CN113024906A - Preparation method of viscoelastic damping material and velocity type viscoelastic damper prepared from viscoelastic damping material - Google Patents
Preparation method of viscoelastic damping material and velocity type viscoelastic damper prepared from viscoelastic damping material Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
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Abstract
The invention relates to the technical field of dampers, in particular to a preparation method of a viscoelastic damping material and a velocity type viscoelastic damper prepared by the preparation method. The preparation method comprises the following steps: s1 damping material configuration: the paint comprises the following components in parts by weight: 50-80 parts of diene rubber, 20-50 parts of nitrile rubber, 7-14 parts of a metal activation system, 2-7 parts of a vulcanization system, 4-20 parts of an anti-aging system, 5-70 parts of a filling system, 0-30 parts of a plasticizing system, 0-40 parts of a shear thickening material and 0-20 parts of resin; s2, adding the diene rubber and the nitrile rubber into a closed mixing roll; s3, putting the obtained rubber compound into a mold, and performing compression vulcanization molding in a vulcanizing machine. The preparation method of the viscoelastic damping material and the velocity type viscoelastic damper prepared by the preparation method have obvious low-frequency energy consumption sensitivity and excellent fatigue resistance, and can be used in a wider temperature range.
Description
Technical Field
The invention relates to the technical field of dampers, in particular to a preparation method of a viscoelastic damping material and a velocity type viscoelastic damper prepared by the preparation method.
Background
The viscoelastic damper is a damping energy dissipation device formed by laminating and vulcanizing viscoelastic damping materials and steel plates, and is mainly applied to buildings to reduce wind vibration or earthquake action.
The traditional viscoelastic damping material is based on rubber, and a large amount of fillers such as carbon black, silicon dioxide and the like or adhesion endowing agents such as petroleum resin, organic micromolecules and the like are added, so that the energy consumption capability of the rubber is improved. However, materials such as a large amount of filling materials, petroleum resin and the like can cause difficult processing of the materials, the prepared damper has large stress attenuation and poor fatigue performance, and the energy consumption capability can not meet the energy consumption requirements of buildings under different seismic frequencies. Therefore, it is urgently needed to develop a viscoelastic damping material with a high loss factor in a wide temperature range so as to solve the problems of unobvious low-frequency speed sensitivity and poor fatigue resistance of the conventional viscoelastic damper.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method of a viscoelastic damping material with reliable performance and a speed type viscoelastic damper prepared by the same, which has obvious low-frequency energy consumption sensitivity and excellent fatigue resistance and can be used in a wider temperature range.
The technical scheme of the invention is realized as follows: a preparation method of a viscoelastic damping material comprises the following steps:
s1), damping material configuration: the paint comprises the following components in parts by weight: 50-80 parts of diene rubber, 20-50 parts of nitrile rubber, 7-14 parts of a metal activation system, 2-7 parts of a vulcanization system, 4-20 parts of an anti-aging system, 5-70 parts of a filling system, 0-30 parts of a plasticizing system, 0-40 parts of a shear thickening material and 0-20 parts of resin;
s2), adding the diene rubber and the nitrile rubber into a closed mixing roll, and plasticating the rubber for 1-2 min; then adding a metal activation system, an anti-aging system and resin for mixing for 1-2 min; then adding the filling system and the shear thickening gel for mixing for 0.5-1 min, finally adding the plasticizing system and the rest components, and mixing for 1-3 min for rubber discharge after one-time or several-time input, and standing the rubber material for 8 hours for later use;
s3), putting the rubber material obtained in the previous step into a mold, and performing compression vulcanization molding in a vulcanizing machine, wherein the vulcanization temperature is set to be 120-155 ℃, the pressure is set to be 10-15 MPa, and the time is 15-40 minutes.
Preferably, the metal activation system is zinc oxide and stearic acid, and the mass ratio of the zinc oxide to the stearic acid is 5-10: 2 to 4.
Preferably, the vulcanization system includes vulcanizing agent S-80, accelerator DM and accelerator NS. The mass ratio of the vulcanizing agent S-80 to the accelerator DM to the accelerator NS is 0.8-3: 0.4-1: 0.6 to 3. The vulcanization system can ensure that the vulcanized rubber has high tensile strength, good elasticity and good fatigue resistance.
Preferably, the anti-aging system comprises an anti-aging agent 4010NA, an antioxidant AO-80, an antioxidant AO-6 and microcrystalline wax; the mass ratio of the antioxidant 4010NA, the antioxidant AO-80, the antioxidant A0-60 to the microcrystalline wax is (1-3): 1-20: 1-20: 0.5 to 2. The anti-aging system can improve the thermal aging performance, the ozone aging resistance and the wide-temperature-range usability of the viscoelastic damper.
Preferably, the filling system comprises calcium carbonate, carbon black N330 and basic white carbon black. The mass ratio of the calcium carbonate to the carbon black N330 to the alkaline white carbon black is 0-30: 5-50: 0 to 20. The alkaline white carbon black can be used as an acid-base regulator, so that the acid-base property of the viscoelastic damping material is regulated, and the compatibility of the shear thickening material in the composite material can be increased. The structure of the basic white carbon siloxane is similar to that of the shear thickening material, so that the compatibility of the basic white carbon siloxane and the shear thickening material is improved; free hydroxyl, silanol and other strong electron-donating groups on the surface of the alkaline white carbon black are mutually combined with electron-withdrawing groups in a siloxane chain segment of the shear thickening material, so that an adsorption layer is formed, and the alkaline white carbon black and the polyborosiloxane are connected into an integral three-dimensional network.
The plasticizing system comprises a plasticizer TP-90B and liquid unsaturated rubber; the mass ratio of the plasticizer TP-90B to the liquid unsaturated rubber is (0-15): 0 to 20. The liquid rubber has small molecular weight, is rich in flexible double bonds, has low glass transition temperature, is added with the viscoelastic damping material, can improve the flexibility of a material molecular chain segment on one hand and improve the low-temperature resistance, and can be crosslinked and grafted with the viscoelastic damping material on a macromolecular chain segment of the viscoelastic damping material on the other hand to achieve the effects of widening the temperature range of the viscoelastic damping material, improving the rebound resilience and reducing the fatigue attenuation.
The shear thickening material is a polyborosiloxane compound that becomes more viscous as the shear rate increases.
The resin is an aromatic hydrocarbon modified hydrocarbon. The aromatic hydrocarbon modified hydrocarbon is used as a modified petroleum resin, and is added into the viscoelastic damping material to improve the compatibility and uniformity among the compounds and improve the energy consumption capability and the cohesiveness of the viscoelastic damping material.
The invention also provides a velocity type viscoelastic damper which is made of the viscoelastic damping material obtained by the preparation method, wherein the velocity type viscoelastic damper has force change rates of more than 100% at a low frequency of 0.1-5 HZ, and the shear stiffness and the energy consumption capacity are increased along with the increase of the applied frequency; at the highest frequency, the energy consumption capacity is increased by more than 1 time, the fatigue performance is 60 circles, and the energy consumption capacity and the effective rigidity are attenuated within +/-15%.
The invention solves the defects in the background technology and has the following beneficial effects:
the invention provides a preparation method of a viscoelastic damping material with reliable performance and a speed type viscoelastic damper prepared by the same, which has obvious low-frequency energy consumption sensitivity and excellent fatigue resistance and can be used in a wider temperature range. According to the invention, a shear thickening material, an acid-base regulator and a plasticizing system are added into a parallel rubber of diene rubber and nitrile rubber, the rubber has a loss factor higher than 0.3 in a wide temperature range (-20-40 ℃), and has strong speed sensitivity and excellent fatigue resistance, a viscoelastic damper prepared from the rubber also has obvious speed sensitivity at low frequency (0.1-5 HZ), the equivalent damping ratio is gradually increased along with the increase of loading frequency, the energy consumption capability and the effective rigidity are increased, and the energy consumption capability can be increased by more than 1 time at the highest frequency; the fatigue performance is 60 circles, and the energy consumption capability and the effective rigidity attenuation are within +/-15%.
Drawings
FIG. 1 dynamic mechanical temperature spectrum of preparation method of viscoelastic damping material
FIG. 2 is a load-displacement curve of example 1;
FIG. 3 is a load-displacement curve of example 2;
FIG. 4 is a load-displacement curve of example 3;
FIG. 5 is a load-displacement curve of example 4;
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Example 1
The embodiment provides a preparation method of a viscoelastic damping material, which comprises the following steps:
s1), damping material configuration: the paint comprises the following components in parts by weight: 50 parts of diene rubber, 20 parts of nitrile rubber, 5 parts of zinc oxide, 2 parts of stearic acid, 800.8 parts of vulcanizing agent S, 0.7 part of accelerator DM, 1.5 parts of accelerator NS, 1 part of anti-aging agent 4010NA, 1 part of antioxidant AO-801, 601 parts of antioxidant AO-601, 1 part of microcrystalline wax, 1 part of calcium carbonate, 1 part of carbon black N3303, 1 part of basic white carbon black NA, 1 part of plasticizer TP-90B, 1 part of liquid unsaturated rubber LBR, 1 part of polyborosiloxane compound and 145A 1 part of aromatic hydrocarbon modified hydrocarbon.
S2), adding the diene rubber and the nitrile rubber into a closed mixing roll, and plasticating the rubber for 1-2 min; then adding a metal activation system, an anti-aging system and resin for mixing for 1-2 min; then adding the filling system and the shear thickening gel for mixing for 0.5-1 min, finally adding the plasticizing system and the rest components, and mixing for 1-3 min for rubber discharge after one-time or several-time input, and standing the rubber material for 8 hours for later use;
s3), putting the rubber material obtained in the previous step into a mold, and performing compression vulcanization molding in a vulcanizing machine, wherein the vulcanization temperature is set to 120 ℃, the pressure is set to 10MPa, and the time is 15 minutes.
Example 2
The embodiment provides a preparation method of a viscoelastic damping material, which comprises the following steps:
s1), damping material configuration: the paint comprises the following components in parts by weight: 60 parts of diene rubber, 30 parts of nitrile rubber, 6 parts of zinc oxide, 3 parts of stearic acid, 801.5 parts of vulcanizing agent S, 1 part of accelerator DM, 2.5 parts of accelerator NS, 1 part of anti-aging agent 4010NA, 3 parts of antioxidant AO-803, 605 parts of antioxidant AO-605, 1 part of microcrystalline wax, 2 parts of calcium carbonate, 3306 parts of carbon black N, 5 parts of basic white carbon black NA, 2 parts of plasticizer TP-90B, 3 parts of liquid unsaturated rubber LBR, 5 parts of polyborosiloxane compound and 145A 6 parts of aromatic hydrocarbon modified hydrocarbon.
S2), adding the diene rubber and the nitrile rubber into a closed mixing roll, and plasticating the rubber for 1-2 min; then adding a metal activation system, an anti-aging system and resin for mixing for 1-2 min; then adding the filling system and the shear thickening gel for mixing for 0.5-1 min, finally adding the plasticizing system and the rest components, and mixing for 1-3 min for rubber discharge after one-time or several-time input, and standing the rubber material for 8 hours for later use;
s3), putting the rubber material obtained in the previous step into a mold, and carrying out compression vulcanization molding in a vulcanizing machine, wherein the vulcanization temperature is set to be 140 ℃, the pressure is set to be 12MPa, and the time is 30 minutes.
Example 3
The embodiment provides a preparation method of a viscoelastic damping material, which comprises the following steps:
s1), damping material configuration: the paint comprises the following components in parts by weight: 80 parts of diene rubber, 50 parts of nitrile rubber, 10 parts of zinc oxide, 4 parts of stearic acid, S-803 parts of vulcanizing agent, 1 part of accelerator DM, 3 parts of accelerator NS, 3 parts of anti-aging agent 4010NA, 3 parts of antioxidant AO-807, 608 parts of antioxidant AO, 2 parts of microcrystalline wax, 30 parts of calcium carbonate, 33020 parts of carbon black N, 20 parts of basic white carbon black NA, 15 parts of plasticizer TP-90B, 15 parts of liquid unsaturated rubber LBR, 40 parts of polyborosiloxane compound and 145A 20 parts of aromatic hydrocarbon modified hydrocarbon compound.
S2), adding the diene rubber and the nitrile rubber into a closed mixing roll, and plasticating the rubber for 1-2 min; then adding a metal activation system, an anti-aging system and resin for mixing for 1-2 min; then adding the filling system and the shear thickening gel for mixing for 0.5-1 min, finally adding the plasticizing system and the rest components, and mixing for 1-3 min for rubber discharge after one-time or several-time input, and standing the rubber material for 8 hours for later use;
s3), putting the rubber material obtained in the previous step into a mold, and performing compression vulcanization molding in a vulcanizing machine, wherein the vulcanization temperature is set to 155 ℃, the pressure is set to 15MPa, and the time is 40 minutes.
Example 4
The embodiment provides a preparation method of a viscoelastic damping material, which comprises the following steps:
s1), damping material configuration: the paint comprises the following components in parts by weight: 70 parts of diene rubber, 40 parts of nitrile rubber, 9 parts of zinc oxide, 3 parts of stearic acid, S-802 parts of vulcanizing agent, 1 part of accelerator DM, 3 parts of accelerator NS, 2 parts of anti-aging agent 4010NA, 3 parts of antioxidant AO-807, 606 parts of antioxidant AO, 1 part of microcrystalline wax, 20 parts of calcium carbonate, 33015 parts of carbon black N, 15 parts of basic white carbon black NA, 9 parts of plasticizer TP-90B, 11 parts of liquid unsaturated rubber LBR, 20 parts of polyborosiloxane compound and 145A 15 parts of aromatic hydrocarbon modified hydrocarbon compound.
S2), adding the diene rubber and the nitrile rubber into a closed mixing roll, and plasticating the rubber for 1-2 min; then adding a metal activation system, an anti-aging system and resin for mixing for 1-2 min; then adding the filling system and the shear thickening gel for mixing for 0.5-1 min, finally adding the plasticizing system and the rest components, and mixing for 1-3 min for rubber discharge after one-time or several-time input, and standing the rubber material for 8 hours for later use;
s3), putting the rubber material obtained in the previous step into a mold, and performing compression vulcanization molding in a vulcanizing machine, wherein the vulcanization temperature is set to 145 ℃, the pressure is set to 12MPa, and the time is 35 minutes.
The invention also provides a velocity type viscoelastic damper which is prepared from the viscoelastic damping material. The velocity type viscoelastic damper mainly comprises two outer steel plates, a plurality of middle steel plates and a rubber layer between the steel plates. And (3) carrying out hot refining and fine refining on the prepared viscoelastic damping material, and then cutting the viscoelastic damping material into rubber sheets with required sizes through a three-roller calender, a cooling line and a sheet cutter. And performing surface treatment on the inner sides of the two outer steel plates and the two sides of the middle steel plate, and coating an adhesive. And sequentially placing the outer steel plate, the rubber sheet, the middle steel plate, the rubber sheet, the outer steel plate and the like into a mold, and carrying out mold pressing, vulcanization, bonding and molding in a vulcanizing machine with the vulcanization temperature of 120-150 ℃ and the vulcanization pressure of 10-15 Mpa to prepare the speed type viscoelastic damper.
With the viscoelastic damping materials of the velocity-type viscoelastic dampers provided in examples 1 to 4, as shown in fig. 1, dynamic mechanical properties were tested by dynamic mechanical analysis (DMA 242C); the temperature range is-100 ℃ to 60 ℃, the heating rate is 3 ℃/min, the maximum amplitude is 50 mu m, the frequency is 0.1Hz to 5Hz, a stretching deformation mode is adopted, and a dynamic mechanical temperature spectrum at 0.333Hz is shown in figure 1.
As shown in table 1, the viscoelastic damping materials of the velocity-type viscoelastic dampers provided in embodiments 1 to 4 have a wider effective damping temperature range, a higher maximum loss factor, and a better application range.
TABLE 1 viscoelastic damping material loss factor test for velocity-type viscoelastic dampers
| tanδmax | Tan delta > 0.3 temperature range | |
| Example 1 | 0.867 | -10℃～42℃ |
| Example 2 | 0.872 | -18℃～38℃ |
| Example 3 | 0.886 | -20℃～37℃ |
| Example 4 | 0.903 | -23℃～33℃ |
Velocity-type viscoelastic dampers prepared from the viscoelastic damping materials provided in examples 1-4, respectively. The change rate of the viscoelastic damper from 0.2Hz to 3Hz is tested by adopting the frequency correlation test of GJ/T209 and 2012 energy dissipation damper for buildings, and the test result is shown in Table 2. For the viscoelastic damping material, the loss factor tan delta is more than or equal to 0.86 under large strain, which means that the material has excellent damping and shock absorption functions.
TABLE 2 frequency correlation test of velocity-type viscoelastic damper
As shown in table 2, the rate-type viscoelastic damper prepared by using the viscoelastic damping materials provided in examples 1 to 4 has a frequency dependency of more than 100% at the maximum speed of 0.2Hz to 5Hz, and has an obvious velocity dependency.
As shown in fig. 2 to 5, the velocity type viscoelastic damper test load-displacement curves at different frequencies were prepared by using the viscoelastic damping materials provided in examples 1 to 4. The frequency correlation of the composite material is that the shear stiffness and the energy consumption capability of the composite material are increased along with the increase of the applied frequency under the condition of 0.2 Hz-5 Hz, and the composite material has obvious velocity correlation.
Velocity type viscoelastic dampers were prepared from the viscoelastic damping materials provided in examples 1-4. The 60-circle fatigue performance of the steel plate is tested by adopting GJ/T209 and 2012 energy dissipation dampers of buildings, and the test result is shown in Table 3.
TABLE 3 fatigue Performance testing of maximum damping force for velocity type viscoelastic dampers
| Before fatigue/kN | After fatigue/kN | Rate of change | |
| Example 1 | 248 | 234 | -5.6％ |
| Example 2 | 230 | 214 | -7.5％ |
| Example 3 | 213 | 195 | -9.2％ |
| Example 4 | 208 | 188 | -10.6％ |
As shown in table 3, the rate of change of the velocity viscoelastic damper prepared by using the viscoelastic damping materials provided in examples 1 to 4 before and after the fatigue performance test was 60 cycles was within the range of ± 15%.
In summary, the invention discloses a preparation method of a viscoelastic damping material for a velocity type viscoelastic damper, and a velocity type viscoelastic damper prepared from the viscoelastic damping material. The viscoelastic damping material is prepared by taking diene rubber and nitrile rubber as rubber main bodies and matching a special metal activation system, a vulcanization system, an anti-aging system, a filling system, a plasticizing system, a shear thickening material and resin according to a specific proportion. Scientific raw material proportion, simple preparation and low cost. The preparation method can uniformly disperse various rubbers, has stable performance, fully exerts the characteristics of each rubber, fully distributes the compounds such as an activating agent, an anti-aging agent, petroleum resin, shear thickening gel and the like in the rubber, mixes the compounds with silicon dioxide, carbon black and the like, and can ensure that each component can more effectively exert functions, thereby further improving the material attenuation performance and the compatibility of the viscoelastic body. According to the invention, a shear thickening material, an acid-base regulator and a plasticizing system are added into a parallel rubber of diene rubber and nitrile rubber, the rubber has a loss factor higher than 0.3 in a wide temperature range (-20-40 ℃), and has strong speed sensitivity and excellent fatigue resistance, a viscoelastic damper prepared from the rubber also has obvious speed sensitivity at low frequency (0.1-5 HZ), the equivalent damping ratio is gradually increased along with the increase of loading frequency, the energy consumption capability and the effective rigidity are increased, and the energy consumption capability can be increased by more than 1 time at the highest frequency; the fatigue performance is 60 circles, and the energy consumption capability and the effective rigidity attenuation are within +/-15%.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. A preparation method of a viscoelastic damping material is characterized by comprising the following steps:
s1), damping material configuration: the paint comprises the following components in parts by weight: 50-80 parts of diene rubber, 20-50 parts of nitrile rubber, 7-14 parts of a metal activation system, 2-7 parts of a vulcanization system, 4-20 parts of an anti-aging system, 5-70 parts of a filling system, 0-30 parts of a plasticizing system, 0-40 parts of a shear thickening material and 0-20 parts of resin;
s2), adding the diene rubber and the nitrile rubber into a closed mixing roll, and plasticating the rubber for 1-2 min; then adding a metal activation system, an anti-aging system and resin for mixing for 1-2 min; then adding the filling system and the shear thickening gel for mixing for 0.5-1 min, finally adding the plasticizing system and the rest components, and mixing for 1-3 min for rubber discharge after one-time or several-time input, and standing the rubber material for 8 hours for later use;
s3), putting the rubber material obtained in the previous step into a mold, and performing compression vulcanization molding in a vulcanizing machine, wherein the vulcanization temperature is set to be 120-155 ℃, the pressure is set to be 10-15 MPa, and the time is 15-40 minutes.
2. A method of preparing a viscoelastic damping material as claimed in claim 1, wherein: the metal activation system comprises zinc oxide and stearic acid; the mass ratio of the zinc oxide to the stearic acid is 5-10: 2 to 4.
3. A method of preparing a viscoelastic damping material as claimed in claim 1, wherein: the vulcanization system comprises a vulcanizing agent S-80, an accelerator DM and an accelerator NS; the mass ratio of the vulcanizing agent S-80 to the accelerator DM to the accelerator NS is 0.8-3: 0.4-1: 0.6 to 3.
4. A method of preparing a viscoelastic damping material as claimed in claim 1, wherein: the anti-aging system comprises an anti-aging agent 4010NA, an antioxidant AO-80, an antioxidant AO-60 and microcrystalline wax; the mass ratio of the antioxidant 4010NA, the antioxidant AO-80, the antioxidant A0-60 to the microcrystalline wax is (1-3): 1-20: 1-20: 0.5 to 2.
5. A method of preparing a viscoelastic damping material as claimed in claim 1, wherein: the filling system comprises calcium carbonate, carbon black N330 and basic white carbon black; the mass ratio of the calcium carbonate to the carbon black N330 to the alkaline white carbon black is 0-30: 5-50: 0 to 20.
6. A method of preparing a viscoelastic damping material as claimed in claim 1, wherein: the plasticizing system comprises a plasticizer TP-90B and liquid unsaturated rubber; the mass ratio of the plasticizer TP-90B to the liquid unsaturated rubber is (0-15): 0 to 20.
7. A method of preparing a viscoelastic damping material as claimed in claim 1, wherein: the shear thickening material is a polyborosiloxane compound.
8. A method of preparing a viscoelastic damping material as claimed in claim 1, wherein: the resin is an aromatic hydrocarbon modified hydrocarbon.
9. A velocity type viscoelastic damper made of the viscoelastic damping material obtained by the production method according to claims 1 to 8, characterized in that: when the speed type viscoelastic damper is at a low frequency of 0.1-5 HZ, the force change rate is more than 100%, and the shear stiffness and the energy consumption capacity are increased along with the increase of the applied frequency; at the highest frequency, the energy consumption capacity is increased by more than 1 time, the fatigue performance is 60 circles, and the energy consumption capacity and the effective rigidity are attenuated within +/-15%.
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