CN107508488A - Ship Vibration based on friction nanometer power generator can gather and intelligent monitoring device - Google Patents
Ship Vibration based on friction nanometer power generator can gather and intelligent monitoring device Download PDFInfo
- Publication number
- CN107508488A CN107508488A CN201710822029.1A CN201710822029A CN107508488A CN 107508488 A CN107508488 A CN 107508488A CN 201710822029 A CN201710822029 A CN 201710822029A CN 107508488 A CN107508488 A CN 107508488A
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- Prior art keywords
- silica gel
- power generator
- friction nanometer
- nanometer power
- ship
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000000741 silica gel Substances 0.000 claims abstract description 36
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 36
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000004146 energy storage Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000000428 dust Substances 0.000 claims description 2
- 230000008054 signal transmission Effects 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 238000007689 inspection Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract 1
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 4
- 238000007726 management method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/04—Friction generators
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/048—Monitoring; Safety
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
It can be gathered the invention discloses a kind of Ship Vibration based on friction nanometer power generator and intelligent monitoring device, including base, friction nanometer power generator, integrated circuit and display screen；The friction nanometer power generator includes spring, silica gel model, upper electrode, lower electrode and wire, has triboelectricity and vibration signal is converted into the dual-use function of electric signal.The present invention does not need battery and additional power source, and continual can be powered for self-sensor device, and the present invention can be operated with small electric energy, has both reduced resource and energy that manufacture battery is consumed, and can minimization waste, has realized self energizing.The present invention can be according to the output voltage waveforms of generator, calculate the frequency and amplitude of Ship Vibration, it is contrasted with the vibration frequency under ship normal operating condition, monitor abnormal vibrations, be advantageous to ship-handling personnel and maintenance and inspection timely are carried out to the electromechanical equipment of ship abnormal vibrations, realize that Ship Vibration visualizes.
Description
Technical field
The present invention relates to the intelligent monitoring device of ship, particularly a kind of intelligent monitoring device with self energizing.
Technical background
With the development of ship, the modernization in extra large work field and automation, the field needs increasing intelligence to pass
Sensor, many intelligence sensors need to gather multiple nodes, and carry out data storage and analysis, and existing sensing at present
Device can only be operated by the form of additional power source, can not solve the problems, such as the self energizing of sensor.
The content of the invention
To solve above-mentioned technical problem, the present invention to design it is a kind of with self energizing based on friction nanometer generating
The Ship Vibration of machine can gather and intelligent monitoring device.
To achieve these goals, technical scheme is as follows：Ship Vibration energy based on friction nanometer power generator
Collection and intelligent monitoring device, including base, friction nanometer power generator, integrated circuit and display screen；Described friction nanometer
Generator is fixed on base, and described integrated circuit is arranged in base, and described display screen is arranged on the side of base, institute
The base stated is fixed on ship；
The friction nanometer power generator includes spring, silica gel model, upper electrode, lower electrode and wire；The silica gel
Model is spin model；The spring is located inside silica gel model, spring and silica gel model it is spiral-shaped consistent；The upper strata
Electrode is located at the uper side surface of silica gel model helicoid, and the lower electrode is located at the downside surface of silica gel model helicoid, institute
The upper surface for stating lower electrode sets layer of silica gel；The upper electrode and lower electrode are connected by wire and integrated circuit respectively
Connect；The friction nanometer power generator has triboelectricity and vibration signal is converted into the dual-use function of electric signal；
The integrated circuit includes Circuit management module and energy-storage module；Described Circuit management module include single-chip microcomputer,
Electric capacity A, electric capacity B, inductance A and zero-crossing comparator, described friction nanometer power generator respectively with electric capacity A, electric capacity B and rectifier
Two input interface parallel connections；The both ends of described electric capacity A and electric capacity B same one end respectively with inductance A are connected；Described zero passage ratio
Two inputs compared with device are connected respectively to electric capacity B both ends, the signal input of the output end connection single-chip microcomputer of zero-crossing comparator
End；Described energy-storage module include rectifier, voltage comparator, FET, diode, inductance B, voltage-stablizer, single-chip microcomputer and
Capacitor C；Two input interfaces of described rectifier are connected with Circuit management module, two output interfaces and the electricity of rectifier
Press comparator in parallel；Described voltage comparator is in parallel with diode, capacitor C respectively；Described FET respectively with electricity
The positive input terminal of comparator, output end is pressed to be connected with the negative electrode of diode；Described inductance B one end respectively with FET and
Diode connects, and the inductance B other end is connected with capacitor C and voltage-stablizer one end；The other end of described voltage-stablizer is through list
Energy-storage module is connected back to after piece machine, forms supply line；
The output end of described single-chip microcomputer is connected with display screen.
Further, the output end of described single-chip microcomputer is connected with wireless communication module, and single-chip microcomputer passes through radio communication mold
Electric signal transmission to information is received center by block.
Further, spin model is made by pouring type in the silica gel model and spring, and spring is used to support silica gel
Model and the elasticity for ensureing silica gel model.
Further, the upper electrode and lower electrode are mixed by silica gel with carbon dust is plated in silica gel model helicoid
Upper and lower surface；The layer of silica gel is as insulation frictional layer.
Further, the capacitor C connects with contactor.
The operation principle of the present invention is as follows：At work, because Ship Vibration makes the spring of friction nanometer power generator do week
Phase property compression motion so that upper electrode and lower electrode do periodic contact-disengaging movement, and layer of silica gel makees the cycle with electrode layer
Property contact friction so that the friction net charge that electrode layer surface is carried moves with it, promote upper electrode and lower floor electricity
Induced electricity potential difference generating period change between pole, the outside circuit output ac signal of driving electrodes.
Rectifier is that the alternating current for sending friction nanometer power generator is processed into DC current, is easy to energy-storage module to store up
Deposit.
The present invention judges the situation of vibration using voltage, electric current and the frequency signal of exchange caused by Ship Vibration, together
When collect the alternating current, be translated into direct current storage, so as to single-chip microcomputer and monitor power supply.
The friction nanometer power generator of the present invention is developed by plate contact, shape in spring form, belongs to contact separation formula
Friction nanometer power generator.The silica gel model of friction nanometer power generator by moulding by casting, its internal spring play support and
Ensure the effect of friction nanometer power generator elasticity.
The present invention pastes one layer of layer of silica gel on lower electrode, as insulation friction film.
Compared with prior art, the invention has the advantages that：
1st, the present invention does not need battery and additional power source, and continual can be powered for self-sensor device, this hair
It is bright to be operated with small electric energy, both reduce resource and energy that manufacture battery is consumed, and can reduces electric power wave
Take, realize self energizing.
2nd, the present invention according to the output voltage waveforms of generator, can calculate the frequency and amplitude and ship of Ship Vibration
The vibration frequency of other electromechanical equipments of oceangoing ship cabin, and can be transmitted by Internet of Things and store monitoring information, it is normal with ship
Vibration frequency under running status is contrasted, once there are any abnormal vibrations, it will warning system is transmitted to, is advantageous to ship
Administrative staff timely carry out maintenance and inspection to the electromechanical equipment of ship abnormal vibrations, realize that Ship Vibration visualizes.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the silica gel model structure chart of the present invention.
Fig. 3 is the silica gel model contained spring structure chart of the present invention.
Fig. 4 is friction nanometer power generator operation principle schematic diagram.
Fig. 5 is the working circuit diagram of the present invention.
In figure：1- silica gel models；2- springs；3- upper electrodes；4- layer of silica gel；5- lower electrodes；6- bases；7- is shown
Device；8- friction nanometer power generators；9- capacitors A；10- inductance A；11- electric capacity B；12- zero-crossing comparators；13- rectifiers；14- fields
Effect pipe；15- voltage comparators；16- diodes；17- inductance B；18- capacitors C；19- contactors；20- voltage-stablizers；21st, it is single
Piece machine；22nd, display screen.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with accompanying drawing, the present invention is entered
Row is further described.
It is as Figure 1-3 the structural representation of the present invention, the present invention is positioned on ship or ship machinery, bottom is solid
It is fixed.Fig. 4 is the operation principle schematic diagram of the present invention, when ship or Ship Vibration, due to the spy of contained spring 2 and elastic silica gel
Property, the present invention can do periodic compression motion.Upon compression, upper electrode 3 is in contact with the layer of silica gel 4 on lower electrode 5
Friction, lower electrode 5 is negatively charged, and upper electrode 3 is positively charged, and both amount of charge are equal；During due to Separation by vibration, up and down
Two separate, while lower electrode 5 can induce positive charge, electronics is transferred to upper electrode 3 by external circuit；Spring 2 is again
During compression, the electrons on upper electrode 3 transfer to lower electrode 5 by external circuit, circulate successively.Spring 2 is doing the cycle
Ambient vibration just can be converted into electric energy in compression motion process.
The present invention is used as self-driven vibrating sensor, and directly output is the electric signal of high voltage, low current, therefore, adding
Circuit management module.As shown in figure 5, the electric signal that friction nanometer power generator 8 exports is sent to voltage ratio by rectifier 13
Compared with device 15, when voltage is higher than preset value, the switch closure of FET 14, charged for capacitor C18.Capacitor C18 is through voltage stabilizing
The voltage stabilizing of device 20 is exported, and electric energy is provided for load (voltage comparator 15, zero-crossing comparator 12, single-chip microcomputer 21 and display 22).
Ambient vibration is converted into periodic electrical signal by the present invention, can be converted into the signal frequency of input in chip and be shaken
Dynamic signal.The output signal of friction nanometer power generator 8 is converted into electric signal by zero-crossing comparator 12 and single-chip microcomputer 21 in circuit, i.e.
By experiment, demarcation signal frequency and vibration frequency relation, and voltage swing and Oscillation Amplitude relation, it is sintered in core
In piece, you can convert electrical signals to vibration signal, finally send display 22 to and information receives center.
The present invention in addition to it can be power itself, can also be radio temperature sensor, wireless humidity sensor etc. its
He powers at wireless senser, forms wireless sensing network system.
The present invention is not limited to the present embodiment, any equivalent concepts in the technical scope of present disclosure or changes
Become, be classified as protection scope of the present invention.
Claims (5)
1. the Ship Vibration based on friction nanometer power generator can gather and intelligent monitoring device, it is characterised in that：Including base
(6), friction nanometer power generator (8), integrated circuit and display screen (22)；Described friction nanometer power generator (8) is fixed on bottom
On seat (6), described integrated circuit is arranged in base (6), and described display screen (22) is arranged on the side of base (6), institute
The base (6) stated is fixed on ship；
The friction nanometer power generator (8) includes spring (2), silica gel model (1), upper electrode (3), lower electrode (5) and led
Line；The silica gel model (1) is spin model；The spring (2) is located at silica gel model (1) inside, spring (2) and silica gel model
(1) spiral-shaped consistent；The upper electrode (3) is located at the uper side surface of silica gel model (1) helicoid, the lower electrode
(5) it is located at the downside surface of silica gel model (1) helicoid, the upper surface of the lower electrode (5) sets layer of silica gel (4)；It is described
Upper electrode (3) and lower electrode (5) are connected by wire with integrated circuit respectively；The friction nanometer power generator (8) has
Triboelectricity and the dual-use function that vibration signal is converted into electric signal；
The integrated circuit includes Circuit management module and energy-storage module；Described Circuit management module include single-chip microcomputer (21),
Electric capacity A (9), electric capacity B (11), inductance A (10) and zero-crossing comparator (12), described friction nanometer power generator (8) respectively with electricity
Hold two input interface parallel connections of A (9), electric capacity B (11) and rectifier (13)；Described electric capacity A's (9) and electric capacity B (11) is same
Both ends of the one end respectively with inductance A (10) are connected；Two inputs of described zero-crossing comparator (12) are connected respectively to electric capacity B
(11) both ends, the signal input part of the output end connection single-chip microcomputer (21) of zero-crossing comparator (12)；Described energy-storage module bag
Include rectifier (13), voltage comparator (15), FET (14), diode (16), inductance B (17), voltage-stablizer (20), monolithic
Machine (21) and capacitor C (18)；Two input interfaces of described rectifier (13) are connected with Circuit management module, rectifier
(13) two output interfaces are in parallel with voltage comparator (15)；Described voltage comparator (15) respectively with diode (16),
Capacitor C (18) is in parallel；Described FET (14) positive input terminal with voltage comparator (15), output end and two poles respectively
Manage the negative electrode connection of (16)；Described inductance B (17) one end is connected with FET (14) and diode (16) respectively, inductance
B (17) other end is connected with capacitor C (18) and voltage-stablizer (20) one end；The other end of described voltage-stablizer (20) is through list
Energy-storage module is connected back to after piece machine (21), forms supply line；
The output end of described single-chip microcomputer (21) is connected with display screen (22).
2. the Ship Vibration according to claim 1 based on friction nanometer power generator can gather and intelligent monitoring device, its
It is characterised by：The output end of described single-chip microcomputer (21) is connected with wireless communication module, and single-chip microcomputer (21) passes through radio communication mold
Electric signal transmission to information is received center by block.
3. the Ship Vibration according to claim 1 based on friction nanometer power generator can gather and intelligent monitoring device, its
It is characterised by：Spin model is made by pouring type in the silica gel model (1) and spring (2), and spring (2) is used to support silica gel
Model (1) simultaneously ensures the elasticity of silica gel model (1).
4. the Ship Vibration according to claim 1 based on friction nanometer power generator can gather and intelligent monitoring device, its
It is characterised by：The upper electrode (3) and lower electrode (5) are mixed by silica gel with carbon dust is plated in silica gel model (1) helicoid
Upper and lower surface；The layer of silica gel (4) is as insulation frictional layer.
5. the Ship Vibration according to claim 1 based on friction nanometer power generator can gather and intelligent monitoring device, its
It is characterised by：The capacitor C (18) is connected with contactor (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710822029.1A CN107508488B (en) | 2017-09-13 | 2017-09-13 | Ship vibration energy acquisition and intelligent monitoring device based on friction nano generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710822029.1A CN107508488B (en) | 2017-09-13 | 2017-09-13 | Ship vibration energy acquisition and intelligent monitoring device based on friction nano generator |
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| Publication Number | Publication Date |
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| CN107508488A true CN107508488A (en) | 2017-12-22 |
| CN107508488B CN107508488B (en) | 2023-11-28 |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018205994A1 (en) * | 2017-05-12 | 2018-11-15 | 北京纳米能源与***研究所 | Power supply management module, management method and energy system for triboelectric nanogenerator |
| CN109470354A (en) * | 2018-11-16 | 2019-03-15 | 大连海事大学 | From driving Ship Vibration monitoring and fault diagnosis system |
| CN109946200A (en) * | 2019-03-15 | 2019-06-28 | 中国地质大学（武汉） | A kind of contact separation formula coal bed gas two phase flow air bubble sensor based on nano material |
| CN110454145A (en) * | 2019-07-12 | 2019-11-15 | 中国地质大学（武汉） | Geological drilling bottom hole multi frequency sensor based on friction nanometer power generator |
| CN110492777A (en) * | 2019-08-30 | 2019-11-22 | 河南师范大学 | A kind of helical form triboelectricity device based on 3D printing technique production |
| CN110488345A (en) * | 2019-08-23 | 2019-11-22 | 大连民族大学 | Seismic test device based on triboelectricity |
| CN111312201A (en) * | 2019-05-31 | 2020-06-19 | 北京纳米能源与***研究所 | Self-driven electronic organ based on friction nano generator and manufacturing method thereof |
| CN111327225A (en) * | 2020-03-11 | 2020-06-23 | 电子科技大学 | Integrated self-powered sensor of barbell type friction nano generator and preparation method thereof |
| CN111396236A (en) * | 2020-04-05 | 2020-07-10 | 西北工业大学 | Tumbler type wave energy power generation device based on double helix unit |
| CN111579052A (en) * | 2020-05-21 | 2020-08-25 | 大连海事大学 | Marine vibration monitoring and early warning device |
| CN112202358A (en) * | 2020-10-12 | 2021-01-08 | 大连海事大学 | Self-powered unit and dust collector based on rain energy and wind energy |
| CN113162456A (en) * | 2021-04-19 | 2021-07-23 | 北京纳米能源与***研究所 | Friction nanometer generator, vibration frequency monitoring system and vibration frequency monitoring method |
| CN113189433A (en) * | 2021-05-28 | 2021-07-30 | 南京邮电大学 | Novel ceramic energy storage performance detection device with self-energy supply function |
| CN113346789A (en) * | 2021-06-10 | 2021-09-03 | 大连海事大学 | Embedded while-drilling power generation device |
| CN113375716A (en) * | 2021-06-01 | 2021-09-10 | 国网重庆市电力公司电力科学研究院 | Self-powered power transmission line on-line monitoring system based on multi-sensor data fusion |
| CN113872463A (en) * | 2021-11-02 | 2021-12-31 | 国网四川省电力公司电力科学研究院 | Vibration energy self-driving system for overhead transmission line |
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| CN116576953A (en) * | 2023-07-11 | 2023-08-11 | 吉林大学 | 4D printing self-powered vibration sensor for planetary sampling |
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Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018205994A1 (en) * | 2017-05-12 | 2018-11-15 | 北京纳米能源与***研究所 | Power supply management module, management method and energy system for triboelectric nanogenerator |
| US11394318B2 (en) | 2017-05-12 | 2022-07-19 | Beijing Institute Of Nanoenergy And Nanosystems | Power management circuit and power management method for triboelectric nanogenerator, and energy system |
| CN109470354B (en) * | 2018-11-16 | 2021-03-19 | 大连海事大学 | Self-driven ship vibration monitoring and fault diagnosis system |
| CN109470354A (en) * | 2018-11-16 | 2019-03-15 | 大连海事大学 | From driving Ship Vibration monitoring and fault diagnosis system |
| CN109946200A (en) * | 2019-03-15 | 2019-06-28 | 中国地质大学（武汉） | A kind of contact separation formula coal bed gas two phase flow air bubble sensor based on nano material |
| CN109946200B (en) * | 2019-03-15 | 2024-05-10 | 中国地质大学（武汉） | Contact separation type coalbed methane two-phase flow bubble sensor based on nano material |
| CN111312201A (en) * | 2019-05-31 | 2020-06-19 | 北京纳米能源与***研究所 | Self-driven electronic organ based on friction nano generator and manufacturing method thereof |
| CN111312201B (en) * | 2019-05-31 | 2023-06-02 | 北京纳米能源与***研究所 | Self-driven electronic organ based on friction nano generator and manufacturing method thereof |
| CN110454145A (en) * | 2019-07-12 | 2019-11-15 | 中国地质大学（武汉） | Geological drilling bottom hole multi frequency sensor based on friction nanometer power generator |
| CN110488345A (en) * | 2019-08-23 | 2019-11-22 | 大连民族大学 | Seismic test device based on triboelectricity |
| CN110492777A (en) * | 2019-08-30 | 2019-11-22 | 河南师范大学 | A kind of helical form triboelectricity device based on 3D printing technique production |
| CN111327225B (en) * | 2020-03-11 | 2023-05-26 | 电子科技大学 | Barbell type friction nano generator integrated self-powered sensor and preparation method thereof |
| CN111327225A (en) * | 2020-03-11 | 2020-06-23 | 电子科技大学 | Integrated self-powered sensor of barbell type friction nano generator and preparation method thereof |
| CN111396236B (en) * | 2020-04-05 | 2021-08-10 | 西北工业大学 | Tumbler type wave energy power generation device based on double helix unit |
| CN111396236A (en) * | 2020-04-05 | 2020-07-10 | 西北工业大学 | Tumbler type wave energy power generation device based on double helix unit |
| CN111579052A (en) * | 2020-05-21 | 2020-08-25 | 大连海事大学 | Marine vibration monitoring and early warning device |
| CN112202358A (en) * | 2020-10-12 | 2021-01-08 | 大连海事大学 | Self-powered unit and dust collector based on rain energy and wind energy |
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