Beam-arch combination damping structure and damping method thereof

Abstract

The application relates to the field of bridge anti-seismic, and particularly discloses a beam-arch combination damping structure, which comprises an upper support body, a first strain gauge embedded in the lower surface of the upper support body, a cylinder body, damping liquid filled in the cylinder body, a first piezoelectric ceramic sensor embedded in the bottom of the cylinder body and in contact with the damping liquid, a piston in sliding connection with the cylinder body, a plurality of through holes penetrating through both ends of the piston and arranged in the piston, an electromagnetic valve arranged in each through hole and used for controlling the opening and closing of the through hole, a second piezoelectric ceramic sensor embedded in the piston and in contact with the damping liquid, a piston rod, one end of the piston rod extending into the cylinder body and fixedly connected with the end of the piston, the other end of the piston rod fixedly connected with the upper support body, and both ends of the first strain gauge fixedly connected with the piston rod and the upper support body. The technical scheme can effectively distinguish normal load and abnormal load, can adjust the pull force of the abutment according to the actual situation, and can adjust the damping force according to the viscosity of the damping liquid.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge vibration resistance, in particular to a beam-arch combination vibration reduction structure and a vibration reduction method thereof. BACKGROUND

[0002] With the continuous increase of bridge span, the continuous innovation of bridge type, and the continuous development of driving vehicles towards high speed and heavy load, the vehicle-bridge coupling vibration problem of highway bridges is becoming increasingly prominent due to the increasing traffic flow and the increasing number of lanes. The beam-arch combination bridge is a special bridge with reasonable structural stress, beautiful and novel appearance, which is a development of the traditional arch bridge. This bridge type organically combines the large-span continuous beam and arch structural systems, and the two systems cooperatively transmit the load in the span range to the support, which is a bridge structural system that combines the advantages of the arch bridge, such as large structural stiffness, large bearing potential, high material utilization rate, and the advantages of the beam bridge, such as economical construction cost and good structural bending resistance. As a new type of structure, the beam-arch combination is not only widely used in highway bridges, but also increasingly favored by designers in urban bridges due to its beautiful appearance.

[0003] However, according to existing research, the bridge type will produce strong vehicle-bridge-wind-seismic coupling effect during use due to the long-term influence of earthquakes, wind loads and vehicle reciprocating action, and will produce adverse dynamic responses of the overall structure, such as deflection, strain, bending moment, and suspender force, in three-dimensional space. Based on the consideration of vibration reduction and seismic resistance, a reasonable vibration reduction structure is often added in advance during the design and construction of the beam-arch combination bridge.

[0004] The common vibration reduction structure is mainly realized by viscous dampers. For example, the document with the Chinese patent publication number CN216973079 U discloses an anti-seismic system for deck beam-arch combination bridges in high seismic intensity areas, which includes an upper beam body, a support and an abutment. The support is located between the upper beam body and the abutment, and the upper beam body is supported on the abutment through the support. The deck beam-arch combination bridge further includes a viscous damper, one end of which is connected to the abutment, and the other end of which is connected to the upper beam body. By setting the viscous damper between the abutment and the upper beam body, the viscous damper can maximize the absorption and consumption of the impact energy of the earthquake on the bridge, greatly relieving the impact and damage of the earthquake on the deck beam-arch combination bridge, and further reducing the adverse effects of the earthquake on the bridge. Moreover, the viscous damper can improve the stress condition of the pier, so that the reduction of the middle pier stiffness to improve the seismic performance can meet the bearing capacity demand of the pier foundation, and the reduction of the middle pier stiffness can greatly reduce the number of pier foundation engineering and improve the economy of the bridge.

[0005] For different application scenarios, the specific structure of the viscous damper will be optimized, such as the document with Chinese patent publication number CN 103671677 A, which discloses a viscous damper, including a cylinder body, a cylinder cover, a piston rod, a piston head, a guide sleeve, a seal and a viscous damping liquid, the cylinder body and the cylinder cover form a damping cavity, the piston head separates the damping cavity into a first damping chamber and a second damping chamber, a two-way lock valve is installed on the piston head, and the two ends of the two-way lock valve are connected with the first damping chamber and the second damping chamber respectively. The document claims that the provided viscous damper, by installing a two-way lock valve on the piston head, when the viscous damper is greater than the critical speed, the force acting on the lock valve core is greater than the pre-pressing force of the spring, so the lock valve is closed, thereby making the output damping force of the viscous damper reach the rated value. In addition, the device has compact structure, convenient installation, and can realize the locking function in two directions.

[0006] The viscous damper mainly absorbs and consumes the impact energy of the beam-arch combined system caused by earthquakes (or other vibrations), and converts it into heat, thereby relieving the impact and damage of the beam-arch combined system bridge caused by earthquakes (or other vibrations). In the above device, when the force acting on the lock valve core during abnormal vibration is greater than the pre-pressing force of the spring, the lock valve is closed, which realizes that the output damping force of the viscous damper can be increased during abnormal vibration (exceeding normal), and realizes the adjustment of the size of the two damping forces (i.e. normal mode and abnormal mode).

[0007] In actual application process, if only ordinary viscous damper is used, it cannot distinguish the vibration caused by vehicles during normal operation of the beam-arch combined system, causing the viscous damper to be in a high-pressure working state for a long time; and under the reciprocating action of normal load (vibration caused by vehicles passing by), the abutment repeatedly bears the pulling force and pushing force from the main beam. However, the abutment structure can bear the pushing force, but cannot bear the large pulling force under the action of normal load, so this design also easily damages the abutment; in addition, due to the long-term use of the viscous damper, the viscosity of the damping liquid inside will change, and the existing viscous damper cannot adjust the size of the damping force according to the viscosity of the damping liquid. Based on the above reasons, there is an urgent need for a beam-arch combined system damping structure and damping method which can effectively distinguish normal load and abnormal load, adjust the pulling force on the abutment according to actual conditions, and adjust the size of the damping force according to the viscosity of the damping liquid. SUMMARY

[0008] The present application provides a beam-arch combined system damping structure and damping method which can effectively distinguish normal load and abnormal load, adjust the pulling force on the abutment according to actual conditions, and adjust the size of the damping force according to the viscosity of the damping liquid.

[0009] In order to solve the above technical problems, the present application provides the following technical solutions:

[0010] A beam-arch combination damping structure, comprising:

[0011] An upper support body, a lower surface of the upper support body embedded with a first strain gauge;

[0012] A cylinder, the cylinder filled with damping liquid, a bottom of the cylinder embedded with a first piezoelectric ceramic sensor in contact with the damping liquid;

[0013] A piston, the piston in sliding connection with the cylinder, a plurality of through holes penetrating both ends of the piston formed on the piston, an electromagnetic valve for controlling opening and closing of the through holes respectively arranged in the through holes, a second piezoelectric ceramic sensor in contact with the damping liquid embedded on the piston;

[0014] A piston rod, one end of the piston rod extending into the cylinder and fixedly connected with an end of the piston, the other end of the piston rod fixedly connected with the upper support body, both ends of the first strain gauge respectively fixedly connected with the piston rod and the upper support body;

[0015] A lower support body, an upper surface of the lower support body embedded with a second strain gauge, the bottom of the cylinder fixedly connected with the lower support body, both ends of the second strain gauge respectively fixedly connected with the cylinder and the lower support body;

[0016] A controller, the controller in signal connection with the first strain gauge, the second strain gauge, the first piezoelectric ceramic sensor, the second piezoelectric ceramic sensor and the electromagnetic valves respectively;

[0017] The controller is configured to determine whether the load is normal or abnormal according to a peak value of compression deformation of the first strain gauge and the second strain gauge, if the load is normal, then according to a deformation frequency of the first strain gauge and the second strain gauge, periodically control some of the electromagnetic valves to open when the first strain gauge and the second strain gauge change from compression to tension, and control some of the electromagnetic valves to close when the first strain gauge and the second strain gauge change from tension to compression, if the load is abnormal, then control all of the electromagnetic valves to open, the controller is further configured to compare a difference between parameters of the first strain gauge and the second strain gauge and the first piezoelectric ceramic sensor and the second piezoelectric ceramic sensor with a preset difference, determine a viscosity of the damping liquid, and according to a corresponding relationship between the viscosity of the damping liquid and a preset number of opened electromagnetic valves, determine a number of the electromagnetic valves to be periodically opened when the first strain gauge and the second strain gauge change from compression to tension.

[0018] The basic principle and beneficial effects of the scheme are as follows: During use, the upper support is fixed to the upper beam of the beam-arch composite system, and the lower support is fixed to the abutment of the beam-arch composite system. When the upper beam vibrates, it will compress or stretch the first and second strain gauges. During this process, the amplitude and frequency of the vibration can be known by acquiring the deformation parameters of the first and second strain gauges. Then, the controller judges the corresponding parameters. Under normal use, the amplitude and frequency of the vibration are within the preset range (of course, some through holes can be kept in a normally open state to ensure the normal function of the vibration damping structure). At this time, it is necessary to reduce the tensile impact on the abutment. At this time, by controlling the number of through holes on the piston in the cylinder, the damping coefficient of compression or stretching can be adjusted. That is, when compressing, the number of through holes is small, and the abutment can withstand greater pressure; when stretching, the number of through holes is large, and gravity is used to attenuate the tensile force, prolonging the duration of the tensile force and reducing the instantaneous amount of the tensile force, thereby reducing the impact of the tensile force on the abutment.

[0019] In this solution, the controller compares the differences in parameters between the first and second strain gauges and the first and second piezoelectric ceramic sensors with preset differences to determine the viscosity of the damping fluid. It then establishes a correlation between the damping fluid viscosity and a preset number of solenoid valves that open. This ensures that even after the damping fluid has degraded, the overall vibration damping structure continues to operate according to the design parameters. The change in the number of through-holes compensates for changes in the damping fluid viscosity, extending the overall service life.

[0020] In summary, this solution can effectively distinguish between normal and abnormal loads by judging the deformation amplitude of the first and second strain gauges; by controlling the frequency of the first and second strain gauges and controlling the number of flow holes with the same period, the tension on the bridge abutment is reduced; and by controlling the number of flow holes each time, the influence of the viscosity change of the damping fluid on the magnitude of the damping force can be compensated.

[0021] Furthermore, the structures of the flow paths formed by the through holes are all different.

[0022] This approach can enhance the influence of each through-hole on the damping force, allowing for more adjustment combinations.

[0023] Further, the wireless communication module is further included, the cylinder is provided with a power supply coil, the side surface of the piston rod is provided with a permanent magnet, the power supply coil is connected with a power conversion module for providing power supply for the storage battery, and the power conversion module is electrically connected with the controller; the controller is further used for comparing the power conversion parameters of the power conversion module with the deformation frequencies of the first strain gauge and the second strain gauge, and generating an alarm instruction if the corresponding relationship of the two exceeds a preset range; and the wireless communication module is used for receiving and sending the alarm instruction to a preset address.

[0024] In this way, on the one hand, vibration power generation and power supply can be utilized; on the other hand, the working state of the first strain gauge and the second strain gauge can be monitored, so as to avoid the loss caused by the failure of the first strain gauge and the second strain gauge.

[0025] Further, an emergency heat sink is further included, the emergency heat sink is fixed to the side wall of the cylinder, the emergency heat sink is loaded with a cooling liquid for cooling the cylinder, the bottom of the emergency heat sink is provided with a heat dissipation electromagnetic valve, and the cylinder is provided with a temperature sensor; the heat dissipation electromagnetic valve and the temperature sensor are respectively signal-connected with the controller; the controller is further used for receiving the cylinder temperature information detected by the temperature sensor, and controlling the heat dissipation electromagnetic valve to be opened when the cylinder temperature information exceeds a preset threshold value.

[0026] Such a design can better ensure the temperature of the cylinder and avoid the thermal failure of the damping liquid.

[0027] Further, the upper support body and the lower support body are respectively provided with mounting counterbores for accommodating the first strain gauge and the second strain gauge.

[0028] Such a design can more conveniently install the first strain gauge and the second strain gauge.

[0029] Further, the preset difference between the parameters of the first strain gauge and the second strain gauge and the first piezoelectric ceramic sensor and the second piezoelectric ceramic sensor is determined according to a propagation equation of a pressure wave in the damping liquid; the propagation equation is expressed as: the greater the viscosity of the damping liquid, the greater the energy dissipation of the pressure wave in the damping liquid, and the smaller the amplitude of the received signal and the viscosity change index; the greater the frequency of the pressure wave, the faster the energy attenuation of the pressure wave in the damping liquid; the greater the propagation distance of the pressure wave in the damping liquid, the greater the energy dissipation in the propagation process, and the smaller the amplitude of the signal received by the piezoelectric ceramic sensor; the amplitude and frequency of the pressure wave can be determined by the deformation amount and amplitude of the first strain gauge and the second strain gauge.

[0030] In this way, the viscosity parameter of the damping liquid can be more accurately obtained.

[0031] Further, the pressure deformation peak value measured by the first strain gauge is the highest voltage value in time t, denoted as U x, the deformation frequency of the first strain gauge is the vibration frequency within time t, denoted as f x , the peak value of the deformation under pressure measured by the second strain gauge is the highest voltage value within time t, denoted as U y , the deformation frequency of the second strain gauge is the vibration frequency within time t, denoted as f y ;

[0032] The peak value of the deformation under pressure measured by the first piezoelectric ceramic sensor is the highest voltage value within time t, denoted as U a , the deformation frequency of the first piezoelectric ceramic sensor is the vibration frequency within time t, denoted as f a , the peak value of the deformation under pressure measured by the second piezoelectric ceramic sensor is the highest voltage value within time t, denoted as U b , the deformation frequency of the second piezoelectric ceramic sensor is the vibration frequency within time t, denoted as f b ;

[0033] The preset difference value is denoted as C1=(U x *f x +U y *f y ) / (U a *f a +U b *f b )

[0034] The viscosity of the damping liquid is expressed as,

[0035] The correlation between the number of open electromagnetic valves and the viscosity of the damping liquid is S=((μ-μ0) / μ) / 10%, wherein μ0 is a preset value, and S is rounded up.

[0036] The above method is more of an empirical formula, which can combine the piezoelectric effect of the first strain gauge, the second strain gauge, the first piezoelectric ceramic sensor, and the second piezoelectric ceramic sensor, the transmission and attenuation effect of the pressure wave in the damping liquid, and the number of open electromagnetic valves and through holes, and is fitted out through an empirical formula, which has good practicability in certain scenarios.

[0037] A beam-arch combination method, comprising the following contents:

[0038] S1 vibration parameter acquisition step, the deformation parameters of the upper beam body of the beam-arch combination and the contact position of the abutment and the damping structure are collected by the first strain gauge and the second strain gauge respectively, and the deformation parameters include deformation amplitude and deformation frequency;

[0039] S2 damping liquid viscosity parameter acquisition step, according to the difference between the parameters of the first strain gauge, the second strain gauge, the first piezoelectric ceramic sensor and the second piezoelectric ceramic sensor, and the preset difference value, the viscosity of the damping liquid is determined.

[0040] S3 damping coefficient compensation parameter determination step, according to the corresponding relationship between the viscosity of the damping liquid and the preset number of electromagnetic valve opening, the number of electromagnetic valve periodically opened when the first strain gauge and the second strain gauge change from compression to tension is determined;

[0041] S4 damping coefficient compensation parameter adjustment step, according to the compression deformation peak value of the first strain gauge and the second strain gauge, it is judged whether it is normal load or abnormal load, if it is normal load, then according to the deformation frequency of the first strain gauge and the second strain gauge, the corresponding number of electromagnetic valve is periodically controlled to open when changing from compression to tension, and the corresponding number of electromagnetic valve is controlled to close when changing from tension to compression; If it is abnormal load, then control all electromagnetic valves to open.

[0042] In the above method, by judging the deformation amplitude of the first strain gauge and the second strain gauge, the normal load and the abnormal load can be effectively distinguished; By controlling the frequency of the first strain gauge and the second strain gauge, and controlling the number of through holes flowing at the same period, the effect of reducing the abutment tension is realized; By controlling the number of through holes flowing each time, the influence of the viscosity change of the damping liquid on the damping force can be compensated. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 It is a partial sectional view of a beam arch combination damping structure embodiment 1;

[0044] Figure 2 It is a step flow chart of a beam arch combination damping method in embodiment 1. DETAILED DESCRIPTION

[0045] The following will be further described in detail through specific embodiments:

[0046] The marks in the drawings of the specification include: upper beam body 10, abutment 11, upper support body 20, lower support body 30, first strain gauge 21, second strain gauge 31, piston 40, piston rod 50, electromagnetic valve 51, first piezoelectric ceramic sensor 60, second piezoelectric ceramic sensor 61.

[0047] Embodiment 1

[0048] A beam arch combination damping structure (as shown in Figure 1 It includes:

[0049] The lower surface of the upper support body 20 is embedded with the first strain gauge 21 (the model of the optional specification is more, and the waterproof strain gauge with sensitive grid length of 10 mm and resistance of 100 Ω is selected in this embodiment);

[0050] Cylinder, the cylinder is filled with damping liquid, the bottom of the cylinder is embedded with the first piezoelectric ceramic sensor 60 in contact with the damping liquid (the piezoelectric ceramic sensor can be selected according to the actual working condition, and the temperature and range are suitable, more stable, and the HTYY320B is selected in the embodiment, and the protection device is added to realize detection);

[0051] Piston 40, the piston 40 is in sliding connection (and sealing) with the cylinder, four through holes (one is always open, one is opened under pressure, one is opened under tension, and one is opened for viscosity compensation of the damping liquid, and the number is only for easy understanding, and the actual number can be set according to the actual situation) are formed in the piston 40 and extend through both ends of the piston 40, the through holes are respectively provided with electromagnetic valves 51 for controlling the opening and closing of the through holes, the second piezoelectric ceramic sensor 61 is embedded on the piston 40 and in contact with the damping liquid, and the flow paths formed by the through holes are different in structure;

[0052] Piston rod 50, one end of the piston rod 50 extends into the cylinder and is welded and fixed with the end of the piston 40, the other end of the piston rod 50 is welded and fixed with the upper support 20, and the two ends of the first strain gauge 21 are respectively bonded and fixed with the piston rod 50 and the upper support 20;

[0053] Lower support 30, the upper surface of the lower support 30 is embedded with the second strain gauge 31, the bottom of the cylinder is welded and fixed with the lower support 30, and the two ends of the second strain gauge 31 are respectively bonded and fixed with the cylinder and the lower support 30;

[0054] Controller (it can be realized by STC series single-chip microcomputer), the controller is respectively connected with the first strain gauge 21, the second strain gauge 31, the first piezoelectric ceramic sensor 60, the second piezoelectric ceramic sensor 61 and the electromagnetic valve 51 (of course, according to the actual situation, AD module can also be added between the first strain gauge 21, the second strain gauge 31, the first piezoelectric ceramic sensor 60 and the second piezoelectric ceramic sensor 61 to facilitate the controller to read the relevant information, and the controller selected in the embodiment is provided with AD module, and the corresponding information can be directly read);

[0055] The upper support body 20 and the lower support body 30 are respectively provided with mounting counterbores for accommodating the first strain gauge 21 and the second strain gauge 31, and the controller is used for judging whether it is a normal load or an abnormal load according to the peak value of the compression deformation of the first strain gauge 21 and the second strain gauge 31, if it is a normal load, then according to the deformation frequency of the first strain gauge 21 and the second strain gauge 31, the partial electromagnetic valve 51 is periodically controlled to be opened when changing from compression to tension, and the partial electromagnetic valve 51 is controlled to be closed when changing from tension to compression; if it is an abnormal load, then all electromagnetic valves 51 are controlled to be opened; the controller is also used for comparing the difference between the parameters of the first strain gauge 21 and the second strain gauge 31 and the second piezoelectric ceramic sensor 61 with a preset difference value, determining the viscosity of the damping liquid, and according to the corresponding relationship between the viscosity of the damping liquid and the opening number of the electromagnetic valve 51, determining the number of electromagnetic valves 51 periodically opened when the first strain gauge 21 and the second strain gauge 31 change from compression to tension;

[0056] The cylinder body is provided with a power supply coil, the side surface of the piston rod 50 is provided with a permanent magnet, the power supply coil is connected with a power conversion module for providing power supply for the storage battery, and the power conversion module is electrically connected with the controller; the controller is also used for comparing the power conversion parameters of the power conversion module with the deformation frequency of the first strain gauge 21 and the second strain gauge 31, and if the corresponding relationship between the two exceeds a preset range, an alarm instruction is generated; the wireless communication module is used for receiving and sending the alarm instruction to a preset address.

[0057] Specifically, the preset difference between the parameters of the first strain gauge 21 and the second strain gauge 31 and the second piezoelectric ceramic sensor 61 is determined according to the propagation equation of the pressure wave in the damping liquid; the expression of the propagation equation is that the greater the viscosity of the damping liquid, the greater the energy dissipation of the pressure wave in the damping liquid, and the smaller the amplitude of the received signal and the viscosity change index; the greater the frequency of the pressure wave, the faster the energy attenuation of the pressure wave in the damping liquid; the greater the propagation distance of the pressure wave in the damping liquid, the greater the energy dissipation in the propagation process, and the smaller the amplitude of the signal received by the piezoelectric ceramic sensor; the amplitude and frequency of the pressure wave can be determined by the deformation amount and amplitude of the first strain gauge 21 and the second strain gauge 31.

[0058] In use, the upper support body 20 is fixed to the upper beam body 10 of the beam-arch combined system, and the lower support body 30 is fixed to the abutment 11 of the beam-arch combined system. When the upper beam body 10 vibrates, the first strain gauge 21 and the second strain gauge 31 are subjected to extrusion or stretching. The deformation parameters of the first strain gauge 21 and the second strain gauge 31 can be obtained to determine the amplitude and frequency of the vibration. The controller can determine the corresponding parameters. In normal use, the amplitude and frequency of the vibration are within the preset range (of course, some of the through holes can be kept in the open state to ensure the normal function of the damping structure). At this time, the tension impact on the abutment 11 needs to be reduced. The number of the through holes in the piston 40 can be controlled to adjust the damping coefficient of the extrusion or stretching. That is, when the pressure is applied, the number of the through holes is small, and the abutment 11 can withstand a larger pressure; when the tension is applied, the number of the through holes is large, and the gravity can be used to attenuate the tension, prolong the time of the tension, and reduce the instantaneous effect of the tension, thereby reducing the influence of the tension on the abutment 11.

[0059] In this embodiment, the number of the open through holes is one to realize the damping function of the foundation; when the pressure is applied, one through hole can be controlled to be opened (of course, the through hole can not be opened in other embodiments); when the tension is applied, another through hole is opened; when the viscosity of the damping liquid changes (in this embodiment, the viscosity increases, and in other embodiments, if the viscosity decreases, the through hole needs to be closed), another through hole is opened. The number of the open through holes can be designed according to the actual situation.

[0060] This embodiment also discloses a damping method for a beam-arch combined system (as shown in Figure 2 The damping method comprises the following steps.

[0061] S1, a vibration parameter acquisition step, in which deformation parameters of the upper beam body 10 and the abutment 11 of the beam-arch combined system at the contact positions with the damping structure are respectively acquired by the first strain gauge 21 and the second strain gauge 31, and the deformation parameters include a deformation amplitude and a deformation frequency;

[0062] S2, a damping liquid viscosity parameter acquisition step, in which the viscosity of the damping liquid is determined by comparing the difference between the parameters of the first strain gauge 21 and the second strain gauge 31 and the first piezoelectric ceramic sensor 60 and the second piezoelectric ceramic sensor 61 with a preset difference value;

[0063] S3, a damping coefficient compensation parameter determination step, in which the number of the electromagnetic valves 51 that are periodically opened when the first strain gauge 21 and the second strain gauge 31 change from the pressure state to the tension state is determined according to the correspondence between the viscosity of the damping liquid and the number of the open electromagnetic valves 51;

[0064] S4 damping coefficient compensation parameter adjustment step, according to the first strain gauge 21 and the second strain gauge 31 pressure deformation peak, judge is normal load or abnormal load, if normal load, then according to the first strain gauge 21 and the second strain gauge 31 deformation frequency, in the periodic control corresponding number of electromagnetic valve 51 open when the pressure changes to tensile state, and in the first strain gauge 21 and the second strain gauge 31 by tensile changes to pressure state control corresponding number of electromagnetic valve 51 close; If it is abnormal load, then control all electromagnetic valve 51 open.

[0065] Specifically, the first strain gauge measured pressure deformation peak value is the highest voltage value in time t, recorded as U x , the deformation frequency of the first strain gauge is the vibration frequency in time t, recorded as f x , the second strain gauge measured pressure deformation peak value is the highest voltage value in time t, recorded as U y , the deformation frequency of the second strain gauge is the vibration frequency in time t, recorded as f y ;

[0066] The first piezoelectric ceramic sensor measured pressure deformation peak value is the highest voltage value in time t, recorded as U a , the deformation frequency of the first piezoelectric ceramic sensor is the vibration frequency in time t, recorded as f a , the second piezoelectric ceramic sensor measured pressure deformation peak value is the highest voltage value in time t, recorded as U b , the deformation frequency of the second piezoelectric ceramic sensor is the vibration frequency in time t, recorded as f b ;

[0067] The preset difference is recorded as C1=(U x *f x +U y *f y ) / (U a *f a +U b *f b )

[0068] The viscosity of the damping liquid is expressed as,

[0069] The relationship between the number of open electromagnetic valves and the viscosity of the damping liquid is: S=((μ-μ0) / μ) / 10%, wherein μ0 is a preset value, and S is rounded up.

[0070] In specific use, the control logic can be adjusted by the person skilled in the art according to the selection of the first strain gauge, the second strain gauge, the first piezoelectric ceramic sensor and the second piezoelectric ceramic sensor. Some parameters can be compensated according to the environment, the material of the first strain gauge, the second strain gauge, the first piezoelectric ceramic sensor and the second piezoelectric ceramic sensor.

[0071] Embodiment 2

[0072] Compared with embodiment 1, the difference is that an emergency heat sink is further included, the emergency heat sink is fixed on the side wall of the cylinder body, the emergency heat sink is loaded with cooling liquid for cooling the cylinder body, the bottom of the emergency heat sink is provided with a heat dissipation electromagnetic valve, the cylinder body is provided with a temperature sensor; the heat dissipation electromagnetic valve and the temperature sensor are respectively connected with the controller; the controller is further used for receiving the cylinder body temperature information detected by the temperature sensor, and controlling the heat dissipation electromagnetic valve to open when the cylinder body temperature information exceeds a preset threshold.

[0073] In specific use, the temperature of the cylinder body is detected by the temperature sensor. In normal times, the temperature of the cylinder body can be dissipated to the air. If an abnormality occurs, the emergency cooling of the cylinder body is realized by opening the heat dissipation electromagnetic valve.

[0074] The above is only an embodiment of the present application, the application is not limited to this embodiment. The application is not limited to the field involved in this embodiment, and the common knowledge of specific structures and properties in the scheme is not described in detail. The person skilled in the art knows all the ordinary technical knowledge in the field of the application before the filing date or the priority date, can know all the prior art in the field, and has the ability to apply conventional experimental means before that date. The person skilled in the art can perfect and implement the scheme under the guidance of this application, and some typical known structures or known methods should not be an obstacle for the person skilled in the art to implement the present application. It should be noted that, for the person skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be considered as the protection scope of the present application. These do not affect the effect and practicality of the patent. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode in the specification can be used to explain the content of the claims.

Claims

1. A beam-arch assembly vibration damping structure, characterized by: The application relates to a damping liquid viscosity detection device for a damper, which comprises the following components: an upper support body, the lower surface of which is embedded with a first strain gauge; a cylinder body, which is filled with damping liquid, the bottom of the cylinder body is embedded with a first piezoelectric ceramic sensor which is in contact with the damping liquid; a piston, which is in sliding connection with the cylinder body, a plurality of through holes are formed in the piston and extend through both ends of the piston, the through holes are respectively provided with electromagnetic valves for controlling the opening and closing of the through holes, and the piston is embedded with a second piezoelectric ceramic sensor which is in contact with the damping liquid; a piston rod, one end of the piston rod extends into the cylinder body and is fixedly connected with the end of the piston, and the other end of the piston rod is fixed with the upper support body, and the two ends of the first strain gauge are respectively fixed with the piston rod and the upper support body; a lower support body, the upper surface of which is embedded with a second strain gauge, the bottom of the cylinder body is fixed with the lower support body, and the two ends of the second strain gauge are respectively fixed with the cylinder body and the lower support body; a controller, which is in signal connection with the first strain gauge, the second strain gauge, the first piezoelectric ceramic sensor, the second piezoelectric ceramic sensor and the electromagnetic valves respectively; wherein the controller is used for judging whether the load is normal or abnormal according to the pressure deformation peak value of the first strain gauge and the second strain gauge, if the load is normal, then according to the deformation frequency of the first strain gauge and the second strain gauge, the electromagnetic valves are periodically controlled to be opened when the strain changes from compression to tension, and the electromagnetic valves are controlled to be closed when the strain changes from tension to compression, if the load is abnormal, then all the electromagnetic valves are controlled to be opened, the controller is also used for comparing the difference between the parameters of the first strain gauge and the second strain gauge and the first piezoelectric ceramic sensor and the second piezoelectric ceramic sensor with a preset difference value, determining the viscosity of the damping liquid, and according to the corresponding relationship between the viscosity of the damping liquid and the preset number of the opened electromagnetic valves, determining the number of the electromagnetic valves which are periodically opened when the strain changes from compression to tension.

2. A beam-arch combination vibration damping structure according to claim 1, characterized by: The structures of the flow paths formed by the through holes are different.

3. A beam-arch combination vibration damping structure according to claim 2, characterized by: The device further comprises a wireless communication module, a power supply coil is arranged on the cylinder body, a permanent magnet is arranged on the side surface of the piston rod, a power conversion module which provides power supply for a storage battery is connected with the power supply coil, the power conversion module is in electrical connection with the controller, the controller is further used for comparing the power conversion parameter of the power conversion module with the deformation frequency of the first strain gauge and the second strain gauge, if the corresponding relationship between the two exceeds a preset range, an alarm instruction is generated, and the wireless communication module is used for receiving and sending the alarm instruction to a preset address.

4. A beam-arch combination vibration damping structure according to claim 3, characterized by: The device further comprises an emergency heat dissipation box, the emergency heat dissipation box is fixed on the side wall of the cylinder body, the emergency heat dissipation box is loaded with cooling liquid which is used for cooling the cylinder body, a heat dissipation electromagnetic valve is arranged on the bottom of the emergency heat dissipation box, and a temperature sensor is arranged on the cylinder body; the heat dissipation electromagnetic valve and the temperature sensor are in signal connection with the controller respectively; the controller is further used for receiving the cylinder temperature information detected by the temperature sensor and controlling the heat dissipation electromagnetic valve to be opened when the cylinder temperature information exceeds a preset threshold value.

5. A beam-arch combination vibration damping structure according to claim 4, characterized by: Mounting counterbores for accommodating the first strain gauge and the second strain gauge are respectively arranged on the upper support body and the lower support body.

6. A beam-arch combination vibration damping structure according to claim 5, characterized by: The preset difference between the parameters of the first and second strain gauges and the first and second piezoelectric ceramic sensors is determined according to a propagation equation of the pressure wave in the damping liquid; the propagation equation is expressed as: the greater the viscosity of the damping liquid, the greater the energy dissipation of the pressure wave in the damping liquid, and the smaller the amplitude of the received signal and the viscosity change index; the greater the frequency of the pressure wave, the faster the energy attenuation of the pressure wave in the damping liquid; The greater the propagation distance of the pressure wave in the damping liquid, the greater the energy dissipation in the propagation process, and the smaller the amplitude of the signal received by the piezoelectric ceramic sensor; the amplitude and frequency of the pressure wave can be determined by the deformation amount and amplitude of the first and second strain gauges.

7. The damping structure of the beam-arch combination according to claim 1, characterized in that: The peak value of the deformation under pressure measured by the first strain gauge is the highest voltage value within time t, denoted as U x The deformation frequency of the first strain gauge is the vibration frequency within time t, denoted as f x The peak value of the deformation under pressure measured by the second strain gauge is the highest voltage value within time t, denoted as U y The deformation frequency of the second strain gauge is the vibration frequency within time t, denoted as f y ; The peak value of the pressure deformation measured by the first piezoelectric ceramic sensor is the highest voltage value within time t, denoted as U a The deformation frequency of the first piezoelectric ceramic sensor is the vibration frequency within time t, denoted as f a The peak value of the pressure deformation measured by the second piezoelectric ceramic sensor is the highest voltage value within time t, denoted as U b The deformation frequency of the second piezoelectric ceramic sensor is the vibration frequency within time t, denoted as f b ; The preset difference is denoted as C1=(U x *f x +U y *f y ) / (U a *f a +U b *f b ) The viscosity of the damping liquid is expressed as, The correlation between the number of open electromagnetic valves and the viscosity of the damping liquid is S = ((μ - μ0) / μ) / 10%, wherein μ0 is a preset value, and S is rounded up.

8. A method of damping a beam-arch assembly according to the beam-arch assembly damping structure of claim 1, characterized by, It comprises the following contents: S1 vibration parameter acquisition step, the deformation parameters of the upper beam body and the abutment of the beam-arch combination and the contact position of the damping structure are collected by the first and second strain gauges, respectively, the deformation parameters include deformation amplitude and deformation frequency; S2 damping liquid viscosity parameter acquisition step, according to the difference between the parameters of the first and second strain gauges and the first and second piezoelectric ceramic sensors, and the preset difference, the viscosity of the damping liquid is determined; S3 damping coefficient compensation parameter determination step, according to the correspondence between the viscosity of the damping liquid and the preset number of electromagnetic valves opened, the number of electromagnetic valves periodically opened when the first and second strain gauges change from compression to tension is determined; S4 damping coefficient compensation parameter adjustment step, according to the compression deformation peak value of the first and second strain gauges, it is judged whether it is normal load or abnormal load, if it is normal load, then according to the deformation frequency of the first and second strain gauges, the corresponding number of electromagnetic valves is periodically controlled to open when the first and second strain gauges change from compression to tension, and the corresponding number of electromagnetic valves is controlled to close when the first and second strain gauges change from tension to compression; if it is abnormal load, then control all electromagnetic valves to open.

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