Dynamic characteristic adjustable high-pile wharf structure model test system

Abstract

The application provides a high-pile wharf structure model test system with adjustable power characteristics, comprising: an exciting system for generating exciting force; a transmitter comprising a measuring part and a feedback part; the measuring part is used for detecting a measured variable x and converting it into an input signal Zi that can be accepted by an amplifier; the feedback part converts an output signal y of the transmitter into a feedback signal Zf and sends it back to the input end; an algebraic sum of the input signal Zi and a zero setting signal Zo is compared with the feedback signal Zf, a difference value epsilon is sent into the amplifier for amplification and conversion into a standard output signal y; and the application of the technical scheme can realize the dynamic response of the high-pile wharf structure under different loads.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-pile wharf model test, in particular to a high-pile wharf structure model test system with adjustable dynamic characteristics. BACKGROUND

[0002] The high-pile wharf is one of the main wharf structures built on soft soil foundation. According to the different inclination angles of the ground and the pile, it can be divided into forked piles and straight piles. The concrete forked pile, as a force component, mainly bears the force from the horizontal lateral load and the upper structure. Since it has a clear force transmission path, when external load exists, it gradually transmits to the foundation through the pile body, thereby minimizing the problem of lateral deformation of the wharf structure. The significant structural feature of the high-pile wharf is light structure, clear stress, suitable for being made into a transparent type, good for weakening the effect of waves, and suitable for soft soil foundation. The disadvantages are thin structure, poor durability, easy damage of components and difficult to repair, poor adaptability to ground overload and handling process changes.

[0003] With the continuous development of water conservancy facilities construction and port wharf in China, the durability and safety of the current structure of the high-pile wharf have become a major problem to be solved. The high-pile wharf structure with adjustable dynamic characteristics can change its height with the change of the load action of the high-pile wharf, thereby improving the durability and safety. In the service process, the wharf structure not only bears the load from the environment such as live load and dead load, but also bears the dynamic load such as mooring force and ship squeezing force. When the wharf structure is subjected to a large impact in a short time, the force component may be damaged, and even the wharf structure may collapse, thereby causing a series of serious consequences. As a large-scale wharf installation work, the high-pile wharf consumes a lot of manpower and material resources during installation. In order to save unnecessary resource consumption, a structure model can be designed to find the most suitable height according to the dynamic characteristics of the original high-pile wharf. However, the designed high-pile wharf structure model is proportionally reduced on the basis of the original size, but this is only a physical structure model in an ideal situation. Therefore, it is important to design a dynamic response system that can adaptively adjust the high-pile wharf while proportionally reducing the high-pile wharf. SUMMARY

[0004] Therefore, the present application aims to provide a high-pile wharf structure model test system with adjustable dynamic characteristics, which can realize the dynamic response of the high-pile wharf structure under different load actions.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a high-pile wharf structure model test system with adjustable dynamic characteristics, comprising:

[0006] vibration system for generating excitation force;

[0007] transmitter, which comprises a measuring part and a feedback part; the measuring part is used to detect the measured variable x and convert it into input signal Zi, which can be accepted by the amplifier; the feedback part converts the output signal y of the transmitter into feedback signal Zf, which is sent back to the input end; the algebraic sum of input signal Zi and zero setting signal Zo is compared with feedback signal Zf, and the difference ε is sent to the amplifier for amplification and conversion into standard output signal y;

[0008] worm screw lift;

[0009] three-phase asynchronous motor;

[0010] four-column support structure, the inside of which is composed of parts such as worm screw lift and three-phase asynchronous motor; when the building structure is subjected to external force, the force is transmitted to the structural support through the four-column support structure, and then to the foundation; the foundation also transmits the counterforce to the four-column support structure through the support, forming a stable state;

[0011] concrete pedestal, which bears the anchoring of the connected parts and all additional loads;

[0012] control system, which is composed of control subject, control object and control medium, connects the pressure sensor and the four-column support structure, accepts the electrical signal of the load borne by the wharf, adjusts the height of the high-pile wharf according to the signal, and makes the controlled object tend to a certain required stable state.

[0013] In a preferred embodiment, the worm screw lift comprises a bottom plate and a worm gear reducer, the right end of the bottom plate is provided with the worm gear reducer, the bottom plate and the worm gear reducer are connected through threaded rotation, the center of the worm gear reducer is provided with an oil inlet, the left end of the bottom plate is provided with a fixing piece, the upper center of the fixing piece is provided with a connecting piece, the middle part of the connecting piece is internally provided with a lifting rod; after the installation of the worm screw lift, it should be first idled under no load, and then gradually loaded.

[0014] In a preferred embodiment, the four-column support structure is composed of a base and a column to form an integral support part, and further comprises a stretching clamp, which is composed of an upper jaw seat and a lower jaw seat, and is used to fix the foundation pile of the high-pile wharf structure model during the experiment, and adjust its height by using the worm screw lift and the three-phase asynchronous motor; the lower jaw seat and the upper jaw seat are respectively arranged on the lower cross beam and the upper cross beam.

[0015] In a preferred embodiment, the four-column support structure is made of stainless steel material.

[0016] In a preferred embodiment, the vibration excitation system comprises an electromagnetic vibrator; the electromagnetic vibrator is placed on the column or the bearing platform, and energy is transmitted to the high-pile wharf to make the high-pile wharf obtain acceleration; then the electromagnetic vibrator is amplified and transmitted by the transmitter, and then transmitted to the computer of the total control system; then the frequency generated by the acceleration of the electromagnetic vibrator to the power characteristic adjustable high-pile wharf structure model test system is compared with the real frequency of the high-pile wharf in the original size and shape, and the height of the power characteristic adjustable high-pile wharf structure model test system is adjusted by the system composed of the worm screw elevator, the worm reducer and the three-phase asynchronous motor, and repeated testing is performed until a most stable state is reached.

[0017] Compared with the prior art, the power characteristic adjustable high-pile wharf structure model test system has the following beneficial effects:

[0018] 1. The power characteristic adjustable high-pile wharf structure model test system can simulate the load action of the high-pile wharf by using the vibrator, and the most stable height of the wharf pile is determined through experiments, so that the service life of the high-pile wharf is greatly improved, the safety of the high-pile wharf is increased, and the construction cost of the wharf is reduced.

[0019] 2. The high-pile wharf structure model can adaptively adjust the height of the pile, and the experimental efficiency is improved, so that the experimental time is greatly reduced.

[0020] 3. The worm screw elevator is stable and reliable in operation, has low noise, can be self-locked under certain conditions, and has the characteristics of small power and large thrust.

[0021] 4. The control system of the power characteristic adjustable high-pile wharf structure model test system adopts independent system power supply, field power supply and query power supply for power supply, so that the interference of the complex field environment on the DCS control system can be effectively isolated, the electromagnetic compatibility (EMC) index is greatly improved, and the reliability of the DCS control system is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the power characteristic adjustable high-pile wharf structure model test system in the experiment of the present application;

[0023] Figure 2 is a four-column support structure schematic diagram in the experiment of the present application;

[0024] Figure 3 is an example diagram of the three-phase asynchronous motor in the embodiment of the present application;

[0025] Figure 4 is a main body structure schematic diagram of the worm screw elevator in the embodiment of the present application;

[0026] Figure 5 Figure 1 is a schematic diagram of the working principle of the high-pile wharf structure model test system with adjustable dynamic characteristics in the experiments of the present application.

[0027] Reference signs:

[0028] 1 - column or pile cap, 2 - electromagnetic exciter, 3 - foundation pile, 4 - four-column support structure, 5 - upper jaw seat, 6 - lower jaw seat, 7 - lower crossbeam, 8 - test platform, 9 - upper crossbeam, 10 - worm screw lifter, 11 - stand column, 12 - lower crossbeam transmission assembly, 13 - base, 14 - upper shell, 15 - worm gear shell, 16 - connecting block, 17 - three-phase asynchronous motor, 18 - screw rod, 19 - fixing piece, 20 - connecting piece, 21 - oil filling port, 22 - worm gear reducer, 23 - bottom plate. DETAILED DESCRIPTION

[0029] The present application will be further described below in conjunction with the drawings and examples.

[0030] It should be noted that the following detailed description is illustrative only and is intended to provide further description of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0031] It should be noted that the terms used herein are merely for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application; as used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation, device, component, and / or combinations thereof.

[0032] Reference Figures 1-4 The machines and systems used in the present application include:

[0033] An excitation system, which is a device attached to some machines and equipment to generate excitation force, is an important component of mechanical vibration. The exciter can make the excited object obtain a certain form and size of vibration, so as to perform vibration and intensity test on the object, or to calibrate vibration test instruments and sensors. The exciter can also be used as an excitation component to form a vibrating machine, which is used to realize the conveying, screening, compaction, molding and soil and sand compaction of materials and objects. According to the different excitation types, the exciter is divided into inertial, electric, electromagnetic, electro-hydraulic, pneumatic and hydraulic types. The exciter can generate unidirectional or multidirectional, simple harmonic or non-simple harmonic excitation force.

[0034] The transmitter, the measuring part is used for detecting the measured variable x, and converting it into an input signal Zi (voltage, current, displacement, force or torque signal) that can be accepted by the amplifier. The feedback part converts the output signal y of the transmitter into a feedback signal Zf, and sends it back to the input. The algebraic sum of Zi and the zero signal Zo is compared with the feedback signal Zf, and the difference ε is sent into the amplifier for amplification and conversion into a standard output signal y.

[0035] The worm screw elevator 10, also known as QWL elevator, is widely used in machinery, metallurgy, construction, water conservancy equipment and other industries, and has many functions such as lifting, descending, pushing with auxiliary parts, turning over and adjusting the height of various positions. The QWL worm screw elevator is a basic lifting component, which has many advantages such as compact structure, small size, light weight, wide power source, no noise, easy installation, flexible use, multiple functions, multiple matching forms, high reliability and long service life. It can be used alone or in combination, can accurately control and adjust the lifting or pushing height according to a certain program, can be directly driven by an electric motor or other power, or can be manually operated. It has different structural forms and assembly forms, and the lifting height can be customized according to user's requirements. The device can be self-locking.

[0036] The triple-phase asynchronous motor 17 (Triple-phase asynchronous motor) is a kind of induction motor, which is powered by simultaneously connecting 380V three-phase alternating current (phase difference 120 degrees). Since the rotor and the stator rotating magnetic field of the triple-phase asynchronous motor rotate in the same direction at different speeds, there is a slip, so it is called triple-phase asynchronous motor. The speed of the rotor of the triple-phase asynchronous motor is lower than that of the rotating magnetic field. The rotor winding produces electromotive force and current due to the relative motion with the magnetic field, and interacts with the magnetic field to produce electromagnetic torque, realizing energy conversion.

[0037] The four-column support structure 4 is one of the main elements of the building structure system, which is mainly composed of worm screw elevators and triple-phase asynchronous motors. When the building structure is subjected to external force (or load), the force is transmitted to the structure support through the structural member, and then to the foundation. The foundation also transmits the reaction force to the member through the support to form a stable state.

[0038] The purpose of the concrete foundation is to ensure the stable and normal operation of the machine. The concrete base material should be solid and have a large volume, which can bear the anchoring of the connected parts and all additional loads, and play the role of bearing the weight and load of the high-pile wharf. The anchor bolts used in the concrete structure can be made of carbon steel, stainless steel or alloy steel. According to the differences in environmental conditions and the different requirements for durability, the corresponding varieties should be selected.

[0039] The control system is a management system with self-target and function, which is composed of control subject, control object and control medium, connects pressure sensor and four-column support structure, receives electric signal of load of wharf, adjusts height of high-pile wharf according to signal, and makes controlled object tend to certain required stable state.

[0040] The worm screw elevator is installed by adjusting the bottom plane, so that the force of the screw rod is consistent with the axial direction, and the center line elevation needs to be calibrated to avoid the rupture of the box and the screw rod due to uneven installation stress. When the shaft coupling is connected, the coaxiality needs to be calibrated. When the flexible shaft coupling is connected, the floating amount should not be greater than the allowable range of the shaft coupling. Secondly, during the installation process of the worm screw elevator, the absolute perpendicularity of the screw rod and the installation surface should be ensured, and external lateral force should not be applied to the screw rod. The worm gear box of the elevator must be firmly installed on the equipment to avoid loosening and vibration. The worm screw elevator cannot be forcibly stopped during operation, otherwise the elevator will be damaged. When the worm screw elevator works in a dusty place, a dust cover extension sleeve accessory is used to protect the screw rod. When used outdoors, a cover shell and other devices need to be used to ensure that the worm screw elevator is not directly affected by wind and rain. When the worm screw elevator is running, the temperature of the box body should not be too high, generally kept at 0-50 DEG C. Different types of lubricants should be selected at different temperature stages. Low-temperature lubricant is used below zero degrees, and high-temperature special lubricating grease is used in high-temperature conditions.

[0041] The four-column support structure 4 should be made of stainless steel, which has a smooth and clean surface, a modern and elegant appearance, good rust resistance, and contains enough chromium and nickel elements, so it has good rust resistance; easy to maintain, no special maintenance and maintenance is needed, just wipe it with a wet cloth to keep it clean; environmentally friendly, stainless steel is a recyclable material that can be reused and will not pollute the environment. In addition, stainless steel is not easily eroded by chemicals, so it can be safely used in various decorative occasions.

[0042] Figure 1 The dynamic characteristic adjustable high-pile wharf structure model test system is used in the experiment of the application. In the experiment, the dynamic characteristic adjustable high-pile wharf structure model test system comprises an electromagnetic exciter 2, a transmitter, and a four-column support structure 4.

[0043] Figure 2 The four-column support structure 4 is a four-column support structure 4 based on the transformation of a four-column hydraulic machine in the embodiment of the application, wherein the support part is integrated by the base 13 and the 11 stand column, the stretching clamp is composed of the upper jaw seat 5 and the lower jaw seat 6, the base pile of the high-pile wharf structure model can be fixed in the experiment, the height thereof can be adjusted by using the worm screw elevator and the three-phase asynchronous motor, and the lower jaw seat 6 and the upper jaw seat 5 are arranged on the lower cross beam 7 and the upper cross beam 9 respectively.

[0044] Figure 4 It is one of the worm screw elevators in the embodiment of the application, wherein the components include the base plate 23 and the worm reducer 22, the worm reducer 22 is arranged on the right end of the base plate 23, the base plate 23 and the worm reducer 22 are connected through thread rotation, so that the connection is more compact during the connection, the oil inlet 21 is arranged at the center of the worm reducer 22, the fixing piece 19 is arranged on the left end of the base plate 23, the connecting piece 20 is arranged at the upper center of the fixing piece 19, and the lifting rod 18 is arranged in the middle of the connecting piece 20. In this experiment, the worm screw elevator after installation should be first idled under no load, then gradually loaded, and under normal circumstances, it runs stably without impact, noise, oil leakage and other phenomena. During use, the lubricant should be checked and replaced in time to ensure that the worm and the screw are sufficiently lubricated to reduce wear and prolong the service life.

[0045] In this experiment, the electromagnetic exciter is selected as the vibration exciter. The electromagnetic exciter is a device that inputs a periodically changing current into an electromagnet coil, and generates a periodically changing excitation force between the excited part and the electromagnet. The electromagnetic exciter used in vibration machinery is usually composed of an electromagnet core with a coil and an armature, and a spring is arranged between the core and the armature. When alternating current, alternating current plus direct current, or pulsating current after half-wave rectification is input into the coil, a periodically changing excitation force is generated. This exciter usually fixes the armature directly to the working part that needs to be vibrated. The thrust can be selected from 20N to 1000N. The whole adopts advanced structure design and precision machining technology, has the characteristics of reliable structure, small error, high precision, etc. The moving part is made of high-quality alloy material and improves the winding process and support system design, has the characteristics of light weight, wide frequency range (2Hz-10,000Hz), and can ensure the distortionless transmission of output force. Good airway design and the use of high-quality heat-conducting materials make the table body have good heat dissipation performance and low noise, supporting natural cooling and forced cooling.

[0046] In this experimental case, the electromagnetic exciter 2 is placed on the column or bearing platform 1, and a certain amount of energy is transmitted to the high-pile wharf, so that the high-pile wharf obtains a certain acceleration. Then, the electromagnetic exciter 2 applies a force to the high-pile wharf, which is amplified and transmitted by the transmitter, and then transmitted to the computer of the total control system. Then, according to the frequency and the original size of the high-pile wharf, the real frequency is compared, and the system composed of the worm screw elevator 10, the worm reducer 22 and the three-phase asynchronous motor is controlled to adjust the height of the power characteristic adjustable high-pile wharf structure model test system. Through repeated testing, it reaches a most stable state.

[0047] The above embodiments are only illustrative of the principles of the present application and its effects, and are not intended to limit the present application. Any modification or change made by any person skilled in the art without departing from the spirit and scope of the present application shall be included in the protection scope of the present application.

Claims

1. A model test system for a high-pile wharf structure with adjustable dynamic characteristics, characterized by It comprises: a vibration system for generating an excitation force; a transmitter, which comprises a measuring part for detecting a measured variable x and converting it into an input signal Zi that can be accepted by an amplifier, and a feedback part for converting an output signal y of the transmitter into a feedback signal Zf and sending it back to the input; an algebraic sum of the input signal Zi and a zeroing signal Zo is compared with the feedback signal Zf, and the difference ε is sent to the amplifier for amplification and conversion into a standard output signal y; a worm screw elevator; a three-phase asynchronous motor; a four-column support structure, the inside of which is composed of the worm screw elevator and the three-phase asynchronous motor part; when the building structure is subjected to external force, the force is transmitted to the structural support through the four-column support structure and then to the foundation; the foundation also transmits the counterforce to the four-column support structure through the support, forming a stable state; a concrete base, which bears the anchoring of the connected parts and all additional loads; a control system, which is composed of a control subject, a control object and a control medium, connects the pressure sensor and the four-column support structure, accepts the electrical signal of the load borne by the wharf, adjusts the height of the high-pile wharf according to the signal, and makes the controlled object tend to a certain required stable state.

2. The power performance adjustable high-pile wharf structure model test system according to claim 1, characterized in that, The worm screw elevator comprises a bottom plate and a worm gear reducer, the right end of the bottom plate is provided with the worm gear reducer, the bottom plate and the worm gear reducer are connected through thread rotation, the center of the worm gear reducer is provided with an oil inlet, the left end of the bottom plate is provided with a fixing piece, the upper center of the fixing piece is provided with a connecting piece, and the middle part of the connecting piece is internally provided with a lifting rod; after installation, the worm screw elevator should be first idled under no load and then gradually loaded.

3. The power characteristics adjustable high-pile wharf structure model test system according to claim 1, characterized in that, The four-column support structure is composed of a base and a column to form an integral support part, further comprises a stretching clamp, the stretching clamp is composed of an upper jaw seat and a lower jaw seat, the base piles of the high-pile wharf structure model are fixed in the experimental process, the height thereof is adjusted by the worm screw elevator and the three-phase asynchronous motor, and the lower jaw seat and the upper jaw seat are respectively arranged on the lower cross beam and the upper cross beam.

4. The power characteristics adjustable high-pile wharf structure model test system according to claim 3, characterized in that, The four-column support structure is made of stainless steel material.

5. The power characteristics adjustable high-pile wharf structure model test system according to claim 1, wherein The excitation system comprises an electromagnetic exciter; the electromagnetic exciter is placed on the column or the bearing platform, transmits energy to the high-pile wharf, makes the high-pile wharf obtain acceleration, and then transmits the force applied to the high-pile wharf by the electromagnetic exciter to the computer of the total control system through the transmitter for amplification and transmission; then, the frequency generated by the acceleration of the electromagnetic exciter to the power characteristic adjustable high-pile wharf structure model test system is compared with the real frequency of the high-pile wharf under the original size and shape; the height of the system composed of the worm screw elevator, the worm gear reducer and the three-phase asynchronous motor is adjusted to control the power characteristic adjustable high-pile wharf structure model test system; repeated testing is performed to make it reach a most stable state.

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