CN203337254U - Measurement system for corner freedom degree frequency-response function of mechanical structural member - Google Patents
Measurement system for corner freedom degree frequency-response function of mechanical structural member Download PDFInfo
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- CN203337254U CN203337254U CN2013204191390U CN201320419139U CN203337254U CN 203337254 U CN203337254 U CN 203337254U CN 2013204191390 U CN2013204191390 U CN 2013204191390U CN 201320419139 U CN201320419139 U CN 201320419139U CN 203337254 U CN203337254 U CN 203337254U
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Abstract
The utility model discloses a measurement system for the corner freedom degree frequency-response function of a mechanical structural member. The measurement system comprises an LMS vibration and modal analyzer, an excitation force hammer, a computer and three acceleration sensors, wherein the signal transmission ports of the three acceleration sensors and the signal transmission port of the excitation force hammer are connected with the corresponding signal input-output ports of the LMS vibration and modal analyzer respectively; and the communication port of the LMS vibration and modal analyzer is connected with the communication port of the computer. The measurement system disclosed by the utility model is simple in operation and implementation processes, the measured corner freedom degree frequency-response function is high in accuracy; and moreover, the measurement system disclosed by the utility model is low in cost and easy to popularize.
Description
Technical field
The utility model relates to a kind of mechanical structured member rotational degree of freedom frequency response function and measures system, belongs to the vibration test technology field.
Background technology
Obtaining frequency response function is the basis of research mechanical structured member kinetic property, in fields such as structural design, vibration analysis, fault vibrations, measuring frequency response function is one of very important element task, always is subject to the extensive concern of engineering technical personnel and researcher.
The determination techniques of the translational degree of freedom frequency response function of mechanical structured member is comparatively ripe, yet the mensuration of its rotational degree of freedom frequency response function is also comparatively difficult.
At present, measure the rotational degree of freedom frequency response function and mainly adopt Laser doppler seanning or rotational response sensor.While using Laser doppler seanning to measure, around tested mechanical structured member, to there be enough spaces to lay tripod and Laser doppler seanning, before each mensuration, all want pre-thermal instrument more than 20 minutes, and repeatedly debug laser beam, to meet accuracy requirement, implementation process is very loaded down with trivial details, and the price of Laser doppler seanning is very expensive.And although use rotational response sensor can directly determine the rotational degree of freedom frequency response function rapidly, but the manufacturing technology of this rotational response sensor is still immature, occasion that can only be not high for accuracy requirement, and price is very expensive, on market, is difficult at home buy.
The utility model content
The purpose of this utility model is to provide a kind of mechanical structured member rotational degree of freedom frequency response function to measure system, and this system operation implementation process is simple, and the rotational degree of freedom frequency response function precision determined is high, and this system cost is low, is easy to promote.
To achieve these goals, the utility model has adopted following technical scheme:
A kind of mechanical structured member rotational degree of freedom frequency response function is measured system, it is characterized in that: it comprises LMS vibration and model analysis instrument, exciting force hammer, computing machine and three acceleration transducers, wherein: the signal transmission port of the signal transmission port of three these acceleration transducers, this exciting force hammer is connected with the corresponding signal input/output port of model analysis instrument with this LMS vibration respectively, and this LMS vibration is connected with the PORT COM of this computing machine with the PORT COM of model analysis instrument.
Three described acceleration transducers are arranged on flexible attachment, this flexible attachment comprises carves graduated flat board, offer the through hole of strip on this flat board, run through in this through hole and be provided with three positioning unit parts, on each this positioning unit part, a described acceleration transducer is installed, wherein: this positioning unit part comprises collet, described acceleration transducer is fixed at the top of this collet, the bottom of this collet is connected with an end of the sliding axle that runs through this through hole setting, the other end and the set nut of this sliding axle are spirally connected, this collet and this set nut lay respectively at this dull and stereotyped both sides.Described flexible attachment is that plastic material is made.
Described acceleration transducer is piezoelectric acceleration transducer.Described piezoelectric acceleration transducer is PCB333B type piezoelectric acceleration transducer.
Described exciting force hammer is for having the exciting force hammer of CL-YD-315 type piezoelectric type Quartz Force Sensor.
The utility model has the advantages that:
1, the vibration of the LMS in the utility model is all the common instrument and equipment in vibration-testing field with model analysis instrument, acceleration transducer, exciting force hammer, be easy to obtain, thereby, with Laser doppler seanning or rotational response sensor, to compare, cost of the present utility model is low.
2, the utility model operation implementation process is simple, and without loaded down with trivial details debugging, the rotational degree of freedom frequency response function of tested mechanical structured member can directly be calculated and be drawn out by computing machine.
3, the translational degree of freedom frequency response function of the utility model based under the power excitation determines the rotational degree of freedom frequency response function, has science, and the precision of the rotational degree of freedom frequency response function determined is high, can meet the accuracy requirement of this area.
The accompanying drawing explanation
Fig. 1 is composition schematic diagram of the present utility model.
Fig. 2 is the structural representation of the flexible attachment in the utility model.
Fig. 3 is the schematic top plan view of Fig. 2.
Fig. 4 a is the translational degree of freedom frequency response function H under the power excitation
yFcurve map.
Fig. 4 b is the translational degree of freedom frequency response function H under Moment Excitation
yMcurve map.
Fig. 4 c is the rotational degree of freedom frequency response function H under the power excitation
θ Fcurve map.
Fig. 4 d is the rotational degree of freedom frequency response function H under Moment Excitation
θ Mcurve map.
Embodiment
As shown in Figure 1, the utility model mechanical structured member rotational degree of freedom frequency response function mensuration system comprises LMS vibration and model analysis instrument 10, exciting force hammer 20, computing machine 30 and three acceleration transducers 40, wherein: the signal transmission port of the signal transmission port of three these acceleration transducers 40, this exciting force hammer 20 is connected with the corresponding signal input/output port of model analysis instrument 10 with this LMS vibration respectively, and this LMS vibration is connected with the PORT COM of this computing machine 30 with the PORT COM of model analysis instrument 10.
In actual design, in order to simplify the step that between each acceleration transducer, spacing arranges, can be designed with for locating in advance the flexible attachment of spacing between each acceleration transducer.As shown in Figures 2 and 3, three these acceleration transducers 40 are arranged on flexible attachment, this flexible attachment comprises strip, be carved with the flat board 61 of scale 66, offer the through hole 62 of strip on this flat board 61, run through in this through hole 62 and be provided with three positioning unit parts, on each this positioning unit part, an acceleration transducer 40 is installed, wherein: this positioning unit part comprises collet 63, the top of this collet 63 is acceleration transducer 40 fixedly, the bottom of this collet 63 is connected with an end of the sliding axle 64 that runs through these through hole 62 settings, this sliding axle 64 can slide in this through hole 62, the other end of this sliding axle 64 and set nut 65 are spirally connected, this collet 63 and this set nut 65 lay respectively at the both sides of this flat board 61.In order not affect the mensuration precision, can be provided with center tag line (not shown) on acceleration transducer 40, flexible attachment selects plastic material to make.
In actual design, acceleration transducer 40 is chosen as piezoelectric acceleration transducer.Further, piezoelectric acceleration transducer is chosen as PCB333B type piezoelectric acceleration transducer.In addition, the connecting line between acceleration transducer 40 and LMS vibration and model analysis instrument 10 can adopt the coaxial radio-frequency data line.
In actual design, exciting force hammer 20 is chosen as Sinocera exciting force hammer that produce, that have CL-YD-315 type piezoelectric type Quartz Force Sensor.
In the utility model, the LMS vibration is known device or the device of this area with model analysis instrument 10, exciting force hammer 20, computing machine 30, acceleration transducer 40, therefore here do not describe in detail.
During mensuration, start LMS vibration and model analysis instrument 10 and computing machine 30, under the mensuration software environment of installing at computing machine 30, three acceleration transducers 40, exciting force hammer 20 and LMS vibration are debugged with model analysis instrument 10.
After debugging is good, play tested mechanical structured member 50 by rope hanging, three acceleration transducers 40 to having had good positioning on flexible attachment are arranged on this tested mechanical structured member 50, it should be noted that, the spacing of regulating between three acceleration transducers 40 by flexible attachment is very easily, be specially: the slip by sliding axle 64 in through hole 62, make that acceleration transducer 40 mediated move to suitable position, then tighten set nut 65, make set nut 65, collet 63 is supported with dull and stereotyped 61 lockings, thereby this acceleration transducer 40 that will mediate is fixed, then, by identical mode, the acceleration transducer 40 that will be positioned at these acceleration transducer 40 left and right sides is fixed respectively, should keep the same apart from s between the acceleration transducer 40 center of the left and right sides and the acceleration transducer 40 center mediated, s is between 0.5 centimetre to 3 centimetres, preferred values is 1 centimetre.Perhaps do not use flexible attachment, directly three acceleration transducers 40 are arranged on this tested mechanical structured member 50.On tested mechanical structured member 50, an acceleration transducer 40 should be arranged in the center in zone to be measured on this tested mechanical structured member 50, two other acceleration transducer 40 lays respectively at the left and right sides of the acceleration transducer 40 in regional center to be measured, and between these two acceleration transducer 40 centers and acceleration transducer 40 center in regional center to be measured should be the same apart from s, s is between 0.5 centimetre to 3 centimetres, preferred values is 1 centimetre, and three acceleration transducers 40 should be on same straight line.
After installing acceleration transducer 40, knock position corresponding with the acceleration transducer 40 of arranging on tested mechanical structured member 50 with exciting force hammer 20, thereby, the force signal that applies that power sensor on exciting force hammer 20 detects it sends LMS vibration and model analysis instrument 10 to, simultaneously, the acceleration signal that three acceleration transducers 40 will detect separately sends LMS vibration and model analysis instrument 10 to, LMS vibration and all signals of model analysis instrument 10 based on receiving, the software of installing according to its inside, analysis meter is calculated on tested mechanical structured member 50 three acceleration transducers 40 translational degree of freedom frequency response function H of corresponding position under the power excitation separately
yF(translational degree of freedom frequency response function H
yFfor the matrix group with frequency dependence, the matrix of corresponding 3 row 3 row under each frequency), then by the translational degree of freedom frequency response function H calculated
yFresult sends computing machine 30 to, by computing machine 30 according to the mensuration software of installing in it, the translational degree of freedom frequency response function H based on receiving
yFdata, by the rotational degree of freedom frequency response function formula 1 of deriving according to method of finite difference as follows)-3) calculate respectively three acceleration transducers 40 translational degree of freedom frequency response function H of corresponding position under Moment Excitation separately
yM, the rotational degree of freedom frequency response function H under power excitation
θ F, the rotational degree of freedom frequency response function H under Moment Excitation
θ M(three is relevant with rotational degree of freedom, is referred to as the rotational degree of freedom frequency response function), thus the mensuration of the rotational degree of freedom frequency response function of mechanical structured member 50 completed, and rotational degree of freedom frequency response function curve map is shown.
H
θF＝TH
yF 2）
Wherein T is transition matrix,
S is the distance between adjacent two acceleration transducer 40 centers.
For example: when Fig. 4 a shows certain mensuration, the translational degree of freedom frequency response function H of 40 corresponding positions of acceleration transducer under the power excitation in the middle of being positioned on the tested mechanical structured member 50 that LMS vibration and model analysis instrument 10 calculate
yFcurve map.Fig. 4 b show based on Fig. 4 a, obtain for 40 corresponding positions of acceleration transducer in the middle of being positioned on tested mechanical structured member 50, the translational degree of freedom frequency response function H under Moment Excitation
yMcurve map.Fig. 4 c show based on Fig. 4 a, obtain for 40 corresponding positions of acceleration transducer in the middle of being positioned on tested mechanical structured member 50, the rotational degree of freedom frequency response function H under the power excitation
θ Fcurve map.Fig. 4 d show based on Fig. 4 a, obtain for 40 corresponding positions of acceleration transducer in the middle of being positioned on tested mechanical structured member 50, the rotational degree of freedom frequency response function H under Moment Excitation
θ Mcurve map.
The utility model has the advantages that:
1, the vibration of the LMS in the utility model is all the common instrument and equipment in vibration-testing field with model analysis instrument, acceleration transducer, exciting force hammer, be easy to obtain, thereby, with Laser doppler seanning or rotational response sensor, to compare, cost of the present utility model is low.
2, the utility model operation implementation process is simple, and without loaded down with trivial details debugging, the rotational degree of freedom frequency response function of tested mechanical structured member can directly be calculated and be drawn out by computing machine.
3, the translational degree of freedom frequency response function of the utility model based under the power excitation determines the rotational degree of freedom frequency response function, has science, and the precision of the rotational degree of freedom frequency response function determined is high, can meet the accuracy requirement of this area.
The above is preferred embodiment of the present utility model and the know-why used thereof; for a person skilled in the art; in the situation that do not deviate from spirit and scope of the present utility model; the apparent changes such as any equivalent transformation based on the technical solutions of the utility model basis, simple replacement, within all belonging to the utility model protection domain.
Claims (6)
1. a mechanical structured member rotational degree of freedom frequency response function is measured system, it is characterized in that: it comprises LMS vibration and model analysis instrument, exciting force hammer, computing machine and three acceleration transducers, wherein:
The signal transmission port of the signal transmission port of three these acceleration transducers, this exciting force hammer is connected with the corresponding signal input/output port of model analysis instrument with this LMS vibration respectively, and this LMS vibration is connected with the PORT COM of this computing machine with the PORT COM of model analysis instrument.
2. mechanical structured member rotational degree of freedom frequency response function as claimed in claim 1 is measured system, it is characterized in that:
Three described acceleration transducers are arranged on flexible attachment, this flexible attachment comprises carves graduated flat board, offer the through hole of strip on this flat board, run through in this through hole and be provided with three positioning unit parts, on each this positioning unit part, a described acceleration transducer is installed, wherein: this positioning unit part comprises collet, described acceleration transducer is fixed at the top of this collet, the bottom of this collet is connected with an end of the sliding axle that runs through this through hole setting, the other end and the set nut of this sliding axle are spirally connected, this collet and this set nut lay respectively at this dull and stereotyped both sides.
3. mechanical structured member rotational degree of freedom frequency response function as claimed in claim 2 is measured system, it is characterized in that:
Described flexible attachment is that plastic material is made.
4. as claim 1 or 2 or 3 described mechanical structured member rotational degree of freedom frequency response functions mensuration systems, it is characterized in that:
Described acceleration transducer is piezoelectric acceleration transducer.
5. mechanical structured member rotational degree of freedom frequency response function as claimed in claim 4 is measured system, it is characterized in that:
Described piezoelectric acceleration transducer is PCB333B type piezoelectric acceleration transducer.
6. as claim 1 or 2 or 3 described mechanical structured member rotational degree of freedom frequency response functions mensuration systems, it is characterized in that:
Described exciting force hammer is for having the exciting force hammer of CL-YD-315 type piezoelectric type Quartz Force Sensor.
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| CN2013204191390U CN203337254U (en) | 2013-07-15 | 2013-07-15 | Measurement system for corner freedom degree frequency-response function of mechanical structural member |
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| CN2013204191390U CN203337254U (en) | 2013-07-15 | 2013-07-15 | Measurement system for corner freedom degree frequency-response function of mechanical structural member |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900827A (en) * | 2014-04-02 | 2014-07-02 | 武汉东测科技有限责任公司 | Electric-drive simulation oil pressure brake device |
| CN106568563A (en) * | 2016-11-01 | 2017-04-19 | 西安交通大学 | Quantitatively-excited main shaft natural frequency multipoint testing system |
| CN108151870A (en) * | 2017-11-30 | 2018-06-12 | 武昌船舶重工集团有限公司 | A kind of construction quality problem detection method based on frequency response function |
-
2013
- 2013-07-15 CN CN2013204191390U patent/CN203337254U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900827A (en) * | 2014-04-02 | 2014-07-02 | 武汉东测科技有限责任公司 | Electric-drive simulation oil pressure brake device |
| CN106568563A (en) * | 2016-11-01 | 2017-04-19 | 西安交通大学 | Quantitatively-excited main shaft natural frequency multipoint testing system |
| CN106568563B (en) * | 2016-11-01 | 2018-10-19 | 西安交通大学 | A kind of main shaft intrinsic frequency multi-point test system quantifying excitation |
| CN108151870A (en) * | 2017-11-30 | 2018-06-12 | 武昌船舶重工集团有限公司 | A kind of construction quality problem detection method based on frequency response function |
| CN108151870B (en) * | 2017-11-30 | 2020-07-28 | 武昌船舶重工集团有限公司 | Construction quality problem detection method based on frequency response function |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100191 B3, Haidian District, Beijing, Huayuan Road Patentee after: Beijing Electric Processing Research Institute Co.,Ltd. Address before: 100191 B3, Haidian District, Beijing, Huayuan Road Patentee before: BEIJING INSTITUTE OF ELECTRO-MACHINING |
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| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131211 |
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| CX01 | Expiry of patent term |