CN116914403B - High-stability broadcast television antenna - Google Patents
High-stability broadcast television antenna Download PDFInfo
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- CN116914403B CN116914403B CN202310875555.XA CN202310875555A CN116914403B CN 116914403 B CN116914403 B CN 116914403B CN 202310875555 A CN202310875555 A CN 202310875555A CN 116914403 B CN116914403 B CN 116914403B
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- 238000013016 damping Methods 0.000 claims abstract description 56
- 239000012530 fluid Substances 0.000 claims abstract description 52
- 230000001629 suppression Effects 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 238000000926 separation method Methods 0.000 claims abstract description 19
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910001105 martensitic stainless steel Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 24
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract description 3
- 230000035939 shock Effects 0.000 abstract description 3
- 230000001133 acceleration Effects 0.000 description 17
- 238000012360 testing method Methods 0.000 description 17
- 230000009467 reduction Effects 0.000 description 11
- 238000004088 simulation Methods 0.000 description 10
- 230000006872 improvement Effects 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 5
- 230000008719 thickening Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011553 magnetic fluid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
- E04H12/08—Structures made of specified materials of metal
- E04H12/10—Truss-like structures
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
- F16F15/027—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means comprising control arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention relates to a high-stability broadcast television antenna which comprises an antenna body, wherein a magneto-rheological liquid damper is arranged between the lower part of the antenna body and the top of a television transmitting tower. The magnetorheological fluid damper comprises a circular annular shell, wherein a separation layer is arranged in the annular shell, an inner cavity of the annular shell is divided into an upper vibration suppression cavity and a lower vibration suppression cavity by the separation layer, a first spiral spring roll is arranged in the upper vibration suppression cavity, a second spiral spring roll is arranged in the lower vibration suppression cavity, and damping fluid is filled in the upper vibration suppression cavity and the lower vibration suppression cavity. By adding the magneto-rheological liquid damper, the magneto-rheological liquid damper has the functions of shock prevention, absorption and consumption of impact force, and the influence on the launching tower is minimized when the launching tower is impacted by strong wind or even earthquake. The magnetorheological fluid damper is small in size and weight, the damping effect can be adjusted according to the external wind power, the electric energy consumption is saved to the maximum extent, and the practicability is high.
Description
Technical Field
The invention relates to a high-stability broadcast television antenna, and belongs to the technical field of broadcast televisions.
Background
Currently, in the field of television broadcasting, broadcast television antennas are usually installed on top of a transmitting tower. As an important high-rise structure, the steel structure broadcast television transmitting tower has the characteristics of high flexibility, and large internal force and deformation under the action of wind load, if the design or construction is insufficient, collapse accidents under the wind load can be caused, and casualties and economic losses are brought. The height of the launching tower is usually tens to hundreds of meters, and the tower type is three types of triangular steel towers, quadrangular steel pipe towers and hexagonal steel pipe towers.
Because the radio and television antenna is arranged higher, when the weather of strong wind is met, the swing amplitude of the wind force acting on the top end of the radio and television antenna is larger, and if the wind force is larger, instability and the like are easy to occur. In addition, with the popularization of technologies such as 5G, the broadcast television antenna has more and more dense and precise internal electronic components, and the service life of the internal electronic components is affected by vibration generated by excessive swing. Therefore, the damper is usually installed at the top of the launching tower (or the top of a high-rise building) above 50 m from the ground, so that a steel pipe or steel plate with higher mechanical strength can be used for manufacturing the tower body, the damper has the functions of shock prevention, absorption and impact consumption, and the influence on the launching tower is minimized when the launching tower is impacted by strong wind or even earthquake.
However, taking a liquid damper as an example, for example, "an annular liquid damper" disclosed in publication No. CN218597411U, which is an annular liquid damper commonly used in the industry, the damping liquid in the annular liquid damper is water, and the damping liquid is usually used at the top of a chimney above 60 meters, and the annular liquid damper has the advantage of simple structure. However, the disadvantage is that the volume is large, for example 60 meters, and the total volume is 13.5m 3 The damping fluid is not less than 10m 3 . The volume and the weight are large, and the device is not suitable for being arranged at the top of a transmitting tower of a broadcast television.
Based on this, the present invention has been proposed.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a high-stability broadcast television antenna, which comprises the following specific technical scheme:
a high-stability broadcast television antenna comprises an antenna body, wherein the antenna body is arranged at the top of a television transmitting tower, and a magneto-rheological liquid damper is arranged between the lower part of the antenna body and the top of the television transmitting tower.
Still further improvement, the magnetorheological fluid damper comprises a circular annular shell, a circular mounting pore canal is arranged in the center of the annular shell, a separation layer is arranged in the annular shell, an inner cavity of the annular shell is divided into an upper vibration suppressing cavity positioned above the separation layer and a lower vibration suppressing cavity positioned below the separation layer by the separation layer, a spiral first elastic sheet roll is arranged in the upper vibration suppressing cavity, a spiral second elastic sheet roll is arranged in the lower vibration suppressing cavity, and the rotation direction of the first elastic sheet roll is opposite to that of the second elastic sheet roll; the upper vibration suppression cavity is communicated with the lower vibration suppression cavity through a gap at the separation layer, and damping liquid is filled in the upper vibration suppression cavity and the lower vibration suppression cavity.
Further improvement, the first elastic sheet roll and the second elastic sheet roll comprise spiral elastic sheet bodies, S-shaped electromagnets are embedded in the side walls of the elastic sheet bodies, the electromagnets are connected with the elastic sheet bodies into a whole, the electromagnets comprise arc-shaped sheet bodies I and arc-shaped sheet bodies II, and the arc-shaped sheet bodies I and II are arranged in a central symmetry mode;
when the elastic sheet body is spread in a horizontal plane, the chord positioned at the outer side of the first arc-shaped sheet body and the chord positioned at the outer side of the second arc-shaped sheet body are collinear, and an included angle between the chord and the length direction of the elastic sheet body is gamma, wherein gamma is more than or equal to 70 degrees and less than or equal to 80 degrees.
Still further improvement, γ=77°.
Still further improvement, the separate layer includes decides the plate, is provided with between two adjacent fixed plates and moves the plate, it is hollow structure to move the plate, it is less than the density of damping fluid to move the density of plate, decide plate and annular shell fixed connection, be provided with the clearance between fixed plate and the movable plate, it is provided with to the circular pit of moving the plate indent to move the surface of plate.
In a further improvement, the annular shell and the fixed plate are both made of aluminum alloy, and the movable plate is made of martensitic or ferritic stainless steel.
Further improvement, the upper portion of antenna body is installed and is used for detecting the displacement sensor of the swing range of antenna body upper portion.
In a further improvement, the damping fluid is prepared by grinding water, gasoline, ferroferric oxide and polypropylene wax according to the mass ratio of 100:72:165:33.
Further improvement, the current connected with the electromagnet is pulsating direct current;
the electromagnets are numbered in sequence, the number of the electromagnet positioned at the head part of the elastic sheet body is 1 st, and the intensity of the magnetic field generated by the 1 st electromagnet is H 1 The method comprises the steps of carrying out a first treatment on the surface of the The number of the electromagnet positioned at the tail part of the elastic sheet body is n, and the strength of the magnetic field generated by the n electromagnet is H n N is an integer greater than 5;
at the same time H i+1 -H i The magnetic field intensity generated by the ith electromagnet is H which is more than or equal to 1.4T i I is more than or equal to 1 and less than or equal to n-1, wherein i is an integer;
at the same time H j+4 ＝H j The magnetic field strength generated by the jth electromagnet is H j And j is more than or equal to 1 and less than or equal to n-4,j, wherein the magnetic field direction of the jth electromagnet is opposite to the magnetic field direction of the (j+4) th electromagnet 32.
The invention has the beneficial effects that:
1. according to the high-stability broadcast television antenna, the magnetorheological liquid damper is additionally arranged, so that the effects of shock prevention, absorption and impact consumption are achieved, the broadcast television antenna and electronic components in the broadcast television antenna are protected, and the influence on the broadcast television antenna is minimized when the broadcast television antenna is impacted by strong wind and even earthquakes.
2. The magneto-rheological liquid damper has small volume and weight, and is particularly suitable for being installed on a broadcasting television antenna. The damping effect can be adjusted according to the external wind power, so that the electric energy consumption is saved to the maximum extent, and the practicability is high.
Drawings
Fig. 1 is a schematic structural diagram of a high-stability broadcast television antenna according to the present invention;
FIG. 2 is an internal schematic view of a magnetorheological fluid damper in accordance with the present invention;
FIG. 3 is a schematic view of the upper vibration suppression chamber of the present invention;
FIG. 4 is a schematic view of the spring plate according to the present invention after being spread in a horizontal plane;
FIG. 5 is a schematic view of the structure of the separator according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it is to be noted that, unless otherwise indicated, the meaning of "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
As shown in fig. 1, the high-stability broadcast television antenna comprises an antenna body 11, wherein the antenna body 11 is arranged at the top of a television transmitting tower 10, and a magneto-rheological liquid damper 20 is arranged between the lower part of the antenna body 11 and the top of the television transmitting tower 10. The television transmitting tower 10 is composed of a plurality of trusses and a trilateral steel plate structure.
As shown in fig. 2 and 3, the magnetorheological fluid damper 20 includes a circular annular shell 21, a circular mounting hole 211 is provided in the center of the annular shell 21, a separation layer 22 is provided in the annular shell 21, an inner cavity of the annular shell 21 is separated by the separation layer 22 into an upper vibration suppression cavity 23 located above the separation layer 22 and a lower vibration suppression cavity 24 located below the separation layer 22, a spiral first elastic sheet roll 25 is provided in the upper vibration suppression cavity 23, a spiral second elastic sheet roll 26 is provided in the lower vibration suppression cavity 24, and the rotation direction of the first elastic sheet roll 25 is opposite to that of the second elastic sheet roll 26; the upper vibration suppression cavity 23 and the lower vibration suppression cavity 24 are communicated through a gap at the separation layer 22, and damping liquid is filled in both the upper vibration suppression cavity 23 and the lower vibration suppression cavity 24.
The first spring roll 25 and the second spring roll 26 each comprise a spiral spring body 31, an S-shaped electromagnet 32 is embedded in the side wall of the spring body 31, the electromagnet 32 and the spring body 31 are connected into a whole, the electromagnet 32 comprises an arc-shaped sheet body I321 and an arc-shaped sheet body II 322, and the arc-shaped sheet body I321 and the arc-shaped sheet body II 322 are arranged in a central symmetry manner;
as shown in fig. 4, after the elastic sheet 31 is spread in a horizontal plane, the chord located at the outer side of the first arc-shaped sheet 321 and the chord located at the outer side of the second arc-shaped sheet 322 are collinear, and an included angle between the chord and the length direction of the elastic sheet 31 is larger than or equal to 70 ° and smaller than or equal to 80 °. The arrangement of gamma can influence the impact effect of the magnetic fluid on the elastic sheet body 31; most preferably, γ=77°.
As shown in fig. 5, the separation layer 22 includes fixed plates 221, a movable plate 222 is disposed between two adjacent fixed plates 221, the movable plate 222 is of a hollow structure, the density of the movable plate 222 is less than that of the damping fluid, the fixed plates 221 are fixedly connected with the annular shell 21, a gap is disposed between the fixed plates 221 and the movable plate 222, and a circular pit 2221 recessed into the movable plate 222 is disposed on the surface of the movable plate 222.
Wherein, in order to prevent interference, the annular shell 21 and the fixed plate 221 are all made of aluminum alloy; the movable plate 222 is made of martensitic or ferritic stainless steel, so that the movable plate 222 can be driven to swing under the adsorption of magnetic force, and therefore, the density of the movable plate 222 needs to be smaller than that of the damping fluid, so that the movable plate 222 can swing between the two fixed plates 221 more freely. The circular pit 2221 is provided such that it has a stronger impact effect per unit area under the impact of the damping fluid.
Further, the current conducted by the electromagnet 32 is pulsating direct current;
the electromagnets 32 are numbered sequentially, the number of the electromagnet 32 positioned at the head part of the bullet body 31 is 1 st, and the intensity of the magnetic field generated by the 1 st electromagnet 32 is H 1 The method comprises the steps of carrying out a first treatment on the surface of the The number of the electromagnet 32 positioned at the tail part of the projectile body 31 is n, and the magnetic field intensity generated by the n electromagnet 32 is H n N is an integer greater than 5;
at the same time H i+1 -H i Not less than 1.4T, the strength of the magnetic field generated by the ith electromagnet 32 is H i I is more than or equal to 1 and less than or equal to n-1, wherein i is an integer; that is, at the same time, the difference in the magnetic field strength generated by two adjacent electromagnets 32 is greater than or equal to 1.4T.
At the same time H j+4 ＝H j The j-th electromagnet 32 generates a magnetic field of strength H j And j is more than or equal to 1 and less than or equal to n-4,j, wherein the magnetic field direction of the jth electromagnet 32 is opposite to the magnetic field direction of the jth electromagnet 32 and the (4) th electromagnet 32. That is, the magnetic field strength generated by each of the three electromagnets 32 is equal but the magnetic fields are opposite. The magnetic field direction is from N to S, specifically, in the present invention, if a permanent magnet is placed in the damping fluid, for example, the 1 st electromagnet 32 can generate a magnetic force that attracts the permanent magnet, and the 5 th electromagnet 32 can generate a magnetic force that repels the permanent magnet.
The common direct current refers to a dry battery, for example, the voltage of which the voltage is high and low and the direction of which the anode and the cathode are not changed in a relative range with time. Pulsating direct current means that the direction is unchanged, but the magnitude is changed with time.
First, the antenna body 11 and the television transmitter tower 10 are severely swung and vibrated in windy weather, and the damping liquid functions as water in the absence of a magnetic field, similar to the existing liquid damper, but only in five-stage winds and below. If the wind level is larger, a pulsating direct current needs to be connected to the electromagnet 32, which generates a magnetic field, the damping fluid is magnetic fluid, after the damping fluid is magnetized, under the action of the magnetic field, the damping fluid firstly flows along a spiral channel (formed by the first elastic sheet roll 25 and the second elastic sheet roll 26) and has the function of increasing the shearing interface area of a fluid passage on a unit volume, then when the first elastic sheet roll 25 and the second elastic sheet roll 26 are impacted, the first elastic sheet roll 25 and the second elastic sheet roll 26 can generate corresponding displacement changes, work and energy are continuously performed, and friction and energy in the damping fluid are added, so that the damping effect of inhibiting vibration is realized.
Secondly, the current connected by the electromagnet 32 is pulsating direct current, the magnetic force changes, so that the impact force of the damping fluid on the first elastic sheet roll 25 and the second elastic sheet roll 26 changes at any time, the damping fluid actively fluctuates in a changing magnetic field, and the first elastic sheet roll 25 and the second elastic sheet roll 26 are driven to continuously and severely displace, so that the energy consumption result is aggravated. If the current on the electromagnet 32 is a normal direct current, the damping fluid is not easy to actively fluctuate in a stable magnetic field, but can shake along with vibration, and the damping effect is obviously weaker.
In addition, the invention can adjust the peak value of the pulsating direct current connected by the electromagnet 32 according to the external wind power. For example, when the wind force is 7 levels, the maximum value of the magnetic field intensity generated by the electromagnet 32 is 3T; when the wind power is 8-level, the maximum value of the magnetic field intensity generated by the electromagnet 32 is 5T. Therefore, the energy is saved to the maximum extent while the damping effect is ensured, and the effect is better.
The invention adopts electromagnetic technology and unique structure inside, so that the damping effect is good; therefore, the total volume of the damper and the amount of damping fluid used can be greatly reduced.
Damping effect simulation test
Reducing the magnetorheological fluid damper 20 according to the proportion of 1:20 to obtain a damper model, then installing the damper model at the top of a vertically arranged leaf spring, lifting the damper model 3 meters away from the ground, and knocking the damper model by using a movable air hammer to simulate the swing in a strong wind environment; the top of the leaf spring is also provided with a speed accelerator for measuring the instantaneous acceleration during oscillation. The practical experience is that a stainless steel liquid damper (ring shape, tianjin sea Lyme technology Co., ltd.) is added on a chimney 60 m away from the ground, and the acceleration reduction amplitude is 35-40% when 8-level wind (wind speed is 18-20 m/s); acceleration decrease amplitude= (acceleration without damper-acceleration after damper-addition)/acceleration without damper-addition; taking the application in a chimney as an example, the acceleration reduction amplitude is calculated as the maximum value, and the acceleration when the damper is not added is the instantaneous acceleration measured when the top of the chimney swings when the stainless steel liquid damper is not added.
According to the damping effect simulation test, the magnetorheological fluid damper 20 is simulated in the high air 60 m away from the ground, and the acceleration reduction amplitude can reach 39.3% under the blowing of 8-level wind; the total volume of the stainless steel liquid damper can be reduced to 23% of the existing stainless steel liquid damper (ring-shaped, tianjin sea Lyme technology Co., ltd.), the used damping liquid can be reduced by 79%, and the stainless steel liquid damper has smaller volume and weight and is suitable for being arranged at the top of a transmitting tower of a broadcast television.
If the rotation direction of the first spring roll 25 is the same as that of the second spring roll 26, the rest is the same as that of the magneto-rheological liquid damper 20; if the test is carried out according to the damping effect simulation test, the maximum acceleration reduction amplitude is 17 percent.
If the electromagnet 32 is not S-shaped, it is of a long strip-like structure, and the rest is the same as the magnetorheological fluid damper 20; if the test is carried out according to the damping effect simulation test, the maximum acceleration reduction amplitude is 23 percent.
If γ=90°, the remainder is the same as the magnetorheological fluid damper 20; if the test is carried out according to the damping effect simulation test, the maximum acceleration reduction amplitude is 9 percent.
If the movable plate block 222 is not provided, the rest is the same as the magnetorheological fluid damper 20; if the test is carried out according to the damping effect simulation test, the maximum acceleration reduction amplitude is 15 percent.
If the current supplied by the electromagnet 32 is normal dc, the remainder is the same as the magnetorheological fluid damper 20; if the test is carried out according to the damping effect simulation test, the maximum acceleration reduction amplitude is 7 percent.
If at the same time, the magnetic fields generated by two adjacent electromagnets 32 are equal in intensity and opposite in direction, and the rest is the same as the magnetorheological fluid damper 20; if the test is carried out according to the damping effect simulation test, the maximum acceleration reduction amplitude is 8 percent.
If the difference of the magnetic field intensities generated by two adjacent electromagnets 32 is 0.7T at the same time, the rest is the same as the magnetorheological fluid damper 20; if the test is carried out according to the damping effect simulation test, the maximum acceleration reduction amplitude is 13 percent.
If the magnetic field strength and the magnetic field direction generated by every third electromagnet 32 are equal, the rest is the same as the magneto-rheological fluid damper 20; if tested according to damping effect simulation test, the maximum acceleration reduction amplitude is 18%.
Example 2
The upper part of the antenna body 11 is provided with a displacement sensor for detecting the swing amplitude of the upper part of the antenna body 11.
The swing amplitude of the upper part of the antenna body 11 can be monitored in real time through the displacement sensor, and when the swing amplitude reaches a set value, the electromagnet 32 is connected with pulsating direct current; in addition, the maximum current value can be adjusted according to different wind power, so that the vibration suppression effect of the magnetorheological fluid damper 20 is improved; and, the energy is saved to the maximum extent.
Example 3
The damping fluid is prepared by grinding water, gasoline, ferroferric oxide and polypropylene wax according to the mass ratio of 100:72:165:33. The damping fluid is labeled sample 1.
The experimental data between the viscosity and shear rate of sample 1 are shown in table 1, which shows the performance of the non-newtonian fluid at a magnetic field strength of 0.5T, which has a shear thickening effect, thereby significantly improving the vibration resistance effect.
TABLE 1
Group a: the water, the ferroferric oxide and the polypropylene wax are stirred according to the mass ratio of 172:165:33 to prepare a sample 2.
TABLE 2
The experimental data between the viscosity and shear rate of sample 2 are shown in Table 2, which shows shear thinning effect at the latter stage at a magnetic field strength of 0.5T and an ambient temperature of 55℃and cannot be applied to the present invention. Since the temperature of the damping fluid increases sharply when the vibration is converted into the internal energy of the damping fluid, particularly in high-temperature weather, the working environment inside the damping fluid is generally 50 to 70 ℃ (5 hours or more continuously), and thus the vibration suppressing effect is reduced if the damping fluid becomes shear-thinned.
In the damping fluid, if no gasoline is added (the damping fluid is replaced by water with the same mass, and finally the damping fluid is sample 3), the density difference between the lower layer and the upper layer of the damping fluid reaches 0.3g/cm after the damping fluid is placed for one month 3 The above. The density difference between the lower layer and the upper layer of the damping fluid of the invention is not more than 0.1g/cm after the damping fluid is placed for 3 months 3 。
If the gasoline is changed into diesel oil with the same quality, the sample 4 is correspondingly arranged, and after the sample 4 is placed for one month, the lower layer of the sample is connected withThe density difference between the upper layers reached 0.3g/cm 3 The above.
In the invention, the damping fluid with shear thickening is used as a medium, the initial viscosity is low, the flow and circulation of the shear thickening fluid are facilitated, when the damping fluid reaches a working surface and is vibrated, the viscosity is instantaneously increased and becomes solid-like, and the corresponding structure is enabled to perform displacement work, so that the energy generated by vibration is effectively consumed.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The utility model provides a high stability broadcasting television antenna, includes antenna body (11), antenna body (11) are installed at the top of TV transmitting tower (10), its characterized in that: a magneto-rheological liquid damper (20) is arranged between the lower part of the antenna body (11) and the top of the television transmitting tower (10); the magnetorheological fluid damper (20) comprises a circular annular shell (21), a circular mounting pore canal (211) is formed in the center of the annular shell (21), a separation layer (22) is arranged in the annular shell (21), an inner cavity of the annular shell (21) is separated into an upper vibration suppression cavity (23) located above the separation layer (22) and a lower vibration suppression cavity (24) located below the separation layer (22) by the separation layer (22), a spiral first elastic sheet roll (25) is arranged in the upper vibration suppression cavity (23), a spiral second elastic sheet roll (26) is arranged in the lower vibration suppression cavity (24), and the rotation direction of the first elastic sheet roll (25) is opposite to that of the second elastic sheet roll (26); the upper vibration suppression cavity (23) and the lower vibration suppression cavity (24) are communicated through a gap at the separation layer (22), and damping liquid is filled in the upper vibration suppression cavity (23) and the lower vibration suppression cavity (24);
the first elastic sheet roll (25) and the second elastic sheet roll (26) comprise spiral elastic sheet bodies (31), S-shaped electromagnets (32) are embedded in the side walls of the elastic sheet bodies (31), the electromagnets (32) are connected with the elastic sheet bodies (31) into a whole, the electromagnets (32) comprise arc-shaped sheet bodies I (321) and arc-shaped sheet bodies II (322), and the arc-shaped sheet bodies I (321) and the arc-shaped sheet bodies II (322) are arranged in a central symmetry mode;
when the elastic sheet body (31) is spread in a horizontal plane, the chord at the outer side of the first arc-shaped sheet body (321) and the chord at the outer side of the second arc-shaped sheet body (322) are collinear, and an included angle between the chord and the length direction of the elastic sheet body (31) is larger than or equal to 70 degrees and smaller than or equal to 80 degrees.
2. A high stability broadcast television antenna as claimed in claim 1, wherein: γ=77°.
3. A high stability broadcast television antenna as claimed in claim 1, wherein: the separation layer (22) comprises fixed plates (221), movable plates (222) are arranged between two adjacent fixed plates (221), each movable plate (222) is of a hollow structure, the density of each movable plate (222) is smaller than that of damping fluid, the fixed plates (221) are fixedly connected with the annular shell (21), gaps are formed between the fixed plates (221) and the movable plates (222), and circular pits (2221) recessed in the movable plates (222) are formed in the surfaces of the movable plates (222).
4. A high stability broadcast television antenna as claimed in claim 3, wherein: the annular shell (21) and the fixed plate (221) are both made of aluminum alloy, and the movable plate (222) is made of martensitic or ferritic stainless steel.
5. A high stability broadcast television antenna as claimed in claim 3, wherein: a displacement sensor for detecting the swing amplitude of the upper part of the antenna body (11) is arranged on the upper part of the antenna body (11).
6. A high stability broadcast television antenna as claimed in claim 3, wherein: the damping fluid is prepared by grinding water, gasoline, ferroferric oxide and polypropylene wax according to the mass ratio of 100:72:165:33.
7. A high stability broadcast television antenna as claimed in claim 3, wherein: the current which is connected by the electromagnet (32) is pulsating direct current;
the electromagnets (32) are numbered in sequence, the number of the electromagnet (32) positioned at the head part of the elastic sheet body (31) is 1 st, and the magnetic field intensity generated by the 1 st electromagnet (32) is H 1 The method comprises the steps of carrying out a first treatment on the surface of the The number of the electromagnet (32) positioned at the tail part of the projectile body (31) is n, and the magnetic field intensity generated by the n-th electromagnet (32) is H n N is an integer greater than 5;
at the same time H i+1 -H i The magnetic field intensity generated by the ith electromagnet (32) is more than or equal to 1.4T and is H i I is more than or equal to 1 and less than or equal to n-1, wherein i is an integer;
at the same time H j+4 ＝H j The magnetic field strength generated by the jth electromagnet (32) is H j And j is more than or equal to 1 and less than or equal to n-4,j, wherein the magnetic field direction of the jth electromagnet (32) is opposite to the magnetic field direction of the (j+4) th electromagnet (32).
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