment of the present invention;
Fig. 4 (b) is the rear damping valve opening aperture figure of power supply in a preferred embodiment of the present invention;
Fig. 5 is the ECU (Electrical Control Unit) circuit theory diagrams of a preferred embodiment of the present invention.
Embodiment
Electricity generating device of the present invention is made of with piezoelectric stack the fluid chamber that places body interior, butterfly spring one, generating chamber piston and generating, and described butterfly spring, generating chamber piston, generating are crimped in the main body by base with piezoelectric stack;
Damping modulating valve of the present invention is made of with piezoelectric stack spool, butterfly spring and driving, and described spool, butterfly spring, driving are crimped in the main body by base with piezoelectric stack, and described spool is provided with circular groove.
ECU (Electrical Control Unit) of the present invention mainly comprises rectifier bridge, cymoscope, comparator, reaches one group of control switch formation, and its function is to carry out energy recovery and the control of orifice valve switch.
As shown in Figure 1 and Figure 2, consisted of by hydraulic cylinder 1, hydraulic cylinder piston 2, pipe joint 3, main body 4, base 7, ECU (Electrical Control Unit) 8, accumulator 9 that electricity generating device 5a and electricity generating device 5b and damping modulating valve 6 be installed; Described electricity generating device 5a is made of with piezoelectric stack 5a3 and fluid chamber 5a4 butterfly spring one 5a1 that places main body 4 inside, generating chamber piston 5a2 and generating; Described electricity generating device 5b is made of with piezoelectric stack 5b3 and fluid chamber 5b4 the butterfly spring 5b1 that places main body 4 inside, generating chamber piston 5b2 and generating; Described damping modulating valve 6 is made of with piezoelectric stack 63 butterfly spring 2 61, spool 62 and driving; Described cylinder body 1 is installed on the main body 4 by screw, and described main body 4 is installed on the base 7 by screw; Described piston 2 is installed on cylinder body 1 inside and described cylinder body 1 is separated into cylinder body epicoele C1 and cylinder body cavity of resorption C2; Described cylinder body epicoele C1 is communicated with pipeline 42a and 41a on the described main body 4 by pipe joint 3, and described cylinder body cavity of resorption C2 is communicated with pipeline 40,41b, 42b and accumulator 9 on the main body 4 successively; Described pipeline 42a and 42b are communicated with annular groove on the spool 62 respectively; Butterfly spring one 5a1, the piston 5a2 of described electricity generating device 5a, generating are crimped in the main body 4 by base 7 with piezoelectric stack 5a3; Butterfly spring one 5b1, the piston 5b2 of described electricity generating device 5b, generating are crimped in the main body 4 by base 7 with piezoelectric stack 5b3; The butterfly spring 2 61 of described damping modulating valve 6, spool 62, driving are crimped in the main body 4 by base 7 with piezoelectric stack 63; Described invention electricity is connected 63 to be connected with ECU (Electrical Control Unit) 8 by wire respectively with piezoelectric stack 5a3,5b3 with driving.
As shown in Figure 1, under the damper off working state, hydrodynamic pressure in all pipelines on cylinder body epicoele C1, cylinder body cavity of resorption C2 and the main body 4 equates, be the set pressure of accumulator 9, invention piezoelectric stack 5a3 and 5b3 preloading power, drive and be not subjected to fluid pressure action with piezoelectric stack 63, spool 62 is in normally open.After damper regulator entered steady operation, hydraulic cylinder piston 2 moved up and down with the vibration main body, and then intrasystem hydrodynamic pressure and generating are changed with piezoelectric stack 5a3 and 5b3 stress, thereby converted the pressure energy of fluid to electric energy.Described generating flows to ECU (Electrical Control Unit) 8 with the electric energy that piezoelectric stack 5a3 and 5b3 generate through wire, again through further flowing to driving piezoelectric stack 63 after the conversion treatment, driving is extended by the voltage effect with piezoelectric stack 63, thereby reduces aperture, the increase damping force of damping hole.Especially, the motion state of damping spool 62 is directly controlled with piezoelectric stack 5a3 and 5b3 institute formation voltage by generating.
As shown in Figure 1 and Figure 2, when steady operation, when hydraulic cylinder piston 2 is moved upward by External Force Acting, hydrodynamic pressure in the cylinder body epicoele C1 raises, the hydrodynamic pressure of cylinder body cavity of resorption C2 reduces, liquid in the cylinder body epicoele C1 enters pipeline 42a, fluid chamber 5a4 and pipeline 41a on the main body 4 through pipe joint 3, and pipeline 42b enters cylinder body cavity of resorption C2 on the annular groove on the spool 62, main body 4 again; Simultaneously, the liquid in the accumulator 9 also enters cylinder body cavity of resorption C2 through pipeline 42b; Because pipeline 41a, 42a and fluid chamber 5a4 fluid pressure raise, the hydrodynamic pressure of pipeline 41b, 42b and fluid chamber 5b4 reduces, generating is compressed with piezoelectric stack 5a3, piezoelectric stack 5b3 replys distortion under the effect of self elastic force, and its voltage waveform that generates is shown in Fig. 3 (a), 3 (b); When hydraulic cylinder piston 2 moved downward, power generation process was similar, and only the voltage waveform phase generate of piezoelectric stack 5a3 and 5b3 output changes.
Shown in Fig. 1, Fig. 4 (a), Fig. 4 (b), the driving piezoelectric stack 63 of damping modulating valve 6 power on rear elongation, promote spool 62 motions, thereby effective flow area of described valve is reduced, play the effect that increases damping; Described piezoelectric stack 63 powers on contrast that forward and backward spool 62 damping hole apertures change as shown in Figure 4.
Fig. 3 (a) ~ Fig. 3 (e) be send out in the embodiment of the invention/power supply voltage waveform and spool travel concern comparison diagram;
Voltage waveform shown in Fig. 3 (a), 3 (b) has reflected that directly hydraulic piston 1(namely vibrates main body) Vibration Condition, therefore generating also has the function of vibration detecting sensor with piezoelectric stack 5a3 or 5b3.Increase damping when leaving the equilibrium position as purpose take vibration main body (piston 2), the control principle of ECU (Electrical Control Unit) 8 of the present invention comprises that mainly rectifier bridge 81 and 85, extreme value cymoscope 82, zero point cymoscope 83, comparator 84, interlock power switch k1 and discharge switch k2 consist of as shown in Figure 5.Be to improve power supply capacity, electricity generating device 5a of the present invention and 5b all comprise at least one pair of identical generating with piezoelectric stack 5a3 and 5b3, and described piezoelectric stack adopts parallel way to connect when being a plurality of.The voltage that electricity generating device 5a and 5b produce is respectively through rectifier bridge 81 and rectifier bridge 85 rectifications, and the voltage waveform after the rectification is identical, shown in Fig. 3 (c).The voltage of electricity generating device 5a output is exported to cymoscope 82 and 83 and is carried out the voltage waveform detection after rectification, comparator 83 carries out the testing result contrast, again according to the comparing result control switch k1 of comparator 83 and the break-make of k2.
Power switch k1 connects during original state, and generating is with piezoelectric stack 5a3,5b3 and drive with piezoelectric stack 63 parallel connections the voltage that described generating produces with piezoelectric stack 5a3,5b3
Be applied directly to drive with piezoelectric stack 63 two ends (
), move on the spool 62 and make that the damping hole flow area reduces, damping increases; When
When reaching extreme value, power switch k1 disconnects, discharge switch k2 connects, and drives with piezoelectric stack 63 both end voltage
Be down to zero, described driving is shortened (recovery natural length) with piezoelectric stack 63 under the effect of self elastic force, and spool 62 moves down under the butterfly spring effect and makes that the damping hole aperture increases, deattenuation; Simultaneously,
Reduce rapidly,
Power switch k1 connects when being down to for zero (being equivalent to original state), discharge switch k2 disconnects, and drives with again power on elongation and make the damping increase of piezoelectric stack 63; According to the variation of generating with the piezoelectric stack voltage waveform, alternately connecting and disconnecting of switch k1 and k2, thus realized the automatic regulation function of damping.The power supply voltage of driving usefulness piezoelectric stack 63 and the displacement diagram of spool 62 are shown in Fig. 3 (d) and Fig. 3 (e).
According to the principle that overall charge amount before and after each piezoelectric stack parallel connection equates, the power supply voltage of piezoelectric stack 63 is:
, wherein,
Be the output voltage of piezoelectric stack 5a3 and 5b3,
For the electric capacity of piezoelectric stack 63,
Be the electric capacity of piezoelectric stack 5a3 and 5b3,
nQuantity for piezoelectric stack 5a3 and piezoelectric stack 5b3.
Claims (4)
1. a piezo-stack type self-energized adjustable hydraulic damper is characterized in that, hydraulic cylinder is installed on the main body by screw, and described main body is installed on the base by screw; Described hydraulic cylinder piston is installed on cylinder interior and described cylinder body is separated into cylinder body epicoele and cylinder body cavity of resorption, and described cylinder body epicoele is by one group of pipeline communication on pipe joint and the described main body, and another on described cylinder body cavity of resorption and the main body organized pipeline communication; Two groups of pipelines on the described main body are communicated with annular groove on the damping regulating spool respectively; One group of pipeline on the described main body also links to each other with accumulator; Two groups of pipelines on the described main body also communicate with the fluid chamber of two groups of electricity generating devices respectively, and described electricity generating device is connected by wire with orifice valve and is connected with ECU (Electrical Control Unit).
2. piezo-stack type self-energized adjustable hydraulic damper according to claim 1 is characterized in that, described electricity generating device is made of with piezoelectric stack the fluid chamber that places body interior, butterfly spring one, generating chamber piston and generating; Described butterfly spring one, generating chamber piston, generating are crimped in the main body by base with piezoelectric stack.
3. piezo-stack type self-energized adjustable hydraulic damper according to claim 1, it is characterized in that, described damping modulating valve is made of with piezoelectric stack spool, butterfly spring two and driving, described spool, butterfly spring two, driving are crimped in the main body by base with piezoelectric stack, and described spool is provided with circular groove.
4. piezo-stack type self-energized adjustable hydraulic damper according to claim 1 is characterized in that, described ECU (Electrical Control Unit) comprises rectifier bridge, cymoscope, comparator, reaches one group of control switch, is used for carrying out energy and reclaims conversion and the control of orifice valve switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110275848 CN102359533B (en) | 2011-09-18 | 2011-09-18 | Piezoelectric stack type self-energized adjustable hydraulic damper |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110275848 CN102359533B (en) | 2011-09-18 | 2011-09-18 | Piezoelectric stack type self-energized adjustable hydraulic damper |
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| CN102359533A CN102359533A (en) | 2012-02-22 |
| CN102359533B true CN102359533B (en) | 2013-01-02 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9371883B2 (en) * | 2011-07-28 | 2016-06-21 | Robert H. Wehr | Inertial terrain transit event manager apparatus |
| CN103016599B (en) * | 2012-12-13 | 2014-10-15 | 浙江师范大学 | Integrated type self-powered hydraulic damper |
| CN102979849B (en) * | 2012-12-13 | 2015-04-01 | 浙江师范大学 | Active-type piezoelectric hydraulic damper |
| CN102979851B (en) * | 2012-12-13 | 2014-09-17 | 浙江师范大学 | Wafer-type piezoelectric hydraulic damper based on curve surface spacing |
| CN103016597B (en) * | 2012-12-13 | 2014-08-13 | 浙江师范大学 | Self-powered damper based on vibration energy recovery |
| CN103267081B (en) * | 2013-05-10 | 2016-01-27 | 河南理工大学 | A kind of piezoelectric power generation type damping-adjustable hydro-pneumatic suspension for engineering machinery or farm machinery |
| CN105275919B (en) * | 2015-11-30 | 2017-08-22 | 长春工业大学 | Cymbal type piezoelectric element external generating cylinder |
| CN107345551B (en) * | 2017-08-17 | 2023-01-31 | 浙江师范大学 | Self-supply damper |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1367328A (en) * | 2002-03-15 | 2002-09-04 | 浙江大学 | Vehicle suspension damping active adjustable hydraulic vibration reducer |
| CN101392809A (en) * | 2007-09-21 | 2009-03-25 | 利勃海尔航空航天林登贝格股份有限公司 | Active hydraulic damper and hydraulic actuator |
| CN202228583U (en) * | 2011-09-18 | 2012-05-23 | 浙江师范大学 | Piezo-stack type self-energized adjustable hydraulic damper |
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2011
- 2011-09-18 CN CN 201110275848 patent/CN102359533B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1367328A (en) * | 2002-03-15 | 2002-09-04 | 浙江大学 | Vehicle suspension damping active adjustable hydraulic vibration reducer |
| CN101392809A (en) * | 2007-09-21 | 2009-03-25 | 利勃海尔航空航天林登贝格股份有限公司 | Active hydraulic damper and hydraulic actuator |
| CN202228583U (en) * | 2011-09-18 | 2012-05-23 | 浙江师范大学 | Piezo-stack type self-energized adjustable hydraulic damper |
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Granted publication date: 20130102 Termination date: 20130918 |