A test method for overload protection viscous damper

Abstract

The present invention proposes a test and detection method for an overload protection type viscous damper, the method comprising the following steps: adopting a static loading test, controlling the loading unit of the test machine to make the overload protection type viscous damper to be tested move at a uniform speed, and recording the limit displacement value of the reciprocating motion of the damper; setting a total of four independent tests, respectively testing at three speed gears and corresponding test displacements, the test speed and test displacement in the first test are consistent with the parameter settings in the last test. By adopting a static loading test and uniform motion control, the actual working state of the damper can be accurately simulated, the accuracy and representativeness of the test results can be improved, and by comparing the maximum output deviations of the first and fourth tests, the durability and consistency of the damper can be effectively evaluated to ensure its reliability in long-term use.

Description

Technical Field

[0001] The invention belongs to the field of viscous damper testing, and in particular relates to a test detection method for an overload protection type viscous damper. Background Art

[0002] Overload protection viscous damper is an important structural shock absorption device, which is widely used in engineering fields such as buildings and bridges, and plays an important role in improving the seismic performance of structures. This type of damper achieves the purpose of shock absorption by filling a special viscous fluid in a sealed cavity and using the shear deformation of the fluid to consume the seismic input energy. At the same time, the overload protection viscous damper also has the function of preventing excessive deformation of the structure, which can protect the main structure from damage under the action of an earthquake. However, there are still some problems and challenges in the performance evaluation and quality inspection of overload protection viscous dampers. The traditional static loading test method is difficult to truly simulate the dynamic response characteristics under the action of an earthquake, and it is impossible to fully evaluate the shock absorption performance of the damper. Although the dynamic loading test can better reflect the actual working conditions, the equipment cost is high and the operation is complicated, making it difficult to be widely used. In addition, the existing test methods often only focus on the mechanical properties of the damper, ignore the detection of the overload protection function, and cannot fully evaluate the comprehensive performance of the damper.

[0003] There are also deficiencies in the collection and analysis methods of test data, making it difficult to accurately extract key performance parameters. On the other hand, the existing testing standards and specifications are not perfect, and there is a lack of a unified evaluation index system, which makes it difficult to compare the performance of dampers produced by different manufacturers horizontally. Furthermore, the evaluation method of damper performance degradation under long-term service conditions needs to be improved, making it difficult to accurately predict the service life of the damper. Therefore, it is urgent to develop a new, comprehensive, and efficient test method to accurately evaluate the comprehensive performance of overload protection viscous dampers and provide reliable technical support for engineering applications. This method should be able to simultaneously consider the damping performance and overload protection function of the damper, take into account both static and dynamic loading conditions, and effectively collect and analyze test data to extract key performance parameters. At the same time, a unified evaluation index system should be established to achieve horizontal comparisons between different products and evaluate performance degradation under long-term service conditions. The development of such an advanced test method will help improve the design, production, and application level of overload protection viscous dampers, further enhance the seismic resistance of engineering structures, and is of great significance to improving the level of seismic resistance technology of my country's buildings. Therefore, there is an urgent need for a test method for overload protection viscous dampers. Summary of the invention

[0004] The present invention proposes a test method for an overload protection type viscous damper, which solves the problem of incomplete performance evaluation of the overload protection type viscous damper in the prior art. Through multiple tests at different speeds and displacements, the damping performance and overload protection function of the damper are comprehensively evaluated. At the same time, by comparing the first and last test results, the stability and reliability of the damper are effectively evaluated.

[0005] The technical solution of the present invention is implemented as follows: a test method for an overload protection type viscous damper, the method comprising the following steps:

[0006] Using static loading test, control the loading unit of the testing machine to make the overload protection type viscous damper to be tested move at a constant speed, and record the limit displacement value of the reciprocating motion of the damper;

[0007] A total of four independent tests were set up, and the tests were carried out at three speed gears and corresponding test displacements. The test speed and test displacement in the first test were consistent with the parameter settings in the final test. The test displacement calibrated in the first test was ±0.8 times the design displacement, and the maximum output was detected during the test to obtain the first test output F1;

[0008] During the second test, the test speed is increased based on the first test, and the test displacement is calibrated to the design displacement. The maximum output is detected during the test to obtain the second test output F2;

[0009] In the third test, the test speed is further increased based on the second test, and the test displacement is calibrated to ±1.2 times the design displacement. The maximum processing is detected during the test to obtain the third test output F3;

[0010] During the fourth test, the test speed and test displacement are adjusted to the same parameters as those of the first test, and the maximum output is detected during the test to obtain the fourth test output F4;

[0011] After recording each test output, obtain the deviation value between the maximum output of the fourth test and the maximum output of the first test. If the deviation value is not greater than 15%, it is determined that the overload protection type viscous damper has passed the test; if the deviation value is greater than 15%, it is determined that the overload protection type viscous damper has failed the test.

[0012] This application document is based on the corresponding test method in Article 7.2.3.1 of "Building Energy Dissipation Damper" JG / T209-2012. By setting different test speeds and displacement conditions, four tests are carried out in sequence. The deviation between the fourth and first measured values ​​of the maximum output of the same sample should not be greater than 15%, that is, -15%≤(F4-F1) / F1≤15%; the average deviation of all samples of the same specification should be within 10%. In this way, the real stability and reliability of the mechanical performance of the shock-absorbing product after experiencing rare earthquakes (Vmax working conditions) and ultra-rare earthquakes (1.5*Vmax working conditions) can be scientifically and effectively evaluated.

[0013] This method adopts a strategy of four independent tests, which can more comprehensively evaluate the performance of overload protection viscous dampers compared with traditional single or double tests. This multiple test method can not only detect the performance of the damper under different working conditions, but also evaluate the stability and consistency of its performance. Secondly, this method cleverly sets three different speed gears and corresponding test displacements. This progressive test parameter setting can simulate the working state of the damper under different earthquake intensities, thereby more comprehensively evaluating its performance. In particular, in the third test, the displacement was increased to 1.2 times the design displacement, which effectively detected the overload protection function of the damper, which is an important aspect that is often overlooked in the prior art. This method determines whether the damper passes the test by comparing the deviation of the first and fourth test results. This innovative evaluation criterion not only considers the immediate performance of the damper, but also pays attention to its performance stability after multiple uses, providing an important reference for the long-term reliability of the damper. This method sets a 15% deviation threshold as the judgment criterion. This specific quantitative indicator makes the test results more objective and comparable. Finally, this method uses a static loading test, which has lower equipment requirements, simpler operation, and is easier to be widely used in actual engineering than a dynamic loading test. In general, this test method has comprehensively improved the performance evaluation level of overload protection viscous dampers through multiple tests, multi-parameter changes, and performance stability evaluation, providing more reliable and comprehensive technical support for engineering practice.

[0014] As a preferred implementation, after completing and recording each test output, obtain the deviation value between the maximum output of the second test and the maximum output of the third test. If the deviation value is not greater than 15%, the overload protection type viscous damper is determined to have passed the test. If the deviation value is greater than 15%, a warning mark is placed on the overload protection type viscous damper and the test is repeated twice.

[0015] As a preferred embodiment, after determining that the overload protection type viscous damper has passed the test, the sample data of the same specification is reviewed with the standard parameters. When the average deviation between the tested overload protection type viscous damper and the standard parameters is within the set threshold standard, the overload protection type viscous damper is determined to be qualified.

[0016] As a preferred implementation manner, the test speed during the third test is 1.5 times the test speed during the second test, and the test speed during the second test is 1.32 times the test speed during the first test.

[0017] As a preferred embodiment, during the first test and the fourth test, the test frequency of the loading unit of the testing machine is set to 0.362 Hz, during the second test, the test frequency is set to 0.478 Hz, and during the third test, the test frequency is set to 0.573 Hz.

[0018] As a preferred implementation, before testing, the damping coefficient of the overload protection type viscous damper to be tested is adjusted to 20 mm / kN.s, the damping index is set to 0.6, and the number of test turns is set to 3 turns.

[0019] After adopting the above technical scheme, the beneficial effect of the present invention is: by setting four independent tests and conducting them at different speed gears and displacements, the performance of the damper under various working conditions can be comprehensively evaluated to ensure its reliability and stability in practical applications. The static loading test and uniform motion control adopted in the method can accurately simulate the actual working state of the damper, improve the accuracy and representativeness of the test results, and by comparing the maximum output deviations of the first and fourth tests, the durability and consistency of the damper can be effectively evaluated to ensure its reliability in long-term use. Setting a deviation threshold of 15% as the judgment standard not only ensures the stability requirements of the damper performance, but also takes into account the reasonable error range in practical engineering applications. This method also simulates the performance of the damper under different working conditions by adjusting the test speed and displacement, which helps to fully understand its performance characteristics. The method is simple to operate, with clear steps, easy to implement and promote in actual detection, and can effectively improve detection efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 is a flow chart of the method of the present invention;

[0022] Figure 2 This is a test diagram of working condition 1 in an embodiment of the present invention;

[0023] Figure 3 This is a test diagram of working condition 2 in an embodiment of the present invention;

[0024] Figure 4 This is a test diagram of working condition 3 in an embodiment of the present invention;

[0025] Figure 5 This is a test diagram of working condition 4 in an embodiment of the present invention;

[0026] Figure 6 This is a test diagram of working condition 5 in an embodiment of the present invention;

[0027] Figure 7 This is a test diagram of working condition 6 in an embodiment of the present invention;

[0028] Figure 8 This is a test diagram of the regularity of the damping force in an embodiment of the present invention;

[0029] Fig. 9 It is a constitutive comparison diagram between the embodiment of the present invention and the ordinary damper. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example:

[0032] like Figures 1 to 9 As shown, a test method for an overload protection type viscous damper comprises the following steps:

[0033] Using static loading test, control the loading unit of the testing machine to make the overload protection type viscous damper to be tested move at a constant speed, and record the limit displacement value of the reciprocating motion of the damper;

[0034] A total of four independent tests were set up, and the tests were carried out at three speed gears and corresponding test displacements. The test speed and test displacement in the first test were consistent with the parameter settings in the final test. The test displacement calibrated in the first test was ±0.8 times the design displacement, and the maximum output was detected during the test to obtain the first test output F1;

[0035] During the second test, the test speed is increased based on the first test, and the test displacement is calibrated to the design displacement. The maximum output is detected during the test to obtain the second test output F2;

[0036] In the third test, the test speed is further increased based on the second test, and the test displacement is calibrated to ±1.2 times the design displacement. The maximum processing is detected during the test to obtain the third test output F3;

[0037] During the fourth test, the test speed and test displacement are adjusted to the same parameters as those of the first test, and the maximum output is detected during the test to obtain the fourth test output F4;

[0038] After recording each test output, obtain the deviation value between the maximum output of the fourth test and the maximum output of the first test. If the deviation value is not greater than 15%, it is determined that the overload protection type viscous damper has passed the test; if the deviation value is greater than 15%, it is determined that the overload protection type viscous damper has failed the test.

[0039] This test method for overload protection viscous dampers mainly evaluates the performance and stability of the damper through static loading tests. Its working principle is to control the loading unit to make the damper reciprocate under different speeds and displacements, record its maximum output, and judge whether the performance of the damper is stable and reliable by comparing the first and last test results. The specific workflow includes the following steps:

[0040] The main differences between this method and the prior art are:

[0041] Multiple tests with different parameters were conducted to comprehensively evaluate the performance of the damper under different working conditions. The stability of the damper performance was effectively evaluated by comparing the results of the first and last tests with the same parameters. Clear judgment criteria were set to make the test results more objective and reliable.

[0042] From the perspective of building shock absorption, this method has the following advantages: it comprehensively evaluates the performance of the damper under different speed and displacement conditions, which is closer to actual use; through multiple tests and comparisons, it effectively verifies the stability and reliability of the damper performance, ensuring that it can continue to play a shock absorption role in long-term use; it sets strict judgment standards to ensure that the damper that passes the test has good performance and can provide reliable shock absorption protection for the building; it takes into account the performance under overload conditions to ensure that the damper can still work normally under extreme conditions, thereby improving the overall seismic resistance of the building. In general, this detection method is comprehensive, strict, and reliable, and can effectively evaluate the performance of overload protection viscous dampers, providing more reliable protection for building shock absorption.

[0043] After completing and recording each test output, obtain the deviation between the maximum output of the second test and the maximum output of the third test. If the deviation is not greater than 15%, the overload protection type viscous damper is judged to have passed the test. If the deviation is greater than 15%, the overload protection type viscous damper is marked with a warning and the second test is repeated. By comparing the results of the second and third tests, the performance changes of the damper under different working conditions can be better evaluated, especially when the speed and displacement change greatly, which is crucial for evaluating the reliability of the damper in actual use. The warning mark and repeated detection mechanism improve the accuracy and fairness of the detection, avoid misjudgment due to accidental factors or temporary conditions, and also give manufacturers the opportunity to improve and optimize their products. This method is more in line with actual engineering needs, because in actual applications, dampers will face various complex working conditions and need to maintain stable performance under different conditions.

[0044] At present, the detection methods in the building shock absorption industry are often relatively simple and cannot fully evaluate the performance of the damper under complex working conditions. Some detection methods only focus on the performance under a single parameter or fixed working conditions, ignoring the performance of the damper under different conditions. The existing detection methods lack sufficient flexibility and fault tolerance mechanisms, which can easily lead to misjudgments or overly strict judgments. The uniformity and standardization of detection standards in the industry need to be improved. Therefore, the introduction of this new detection method can not only improve the accuracy and reliability of detection, but also promote the entire industry to develop in a more scientific and rigorous direction, and ultimately improve the overall performance and safety of the building shock absorption system.

[0045] The damping force regularity test results in this application document are shown in Table 1:

[0046]

[0047] Table 1 Damping force regularity test results

[0048] After determining that the overload protection type viscous damper has passed the test, the sample data of the same specification will be reviewed with the standard parameters. When the average deviation between the tested overload protection type viscous damper and the standard parameters is within the set threshold standard, the overload protection type viscous damper is determined to be qualified.

[0049] The test conditions in the specific test are as follows:

[0050] like Figure 2 The working condition 1 shown is a test diagram with a test speed of 63.7 mm / s and an actual output of 246 kN;

[0051] like Figure 3 The working condition 2 shown is a test diagram with a test speed of 91 mm / s and an actual output of 287 kN;

[0052] like Figure 4 The working condition 3 shown is a test diagram with a test speed of 120 mm / s and an actual output of 299 kN;

[0053] like Figure 5 The working condition 4 shown is a test diagram with a test speed of 143 mm / s and an actual output of 301 kN;

[0054] like Figure 6 The working condition 5 shown is a test diagram with a test speed of 180 mm / s and an actual output of 313 kN;

[0055] like Figure 7 The working condition 6 shown is a test diagram with a test speed of 214.5 mm / s and an actual output of 317 kN;

[0056] Will Figures 2 to 7 Integrate the test conditions to obtain Figure 8 The damping force regularity test diagram shown in FIG. 1 shows the working effect of the damper tested in this application document within the set range. If the ordinary damper is not protected against overload, Fig. 9 As shown, it will greatly exceed the set threshold, which will cause the damper to deform. However, because the damper in this application document adopts overload protection, it can only bear the pressure of the set threshold. After exceeding the threshold, the damper will not work and will not bear pressure exceeding the set threshold. In this way, when designing a building, designers can have sufficient data to make detailed adjustments.

[0057] The main difference between this detection method and the existing technology is that it introduces the verification step of sample data with the same specifications and standard parameters, as well as the qualified judgment mechanism based on the average deviation. The specific differences include:

[0058] After a single damper passes the test, it needs to be compared with the data of samples of the same specification. This practice increases the comprehensiveness and reliability of the test. The introduction of standard parameters as a reference benchmark makes the test results more comparable and consistent. The use of the average deviation as the basis for judgment, rather than a single data point, can better reflect the overall performance of the damper. Threshold standards are set to provide clear quantitative indicators for qualified judgments.

[0059] The reasons and benefits of this setting are mainly reflected in the following aspects: By comparing with the data of samples of the same specifications, the influence of individual differences can be effectively eliminated, ensuring the representativeness and reliability of the test results. Secondly, the introduction of standard parameters as a reference benchmark is conducive to establishing a unified evaluation standard and improving the comparability between dampers produced by different batches and different manufacturers. Using the average deviation as the basis for judgment can more comprehensively reflect the overall performance of the damper and avoid the accidental error caused by a single data point. Finally, setting a clear threshold standard makes the qualified judgment more objective and quantitative, reducing the influence of subjective factors.

[0060] At present, according to the requirements of Article 3.1.5 of the Technical Code for Energy Dissipation and Shock Reduction of Buildings JGJ 297-2013: "In order to prevent the damper from causing adverse effects on the structure, the support system and connection nodes should be protected so that they will not be damaged before the structure due to excessive damping force, and the damping force of the damper should be controlled during rare earthquakes." Therefore, it is required that the deviation between the third and second measured values ​​of the maximum output of the same sample should not be greater than 15%, that is, -15%≤(F3-F2) / F2≤15%, and the average deviation of all samples of the same specification should be within 10%. There are some shortcomings in the testing methods of the building shock absorption industry: the testing methods are too simplistic, focusing only on the performance under a single parameter or a single working condition, and cannot fully reflect the performance of the damper in actual use. The judgment of the test results is too dependent on a single data point and is easily affected by accidental factors. The lack of consideration of the overall performance of products of the same specification has led to individual unqualified products being mistakenly judged as qualified. The introduction of this new testing method can not only improve the accuracy, reliability and comparability of the test, but also promote the entire industry to develop in a more standardized direction. It helps to improve the overall quality of damper products, enhance the reliability and safety of building shock absorption systems, and ultimately provide better earthquake protection for buildings. At the same time, this method also provides manufacturers with clearer quality control indicators, which is conducive to the continuous improvement and optimization of products.

[0061] The test speed of the third test is 1.5 times that of the second test, and the test speed of the second test is 1.32 times that of the first test. The reasons and benefits of this setting are mainly reflected in the following aspects:

[0062] By precisely controlling the speed increase ratio, the performance changes of the damper under different speed conditions can be evaluated more systematically, which helps to fully understand the dynamic characteristics of the damper. The nonlinear speed increase method is closer to the actual earthquake condition, because the frequency and intensity of seismic waves usually do not change linearly. The speed increase ratios of 1.32 times and 1.5 times are determined based on the critical point or sensitive range of the damper performance change, which helps to capture the key changes in the damper performance. This precise speed control helps to establish a standardized test process and improve the comparability and consistency between different tests.

[0063] There are some problems with the test methods in the building shock absorption industry: some test methods use fixed speed or simple linear speed changes, which cannot fully reflect the performance of the damper under complex dynamic conditions. The selection of test speed lacks theoretical basis or support from practical engineering experience, resulting in differences between the test results and actual use. Different manufacturers or test institutions use different speed setting methods, which makes it difficult to compare the test results horizontally. Some test methods are oversimplified and ignore the important impact of speed changes on damper performance. The lack of evaluation of the performance of dampers under rapidly changing dynamic conditions leads to unexpected situations in actual use. The introduction of this new test method can not only improve the scientificity and reliability of the test, but also better simulate the working state of the damper under actual earthquake conditions. It helps to more accurately evaluate the dynamic performance of the damper and improve the overall effect of the building shock absorption system. At the same time, this standardized test method also provides a unified reference standard for the industry, which is conducive to improving the consistency and comparability of product quality. This method can also help researchers and engineers gain a deeper understanding of the performance characteristics of dampers. In general, this testing method of precisely controlling speed represents the trend of the industry towards a more refined, scientific and standardized direction, and is expected to promote technological progress and quality improvement in the entire building shock absorption industry.

[0064] During the first and fourth tests, the test frequency of the loading unit of the test machine was set to 0.362Hz, during the second test, the test frequency was set to 0.478Hz, and during the third test, the test frequency was set to 0.573Hz. Non-integer frequency values ​​were used instead of the common integer or simple fractional frequencies. The frequency increase is not a simple arithmetic or geometric relationship, but a carefully designed specific value. The same frequency was used for the first and fourth tests, forming a complete test cycle.

[0065] The reasons and benefits of this setting are mainly reflected in the following aspects: By precisely controlling the frequency, the performance changes of the damper under different vibration conditions can be evaluated more carefully, which helps to fully understand the dynamic characteristics of the damper. Non-integer frequency values ​​are closer to the frequency characteristics of actual seismic waves, because the frequency of natural earthquakes is usually not a simple integer value. The specific frequency setting is based on a large amount of experimental data and theoretical analysis, and specifically covers the key frequency range of damper performance. The same frequency is used for the first and last tests, which can effectively evaluate the performance stability and consistency of the damper after different frequency tests. The current test method uses a fixed frequency or a simple frequency change mode, which cannot fully reflect the performance of the damper under complex vibration conditions. The selection of the test frequency lacks sufficient theoretical basis or practical engineering experience support, resulting in differences between the test results and actual use. Some test methods are overly simplified and ignore the important impact of frequency changes on damper performance. The lack of a comprehensive evaluation of the performance of the damper under wide-band conditions leads to unexpected situations in actual use.

[0066] Before the test, the damping coefficient of the overload protection viscous damper to be tested is adjusted to 20mm / kN.s, the damping index is set to 0.6, and the number of test turns is set to 3 turns. The main difference between this test method and the prior art lies in the precise presetting and control of the test parameters. The specific differences include: the damping coefficient of the damper is clearly specified and set to 20mm / kN.s, which is an accurate value, not a range or approximate value. The damping index is clearly set to 0.6, which is an important parameter of nonlinear damping characteristics. The number of test turns is set to 3 turns, which is based on statistical and reliability theory considerations. This precise parameter presetting is more rigorous and scientific than the prior art. Traditional test methods only focus on certain parameters or use a relatively wide range of parameters, while this method accurately controls all key parameters. In particular, the precise setting of the damping coefficient and damping index reflects the in-depth understanding and attention to the nonlinear characteristics of the damper. This approach helps to ensure the consistency and comparability of the test results, and also provides a more reliable basis for evaluating the performance of the damper under specific working conditions. In addition, the three-circle test setting is to ensure the adequacy of the test while taking into account the test efficiency and cost considerations. This precise parameter preset and control reflects the trend of the industry towards more refinement and standardization, which is conducive to improving the scientificity and reliability of the test, and also provides a unified comparison benchmark for products from different manufacturers and batches.

[0067] In actual operation, the detection conditions of the overload protection damper are shown in Table 2 below:

[0068]

[0069] Table 2 Testing conditions of overload protection damper

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A test method for an overload protection type viscous damper, characterized in that: The method comprises the following steps: Using static loading test, control the loading unit of the testing machine to make the overload protection type viscous damper to be tested move at a constant speed, and record the limit displacement value of the reciprocating motion of the damper; A total of four independent tests were set up, and the tests were carried out at three speed gears and corresponding test displacements. The test speed and test displacement in the first test were consistent with the parameter settings in the final test. The test displacement calibrated in the first test was ±0.8 times the design displacement, and the maximum output was detected during the test to obtain the first test output F1; During the second test, the test speed is increased based on the first test, and the test displacement is calibrated to the design displacement. The maximum output is detected during the test to obtain the second test output F2; In the third test, the test speed is further increased based on the second test, and the test displacement is calibrated to ±1.2 times the design displacement. The maximum output is detected during the test to obtain the third test output F3; During the fourth test, the test speed and test displacement are adjusted to the same parameters as those of the first test, and the maximum output is detected during the test to obtain the fourth test output F4; After recording each test output, obtain the deviation value between the maximum output of the fourth test and the maximum output of the first test. If the deviation value is not greater than 15%, it is determined that the overload protection type viscous damper has passed the test; if the deviation value is greater than 15%, it is determined that the overload protection type viscous damper has failed the test.

2. A test method for an overload protection type viscous damper according to claim 1, characterized in that: After completing and recording each test output, obtain the deviation between the maximum output of the second test and the maximum output of the third test. If the deviation is not greater than 15%, the overload protection type viscous damper is judged to have passed the test. If the deviation is greater than 15%, a warning mark is placed on the overload protection type viscous damper and the test is repeated twice.

3. A test method for an overload protection type viscous damper according to claim 1, characterized in that: After determining that the overload protection type viscous damper has passed the test, the sample data of the same specification will be reviewed with the standard parameters. When the average deviation between the tested overload protection type viscous damper and the standard parameters is within the set threshold standard, the overload protection type viscous damper is determined to be qualified.

4. A test method for an overload protection type viscous damper according to claim 1, characterized in that: The test speed during the third test is 1.5 times the test speed during the second test, and the test speed during the second test is 1.32 times the test speed during the first test.

5. The test method for an overload protection type viscous damper according to claim 1, characterized in that: During the first and fourth tests, the test frequency of the loading unit of the testing machine was set to 0.362 Hz, during the second test, the test frequency was set to 0.478 Hz, and during the third test, the test frequency was set to 0.573 Hz.

6. A test method for an overload protection type viscous damper according to claim 1, characterized in that: Before the test, the damping coefficient of the overload protection viscous damper to be tested was adjusted to 20 kN.s / mm, the damping index was set to 0.6, and the number of test turns was set to 3 turns.

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