WO2023218668A1 - 加振力最適化システム、加振力最適化方法、及び演算装置 - Google Patents
加振力最適化システム、加振力最適化方法、及び演算装置 Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0066—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by exciting or detecting vibration or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
Definitions
- the present invention relates to an excitation force optimization system, an excitation force optimization method, and an arithmetic device.
- a modal experiment is an experiment in which any part of a structure is vibrated and the responses are observed at multiple locations in order to learn the natural frequency characteristics of the structure.
- the simplest and most common modal experiment is an experiment using an impulse hammer and an accelerometer.
- an impulse hammer strikes a structure manually, if the structure is a large structure such as a civil engineering structure, the attenuation becomes large, making it extremely difficult to measure an accurate frequency response function.
- Excitation force refers to the force that applies vibration to a structure.
- Nonlinearity refers to the property that the relationship between output and input is not proportional.
- Non-Patent Document 1 in a large structure, instead of one vibrator that applies a large excitation force to the structure, multiple vibrators that apply a small excitation force to the structure are used, Techniques have been described to more evenly distribute loads on structures.
- the purpose of the present disclosure which was made in view of the above circumstances, is to provide an arithmetic device for deriving a frequency response function of a structure, an excitation force optimization system and an excitation force optimization system for optimizing excitation force in deriving the frequency response function of a structure.
- An object of the present invention is to provide an excitation force optimization method.
- an excitation force optimization system is an excitation force optimization system that optimizes excitation force when deriving a frequency response function of a structure.
- a vibrator that excites the One or more accelerometers installed in the structure measure the vibration of the structure each time the structure is excited, and a frequency response function is derived based on the measured value of the vibration of the structure.
- an arithmetic device that controls the excitation force of the vibrator based on the frequency response function.
- the excitation force optimization method is an excitation force optimization method that optimizes the excitation force when deriving the frequency response function of a structure, and includes: a step of repeatedly exciting the structure by stepwise amplifying the excitation force using a vibrator; measuring vibrations of the structure excited by the vibration exciter using one or more accelerometers; using a calculation device to derive a frequency response function based on the measured value of vibration of the structure; After the calculation device derives a first frequency response function in which the frequency at which the peak of the frequency response function appears varies depending on the number of trials, the frequency at which the peak of the frequency response function that is equal to or higher than the first threshold value appears is determined by the number of trials.
- the arithmetic device derives a third frequency response function in which a peak of the frequency response function that is not present in the second frequency response function and is greater than or equal to the second threshold is derived, the third frequency response function outputting a frequency response function obtained by averaging the one or more recorded second frequency response functions; including.
- a computing device that derives a frequency response function of a structure, and includes a receiving unit that receives measured values of vibration of the structure from one or more accelerometers. a calculation unit that derives the frequency response function based on the measured value and controls the excitation force of the vibrator based on the frequency response function; and a display unit that displays and visualizes the frequency response function. and a recording unit that records the frequency response function. Equipped with
- the excitation force optimization system since the optimal excitation force for a structure is automatically searched, an accurate frequency response function can be derived regardless of the skills and know-how of engineers. .
- FIG. 1 is a block diagram illustrating a configuration example of an excitation force optimization system according to an embodiment of the present disclosure.
- FIG. 1 is a schematic diagram of an excitation force optimization system according to an embodiment of the present disclosure. It is a graph showing a frequency response function in which the excitation force is in an appropriate range. It is a graph showing a frequency response function in a range where the excitation force is excessive.
- FIG. 1 is a block diagram illustrating a configuration example of an arithmetic device according to an embodiment of the present disclosure.
- 1 is a flowchart illustrating an example of an excitation force optimization method executed by an excitation force optimization system according to an embodiment of the present disclosure.
- 1 is a flowchart illustrating an example of an excitation force optimization method executed by an excitation force optimization system according to an embodiment of the present disclosure.
- 1 is a block diagram showing a schematic configuration of a computer functioning as an arithmetic device.
- an excitation force optimization system 1 which includes a calculation flow that amplifies the excitation force in stages (step amplification) and searches for an excitation force in which such a pseudo peak does not appear.
- FIG. 1 is a block diagram showing a configuration example of an excitation force optimization system 1 according to an embodiment of the present disclosure.
- the excitation force optimization system 1 includes a vibrator 10, one or more accelerometers 20, and an arithmetic device 30.
- the excitation force optimization system 1 optimizes the excitation force when deriving a frequency response function of a structure.
- FIG. 2 is a schematic diagram of an excitation force optimization system according to an embodiment of the present disclosure.
- the structure (object to be monitored) 40 is a pipe (tubular structure), and is attached to supporting hardware 41 at both ends with U bolts 42.
- the vibrator 10 applies an excitation force to the structure 40, the structure 40 vibrates.
- One or more accelerometers 20 (20-1 to 20-n) are attached to the structure 40, and the one or more accelerometers 20 measure vibrations of the structure 40.
- the measured value of the vibration of the structure 40 is transmitted to the arithmetic device 30 by wire or wirelessly, and the arithmetic device 30 derives a frequency response function of the structure 40 based on the measured value.
- the vibrator 10 vibrates the structure 40.
- the vibrator 10 first vibrates the structure 40 with an extremely small excitation force, and then amplifies the excitation force stepwise to repeatedly vibrate the structure 40.
- the vibrator 10 is a modal vibrator.
- the excitation force optimization system 1 When the excitation force optimization system 1 is activated, the vibrator 10 excites the structure 40 with an excessively small excitation force.
- the vibrator 10 vibrates the structure 40 by amplifying the vibrating force in stages (step amplification) according to instructions from the arithmetic unit 30, as described later.
- One or more accelerometers 20 are installed in the structure 40 and measure vibrations of the structure 40 every time the structure 40 is excited. As shown in FIG. 1, the one or more accelerometers 20 are comprised of n accelerometers 20-1 to 20-n.
- the accelerometer 20-1 includes a measuring section 21-1 that measures the vibration of the structure 40, and a transmitting section 22-1 that transmits the measured value to the receiving section 31 of the arithmetic device 30.
- the accelerometers 20-2 to 20-n also have similar configurations and functions.
- the calculation device 30 derives a frequency response function based on the measured value of vibration of the structure 40.
- FIG. 3 is a graph showing a frequency response function when the excitation force is within an appropriate range.
- FIG. 4 is a graph showing a frequency response function when the excitation force is excessive. 3 and 4 show the imaginary part of the frequency response function.
- the frequency response function has a small attenuation and a sharp peak b.
- the frequency response function has a peak a1 (pseudo peak a1) in a frequency band that does not exist in the frequency response function of Fig. 3. In the frequency band in which peak b appears in FIG. 3, a peak a2 with a less sharp rise appears.
- the frequency response functions shown in FIGS. 3 and 4 are superimposed frequency response functions derived from the measurement values of each of the n accelerometers.
- the arithmetic device 30 controls the excitation force of the vibrator based on the frequency response function.
- trial refers to amplifying the excitation force in stages to derive a frequency response function.
- the arithmetic device 30 repeats the trial a plurality of times (N times) and compares the plurality of frequency response functions recorded in each trial. When it is determined that the frequency response function is a first frequency response function A in which the frequency at which the peak of the frequency response function appears varies depending on the number of trials (no reproducibility), the arithmetic unit 30 applies the excitation force to the first frequency response function A. Amplify.
- the arithmetic device 30 uses a second frequency response function B in which the frequency response function has a constant (reproducible) frequency at which a peak of the frequency response function that is equal to or higher than the first threshold appears regardless of the number of trials. If it is determined that there is, the second frequency response function B is recorded and the excitation force is amplified. (iii) The arithmetic device 30 determines that the frequency response function is a third frequency response function C that does not exist in the second frequency response function and exhibits a peak of the frequency response function that is greater than or equal to the second threshold. If so, the most recent third frequency response function C is discarded, and the average value of one or more second frequency response functions B is output.
- FIG. 5 is a block diagram illustrating a configuration example of an arithmetic device according to an embodiment of the present disclosure.
- the computing device 30 includes a receiving section 31, a computing section 32, a display section 33, and a recording section 34. Arithmetic device 30 derives a frequency response function of the structure.
- the calculation unit 32 constitutes a control calculation circuit (controller) 50.
- the control calculation circuit 50 may be configured by dedicated hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array), or may be configured by a processor, or may be configured by including both. may be done.
- ASIC Application Specific Integrated Circuit
- FPGA Field-Programmable Gate Array
- the receiving unit 31 receives the measured value of the vibration frequency of the structure 40 from the transmitting unit (22-1 to 22-n) of one or more accelerometers 20.
- the calculation unit 32 derives a frequency response function based on the measured value of the vibration frequency of the structure 40, and controls the excitation force of the vibrator 10 based on the frequency response function. (i) The calculation unit 32 repeats the trial a plurality of times (N times), and compares the plurality of frequency response functions recorded in the recording unit 34 for each trial. When it is determined that the frequency response function is a first frequency response function A in which the frequency at which the peak of the frequency response function appears varies depending on the number of trials (without reproducibility), the calculation unit 32 applies the excitation force to the first frequency response function A. Amplify.
- the calculation unit 32 uses a second frequency response function B in which the frequency at which the peak of the frequency response function that is equal to or higher than the first threshold value appears is constant (reproducible) regardless of the number of trials. If it is determined that there is, the second frequency response function B is recorded and the excitation force is amplified. (iii) The calculation unit 32 determines that the frequency response function is a third frequency response function C that does not exist in the second frequency response function and exhibits a peak of the frequency response function that is greater than or equal to the second threshold. If so, the most recent third frequency response function C is discarded, and the average value of one or more second frequency response functions B is output.
- the display unit 33 displays and visualizes the frequency response function.
- the display section 33 is a display.
- the display unit 33 determines whether the derived frequency response function is the first frequency response function A, the second frequency response function B, or the third frequency response function C. Display and visualize all frequency response functions on the display.
- the recording unit 34 records the frequency response function.
- the recording unit 34 stores one or more second frequency response functions B in response to a request from the calculation unit 32 when the calculation unit 32 averages the recorded one or more second frequency response functions B. Output to 32.
- FIGS. 6A and 6B are flowcharts illustrating an example of an excitation force optimization method executed by an excitation force optimization system according to an embodiment of the present disclosure.
- step S101 the vibrator 10 vibrates the structure 40 with an excessively small excitation force.
- step S102 the measurement units 21-1 to 21-n of one or more accelerometers 20 measure vibrations of the structure 40.
- the transmitting units 22-1 to 22-n of one or more of the accelerometers 20 transmit measured values of vibration of the structure 40 to the receiving unit 31 of the arithmetic device 30.
- step S103 the calculation unit 32 of the calculation device 30 derives a frequency response function based on the received measurement value, and causes the display unit 33 of the calculation device 30 to display the derived frequency response function.
- step S104 the recording unit 34 of the arithmetic device 30 records the derived frequency response function.
- step S105 the calculation unit 32 of the calculation device 30 determines whether the number of trials has reached N times. If the N times have not been reached, the process advances to step S106; if the N times have been reached, the process advances to step S107.
- step S106 the vibration exciter 10 amplifies the excitation force and vibrates the structure 40 according to instructions from the calculation unit 32 of the calculation device 30. Thereafter, the process returns to step S102, and the measurement units 21-1 to 21-n of one or more accelerometers 20 measure vibrations of the structure 40.
- step S107 the calculation unit 32 of the calculation device 30 compares the frequency response functions recorded in the recording unit 34, and determines whether the derived frequency response function is the first frequency response function A or the second frequency response function B. Determine which of the following. If it is the second frequency response function B, the process advances to step S108. If it is the first frequency response function A, the process advances to step S106.
- step S108 the calculation unit 32 of the calculation device 30 causes the recording unit 14 to record the derived second frequency response function B, and displays it on the display unit 33.
- step S109 the vibrator 10 amplifies the excitation force in stages to vibrate the structure 40 according to instructions from the arithmetic unit 32 of the arithmetic device 30.
- step S110 the measurement units 21-1 to 21-n of one or more accelerometers 20 measure vibrations of the structure 40.
- the transmitting units 22-1 to 22-n of one or more of the accelerometers 20 transmit measured values of vibration of the structure 40 to the receiving unit 31 of the arithmetic device 30.
- step S111 the calculation unit 32 of the calculation device 30 derives a frequency response function based on the received measurement value, and causes the display unit 33 of the calculation device 30 to display the derived frequency response function.
- step S112 the calculation unit 32 of the calculation device 30 determines whether the derived frequency response function is the second frequency response function B or the third frequency response function C. If it is the second frequency response function B, the process advances to step S108. If it is the third frequency response function C, the process advances to step S113.
- step S113 the most recent third frequency response function C is discarded, and a frequency response function obtained by averaging one or more second frequency response functions B recorded in the recording unit 34 is output.
- the excitation force optimization system 1 applies the excitation force to the vibrator 10 in stages based on information on a frequency response function derived from measured values of vibration of a large structure by one or more accelerometers 20.
- the system has a system configuration that adjusts the excitation force by feeding back specific amplification instructions. According to the excitation force optimization system 1, since the system automatically searches for the optimal excitation force, an accurate frequency response function can be derived regardless of the skills and know-how of the engineer.
- FIG. 7 is a block diagram showing a schematic configuration of a computer functioning as the arithmetic device 30.
- the computer functioning as the arithmetic device 30 may be a general-purpose computer, a dedicated computer, a workstation, a PC (Personal Computer), an electronic notepad, or the like.
- Program instructions may be program code, code segments, etc. to perform necessary tasks.
- the computer 100 communicates with a processor 110, a ROM (Read Only Memory) 120, a RAM (Random Access Memory) 130, and a storage 140 as storage units, an input unit 150, an output unit 160, and An interface (I/F) 170 is provided.
- a processor 110 a ROM (Read Only Memory) 120
- a RAM Random Access Memory
- storage 140 storage units
- I/F An interface
- the ROM 120 stores various programs and various data.
- the RAM 130 temporarily stores programs or data as a work area.
- the storage 140 is configured with an HDD (Hard Disk Drive) or an SSD (Solid State Drive), and stores various programs including an operating system and various data.
- a program according to the present disclosure is stored in the ROM 120 or the storage 140.
- the processor 110 is a CPU (Central Processing Unit), MPU (Micro Processing Unit), GPU (Graphics Processing Unit), DSP (Digital Signal Processor), SoC (System on a Chip), etc., and may be of the same or different type. It may be configured with a plurality of processors.
- the processor 110 reads a program from the ROM 120 or the storage 140 and executes the program using the RAM 130 as a work area, thereby controlling each of the above components and performing various calculation processes. Note that at least a part of these processing contents may be realized by hardware.
- the program may be recorded on a recording medium readable by the arithmetic device 30.
- a recording medium By using such a recording medium, it is possible to install a program on the arithmetic device 30.
- the recording medium on which the program is recorded may be a non-transitory recording medium.
- the non-transitory recording medium is not particularly limited, and may be, for example, a CD-ROM, a DVD-ROM, a USB (Universal Serial Bus) memory, or the like.
- this program may be downloaded from an external device via a network.
- An excitation force optimization system that optimizes excitation force in deriving a frequency response function of a structure, a vibrator that vibrates the structure; one or more accelerometers installed in the structure that measures vibrations of the structure each time the structure is vibrated;
- An excitation force optimization system comprising: a calculation device that derives a frequency response function based on a measured value of vibration of the vibration exciter, and controls an excitation force of the vibrator based on the frequency response function.
- the frequency response function is a first frequency response function in which the frequency at which the peak of the frequency response function appears varies depending on the number of trials, the arithmetic device amplifies the excitation force and adjusts the frequency response function.
- the frequency response function is a second frequency response function in which the frequency at which the peak of the frequency response function that is equal to or higher than the first threshold appears is constant regardless of the number of trials, the second frequency response function is recorded, and
- the frequency response function is a third frequency response function in which a peak of the frequency response function that is not present in the second frequency response function and is equal to or higher than a second threshold appears.
- the excitation force optimization system according to supplementary note 1, wherein the third frequency response function is discarded and an average value of the second frequency response function is output.
- a calculation device for deriving a frequency response function of a structure a receiver that receives measurements of vibrations of the structure from one or more accelerometers; a controller that derives the frequency response function based on the measured value and controls the excitation force of the exciter based on the frequency response function; a display that displays and visualizes the frequency response function; a memory for recording the frequency response function;
- a calculation device comprising: (Additional note 4) The controller amplifies the excitation force when the frequency response function is a first frequency response function in which the frequency at which the peak of the frequency response function appears varies depending on the number of trials; , in the case of a second frequency response function in which the frequency at which the peak of the frequency response function that is equal to or higher than the first threshold appears is constant regardless of the number of trials, the second frequency response function is recorded, and the When the excitation force is amplified and the frequency response function is a third frequency response function in which a peak of the frequency response function that is not present in the second frequency response
- An excitation force optimization method for optimizing excitation force when deriving a frequency response function of a structure, the excitation force being amplified in stages using a vibrator and repeatedly vibrating the structure.
- one or more accelerometers measure the vibration of the structure excited by the vibrator
- a calculation device derives a frequency response function based on the measured value of the vibration of the structure
- the second frequency response function When a second frequency response function that is constant regardless of the frequency response function is derived, the second frequency response function is recorded, and the arithmetic unit calculates a value equal to or higher than a second threshold that does not exist in the second frequency response function.
- the third frequency response function When a third frequency response function in which a peak of the frequency response function appears is derived, the third frequency response function is discarded, and the one or more recorded second frequency response functions are averaged.
- An excitation force optimization method that outputs a frequency response function.
- Excitation force optimization system 10
- Vibrator 20 One or more accelerometers 20-1 to 20-n Accelerometers 21-1 to 21-n Measurement section 22-1 to 22-n transmitter 30
- Arithmetic device 31
- Receiving section (receiver) 32
- Arithmetic unit 33
- Display section (display) 34
- Recording section (memory) 40
- Structures (objects to be monitored) 41
- Support hardware 42
- Control calculation circuit (controller) 100
- Computer 110 120
- ROM 130 RAM 140 Storage 150
- Input section 160
- Output section 170 Communication interface (I/F) 180 bus
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Abstract
Description
前記構造物が加振される度に、前記構造物の振動を計測する、前記構造物に設置された1以上の加速度計と、前記構造物の振動の計測値に基づいて周波数応答関数を導出するとともに、該周波数応答関数に基づいて前記加振器の加振力を制御する演算装置と、を備える。
加振器により、加振力を段階的に増幅させて繰り返し前記構造物を加振するステップと、
1以上の加速度計により、前記加振器により加振された前記構造物の振動を計測するステップと、
演算装置により、前記構造物の振動の計測値に基づいて、周波数応答関数を導出するステップと、
前記演算装置により、前記周波数応答関数のピークが発現する周波数が試行回数によって異なる第1の周波数応答関数が導出された後に、第1の閾値以上の周波数応答関数のピークが発現する周波数が試行回数によらず一定である第2の周波数応答関数が導出されると、該第2の周波数応答関数を記録するステップと、
前記演算装置により、前記第2の周波数応答関数には存在しない、第2の閾値以上の周波数応答関数のピークが発現する第3の周波数応答関数が導出されると、該第3の周波数応答関数を破棄して、記録された1以上の前記第2の周波数応答関数を平均化した周波数応答関数を出力するステップと、
を含む。
を備える。
図1は、本開示の一実施形態に係る加振力最適化システム1の構成例を示すブロック図である。図1に示すように、加振力最適化システム1は、加振器10と、1以上の加速度計20と、演算装置30と、を備える。加振力最適化システム1は、構造物の周波数応答関数の導出にあたり、加振力を最適化する。
図5は、本開示の一実施形態に係る演算装置の構成例を示すブロック図である。図5に示すように、演算装置30は、受信部31と、演算部32と、表示部33と、記録部34とを備える。演算装置30は、構造物の周波数応答関数を導出する。演算部32により制御演算回路(コントローラ)50が構成される。制御演算回路50は、ASIC(Application Specific Integrated Circuit)、FPGA(Field-Programmable Gate Array)等の専用のハードウェアによって構成されてもよいし、プロセッサによって構成されてもよいし、双方を含んで構成されてもよい。
構造物の周波数応答関数の導出にあたり、加振力を最適化する加振力最適化システムであって、
前記構造物の加振を行う加振器と、前記構造物が加振される度に、前記構造物の振動を計測する、前記構造物に設置された1以上の加速度計と、前記構造物の振動の計測値に基づいて周波数応答関数を導出するとともに、該周波数応答関数に基づいて前記加振器の加振力を制御する演算装置と、を備える加振力最適化システム。
(付記項2)
前記演算装置は、前記周波数応答関数が、前記周波数応答関数のピークが発現する周波数が試行回数によって異なる第1の周波数応答関数である場合には、前記加振力を増幅し、前記周波数応答関数が、第1の閾値以上の周波数応答関数のピークが発現する周波数が試行回数によらず一定である第2の周波数応答関数である場合には、該第2の周波数応答関数を記録するとともに、前記加振力を増幅し、前記周波数応答関数が、前記第2の周波数応答関数には存在しない、第2の閾値以上の周波数応答関数のピークが発現する第3の周波数応答関数である場合には、該第3の周波数応答関数を破棄しするとともに、前記第2の周波数応答関数の平均値を出力する、付記項1に記載の加振力最適化システム。
(付記項3)
構造物の周波数応答関数を導出する演算装置であって、
1以上の加速度計から前記構造物の振動の計測値を受信するレシーバーと、
前記計測値に基づいて前記周波数応答関数を導出するとともに、前記周波数応答関数に基づいて加振器の加振力を制御するコントローラと、
前記周波数応答関数を表示して可視化するディスプレイと、
前記周波数応答関数を記録するメモリーと、
を備える演算装置。
(付記項4)
前記コントローラは、前記周波数応答関数が、前記周波数応答関数のピークが発現する周波数が試行回数によって異なる第1の周波数応答関数である場合には、前記加振力を増幅し、前記周波数応答関数が、第1の閾値以上の周波数応答関数のピークが発現する周波数が試行回数によらず一定である第2の周波数応答関数である場合には、該第2の周波数応答関数を記録するとともに、前記加振力を増幅し、前記周波数応答関数が、前記第2の周波数応答関数には存在しない、第2の閾値以上の周波数応答関数のピークが発現する第3の周波数応答関数である場合には、該第3の周波数応答関数を破棄するとともに、前記第2の周波数応答関数の平均値を出力する、付記項3に記載の演算装置。
(付記項5)
構造物の周波数応答関数の導出にあたり、加振力を最適化する加振力最適化方法であって、加振器により、加振力を段階的に増幅させて繰り返し前記構造物を加振し、1以上の加速度計により、前記加振器により加振された前記構造物の振動を計測し、演算装置により、前記構造物の振動の計測値に基づいて、周波数応答関数を導出し、前記演算装置により、前記周波数応答関数のピークが発現する周波数が試行回数によって異なる第1の周波数応答関数が導出された後に、第1の閾値以上の周波数応答関数のピークが発現する周波数が試行回数によらず一定である第2の周波数応答関数が導出されると、該第2の周波数応答関数を記録し、前記演算装置により、前記第2の周波数応答関数には存在しない、第2の閾値以上の周波数応答関数のピークが発現する第3の周波数応答関数が導出されると、該第3の周波数応答関数を破棄して、記録された1以上の前記第2の周波数応答関数を平均化した周波数応答関数を出力する加振力最適化方法。
10 加振器
20 1以上の加速度計
20-1~20-n 加速度計
21-1~21-n 計測部
22-1~22-n 送信部
30 演算装置
31 受信部(レシーバー)
32 演算部
33 表示部(ディスプレイ)
34 記録部(メモリー)
40 構造物(監視対象物)
41 支持金物
42 Uボルト
50 制御演算回路(コントローラ)
100 コンピュータ
110 プロセッサ
120 ROM
130 RAM
140 ストレージ
150 入力部
160 出力部
170 通信インターフェース(I/F)
180 バス
Claims (5)
- 構造物の周波数応答関数の導出にあたり、加振力を最適化する加振力最適化システムであって、
前記構造物の加振を行う加振器と、
前記構造物が加振される度に、前記構造物の振動を計測する、前記構造物に設置された1以上の加速度計と、
前記構造物の振動の計測値に基づいて周波数応答関数を導出するとともに、該周波数応答関数に基づいて前記加振器の加振力を制御する演算装置と、
を備える加振力最適化システム。 - 前記演算装置は、
前記周波数応答関数が、前記周波数応答関数のピークが発現する周波数が試行回数によって異なる第1の周波数応答関数である場合には、前記加振力を増幅し、
前記周波数応答関数が、第1の閾値以上の周波数応答関数のピークが発現する周波数が試行回数によらず一定である第2の周波数応答関数である場合には、該第2の周波数応答関数を記録するとともに、前記加振力を増幅し、
前記周波数応答関数が、前記第2の周波数応答関数には存在しない、第2の閾値以上の周波数応答関数のピークが発現する第3の周波数応答関数である場合には、該第3の周波数応答関数を破棄するとともに、前記第2の周波数応答関数の平均値を出力する、請求項1に記載の加振力最適化システム。 - 構造物の周波数応答関数を導出する演算装置であって、
1以上の加速度計から前記構造物の振動の計測値を受信する受信部と、
前記計測値に基づいて前記周波数応答関数を導出するとともに、前記周波数応答関数に基づいて加振器の加振力を制御する演算部と、
前記周波数応答関数を表示して可視化する表示部と、
前記周波数応答関数を記録する記録部と、
を備える演算装置。 - 前記演算部は、
前記周波数応答関数が、前記周波数応答関数のピークが発現する周波数が試行回数によって異なる第1の周波数応答関数である場合には、前記加振力を増幅し、
前記周波数応答関数が、第1の閾値以上の周波数応答関数のピークが発現する周波数が試行回数によらず一定である第2の周波数応答関数である場合には、該第2の周波数応答関数を記録するとともに、前記加振力を増幅し、
前記周波数応答関数が、前記第2の周波数応答関数には存在しない、第2の閾値以上の周波数応答関数のピークが発現する第3の周波数応答関数である場合には、該第3の周波数応答関数を破棄するとともに、前記第2の周波数応答関数の平均値を出力する、請求項3に記載の演算装置。 - 構造物の周波数応答関数の導出にあたり、加振力を最適化する加振力最適化方法であって、
加振器により、加振力を段階的に増幅させて繰り返し前記構造物を加振するステップと、
1以上の加速度計により、前記加振器により加振された前記構造物の振動を計測するステップと、
演算装置により、前記構造物の振動の計測値に基づいて、周波数応答関数を導出するステップと、
前記演算装置により、前記周波数応答関数のピークが発現する周波数が試行回数によって異なる第1の周波数応答関数が導出された後に、第1の閾値以上の周波数応答関数のピークが発現する周波数が試行回数によらず一定である第2の周波数応答関数が導出されると、該第2の周波数応答関数を記録するステップと、
前記演算装置により、前記第2の周波数応答関数には存在しない、第2の閾値以上の周波数応答関数のピークが発現する第3の周波数応答関数が導出されると、該第3の周波数応答関数を破棄して、記録された1以上の前記第2の周波数応答関数を平均化した周波数応答関数を出力するステップと、
を含む加振力最適化方法。
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07167736A (ja) * | 1993-12-15 | 1995-07-04 | Hitachi Ltd | モーダルダンピング評価装置 |
| JP2006284340A (ja) * | 2005-03-31 | 2006-10-19 | Fuji Heavy Ind Ltd | 剛性計測装置、及び、剛性計測方法 |
| JP2018163042A (ja) * | 2017-03-27 | 2018-10-18 | Jfeスチール株式会社 | 自動車車体の動的剛性試験方法 |
| CN113155385A (zh) * | 2021-06-09 | 2021-07-23 | 南京航空航天大学 | 一种用于多振动台冲击加随机振动试验的系统及方法 |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07167736A (ja) * | 1993-12-15 | 1995-07-04 | Hitachi Ltd | モーダルダンピング評価装置 |
| JP2006284340A (ja) * | 2005-03-31 | 2006-10-19 | Fuji Heavy Ind Ltd | 剛性計測装置、及び、剛性計測方法 |
| JP2018163042A (ja) * | 2017-03-27 | 2018-10-18 | Jfeスチール株式会社 | 自動車車体の動的剛性試験方法 |
| CN113155385A (zh) * | 2021-06-09 | 2021-07-23 | 南京航空航天大学 | 一种用于多振动台冲击加随机振动试验的系统及方法 |
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