CN203202108U - Damping force controllable viscous damper and intelligent monitoring and control system thereof - Google Patents

Abstract

The utility model discloses a viscous damper with controllable damping force and its intelligent monitoring and control system. The damper includes a cylinder body, a piston and a piston rod, wherein the inside of the cylinder body is divided into a main cylinder and an auxiliary cylinder. The main cylinder is filled with a damping medium composed of polyethylene glycol and nano-scale silicon dioxide particles, and the silicon dioxide particles are suspended and dispersed in polyethylene glycol; the piston is arranged inside the main cylinder and can move along its axial direction It moves back and forth, thereby driving the piston rod connected to it to move together; one end of the piston rod runs through the damping hole opened on the piston, and the other end extends into the auxiliary cylinder. The utility model also discloses a corresponding intelligent monitoring and control system. Through the utility model, the effective control of the damping force of the damper can be realized, and the real-time detection and feedback adjustment of the operating state of the damper can be obtained, so as to achieve better protection for the safety of the engineering structure.

Description

A viscous damper with controllable damping force and its intelligent monitoring and control system

technical field

The utility model belongs to the technical field of structural damping, and more specifically relates to a viscous damper with controllable damping force and an intelligent monitoring and control system thereof.

Background technique

A damper is a device that provides movement resistance to consume movement energy. Since the 1970s, damping technology has been gradually used in structural engineering such as buildings, bridges, and railways, and has achieved rapid development. At present, dampers are mainly divided into spring dampers, hydraulic dampers, rotary dampers, viscous dampers, etc. Among them, the working principle of viscous dampers is based on fluid movement, especially when fluid passes through an orifice. The damper made of the effect of resistance. Because of its indeterminate stiffness, good weather resistance, and the ability to reduce both structural stress and reaction displacement, it is widely used in high-rise buildings, bridges, anti-seismic renovation of building structures, anti-vibration of industrial pipeline equipment, and military industries.

The basic formula of the viscous damper is F=CVa, where F represents the damping force, C is the damping coefficient, V represents the speed of the piston movement, and a is the speed index. It can be seen from the formula that the viscous damper belongs to the velocity type damper, and its velocity index directly affects the energy dissipation performance of the damper. For the damping energy-dissipating materials of the viscous damper, currently commonly used mainly include silica gel and silicone oil and the like. Although silica gel has good viscosity-temperature properties, moisture-proof and electrical insulation, and small compression deformation, it has defects such as poor temperature stability; silicone oil has good heat resistance, oxidation resistance, and low temperature resistance, and is not volatile and compression-resistant. Strong force means small tension and stable chemical properties, so it is currently the mainstream viscous energy-dissipating material in the industry.

However, the working speed of the viscous damper in the prior art is pre-designed, once the vibration of the structural engineering is greater than the design value of the viscous damper, it may cause damage to the damper and affect the safety of the engineering structure. In addition, when the viscous damper is installed on the structural engineering, the vibration force and displacement of the engineering structure cannot be effectively monitored, so that the vibration state of the engineering structure cannot be monitored and monitored in a timely and effective manner. Control accordingly. Correspondingly, there is a technical demand for further improvement in the structure of the above-mentioned type of damper and its associated use in the related art.

Utility model content

In view of the above defects or improvement needs of the prior art, the purpose of this utility model is to propose a viscous damper with controllable damping force and its intelligent monitoring and control system, in which through the composition of the damper and the key performance parameters Improvement can achieve effective control of the damping force of the damper; in addition, through the design of related monitoring and control systems, real-time, intelligent detection and adjustment control of the operating state of the damper can be realized, thereby achieving better protection for the safety of engineering structures.

According to one aspect of the present invention, a viscous damper with controllable damping force is provided. The damper includes a cylinder, a piston and a piston rod, and is characterized in that:

The interior of the cylinder is divided into the main cylinder and the auxiliary cylinder, in which the main cylinder is filled with a damping medium composed of polyethylene glycol and nano-scale silicon dioxide particles, and the silicon dioxide particles are suspended and dispersed in polyethylene glycol;

The piston is arranged inside the master cylinder and can move back and forth along its axial direction, thereby driving the piston rod connected to it to move together; one end of the piston rod runs through the damping hole opened on the piston, and the other end extends into the in the auxiliary cylinder.

According to another aspect of the present invention, a corresponding damper monitoring and control system is also provided, the system includes a detection unit, a data acquisition unit, an analog-to-digital conversion unit, a photoelectric converter, a communication optical fiber and a central control unit, and is characterized in that :

The detection unit includes a displacement sensor, a speed sensor and a tension pressure sensor arranged on the damper, which are respectively used to detect the relative displacement of the damper relative to its own connection point, the relative motion speed signal relative to its own connection point and the corresponding Perform real-time detection on the damping force of the speed signal and obtain the detection result;

The data acquisition unit is used to perform analog signal acquisition on the obtained detection results, and the collected analog signals are sequentially processed by the analog-to-digital conversion unit and the photoelectric converter, and then transmitted to the central processing unit via the communication optical fiber;

The central processing unit converts the received optical signal into a digital signal and displays it, thereby monitoring the operating state of the damper in real time; in addition, the central processing unit can adjust the relative movement speed signal of the damper as required, The speed adjustment signal is converted into an optical signal and returned through the communication optical fiber, and then fed back to the damper after being processed by the photoelectric converter and the analog-to-digital conversion unit in turn, thereby realizing the corresponding control of the damper.

As a further preference, the displacement sensor is an electromagnetic displacement sensor, the speed sensor is a magnetoelectric speed sensor, and the tension-pressure sensor is a piezoelectric tension-pressure sensor.

As a further preference, when the central processing unit monitors that the relative movement speed signal of the damper exceeds the control value of its design index, then lock its relative movement speed as the control value.

Generally speaking, compared with the prior art, the viscous damper with controllable damping force and its monitoring and control system according to the utility model mainly has the following technical advantages:

1. By improving the structure, composition and related parameters of the viscous damper, the controllability of the damping force can be realized, and the damping force can be kept relatively constant at a specific speed, so the shock absorption and protection effect is better , wider application;

2. By designing an intelligent monitoring and control system based on optical fiber long-distance transmission for the damper, it can display the real-time and accurate detection of the damper's operating status; in addition, it can also quickly adjust the speed signal of the damper according to the response situation. In this way, the safety of the damper can be effectively controlled, and the damage of the damper and its engineering structure in harsh environments can be avoided.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a viscous damper with controllable damping force according to the present invention;

Fig. 2 is a schematic diagram of the overall structure of the damper monitoring and control system according to the present invention.

Throughout the drawings, the same reference numerals are used to designate the same elements or structures, wherein:

1-master cylinder 2-auxiliary cylinder 3-piston rod 4-piston 5-damping medium 6-damping hole 12-data acquisition unit 13-analog-to-digital conversion unit 14-photoelectric converter 15-communication optical fiber 16-central control unit 111- Displacement sensor 112-speed sensor 113-pull pressure sensor

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

In view of the fixed working speed of various viscous dampers in the prior art, once the vibration of the structural engineering is greater than the design value of the viscous damper, it may cause damage to the damper and have a great impact on the safety of the engineering structure , the utility model expects to make corresponding improvements to this type of viscous damper, so as to realize effective control of the damping force of the damper.

Fig. 1 is a schematic diagram of the overall structure of a viscous damper with controllable damping force according to the present invention. As shown in sharp figure 1, the damping force controllable viscous damper according to the utility model mainly includes a cylinder body, a piston and a piston rod, etc., wherein the interior of the cylinder body is divided into, for example, a main cylinder 1 and an auxiliary cylinder distributed left and right. 2. The main cylinder 1 is filled with a damping medium 5 composed of polyethylene glycol and nano-sized silicon dioxide particles, and the silicon dioxide particles are suspended and dispersed in the polyethylene glycol. The piston 4 is arranged inside the master cylinder 1 and can move back and forth along its axial direction, thereby driving the piston rod 3 connected to it to move together. One end of the piston rod 3 runs through the damping hole 6 provided on the piston 4 , and the other end extends into the auxiliary cylinder 2 . In addition, sealing elements can also be provided in each gap or hole to improve the sealing performance of the overall device.

When the viscous damper with controllable damping force of the utility model works, the piston will move back and forth in the main cylinder and the auxiliary cylinder, and the damping medium will generate viscous resistance when passing through the damping hole, thereby achieving shock resistance and drag reduction Effect. In particular, due to the choice of polyethylene glycol and nano-silica particles suspended in it as the damping medium, after the combination of polyethylene glycol with strong fluidity and hard silica particles, the silica particles will be fused to the polymer. Ethylene glycol and form a good match, forming a damping energy-dissipating medium with a strong correlation with the speed: when the moving speed of this medium is slow, the hard particles can move around and make the damping material appear as a whole It is a liquid; when the speed of movement increases, the hard particles collide with each other and hinder each other's movement, so that the damping medium becomes tougher as a whole, and gradually changes from liquid phase to solid phase. Correspondingly, the damper can prevent the material particles from interfering with each other at low speed, and play the role of damping and dissipating energy in the normal mode; once the damper is impacted or moves rapidly, the material particles collide with each other and transform into a solid phase , resulting in a greater damping force and energy dissipation in a new mode. In other words, the damper constructed according to the utility model can prevent the medium particles from interfering with each other at low speed, and mainly play the role of damping and consuming energy in a fluid state; and once the damper is impacted or moves rapidly, the medium particles Collision occurs between them and transforms into a solid phase or close to a solid phase, thereby generating a large damping force to consume energy. Accordingly, the controllability of the damping force can be effectively realized, and the damping force can be kept relatively constant at a specific speed.

Another main improvement of the utility model lies in the remote monitoring and control system of the damper. As shown in FIG. 1 , the damper monitoring and control system according to the present invention includes a detection unit, a data acquisition unit 12 , an analog-to-digital conversion unit 13 , a photoelectric converter 14 , a communication optical fiber 15 and a central control unit 16 . Specifically, the monitoring unit includes a displacement sensor 111, a speed sensor 112, and a tension and pressure sensor 113 arranged on the damper, wherein the displacement sensor 111 is, for example, an electromagnetic sensor, and is used to monitor the damper relative to its own connection point (fixed installation point) ) to detect the relative displacement; the speed sensor 112 is used to detect the relative speed of the damper relative to its own connection point, and the tension pressure sensor 113 is, for example, a piezoelectric sensor, which is used to detect the damping of the damper corresponding to the speed signal force.

After the detection unit completes the detection of the above parameters of the damper, the data acquisition unit 12 (for example, sbRIO-9601 type) performs high-speed analog signal acquisition on these detection signals, and converts them to The analog signal is converted into a digital signal, and then the digital signal is converted into an optical signal by the photoelectric converter 14 . The optical signal is transmitted to the central control unit 16 via the communication optical fiber 15, and is converted into a digital signal by the photoelectric converter again, and displayed on the monitoring computer, thereby realizing the real-time monitoring of the operating state of the damper.

When encountering severe conditions such as earthquakes or hurricanes, the speed control value of the damper can also be adjusted through the central processing unit 16, so as to avoid excessive operating speed of the damper and damage to the connection parts. In specific application, it is also possible to compare the collected and detected data of the relative speed of the damper with the speed control value at a certain time interval. Once the speed monitoring data exceeds the control value, the central processing unit 16 issues an instruction to convert the speed to the speed through the photoelectric converter. The instruction is converted into an optical signal and transmitted to the site via optical fiber; the optical signal is again converted into a digital signal by a photoelectric converter, and converted into an analog signal by an analog-to-digital conversion unit, and then makes the damper perform movement at the speed control value, and the corresponding realization control over the safety of the damper.

According to the damper monitoring and control system of the utility model, the displacement, damping force and speed of various viscous dampers including the above-mentioned damping force controllable dampers can be monitored in real time, and the entire structural state can be continuously and real-time monitored. Real-time, online health status monitoring and evaluation, and real-time and accurate evaluation of the safety of structures. At the same time, when earthquakes and hurricanes come, the operating speed of the damper can be controlled so as to control the maximum damping force and ensure the safety of the damper components. Correspondingly, the content of traditional manual monitoring and control is greatly extended to realize predictive maintenance, improve the management level of maintenance and maintenance, ensure the reliability, safety and durability of bridges and large building structures, and avoid potential catastrophic events.

In order to realize the aforementioned monitoring and control of the damper, corresponding monitoring and control software can also be developed and installed on the computer of the central control unit. For example, functions such as signal acquisition, storage, playback and analysis can be completed through software, and the speed control value can be set independently in terms of control. The signal can be continuously collected and stored without interruption, and the stored data can be played back and analyzed. Use the table form to set the data acquisition channels, the channels can be grouped, and the channel settings can be changed in batches. Use the database to manage sensor parameters, one-time calibration and parameter entry, multiple use, no need to repeatedly input sensor parameters. Automatically assign data acquisition physical channels to measurement channels. Automatically associate measurement channels with sensors. Hierarchical error checking, guide users step by step to use the correct settings, signal analysis and display interface can be fully customized. In addition, according to different applications and personal preferences, users can freely define the combination and appearance of the interface, signal processing and analysis type, display format, algorithm parameters, etc.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and modifications made within the spirit and principles of the utility model Improvements and the like should all be included within the protection scope of the present utility model.

Claims (4)

1. A viscous damper with controllable damping force, which damper comprises cylinder body, piston and piston rod, is characterized in that: The interior of the cylinder is divided into the main cylinder (1) and the auxiliary cylinder (2), in which the main cylinder (1) is filled with a damping medium (5) composed of polyethylene glycol and nano-sized silica particles, and the two Silicon oxide particles are suspended and dispersed in polyethylene glycol; The piston (4) is arranged inside the master cylinder and can move back and forth along its axial direction, thereby driving the piston rod (3) connected to it to move together; one end of the piston rod (3) runs through the piston ( 4) The other end of the damping hole (6) extends into the auxiliary cylinder (2). 2. A system for performing intelligent monitoring and control on the damper as claimed in claim 1, the system comprising a detection unit, a data acquisition unit (12), an analog-to-digital conversion unit (13), a photoelectric converter (14 ), a communication optical fiber (15) and a central control unit (16), characterized in that: The detection unit includes a displacement sensor (111), a speed sensor (112) and a tension pressure sensor (113) arranged on the damper, which are respectively used to measure the relative displacement of the damper relative to its own connection point, relative to its own The relative motion speed signal of the connection point and the damping force corresponding to the speed signal are detected in real time and the detection results are obtained; The data acquisition unit (12) is used to perform analog signal acquisition on the obtained detection results, and the collected analog signals are sequentially processed by the analog-to-digital conversion unit (13) and the photoelectric converter (14), and then passed through the communication optical fiber (15 ) to the central processing unit (16); The central processing unit (16) converts the received optical signal into a digital signal and displays it, thereby monitoring the operating state of the damper in real time; in addition, the central processing unit (16) can adjust the damper as required The relative speed signal of the relative motion, the speed adjustment signal is converted into an optical signal and returned via the communication optical fiber, and then fed back to the damper after being processed by the photoelectric converter (14) and the analog-to-digital conversion unit (13), thereby realizing the adjustment of the damper. corresponding control. 3. The system according to claim 2, characterized in that, the displacement sensor (111) is an electromagnetic displacement sensor, the speed sensor (112) is a magnetoelectric speed sensor, and the tension and pressure sensor (113) It is a piezoelectric tension pressure sensor. 4. The system according to claim 2 or 3, characterized in that, when the central processing unit (16) monitors that the relative movement speed signal of the damper exceeds the control value of its design index, it locks its relative movement speed as control value.

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