CN1010125B - Vibration-type dynameter - Google Patents
Vibration-type dynameterInfo
- Publication number
- CN1010125B CN1010125B CN 85103184 CN85103184A CN1010125B CN 1010125 B CN1010125 B CN 1010125B CN 85103184 CN85103184 CN 85103184 CN 85103184 A CN85103184 A CN 85103184A CN 1010125 B CN1010125 B CN 1010125B
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- China
- Prior art keywords
- vibration
- string
- musical instrument
- line
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The present invention relates to a vibration type dynamometer. A vibration chord line of the present invention is made of platinum base nickel alloy. The dynamometer obtains the magnitude of manufactured force applied on the vibration chord line by measuring the natural vibration frequency of the vibration chord line as a traditional vibration type dynamometer. However, in the dynamometer of the vibration chord line, which is made of platinum-nickel alloy by the present invention, the vibration type dynamometer can carry out precise force measurement or weighing for the first time. Measuring accuracy can reach 10<plus5> by the present invention.
Description
The present invention relates to a kind of vibration-type dynameter.More particularly relate to a kind of by measuring at the natural vibration frequency of this string of a musical instrument of the direction reinforcing of the stretching string of a musical instrument dynamometer with dynamometry.
As everyone knows, the string of a musical instrument of the tensioning that two ends are fixing, its natural vibration frequency depends on the density of the pulling force and the line thereof of this string of a musical instrument.By making the string of a musical instrument be subjected to the pulling force relevant and producing vibration, just can utilize this phenomenon to check and dynamometry with a certain unknown force to be determined.The natural vibration frequency of the string of a musical instrument is directly proportional with the square root of pulling force, and this pulling force is directly proportional with power to be determined again.So just can exert oneself is square numerical value that is directly proportional of one and vibration frequency.
Once disclosed a kind of dynamometer in " frequency analysis measuring technique " literary composition that people such as Bouts in 1977 are being shown, it is to come dynamometry by the natural vibration frequency of measuring vibrations line, and the string of a musical instrument can be that platinum-nickel alloy is made.
Vibration-type dynameter according to above-mentioned principle design is made, and has obtained using widely.Yet this traditional class dynamometry promptly can not be in order to carry out precision measurement to power or weight in respect of a very big shortcoming, and this is because after having applied power or weight to be measured on the string of a musical instrument, and use for a long time could be accurately with its real natural frequency vibration.
In general, vibration frequency needs 3-30 minute to the accurate response of power or weight, and this will decide according to the fixing means at the material of manufacturing vibration string line and string of a musical instrument two ends.This response has slowly caused a series of undesirable consequences, such as: creep, the zero point drift of hysteresis phenomenon and numerical value to be measured etc.Therefore, the accuracy of traditional various vibration-type dynameters remains on this lower numerical value of 1/5000-1/20000.
One of purpose of the present invention provides a kind of creep of having eliminated substantially, the high precision vibration-type dynameter of the zero point drift of the hysteresis phenomenon and the numerical value of surveying.
Two of purpose of the present invention is to form a kind of high precision vibration-type dynameter that can be anticorrosive and extremely durable.
In order to reach these purposes, vibration string line used in the present invention is to make with platinum base nickel-containing alloys.The string of a musical instrument is strained between a fixing basic point and a moving point, and the direction at this some place along the stretching string of a musical instrument applies power to be measured.Length direction and its direction of vibration at the string of a musical instrument added a fixed magnetic field orthogonally simultaneously.According to the Fu Laiming right-hand law, the vibration of this string of a musical instrument makes and produces a vibration voltage on the string of a musical instrument.Therefore, this vibration voltage is input in the positive feedback amplifier, this amplifier and the string of a musical instrument are formed an oscillatory circuit, make the string of a musical instrument to be proportional to the subduplicate frequency sustained vibration of tension force, and this tension force is that the power of this string of a musical instrument of stretching produces on this string of a musical instrument.The string of a musical instrument plays the resonator effect in oscillatory circuit.Just the numerical value that can exert oneself by the oscillation frequency of measuring this circuit.
With reference to each accompanying drawing, details of the present invention is further described.
Fig. 1 is a schematic diagram of the present invention;
Fig. 2 is the physical construction of a kind of embodiment of the present invention;
Fig. 3 is the sectional view of the string of a musical instrument stationary installation used in the embodiment shown in Figure 2;
Fig. 4 is the plan view of above-mentioned string of a musical instrument stationary installation;
Fig. 5 is the part decomposition diagram of above-mentioned string of a musical instrument stationary installation;
Fig. 6 is a curve map of explaining the foregoing description function;
Fig. 7 to Figure 11 is the various modification of the vibration string line that can use in the above-described embodiments.
Referring to Fig. 1, this figure has illustrated the principle of vibration-type dynameter.Vibration string line 1 adds tensioning between the force 3 a fixed pedestal 2 and one, this power F is added on the direction of the stretching string of a musical instrument 1, the string of a musical instrument made from conductor 1 is subjected to vertically being added to the effect of the fixed magnetic field on this string of a musical instrument, and the rectangle frame of representing with double dot dash line among the figure 4 demonstrates the reach in magnetic field.The vibration of the string of a musical instrument in this magnetic field makes on this string of a musical instrument and produces vibration voltage.This voltage is input in the positive feedback amplifier 5, and amplifier 5 and vibration string line 1 are formed an oscillatory circuit.Like this, vibration string line 1 has played resonator in pierce circuit.Thereby, the string of a musical instrument 1 continuous shaking on the natural frequency that is directly proportional with tensile force f.Output signal frequency by measuring amplifier 5 just can be measured vibration frequency.By with square value that is directly proportional of measured frequency, can obtain the size of power F.
According to above-mentioned principle, consult Fig. 2,3,4 and 5 one embodiment of the present of invention are described below.Fig. 2 is the physical construction of this embodiment, and the carriage 12 of supporting weighing pan 11 keeps it vertical by two parallel arms 14 and 15, and arm 14 and 15 end form elastomeric joint 14a, 14b, 15a and 15b, and are stretched out by the pedestal inboard.Carriage 12 is formed the Roberval mechanical hook-ups with two parallel arms 14 that have elastomeric joint 14a, 14b, 15a and 15b and 15.The weight that acts on the weighing pan 11 is passed on the lever 16 by a connecting rod 13 that has elastomeric joint, elastic support 17 is supporting lever 16, between the horizontal projection 18b of an end 16b of lever 16 and this plant bottom case 18, use string of a musical instrument stationary installation 3a and 2a, with vibration string line 1 tensioning, in Fig. 3, Fig. 4 and Fig. 5, will be illustrated about after the details.Therefore, one and act on the power that the weight on the weighing pan 11 is directly proportional and make vibration string line 1 produce pulling force.In addition, vibration string line 1 is the strip shape in the present embodiment, this band shape vibration string line 1 with its length direction vertical with thickness on be subjected to the effect of a fixed magnetic field.A rectangular area 4 of representing with double dot dash line demonstrates the reach of the fixed magnetic field that applies.A vibration string line 1 and a positive feedback amplifier (not drawing in this figure) are formed one and are similar at the oscillatory circuit shown in Fig. 1.The natural vibration frequency vibration of the string of a musical instrument 1 of the power that this circuit is directly proportional with a weight that is added with and acts on the weighing pan 11.In this figure, omit wiring from the string of a musical instrument 1 to this amplifier, pass the hole 16a of bolt 19 from frame bar 16, be screwed on the base 18, this is a kind of fastener, for example use during this equipment, tight a bolt 19 in transportation, when lever 16 touches the protruding 18a of base 18 till, like this, lever 16 just has been locked.
Fig. 3, Fig. 4 and Fig. 5 have represented the sectional view of stationary installation respectively, and plan view and part decomposition diagram are made diagram to the detail section of string of a musical instrument stationary installation 3a and 2a.Fig. 3 is the A-A sectional view among Fig. 4.In Fig. 3 (and Fig. 4), banded vibration string line 1 be clipped in two securing members 21 and 21 ' among, and fill up on the two sides of the string of a musical instrument 1 two mica splitting thin slices 22 and 22 '.Mica sheet 22 and 22 ' be used for other metallic element and 1 electric insulation of the string of a musical instrument with this equipment.Sheet spring 24 is being contained on the chassis 25 that a center of securing member 21 and 21 ' vertically shift onto in the case type shell 23 has a through hole 25a, and by with the contacted spring cup that projection 26a and 26b be housed of securing member 21 26 it flatly being fixed.Projection 23a on the inwall of shell 23 and 23b prop up securing member 21 '.With screw 27 and 27 ' tension spring lid 26 is fixed on the shell 23, sheet spring 24 and shell 23 respectively carry through hole 24a and 23c, are used to pass the end of the string of a musical instrument 1.String of a musical instrument stationary installation 3a of Zu Chenging and 2a are installed in respectively on the lower plane of the outshot 18b of (Fig. 2) and base 18 on the last plane of tail end 16b of lever 16 (Fig. 2) like this.The assembling situation that in the part decomposition diagram of Fig. 5, has shown each part in the shell 23.
In the structure of embodiment recited above, banded vibration string line 1 is to be made by the alloy of the nickel of 92.5% platinum and 7.5%.
And vibration string line identical with structure is that the performance of traditional vibration-type dynameter of being made by stainless steel is contrasted to Fig. 6 to this dynamometer of the vibration string line that platinum alloy is housed makes.Fig. 6 be string of a musical instrument vibration frequency to acting on the response curve of the variation of power on this string of a musical instrument, the ordinate of this figure is represented oscillation frequency, the abscissa express time.On time base, t
1Moment when expression removes original value and is applied to power on the vibration string line and increases, and t
2Represent the moment when this power returns to original value.This figure clearly illustrates that, the vibration frequency of this dynamometer (solid line) with afterburning variation change rapidly, and the vibration frequency of traditional dynamometer (dotted line) will just can settle out after long-time, illustrates that vibration frequency creep and hysteresis phenomenon will occur with increase of putting forth effort and minimizing.In order to demonstrate the difference of different its creeps of material that vibration string line uses quantitatively, in will being listed in the table below by the creep compliance of the definite various string of a musical instrument materials of △ f/fW, wherein, fW is the final frequency increment that obtains, and △ f is the difference (referring to Fig. 6) between fW and the frequency increment that moment obtained after power increases.Certainly these results are to be foundation with the test that all materials carry out under the same conditions.
(seeing literary composition back table)
As above shown in the table, compare with the creep compliance of traditional dynameter of the various vibration string lines that use non-platinum-nickel alloy material to make, the creep compliance of dynamometer of the present invention is very little.Using nickel content is this alloy of 5-15%, has obtained fabulous effect equally.
The above-mentioned embodiment of the invention can become: the device that uses two vibration string lines; Perhaps a kind of end of the string of a musical instrument than remainder manufacture thick; Perhaps make a kind of tuning-fork type vibrating device, these will be illustrated referring to Fig. 7 to Figure 11 below.Certainly, these vibration string lines are all made with platinum-nickel alloy.
In Fig. 7, two parallel string of a musical instrument 1a and 1b are tensioned at a common fixed pedestal 2 and shared adding between the force 3.These two string of a musical instrument 1a and 1b vibrate with opposite phases each other.Vibrate by phases opposite.Act on two horizontal forces adding on the force 3 owing to the vibration of the string of a musical instrument is cancelled out each other.Like this, just can eliminate the error that produces owing to the horizontal vibration that adds force 3 substantially.
Fig. 8 has shown another kind of pair of string of a musical instrument device.In this device, two string of a musical instrument 1c and 1d series connection, two fixed pedestals 2 and 2 ' between be tensioned, between two strings of a musical instrument, be equipped with and add force 3, in this pair string of a musical instrument device, string of a musical instrument 1c has added a power so that the pulling force of this string of a musical instrument is increased, and this power is added to this string of a musical instrument pulling force is reduced.Therefore, two string of a musical instrument 1c and 1d are with they different separately frequency vibrations.The difference of measuring two oscillation frequency can improve the resolution of this equipment.Two string of a musical instrument devices of forming as shown in Figure 9 have above-mentioned functions equally.
The end of vibration string line shown in Figure 10 (1e) than the remainder of string of a musical instrument direction of vibration do thick, and with fixed pedestal 20 with add force 30 formation one.The string of a musical instrument of this structure is convenient to be fixedly mounted on this equipment, but shortcoming is the production cost height.
Figure 11 has shown a kind of two string of a musical instrument devices as the tuning fork shape.This device is applicable to precision measurement and powerful the measurement.People understand easily from above-mentioned explanation, and the present invention vibrates the dynamometry first Application to the precise force-measuring meter with the string of a musical instrument.Consider above-mentioned achievement.The invention enables a kind of accuracy is provided is 10
-5Vibration-type dynameter become possibility.
In addition, manufacture vibration string line with platinum alloy and make this equipment have fabulous stability and long-life, and the platinum alloy that contains 5-15% nickel shows greater than 100kg/mm
2High-tensile, therefore, can use wideer vibration frequency range.Twice when in other words, the highest frequency that can select of full load is zero load.Degree of accuracy and resolution are improved.Under the situation of using traditional vibration-type dynameter, the 1.2-1.3 of frequency doubly when highest frequency only was zero load.
Table
String of a musical instrument material creep (△ f/fw)
Dynamometer platinum 92.5%, nickel 7.5% alloy 2.7 * 10
-6
Stainless steel 36 * 10
-6
Compare beryllium-aldary 25 * 10
-6
The nickel metal (Ni-SPAN-C) 10 * 10 that adds carbon
-6
Claims (1)
1, a kind of vibration-type dynameter, it by measuring the vibration string line of making by platinum base nickel-containing alloys natural vibration frequency and by one with the testing force vibration so that the device of vibration string line tensioning comes ergometry, it is characterized in that:
One first string of a musical instrument stationary installation is used for an end of the string of a musical instrument is fixed on a teat on the dynamometer pedestal;
One second string of a musical instrument stationary installation, be used for the other end of the string of a musical instrument is fixed on the end that a power is transmitted bar, this bar is delivered to testing force on the vibration string line, make it have the tension force that is proportional to testing force, first and second stationary installations constitute the clamping element in a pair of casing of packing into, and a spring handle clamping element is vertically shifted onto on the basal disc, this basal disc has a center pit, the string of a musical instrument stretches out in the hole thus, and a spring cup is housed on the casing, and clamping element is fixed on the cabinet wall;
Be added to a magnetic field on the vibration string line, when vibration produces, just on the string of a musical instrument, produce vibration voltage;
A positive feedback amplifier constitutes an oscillatory circuit with vibration string line, and the frequency that it makes this string of a musical instrument determine with the tension force that is applied continues vibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85103184 CN1010125B (en) | 1985-04-26 | 1985-04-26 | Vibration-type dynameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85103184 CN1010125B (en) | 1985-04-26 | 1985-04-26 | Vibration-type dynameter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85103184A CN85103184A (en) | 1986-12-10 |
| CN1010125B true CN1010125B (en) | 1990-10-24 |
Family
ID=4793019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85103184 Expired CN1010125B (en) | 1985-04-26 | 1985-04-26 | Vibration-type dynameter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1010125B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101676730B (en) * | 2008-09-17 | 2011-06-22 | 精工爱普生株式会社 | Vibratory sensor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100549644C (en) * | 2006-12-26 | 2009-10-14 | 河海大学 | Vibrating chord type dynamometer of hollow anchor bar |
-
1985
- 1985-04-26 CN CN 85103184 patent/CN1010125B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101676730B (en) * | 2008-09-17 | 2011-06-22 | 精工爱普生株式会社 | Vibratory sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85103184A (en) | 1986-12-10 |
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