Lifting structure modal test method and system

Abstract

The invention provides a lifting structure modal test method and system. The invention discloses a lifting structure modal test method. The method comprises the following steps: mounting a detection mechanism and a locking mechanism on each lifting tower of a lifting structure; the lifting tower of the lifting structure is lifted; the lifting tower is locked and excited through the locking mechanism; and the modal information of the lifting structure is detected through the detection mechanism. The locking mechanisms are designed between the lifting tower sections for restraining and supporting, when the lifting structure is lifted in place, self-excited vibration generated when the locking mechanisms of the tower sections are locked serves as excitation, the detection mechanism is used for collecting signals, and modal testing of the heavy-load high lifting structure can be completed.

Description

Technical Field

[0001] This invention relates to the field of equipment modal testing technology, and in particular to a method and system for modal testing of lifting structures. Background Technology

[0002] As modern technology demands increasingly higher standards, the installation height of equipment is gradually increasing to improve accuracy and reliability. This situation presents challenges for modal testing: due to the high installation height and heavy load at the top, the overall frequency value of the structure tends to be low, potentially exceeding the measurement range of ordinary sensors and rendering them unusable; furthermore, for heavy-duty, high-lift structures, the response is smaller, making conventional hammer impact testing methods unusable. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method and system for modal testing of lifting structures, which addresses the shortcomings of the prior art.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a modal testing method for a lifting structure, comprising: installing a detection mechanism and a locking mechanism on each lifting tower of the lifting structure; lifting the lifting tower of the lifting structure; locking and energizing the lifting tower through the locking mechanism; and detecting the modal information of the lifting structure through the detection mechanism.

[0005] The beneficial effects of adopting the technical solution of the present invention are as follows: each lifting tower section is designed with a locking mechanism for constraint support. When the lifting structure is lifted into place, the self-excited vibration generated when the locking mechanism of each tower section is locked serves as excitation, and the signal is collected by the detection mechanism, which can complete the modal test of the heavy-duty high lifting structure.

[0006] Furthermore, the steps of locking and energizing the lifting tower through the locking mechanism include: locking the lifting tower with a pin and energizing the lifting tower with the self-excited vibration generated when the pin is locked.

[0007] The beneficial effects of adopting the above-mentioned further technical solution are as follows: A pin-locking structure is designed between each lifting tower section for constraint support. When the lifting structure is lifted into position, the self-excited vibration generated when the pins of each tower section are locked serves as excitation, and the signal is acquired using a zero-frequency sensor, enabling modal testing of the heavy-duty high-lift structure. The pin locking between the tower sections is the source of excitation.

[0008] Furthermore, the step of installing the detection mechanism and the locking mechanism on each lifting tower of the lifting structure includes: installing a zero-frequency sensor at the top of each lifting tower of the lifting structure; installing a locking mechanism in the middle and lower part of each lifting tower of the lifting structure; installing a load at the top of the lifting structure; and connecting the zero-frequency sensor to the testing instrument.

[0009] The beneficial effects of adopting the above-mentioned further technical solution are as follows: A pin-locking structure is designed between each lifting tower section for constraint support. When the lifting structure is lifted into position, the self-excited vibration generated when the pins of each tower section are locked serves as excitation, and a zero-frequency sensor is used to collect the signal, enabling modal testing of the heavy-duty high-lift structure. The heavy-duty high-lift structure is the test object, consisting of each lifting tower section and a top load. The zero-frequency sensor can collect signals starting from zero frequency. It is installed at the top of each tower section of the lifting structure and connected to the testing instrument via a data cable for signal acquisition.

[0010] Furthermore, in the step of installing zero-frequency sensors at the top of each lifting tower of the lifting structure, the zero-frequency sensors are affixed to the top of each lifting tower of the lifting structure; the step of connecting the zero-frequency sensors to the testing instruments includes: connecting the zero-frequency sensors to the testing instruments; connecting the testing instruments to a computer; and setting the parameters of the testing instruments.

[0011] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The testing equipment includes testing instruments and a computer, which records the signal data collected by the zero-frequency sensor for frequency analysis. Zero-frequency sensors are attached and fixed to the top of each tower section, and the sensors are connected to the testing instruments via data cables. The parameters of the testing instruments are set to ensure that the testing is in place.

[0012] Furthermore, prior to the step of installing the detection mechanism and locking mechanism on each lifting tower of the lifting structure, the following steps are included: leveling and tilting the lifting structure to facilitate the installation of the detection mechanism.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is that the heavy-duty high-lift structure can be leveled and erected, and is ready to attach sensors.

[0014] Furthermore, the step of detecting the modal information of the lifting structure through the detection mechanism includes: recording the excitation vibration signal data triggered when the lifting structure is lifted into position and locked by the locking mechanism; and analyzing the excitation vibration signal data to obtain frequency data for different lifting tower heights.

[0015] The beneficial effects of adopting the above-mentioned further technical solution are: recording and storing the excitation vibration signal data triggered when the lifting pin locks in place, and analyzing the data, frequency data for different tower section heights can be obtained. Modal testing of heavy-duty high-lift structures at different lifting heights can be performed, providing structural data support, and finite element simulation models can be corrected based on the test results.

[0016] Furthermore, the present invention also provides a lifting structure modal testing system for implementing the lifting structure modal testing method described in any of the above claims. The lifting structure modal testing system includes: a lifting structure, multiple detection mechanisms, and multiple locking mechanisms. The lifting structure is provided with multiple lifting towers, and the multiple detection mechanisms are respectively installed on the multiple lifting towers, and the multiple locking mechanisms are respectively installed on the multiple lifting towers.

[0017] The beneficial effects of adopting the technical solution of the present invention are as follows: each lifting tower section is designed with a locking mechanism for constraint support. When the lifting structure is lifted into place, the self-excited vibration generated when the locking mechanism of each tower section is locked serves as excitation, and the signal is collected by the detection mechanism, which can complete the modal test of the heavy-duty high lifting structure.

[0018] Furthermore, the locking mechanism is a pin, which is located in the lower middle part of the lifting tower. Multiple lifting towers are slidably connected in sequence, and mounting holes for installing the pin are installed at the connection positions of the multiple lifting towers.

[0019] The beneficial effect of adopting the above-mentioned further technical solution is that the pin locking between the tower sections serves as the excitation source. A pin locking structure is designed between each lifting tower section for constraint support. When the lifting structure is lifted into position, the self-excited vibration generated when the pins of each tower section are locked serves as the excitation, and the signal is acquired using a zero-frequency sensor, enabling modal testing of the heavy-duty high-lift structure. The pin locking between the tower sections serves as the excitation source.

[0020] Furthermore, the testing mechanism includes a zero-frequency sensor and testing instruments and equipment. The zero-frequency sensor is installed at the top of the lifting tower and is connected to the testing instruments and equipment.

[0021] The beneficial effects of adopting the above-mentioned further technical solution are as follows: A pin-locking structure is designed between each lifting tower section for constraint support. When the lifting structure is lifted into position, the self-excited vibration generated when the pins of each tower section lock serves as excitation, and a zero-frequency sensor is used to collect the signal, enabling modal testing of the heavy-duty high-lift structure. The pin locking between the tower sections is the excitation source. The zero-frequency sensor can collect signals starting from zero frequency and is installed at the top of each tower section of the lifting structure, connected to the testing instrument via a data cable for signal acquisition.

[0022] Furthermore, the testing equipment includes: a testing instrument and a computer, the zero-frequency sensor is attached to the top of the lifting tower, the zero-frequency sensor is connected to the testing instrument, and the testing instrument is connected to the computer.

[0023] The beneficial effects of adopting the above-mentioned further technical solution are: the test instrument and equipment include test instruments and a computer, which record the signal data collected by the zero-frequency sensor for frequency analysis.

[0024] The advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic flowchart illustrating the modal testing method for a lifting structure provided in an embodiment of the present invention.

[0027] Figure 2 This is one of the structural schematic diagrams of the lifting structure modal testing system provided in an embodiment of the present invention.

[0028] Figure 3 This is the second schematic diagram of the lifting structure modal testing system provided in an embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of the time-domain test results provided in an embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of the frequency domain analysis results provided in an embodiment of the present invention.

[0031] The following are the symbols and their meanings: 1. Lifting structure; 2. Zero-frequency sensor; 3. Testing instruments and equipment; 4. Pin. Detailed Implementation

[0032] The principles and features of the present invention are described below with reference to the accompanying drawings. The embodiments described are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0037] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0038] like Figure 1 As shown, this embodiment of the invention provides a modal testing method for a lifting structure, including: installing a detection mechanism and a locking mechanism on each lifting tower of the lifting structure; lifting the lifting tower of the lifting structure; locking and energizing the lifting tower through the locking mechanism; and detecting the modal information of the lifting structure through the detection mechanism.

[0039] The beneficial effects of adopting the technical solution of the present invention are as follows: each lifting tower section is designed with a locking mechanism for constraint support. When the lifting structure is lifted into place, the self-excited vibration generated when the locking mechanism of each tower section is locked serves as excitation, and the signal is collected by the detection mechanism, which can complete the modal test of the heavy-duty high lifting structure.

[0040] Modal testing, also known as experimental modal analysis, is a vibration test conducted to determine the modal parameters of a linear vibration system. Modal parameters are descriptions of the inherent characteristics of a vibration system in the frequency domain, generally referring to the system's natural frequencies, damping ratios, mode shapes, and modal masses. In modal testing, the system's modal parameters are obtained by measuring the response signal of a system under a given excitation and then applying modal parameter identification methods.

[0041] It should be noted that the modal testing method for lifting structures of the present invention can be applied to, but is not limited to, modal testing of lifting structures, and also provides a reference for the design and testing of similar structures.

[0042] Furthermore, the steps of locking and energizing the lifting tower through the locking mechanism include: locking the lifting tower with a pin and energizing the lifting tower with the self-excited vibration generated when the pin is locked.

[0043] The beneficial effects of adopting the above-mentioned further technical solution are as follows: A pin-locking structure is designed between each lifting tower section for constraint support. When the lifting structure is lifted into position, the self-excited vibration generated when the pins of each tower section are locked serves as excitation, and the signal is acquired using a zero-frequency sensor, enabling modal testing of the heavy-duty high-lift structure. The pin locking between the tower sections is the source of excitation.

[0044] Furthermore, the step of installing the detection mechanism and the locking mechanism on each lifting tower of the lifting structure includes: installing a zero-frequency sensor at the top of each lifting tower of the lifting structure; installing a locking mechanism in the middle and lower part of each lifting tower of the lifting structure; installing a load at the top of the lifting structure; and connecting the zero-frequency sensor to the testing instrument.

[0045] The beneficial effects of adopting the above-mentioned further technical solution are as follows: A pin-locking structure is designed between each lifting tower section for constraint support. When the lifting structure is lifted into position, the self-excited vibration generated when the pins of each tower section are locked serves as excitation, and a zero-frequency sensor is used to collect the signal, enabling modal testing of the heavy-duty high-lift structure. The heavy-duty high-lift structure is the test object, consisting of each lifting tower section and a top load. The zero-frequency sensor can collect signals starting from zero frequency. It is installed at the top of each tower section of the lifting structure and connected to the testing instrument via a data cable for signal acquisition.

[0046] Furthermore, in the step of installing zero-frequency sensors at the top of each lifting tower of the lifting structure, the zero-frequency sensors are affixed to the top of each lifting tower of the lifting structure; the step of connecting the zero-frequency sensors to the testing instruments includes: connecting the zero-frequency sensors to the testing instruments; connecting the testing instruments to a computer; and setting the parameters of the testing instruments.

[0047] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The testing equipment includes testing instruments and a computer, which records the signal data collected by the zero-frequency sensor for frequency analysis. Zero-frequency sensors are attached and fixed to the top of each tower section, and the sensors are connected to the testing instruments via data cables. The parameters of the testing instruments are set to ensure that the testing is in place.

[0048] Furthermore, prior to the step of installing the detection mechanism and locking mechanism on each lifting tower of the lifting structure, the following steps are included: leveling and tilting the lifting structure to facilitate the installation of the detection mechanism.

[0049] The beneficial effect of adopting the above-mentioned further technical solution is that the heavy-duty high-lift structure can be leveled and erected, and is ready to attach sensors.

[0050] Furthermore, the step of detecting the modal information of the lifting structure through the detection mechanism includes: recording the excitation vibration signal data triggered when the lifting structure is lifted into position and locked by the locking mechanism; and analyzing the excitation vibration signal data to obtain frequency data for different lifting tower heights.

[0051] The beneficial effects of adopting the above-mentioned further technical solution are: recording and storing the excitation vibration signal data triggered when the lifting pin locks in place, and analyzing the data, frequency data for different tower section heights can be obtained. Modal testing of heavy-duty high-lift structures at different lifting heights can be performed, providing structural data support, and finite element simulation models can be corrected based on the test results.

[0052] The present invention provides a modal testing method for a lifting structure, which can be used for modal testing of heavy-duty high-lift structures, including: S1: Level, flip and stand the heavy-duty high-lift structure (lifting structure 1) to enable the attachment of the sensor (zero-frequency sensor 2).

[0053] S2: Attach and fix the zero-frequency sensor at the top of each tower section (lifting tower), and connect the sensor (zero-frequency sensor 2) to the testing instrument via a data cable. Set the parameters of the testing instrument to ensure that it is ready for testing.

[0054] S3: The lifting tower is raised sequentially. Each tower section is locked and energized by a pin when it reaches its designated position. The excitation vibration signal data at the point of final elevation is recorded and stored. Figure 4 As shown.

[0055] Figure 4 In the diagram, the horizontal axis represents the test time, where Time is measured in seconds. 0.0 and 170.0 are the minimum and maximum values ​​of the horizontal axis, respectively, meaning 0.0 is the test start time and 170.0 is the test end time.

[0056] The vertical axis represents the measured amplitude, where Amplitude is expressed in degrees. 0 ), 14.1 and 15.4 are both measured tilt angle values.

[0057] according to Figure 4 The data shows that the lifting structure is swaying regularly, and the swaying period can be obtained, thus allowing the frequency value to be calculated.

[0058] S4: By analyzing the data, frequency data for different tower section heights can be obtained, such as... Figure 5 As shown.

[0059] Figure 5 In the diagram, the horizontal axis represents frequency, and Hz is the unit of the horizontal axis. 0.2 and 0.9 are the minimum and maximum values ​​of the horizontal axis coordinates, respectively. 0.41Hz is the frequency value of the lifting structure.

[0060] The vertical axis represents the amplitude. Amplitude indicates the amplitude, and 0.0 and 1.0 only indicate the amplification ratio and have no unit. The horizontal axis corresponding to the maximum amplification (peak value) is the structural frequency value.

[0061] according to Figure 5 The data clearly shows that the structural frequency is 0.41 Hz.

[0062] like Figure 2 and Figure 3 As shown, in addition, the present invention also provides a lifting structure modal testing system for implementing the lifting structure modal testing method described in any of the above claims. The lifting structure modal testing system includes: a lifting structure 1, multiple detection mechanisms and multiple locking mechanisms. The lifting structure 1 is provided with multiple lifting towers. The multiple detection mechanisms are respectively installed on the multiple lifting towers, and the multiple locking mechanisms are respectively installed on the multiple lifting towers.

[0063] The beneficial effects of adopting the technical solution of the present invention are as follows: each lifting tower section is designed with a locking mechanism for constraint support. When the lifting structure is lifted into place, the self-excited vibration generated when the locking mechanism of each tower section is locked serves as excitation, and the signal is collected by the detection mechanism, which can complete the modal test of the heavy-duty high lifting structure.

[0064] Furthermore, the locking mechanism is a pin 4, which is located in the lower middle part of the lifting tower. Multiple lifting towers are slidably connected in sequence, and mounting holes for installing the pin 4 are installed at the connection positions of the multiple lifting towers respectively.

[0065] The beneficial effect of adopting the above-mentioned further technical solution is that the pin locking between the tower sections serves as the excitation source. A pin locking structure is designed between each lifting tower section for constraint support. When the lifting structure is lifted into position, the self-excited vibration generated when the pins of each tower section are locked serves as the excitation, and the signal is acquired using a zero-frequency sensor, enabling modal testing of the heavy-duty high-lift structure. The pin locking between the tower sections serves as the excitation source.

[0066] Furthermore, the testing mechanism includes: a zero-frequency sensor 2 and a testing instrument 3. The zero-frequency sensor 2 is installed at the top of the lifting tower and is connected to the testing instrument 3.

[0067] The beneficial effects of adopting the above-mentioned further technical solution are as follows: A pin-locking structure is designed between each lifting tower section for constraint support. When the lifting structure is lifted into position, the self-excited vibration generated when the pins of each tower section lock serves as excitation, and a zero-frequency sensor is used to collect the signal, enabling modal testing of the heavy-duty high-lift structure. The pin locking between the tower sections is the excitation source. The zero-frequency sensor can collect signals starting from zero frequency and is installed at the top of each tower section of the lifting structure, connected to the testing instrument via a data cable for signal acquisition.

[0068] Furthermore, the testing instrument 3 includes a testing instrument and a computer. The zero-frequency sensor 2 is attached to the top of the lifting tower. The zero-frequency sensor 2 is connected to the testing instrument, and the testing instrument is connected to the computer.

[0069] The beneficial effects of adopting the above-mentioned further technical solution are: the test instrument and equipment include test instruments and a computer, which record the signal data collected by the zero-frequency sensor for frequency analysis.

[0070] The lifting structure modal testing system provided in this embodiment of the invention includes: a heavy-duty high lifting structure (lifting structure 1), a pin locking mechanism between each tower section (lifting tower) (i.e., a pin locking structure used for excitation), a zero-frequency sensor, testing instruments and equipment, etc.

[0071] The heavy-duty high-lift structure (lifting structure 1) is the test object, which consists of each section of the lifting tower and the heavy load at the top.

[0072] The locking pins between tower sections (lifting towers) serve as the source of the incentive.

[0073] The zero-frequency sensor can collect signals starting from zero frequency. It is installed on the top of each tower section of the lifting structure and connected to the testing instrument via a data cable to collect signals.

[0074] The testing equipment includes testing instruments and a computer, which records the signal data collected by the zero-frequency sensor for frequency analysis.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of modal testing of a lifting structure, characterized by, The method comprises the following steps: installing detection mechanisms and locking mechanisms on each lifting tower of the lifting structure; lifting the lifting towers of the lifting structure; locking and exciting the lifting towers by the locking mechanisms; detecting modal information of the lifting structure by the detection mechanisms.

2. The method of claim 1, wherein The step of locking and exciting the lifting towers by the locking mechanisms comprises locking the lifting towers by the bolts and exciting the lifting towers by the self-excited vibration generated when the bolts are locked.

3. The method of claim 1, wherein The step of installing detection mechanisms and locking mechanisms on each lifting tower of the lifting structure comprises: installing zero-frequency sensors at the top of each lifting tower of the lifting structure; installing locking mechanisms at the middle and lower part of each lifting tower of the lifting structure; installing a load at the top of the lifting structure; connecting the zero-frequency sensors with test instruments.

4. The method of claim 3, wherein In the step of installing zero-frequency sensors at the top of each lifting tower of the lifting structure, the zero-frequency sensors are pasted at the top of each lifting tower of the lifting structure. The step of connecting the zero-frequency sensors with test instruments comprises: connecting the zero-frequency sensors with test instruments; connecting the test instruments with computers; setting parameters of the test instruments.

5. The method of claim 1, wherein Before the step of installing detection mechanisms and locking mechanisms on each lifting tower of the lifting structure, the lifting structure is leveled and turned over to facilitate the installation of the detection mechanisms.

6. The method of claim 1, wherein The step of detecting modal information of the lifting structure by the detection mechanisms comprises: recording excitation vibration signal data caused when the lifting structure is lifted to the position and the locking mechanisms are locked; analyzing the excitation vibration signal data to obtain frequency data of different lifting towers.

7. A lifting structure modal testing system, characterized by, A lifting structure modal test method and system, the method comprising the following steps:

8. A lifting structure modal testing system according to claim 7, wherein, installing detection mechanisms and locking mechanisms on each lifting tower of the lifting structure; 9. The lift structure modal testing system of claim 7, wherein, lifting the lifting towers of the lifting structure; 10. A lifting structure modal testing system according to claim 9, wherein, locking and exciting the lifting towers by the locking mechanisms; detecting modal information of the lifting structure by the detection mechanisms. The locking mechanism is a bolt, the bolt is located at the middle and lower part of the lifting tower, the plurality of lifting towers are connected in sequence, and the mounting holes for mounting the bolts are installed at the connection positions of the plurality of lifting towers. The detection mechanism comprises a zero-frequency sensor and a test instrument device, the zero-frequency sensor is installed at the top of the lifting tower, and the zero-frequency sensor is connected with the test instrument device. The test instrument device comprises a test instrument and a computer, the zero-frequency sensor is pasted at the top of the lifting tower, the zero-frequency sensor is connected with the test instrument, and the test instrument is connected with the computer.

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