CN110702389A - Additional damping measuring device and measuring method thereof - Google Patents
Additional damping measuring device and measuring method thereof Download PDFInfo
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- CN110702389A CN110702389A CN201910954106.8A CN201910954106A CN110702389A CN 110702389 A CN110702389 A CN 110702389A CN 201910954106 A CN201910954106 A CN 201910954106A CN 110702389 A CN110702389 A CN 110702389A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- 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
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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Abstract
The invention relates to the field of building vibration reduction, and provides an additional damping measuring device and a measuring method thereof, wherein the additional damping measuring device comprises: the device comprises a base, a support column, a platform plate, a scale and a fixer; the base includes: a bottom plate and at least one side plate connected to the bottom plate; the landing slab is used for bearing liquid damper or weight, and the landing slab passes through the support post is fixed on the bottom plate, and the curb plate is equipped with the spout to the scale, and the stiff end of scale is connected on the landing slab, and the expansion end activity of scale sets up in the spout, and the expansion end accessible fixer of scale fixes in the spout. According to the additional damping measuring device provided by the invention, the scale is arranged on the platform plate, the displacement of the platform plate is controlled by the fixer, and the movable end of the scale is fixedly or movably arranged in the chute, so that the platform plate can freely vibrate on the bottom plate in cooperation with the liquid damper or the weight, and the additional damping of the liquid damper is effectively measured.
Description
Technical Field
The invention relates to the field of building vibration reduction, in particular to an additional damping measuring device and a measuring method thereof.
Background
Structural vibrations are prevalent in various civil engineering structures. When the structure vibrates excessively, people on the building can feel uncomfortable, and when the structure vibrates to exceed the ultimate bearing capacity of the structure, the structural members can fail, thereby causing damage to the entire structure. As the height of modern civil engineering structure design and construction is increased day by day, the span is increased day by day, and the harm of vibration is more prominent.
The energy-dissipating and vibration-damping technology for structure features that a control mechanism is applied to the structure, which bears the vibration action with the structure, and its local deformation provides additional damping to greatly consume the energy input to the structure for tuning and reducing the vibration reaction of structure. The current vibration damping control method can be divided into active vibration damping and passive vibration damping. The passive vibration reduction is a vibration reduction method which does not install an energy device and consumes energy through a vibration reduction system.
A Tuned Liquid Damper (TLD) is a passive vibration damping structure, and utilizes the fact that liquid in a fixed water tank forms waves in the shaking process and generates dynamic pressure difference with the wall of the TLD tank, and therefore vibration damping force is provided. The TLD device has the advantages of low manufacturing cost, easy installation, less maintenance, good automatic activation performance, easy matching of frequency modulation frequency and the like. The current testing of additional damping of TLDs is mainly to test the additional damping of TLDs using the spectral characteristics that they generate on the structure. However, this method cannot directly test the additional damping of a single liquid damper, and the accuracy of the test result is not high.
Disclosure of Invention
Technical problem to be solved
In view of the technical defects and application requirements, the application provides an additional damping measuring device and a measuring method thereof, aiming at quickly and accurately measuring the additional damping of a liquid damper.
(II) technical scheme
To solve the above problems, the present invention provides an additional damping measuring device, comprising: the device comprises a base, a support column, a platform plate, a scale and a fixer; the base includes: a bottom plate and at least one side plate connected to the bottom plate; the landing slab is used for bearing liquid damper or weight, the landing slab passes through the support post is fixed on the bottom plate, the curb plate be equipped with right the spout of scale, the stiff end of scale is connected on the landing slab, the expansion end activity of scale sets up in the spout, just the expansion end accessible of scale the fixer is fixed in the spout. .
Furthermore, the two opposite sides of the bottom plate are respectively provided with a first side plate and a second side plate which are vertically connected with the bottom plate, and the first side plate and the second side plate are both provided with the sliding grooves.
Further, the bottom plate is provided with a plurality of strength ribs which are transversely or longitudinally arranged on the horizontal plane, the two ends of each strength rib are transversely arranged and are respectively connected with the first side plate and the second side plate, and the strength ribs which are longitudinally arranged are connected between the strength ribs which are transversely arranged.
Further, the support post is vertically connected on the rib, the support post is equipped with a plurality of fixed orificess that set up according to predetermineeing the interval, the landing slab passes through the fixed orifices is fixed on the support post.
Furthermore, the quantity of support post is a plurality of, each support post is equipped with a plurality of fixed orificess that correspond each other and set up according to predetermineeing the interval, the landing slab is through each all the fixed orifices that correspond down on the support post is fixed.
Furthermore, a plurality of sliding grooves which are arranged corresponding to the preset intervals are formed in the first side plate and the second side plate, and each sliding groove is provided with a fixing hole which corresponds to the sliding groove and is arranged at the same height.
Further, still include: a displacement sensor; the displacement sensor includes: the device comprises a quasi-star plate and a laser displacement meter corresponding to the quasi-star plate; the sight board sets up on the platform board, the laser displacement meter corresponds the position setting of sight board, so that when the platform board is the dislocation removal, the laser of laser displacement meter is aimed at the sight of sight board.
Further, displacement sensor's quantity is a plurality of, every displacement sensor's accurate star board and laser displacement meter all correspond the setting, every displacement sensor's accurate star board all sets up on the landing slab, so that when the landing slab does not have the position removal, laser displacement meter's laser is aimed at respective accurate star.
Furthermore, the fixer is an electromagnetic fixer, and the scale is a graduated scale containing a magnet; the holder includes: an electromagnet and a connecting plate; the connecting plate is arranged at the edge of the sliding groove and used for bearing the scale; the electromagnet is arranged in the sliding groove so as to fix or loosen the movable end of the scale through magnetism.
In order to solve the above problem, the present invention further provides a method for measuring additional damping, comprising:
step S1: arranging a liquid damper on the platform plate, giving the platform plate a preset displacement, and fixing the scale in the sliding groove by adopting a fixer; loosening the fixer to enable the platform plate to vibrate freely, and acquiring the natural vibration frequency and damping of the liquid damper;
step S2: replacing the liquid damper with the equal-mass weight, giving the same preset displacement to the platform plate again, and fixing the scale in the sliding groove by adopting a fixer; loosening the fixer to enable the platform plate to vibrate freely, and obtaining the damping of the equal-mass weight;
step S3: and acquiring additional damping of the liquid damper through damping of the liquid damper and damping of the equal-mass weight.
(III) advantageous effects
The invention provides an additional damping measuring device and a measuring method thereof.A scale is arranged on a platform plate, a fixer is used for controlling the displacement of the platform plate, and the movable end of the scale is fixedly or movably arranged in a chute, so that the platform plate can freely vibrate on a bottom plate in cooperation with a liquid damper or a weight, and the additional damping of the liquid damper can be quickly and effectively measured by measuring the difference value of the two.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic three-dimensional structure diagram of a first view of an additional damping measurement apparatus provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a second perspective three-dimensional structure of an additional damping measurement device provided in an embodiment of the present invention;
FIG. 3 is a front view of an additional damping measurement device provided by an embodiment of the present invention;
FIG. 4 is a top view of an additional damping measurement device provided by an embodiment of the present invention;
wherein, 1, a base; 2. a support post; 3. a platform plate; 4. a scale; 5. a quasigillary plate; 6. a laser displacement meter; 7. a holder; 8. a liquid damper.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides an additional damping measurement apparatus, as shown in fig. 1, fig. 2, fig. 3, and fig. 4, the additional damping measurement apparatus including: base 1, support post 2, landing slab 3, scale 4 and fixer 7. The base 1 includes: a bottom panel and at least one side panel attached to the bottom panel. The platform plate 3 is used for carrying a liquid damper 8 or a weight. Platform board 3 is fixed on the bottom plate through support column 2, and the curb plate is equipped with the spout to scale 4, and the stiff end of scale 4 is connected on platform board 3, and the expansion end of scale 4 sets up in the spout movably, and the expansion end accessible fixer 7 of scale 4 fixes in the spout to make platform board 3 can freely vibrate on the bottom plate in coordination with liquid damper 8 or weight.
In the embodiment, the liquid damper 8 provides a damping effect by utilizing the dynamic side force generated by the liquid in the fixed water tank during the shaking process. The weight is equal to the liquid damper 8.
Wherein, the fixer 7 is an electromagnetic fixer, and the scale 4 is a graduated scale containing a magnet. The holder 7 includes: an electromagnet and a connecting plate. The connecting plate sets up the border at the spout for bear scale 4. The electromagnet is arranged in the chute to magnetically fix or loosen the movable end of the scale 4. The position change of the scale 4 can adjust different initial displacements, the larger the initial displacement is in the elastic stage, the smaller the dispersion of the result is, and the additional damping measuring device can test the change results of different initial displacements.
In the testing process, after the additional damping measuring device is assembled, the liquid damper 8 is arranged on the platform plate 3, the platform plate 3 is given preset displacement, and the preset displacement is determined according to the rigidity of the support column 2. The scale 4 is fixed in the chute by a holder 7. The holder 7 is released to allow the platform plate 3 to vibrate freely, and the damping of the liquid damper 8 is obtained. Then, the weight of equal weight is arranged on the platform plate 3 instead of the liquid damper 8, the platform plate 3 is given preset displacement again, and the ruler 4 is fixed in the chute by the fixer 7. And loosening the fixer 7 to enable the platform plate 3 to vibrate freely, and obtaining the damping of the equal-mass weight. And finally, acquiring the additional damping of the liquid damper 8 through the damping of the liquid damper 8 and the damping of the weight with equal mass according to the difference value of the damping of the liquid damper and the damping of the weight with equal mass.
It should be noted that the support columns 2 in the additional damping measurement device can be adjusted to different heights and thicknesses, which will generate different structural rigidity of the platform, and generally speaking, the higher the height or the smaller the thickness, the lower the rigidity. The additional damping measuring device can test the change condition of additional damping under different structural rigidity.
The embodiment of the invention provides an additional damping measuring device, wherein a scale is arranged on a platform plate, a fixer is used for controlling the displacement of the platform plate, the movable end of the scale is fixedly or movably arranged in a chute, so that the platform plate can freely vibrate on a bottom plate in cooperation with a liquid damper or a weight, and the additional damping of the liquid damper can be quickly and effectively measured by measuring the difference value of the two.
In a preferred embodiment, the base 1 may be a U-shaped base or an L-shaped base, as shown in fig. 1, 2, 3 and 4, according to the above-mentioned embodiments. Taking a U-shaped base as an example, two opposite sides of the bottom plate are respectively provided with a first side plate and a second side plate which are vertically connected with the bottom plate, and the first side plate and the second side plate are both provided with sliding grooves.
In order to improve the measurement precision and prevent the damage to the bottom plate caused by overlarge local load, a plurality of stiffening ribs arranged on the horizontal plane along the transverse direction or the longitudinal direction can be arranged on the bottom plate to form a whole. The bottom surface of each rib is connected to the base plate, and the number of ribs can be selected according to the size of the base plate and the measurement range. The two ends of the transversely arranged strength rib are respectively connected with the first side plate and the second side plate, and the longitudinally arranged strength rib is connected between the transversely arranged strength ribs.
Can set up the bolt hole simultaneously on the strength rib for fixed bolster post 2 for 2 vertical connections of support post are on the strength rib, and support post 2 is equipped with according to predetermineeing the interval and a plurality of fixed orificess that set up, generally are 50 mm. The platform plate 3 is fixed on the bracket column 2 through a fixing hole.
Wherein, the quantity of support post 2 is a plurality of, and each support post 2 is equipped with a plurality of fixed orificess that correspond each other and set up according to predetermineeing the interval, and the landing slab 3 is fixed through all fixed orificess that correspond under each support post 2 is same highly.
In this embodiment, the quantity of stake post 2 is four, and four stake posts 2 are all vertical to be connected on the rib. The support column 2 is made of thin steel plate strips, one end of the support column is provided with a hole which is matched and fixed with the hole on the rib of the bottom plate, and the other end of the support column is provided with a hole every 50mm for fixing the support column with the platform plate 3, so that the whole height of the platform plate 3 is adjusted. In addition, the support columns 2 with different thicknesses can be replaced according to requirements, so that the rigidity and the natural vibration period of the device can be changed. The platform plate 3 adopts a ribbed steel plate, the stiffening ribs are welded on the steel plate, and holes can be formed in the stiffening ribs to be matched with the support columns 2 for installation.
The first side plate and the second side plate are respectively provided with a plurality of sliding grooves which are arranged corresponding to the preset intervals, and each sliding groove is provided with a fixing hole which is arranged corresponding to the sliding groove and at the same height. According to specific requirements, the movable end of the scale 4 is selectively arranged in the sliding groove of the first side plate or the sliding groove of the second side plate, or two scales 4 are arranged simultaneously, and the movable ends of the two scales 4 are respectively arranged in the sliding groove of the first side plate or the sliding groove of the second side plate.
In order to accurately calculate the displacement, the additional damping measuring device can be additionally provided with a displacement sensor. The displacement sensor includes: a quasar plate 5 and a laser displacement meter 6 corresponding thereto. The quasi-star plate 5 is arranged on the platform plate 3, and the laser displacement meter 6 is arranged corresponding to the position of the quasi-star plate 5, so that when the platform plate 3 moves in a non-position mode, the laser of the laser displacement meter 6 is aligned with the quasi-star of the quasi-star plate 5. In addition, in order to save data in time, a dynamic test acquisition instrument, a computer and corresponding acquisition software can be arranged to cooperate with data collection and calculation.
In order to increase the accuracy of measurement, the number of the displacement sensors can be set to be a plurality of, generally two, and the displacement sensors are respectively arranged on two sides of the additional damping measurement device. The sight plate 5 and the laser displacement meter 6 of each displacement sensor are correspondingly arranged, and the sight plate 5 of each displacement sensor is arranged on the platform plate 3, so that when the platform plate 3 moves in a non-position mode, the laser of the laser displacement meter 6 is aligned to the respective sight. In general, only one laser displacement meter 6 and a corresponding sight are required to be arranged on the left side and the right side of the platform plate 3, the laser displacement meters can be adjusted to different platforms according to the height of the platform plate 3,
in the testing process, after the additional damping measuring device is assembled, the liquid damper 8 is arranged on the platform plate 3, the laser displacement meter 6 is debugged, cleared and started, the platform plate 3 is given preset displacement, the preset displacement is determined according to the rigidity of the support column 2 and is set according to the requirement of a tester, but the rigidity limit value of the support column 2 cannot be exceeded. The scale 4 is fixed in the chute by a holder 7. And loosening the fixer 7 to enable the platform plate 3 to vibrate freely, and sending the recorded numerical value to a dynamic test acquisition instrument or a computer by the laser displacement meter 6 to obtain the damping of the liquid damper 8. Then, the weight with equal weight is arranged on the platform plate 3 instead of the liquid damper 8, the laser displacement meter 6 is debugged, reset and started, the platform plate 3 is given preset displacement again, and the ruler 4 is fixed in the chute by the fixer 7. The holder 7 is released and the platform plate 3 is allowed to vibrate freely. And the laser displacement meter 6 sends the recorded numerical value to a dynamic test acquisition instrument or a computer to obtain the damping of the equal-mass weight. And finally, acquiring the additional damping of the liquid damper 8 through the damping of the liquid damper 8 and the damping of the weight with equal mass according to the difference value of the damping of the weight with equal mass, namely performing frequency spectrum transformation on the structural response measured under the two working conditions, calculating the damping of the two structures, wherein the difference between the damping of the liquid damper 8 and the damping of the weight with equal mass is the additional damping of the liquid damper 8.
An embodiment of the present invention further provides a method for measuring additional damping, where the method for measuring additional damping is based on the above additional damping measuring apparatus, and as shown in fig. 1, fig. 2, fig. 3, and fig. 4, the additional damping measuring apparatus includes: base 1, support post 2, landing slab 3, scale 4 and fixer 7. The base 1 includes: a bottom panel and at least one side panel attached to the bottom panel. The platform plate 3 is used for carrying a liquid damper 8 or a weight. Platform board 3 is fixed on the bottom plate through support column 2, and the curb plate is equipped with the spout to scale 4, and the stiff end of scale 4 is connected on platform board 3, and the expansion end of scale 4 sets up in the spout movably, and the expansion end accessible fixer 7 of scale 4 fixes in the spout to make platform board 3 can freely vibrate on the bottom plate in coordination with liquid damper 8 or weight. For more details, please refer to the text description related to fig. 1 to 4, which is not repeated herein.
The measuring method comprises the following steps:
step S1: arranging a liquid damper on the platform plate, giving the platform plate a preset displacement, and fixing the scale in the sliding groove by adopting a fixer; loosening the fixer to enable the platform plate to vibrate freely, and acquiring the natural vibration frequency and damping of the liquid damper;
step S2: replacing the liquid damper with the weight with equal mass weight, giving the same preset displacement to the platform plate again, and fixing the ruler in the chute by adopting a fixer; loosening the fixer to enable the platform plate to vibrate freely, and obtaining the damping of the equal-mass weight;
step S3: and acquiring additional damping of the liquid damper through damping of the liquid damper and damping of the weight with equal mass.
In the testing process, after the additional damping measuring device is assembled, the liquid damper 8 is arranged on the platform plate 3, the laser displacement meter 6 is debugged, reset and started, the platform plate 3 is given a preset displacement, and the preset displacement is determined according to the rigidity of the support column 2. The scale 4 is fixed in the chute by a holder 7. And loosening the fixer 7 to enable the platform plate 3 to vibrate freely, and sending the recorded numerical value to a dynamic test acquisition instrument or a computer by the laser displacement meter 6 to obtain the natural vibration frequency and damping of the liquid damper 8. Then, the weight with equal weight is arranged on the platform plate 3 instead of the liquid damper 8, the laser displacement meter 6 is debugged, reset and started, the same preset displacement is given to the platform plate 3 again, and the ruler 4 is fixed in the chute by the fixer 7. And loosening the fixer 7 to enable the platform plate 3 to vibrate freely, and sending the recorded numerical value to a dynamic test acquisition instrument or a computer by the laser displacement meter 6 to obtain the natural vibration frequency and the damping of the equal-mass weight. And finally, acquiring the additional damping of the liquid damper 8 through the damping of the liquid damper 8 and the damping of the weights with equal mass according to the difference value of the two damping values, namely performing frequency spectrum transformation on the structural response measured under the two working conditions, and calculating the damping of the two structures.
The embodiment of the invention provides a method for measuring additional damping, which is characterized in that a scale is arranged on a platform plate, a fixer is used for controlling the displacement of the platform plate, and the movable end of the scale is fixedly or movably arranged in a chute, so that the platform plate can freely vibrate on a bottom plate in cooperation with a liquid damper or a weight, and the additional damping of the liquid damper can be quickly and effectively measured by measuring the difference value of the two.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An additional damping measurement device, comprising:
the device comprises a base, a support column, a platform plate, a scale and a fixer; the base includes: a bottom plate and at least one side plate connected to the bottom plate; the landing slab is used for bearing liquid damper or weight, the landing slab passes through the support post is fixed on the bottom plate, the curb plate be equipped with right the spout of scale, the stiff end of scale is connected on the landing slab, the expansion end activity of scale sets up in the spout, just the expansion end accessible of scale the fixer is fixed in the spout.
2. The additional damping measuring device of claim 1, wherein the bottom plate is provided with a first side plate and a second side plate vertically connected to the bottom plate, and the sliding grooves are provided on the first side plate and the second side plate.
3. The additional damping measuring device according to claim 2, wherein the bottom plate is provided with a plurality of strength ribs arranged in a horizontal plane in a transverse direction or a longitudinal direction, both ends of the transversely arranged strength ribs are connected with the first side plate and the second side plate, respectively, and the longitudinally arranged strength ribs are connected between the transversely arranged strength ribs.
4. The additional damping measuring device of claim 3, wherein the bracket post is vertically connected to the rib, the bracket post is provided with a plurality of fixing holes arranged at predetermined intervals, and the platform plate is fixed to the bracket post through the fixing holes.
5. The additional damping measuring device of claim 4, wherein the number of the support columns is plural, each of the support columns is provided with a plurality of fixing holes corresponding to each other and arranged at predetermined intervals, and the platform plate is fixed by all the fixing holes corresponding to each of the support columns at the same height.
6. The additional damping measuring device of claim 5, wherein a plurality of sliding grooves are formed on each of the first side plate and the second side plate corresponding to the predetermined intervals, and each of the sliding grooves is provided with the fixing hole corresponding thereto and formed at the same height.
7. The additional damping measurement device of claim 1, further comprising: a displacement sensor; the displacement sensor includes: the device comprises a quasi-star plate and a laser displacement meter corresponding to the quasi-star plate;
the sight board sets up on the platform board, the laser displacement meter corresponds the position setting of sight board, so that when the platform board is the dislocation removal, the laser of laser displacement meter is aimed at the sight of sight board.
8. The additional damping measuring device of claim 7, wherein the number of the displacement sensors is plural, the quasi-star plate and the laser displacement meter of each displacement sensor are correspondingly arranged, and the quasi-star plate of each displacement sensor is arranged on the platform plate, so that the laser of the laser displacement meter is aligned with the respective quasi-star when the platform plate moves in an unset manner.
9. The additional damping measurement device of claim 1, wherein the holder is an electromagnetic holder and the scale is a graduated scale comprising a magnet;
the holder includes: an electromagnet and a connecting plate; the connecting plate is arranged at the edge of the sliding groove and used for bearing the scale; the electromagnet is arranged in the sliding groove so as to fix or loosen the movable end of the scale through magnetism.
10. A method of measuring additional damping, comprising:
step S1: arranging a liquid damper on the platform plate, giving the platform plate a preset displacement, and fixing the scale in the sliding groove by adopting a fixer; loosening the fixer to enable the platform plate to vibrate freely, and acquiring the natural vibration frequency and damping of the liquid damper;
step S2: replacing the liquid damper with the weight with equal mass weight, giving the same preset displacement to the platform plate again, and fixing the ruler in the chute by adopting a fixer; loosening the fixer to enable the platform plate to vibrate freely, and obtaining the damping of the equal-mass weight;
step S3: and acquiring additional damping of the liquid damper through damping of the liquid damper and damping of the weight with equal mass.
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