CN102359533A - Piezoelectric stack type self-energized adjustable hydraulic damper - Google Patents
Piezoelectric stack type self-energized adjustable hydraulic damper Download PDFInfo
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- CN102359533A CN102359533A CN2011102758481A CN201110275848A CN102359533A CN 102359533 A CN102359533 A CN 102359533A CN 2011102758481 A CN2011102758481 A CN 2011102758481A CN 201110275848 A CN201110275848 A CN 201110275848A CN 102359533 A CN102359533 A CN 102359533A
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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, supplies power and carry out the damping adjusting based on the piezoelectric stack transducer, be applicable to the 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 inappropriate for some and require vibration control effect occasion preferably, 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 adjustable hydraulic damper; The active adjustable damper that promptly 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 like Chinese invention patent CN1367328A, CN101392809A etc.Compare in the non-adjustable hydraulic damper of passive type, the control of active adjustable hydraulic damper is effective, the adaptive capacity of vibration environment is strong, succeed to use at aspects such as automobile active engine mounts; But existing active hydraulic damping regulation technology also comes with some shortcomings; As: the bigger pumping plant of
needs drives, a plurality of solenoid valve jointly controls;
needs sensor to carry out the detection of vibrational state,
need lasting external energy supply.It is thus clear that the systems bulky of existing active adjustable hydraulic damper, connection and control are complicated, reliability is lower, on using, have certain narrow limitation.
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, supplies power and carry out the damping adjusting; The mechanical energy that promptly will vibrate main body through the coupling of piezoelectric stack and hydraulic fluid converts electric energy to; The voltage signal that is generated is (function of sensor) except that directly being used to the vibrational state testing signal, after conversion treatment, also is used to the status adjustment of orifice valve.
The technological scheme that the present invention takes is, hydraulic cylinder is installed on the main body through screw, and said main body is installed on the base through screw; Said hydraulic cylinder piston is installed on cylinder interior and said cylinder body is separated into cylinder body epicoele and cylinder body cavity of resorption, and said cylinder body epicoele is communicated with one group of pipeline on the said main body through pipe joint, and another on said cylinder body cavity of resorption and the main body organized pipeline and be communicated with; Two groups of pipelines on the said main body respectively with the damping regulating spool on annular groove be communicated with; One group of pipeline on the said main body also links to each other with accumulator; Two groups of pipelines on the said main body also communicate with the fluid chamber of two groups of electricity generating devices respectively, and described electricity generating device is connected with ECU through lead respectively with the damping modulating valve.
Electricity generating device according to the invention is made up of with piezoelectric stack the fluid chamber that places body interior, butterfly spring one, generating chamber piston and generating, and said butterfly spring one, generating chamber piston, generating are crimped in the main body through base with piezoelectric stack;
Damping modulating valve according to the invention is made up of with piezoelectric stack spool, butterfly spring two and driving, and said spool, butterfly spring two, driving are crimped in the integrated package through base with piezoelectric stack, and said spool is provided with circular groove.
ECU according to the 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, and generating is with piezoelectric stack preloading power, and the piezoelectric stack of valve control does not receive the external force effect and makes spool be in normally open.After getting into steady operation, moving up and down of hydraulic cylinder piston changes system fluid pressure (the piezoelectric stack stress is used in two groups of generatings), thereby can convert the pressure of fluid to electric energy.The electric energy that is generated is through further being used to control the damping modulating valve after the conversion treatment, and the motion state of damping modulating valve is confirmed by the size and the waveform of institute's formation voltage.
The invention has the advantages that:
need not extraneous energy supply, reliability height, can not influence 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 the vibration situation;
is simple in structure, volume is little, level of integration is high, good airproof performance, need not peripheral unit such as motor, pump, solenoid valve;
do not produce/do not receive electromagnetic interference, more is applicable to the environment of high magnetic fields, intense radiation.Therefore, piezoelectric stack formula self energizing adjustable hydraulic damper of the present invention also is suitable for microsystem and 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 the structure and the generalized section thereof of a preferred embodiment of the present invention;
Fig. 2 is the A-A sectional view of preferred embodiment Fig. 1 of the present invention;
Fig. 3 (a) is that preferred embodiment generating of the present invention is with piezoelectric stack 5a3 output voltage waveform;
Fig. 3 (b) is that preferred embodiment generating of the present invention is with piezoelectric stack 5b3 output voltage waveform;
Fig. 3 (c) is the generating voltage oscillogram after preferred embodiment rectification of the present invention;
Fig. 3 (d) is that 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 damping of the present invention spool 62;
Fig. 4 (a) is the preceding damping valve opening aperture figure of power supply in preferred embodiment of the present invention;
Fig. 4 (b) is power supply back damping valve opening aperture figure in preferred embodiment of the present invention;
Fig. 5 is the ECU circuit theory diagrams of a preferred embodiment of the present invention.
Embodiment
Electricity generating device according to the invention is made up of with piezoelectric stack the fluid chamber that places body interior, butterfly spring one, generating chamber piston and generating, and said butterfly spring, generating chamber piston, generating are crimped in the main body through base with piezoelectric stack;
Damping modulating valve according to the invention is made up of with piezoelectric stack spool, butterfly spring and driving, and said spool, butterfly spring, driving are crimped in the main body through base with piezoelectric stack, and said spool is provided with circular groove.
ECU according to the 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.
Like Fig. 1, shown in Figure 2, constitute by hydraulic cylinder 1, hydraulic cylinder piston 2, pipe joint 3, main body 4, base 7, ECU 8, accumulator 9 that electricity generating device 5a and electricity generating device 5b and damping modulating valve 6 be installed; Said electricity generating device 5a is by placing main body 4 inner butterfly spring one 5a1, generating chamber piston 5a2 and generatings to constitute with piezoelectric stack 5a3 and fluid chamber 5a4; Said electricity generating device 5b is by placing main body 4 inner butterfly spring 5b1, generating chamber piston 5b2 and generatings to constitute with piezoelectric stack 5b3 and fluid chamber 5b4; Said damping modulating valve 6 is made up of with piezoelectric stack 63 butterfly spring 2 61, spool 62 and driving; Said cylinder body 1 is installed on the main body 4 through screw, and said main body 4 is installed on the base 7 through screw; Said piston 2 is installed on cylinder body 1 inside and said cylinder body 1 is separated into cylinder body epicoele C1 and cylinder body cavity of resorption C2; Said cylinder body epicoele C1 is communicated with pipeline 42a and 41a on the said main body 4 through pipe joint 3, said cylinder body cavity of resorption C2 successively with main body 4 on pipeline 40,41b, 42b and accumulator 9 be communicated with; Said pipeline 42a and 42b respectively with spool 62 on annular groove be communicated with; Butterfly spring one 5a1 of said electricity generating device 5a, piston 5a2, generating are crimped in the main body 4 through base 7 with piezoelectric stack 5a3; Butterfly spring one 5b1 of said electricity generating device 5b, piston 5b2, generating are crimped in the main body 4 through base 7 with piezoelectric stack 5b3; The butterfly spring 2 61 of said damping modulating valve 6, spool 62, driving are crimped in the main body 4 through base 7 with piezoelectric stack 63; Described invention electricity is connected with ECU 8 through lead respectively with 63 with piezoelectric stack 5a3,5b3 and 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, is the set pressure of accumulator 9, and invention is with piezoelectric stack 5a3 and 5b3 preloading power; Drive and do not receive fluid pressure action with piezoelectric stack 63, spool 62 is in normally open.After damper regulator got into 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 can convert the pressure of fluid to electric energy.Said generating flows to ECU 8 with the electric energy that piezoelectric stack 5a3 and 5b3 generate through lead; Again through further flowing to driving with 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.
Like Fig. 1, shown in Figure 2; When steady operation; When hydraulic cylinder piston 2 is moved upward by the external force effect; Hydrodynamic pressure in the cylinder body epicoele C1 raises, the hydrodynamic pressure of cylinder body cavity of resorption C2 reduces, pipeline 42a, fluid chamber 5a4 and pipeline 41a that the liquid in the cylinder body epicoele C1 gets on the main body 4 through pipe joint 3, and pipeline 42b gets into 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 gets into 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 with piezoelectric stack 5a3 be compressed, piezoelectric stack 5b3 the effect of self elastic force down answer be out of shape, the voltage waveform that it generated 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 place 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 powers on, and extend the back, 62 motions of promotion spool, thereby effective flow area of said valve is reduced, and plays the effect that increases damping; The contrast that forward and backward spool 62 damping hole apertures change that powers on of said piezoelectric stack 63 is 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 directly reflected the vibration situation of hydraulic piston 1 (promptly vibrating main body), and therefore generating also has the function of vibration detecting sensor with piezoelectric stack 5a3 or 5b3.Increasing damping with vibration main body (piston 2) when leaving the equilibrium position is purpose; The control principle of ECU 8 of the present invention is as shown in Figure 5, 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 constitute.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 the employing parallel way connection when being a plurality of of said piezoelectric stack.Through rectifier bridge 81 and rectifier bridge 85 rectifications, the voltage waveform after the rectification is identical, shown in Fig. 3 (c) respectively for the voltage that electricity generating device 5a and 5b produce.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; Generate electricity with piezoelectric stack 5a3,5b3 and driving with piezoelectric stack 63 parallel connections; The voltage
that said generating produces with piezoelectric stack 5a3,5b3 is applied directly to and drives with piezoelectric stack 63 two ends (
), moves on the spool 62 and makes that the damping hole flow area reduces, the damping increase; As
when reaching extreme value; Power switch k1 breaks off, discharge switch k2 connects; Drive with piezoelectric stack 63 voltage
and reduce to zero; Said driving is shortened (restore nature length) with piezoelectric stack 63 under the effect of self elastic force, spool 62 moves down under the butterfly spring effect and makes that the damping hole aperture increases, deattenuation; Simultaneously;
reduces rapidly; Power switch k1 connected when
reduced to for zero (being equivalent to original state), discharge switch k2 breaks off, and drove with power on once more elongation and make the damping increase of piezoelectric stack 63; According to generating with the variation of piezoelectric stack voltage waveform, alternately connecting and disconnecting of switch k1 and k2, thus realized the automatic regulatory function of damping.Drive displacement diagram with the power supply voltage of piezoelectric stack 63 and spool 62 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 piezoelectric stack formula self energizing adjustable hydraulic damper is characterized in that hydraulic cylinder is installed on the main body through screw, and said main body is installed on the base through screw; Said hydraulic cylinder piston is installed on cylinder interior and said cylinder body is separated into cylinder body epicoele and cylinder body cavity of resorption, and said cylinder body epicoele is communicated with one group of pipeline on the said main body through pipe joint, and another on said cylinder body cavity of resorption and the main body organized pipeline and be communicated with; Two groups of pipelines on the said main body respectively with the damping regulating spool on annular groove be communicated with; One group of pipeline on the said main body also links to each other with accumulator; Two groups of pipelines on the said main body also communicate with the fluid chamber of two groups of electricity generating devices respectively, and described electricity generating device is connected with ECU through lead respectively with orifice valve.
2. piezoelectric stack formula self energizing adjustable hydraulic damper according to claim 1 is characterized in that, said electricity generating device is made up of with piezoelectric stack the fluid chamber that places body interior, butterfly spring one, generating chamber piston and generating; Said butterfly spring one, generating chamber piston, generating are crimped in the main body through base with piezoelectric stack.
3. piezoelectric stack formula self energizing adjustable hydraulic damper according to claim 1; It is characterized in that; Said damping modulating valve is made up of with piezoelectric stack spool, butterfly spring two and driving; Said spool, butterfly spring two, driving are crimped in the main body through base with piezoelectric stack, and said spool is provided with circular groove.
4. piezoelectric stack formula self energizing adjustable hydraulic damper according to claim 1 is characterized in that, said ECU comprises rectifier bridge, cymoscope, comparator, reaches one group of control switch, is used to carry out the control of energy recovery conversion and 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 true CN102359533A (en) | 2012-02-22 |
| CN102359533B CN102359533B (en) | 2013-01-02 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102979851A (en) * | 2012-12-13 | 2013-03-20 | 浙江师范大学 | Wafer-type piezoelectric hydraulic damper based on curve surface spacing |
| CN102979849A (en) * | 2012-12-13 | 2013-03-20 | 浙江师范大学 | Active-type piezoelectric hydraulic damper |
| CN103016597A (en) * | 2012-12-13 | 2013-04-03 | 浙江师范大学 | Self-powered damper based on vibration energy recovery |
| CN103016599A (en) * | 2012-12-13 | 2013-04-03 | 浙江师范大学 | Integrated type self-powered hydraulic damper |
| CN103267081A (en) * | 2013-05-10 | 2013-08-28 | 河南理工大学 | Piezoelectric power generation type damping-adjustable hydro-pneumatic suspension |
| WO2014018087A1 (en) * | 2012-07-26 | 2014-01-30 | Cw Aerotech Services | Inertial terrain transit event manager apparatus |
| CN105275919A (en) * | 2015-11-30 | 2016-01-27 | 长春工业大学 | External power generating air cylinder for cymbal type piezoelectric element |
| CN107345551A (en) * | 2017-08-17 | 2017-11-14 | 浙江师范大学 | A kind of self-powered damping device |
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 |
-
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 |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014018087A1 (en) * | 2012-07-26 | 2014-01-30 | Cw Aerotech Services | Inertial terrain transit event manager apparatus |
| CN102979851B (en) * | 2012-12-13 | 2014-09-17 | 浙江师范大学 | Wafer-type piezoelectric hydraulic damper based on curve surface spacing |
| CN103016597A (en) * | 2012-12-13 | 2013-04-03 | 浙江师范大学 | Self-powered damper based on vibration energy recovery |
| CN103016599A (en) * | 2012-12-13 | 2013-04-03 | 浙江师范大学 | Integrated type self-powered hydraulic damper |
| CN102979849A (en) * | 2012-12-13 | 2013-03-20 | 浙江师范大学 | Active-type piezoelectric hydraulic damper |
| CN102979851A (en) * | 2012-12-13 | 2013-03-20 | 浙江师范大学 | Wafer-type piezoelectric hydraulic damper based on curve surface spacing |
| CN103016599B (en) * | 2012-12-13 | 2014-10-15 | 浙江师范大学 | Integrated type self-powered hydraulic damper |
| CN103267081A (en) * | 2013-05-10 | 2013-08-28 | 河南理工大学 | Piezoelectric power generation type damping-adjustable hydro-pneumatic suspension |
| 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 |
| CN105275919A (en) * | 2015-11-30 | 2016-01-27 | 长春工业大学 | External power generating air cylinder for cymbal type piezoelectric element |
| CN105275919B (en) * | 2015-11-30 | 2017-08-22 | 长春工业大学 | Cymbal type piezoelectric element external generating cylinder |
| CN107345551A (en) * | 2017-08-17 | 2017-11-14 | 浙江师范大学 | A kind of self-powered damping device |
| CN107345551B (en) * | 2017-08-17 | 2023-01-31 | 浙江师范大学 | Self-supply damper |
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