Fixing device for Rayleigh disc acoustic standing wave field measurement experiment and measurement method thereof
By designing a fixing device including a bottle mouth-shaped base, a knob-shaped cover, an aperture rod and a clamping device, the problem of Rayleigh disk suspension method destroying the airtightness of the resonant tube wall in the prior art is solved, and high-precision acoustic standing wave field measurement is achieved, which has the characteristics of high stability, easy operation and high accuracy.
Patent Information
- Application Number
- CN202411737271.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-02-25
AI Technical Summary
In the prior art, the Rayleigh disk suspension method destroys the airtightness of the resonant tube wall, affects the acoustic standing wave field distribution and thin line torque measurement, making it difficult to achieve accurate acoustic standing wave field measurement.
A fixing device including a bottle mouth-shaped base, a knob-shaped cover, an aperture rod and a clamping device is designed. The Rayleigh disk is suspended in the acoustic standing wave field of the resonant tube, and the deflection angle of the Rayleigh disk is adjusted through the knob-shaped cover to ensure the accurate transmission of data.
High-precision acoustic standing wave field measurement is achieved, avoiding the problems of airtightness damage and difficult operation in traditional methods, and is characterized by high stability, easy operation and high accuracy.
Smart Images
Figure CN119509672A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of acoustic standing wave field measurement, in particular to a fixing device for acoustic standing wave field measurement experiment based on Rayleigh disk and a measuring method thereof. Background Art
[0002] Acoustic standing waves are a sound interference phenomenon with rich connotations and wide applications. They are formed by the superposition of two coherent waves with the same amplitude and frequency when propagating in opposite directions on the same straight line. The nodes of the standing waves (the positions of the anti-wave nodes) are stationary, the waveform does not propagate, and it has good stability. The Rayleigh disk principle was proposed by Lord Rayleigh, a famous British physicist in the 19th century. Its principle is to measure the sound intensity by measuring the deflection of a disk suspended in the sound field. It has been used to calibrate standard microphones and hydrophones. The traditional fixing method is to punch holes in the pipe wall or fix it directly on the pipe wall. The former will destroy the sealing structure of the resonance cavity and affect the experimental phenomenon; the latter needs to be operated through the pipe mouth, which is extremely difficult, and the relevant parameters of the Rayleigh disk cannot be changed.
[0003] The existing Rayleigh disk suspension method has the following defects: the installation method destroys the airtightness of the resonance tube wall, affects the distribution of the acoustic standing wave field, affects the measurement of the fine wire torque, etc. Therefore, the experimental results are closely related to the precise deflection data of the Rayleigh disk. If you want to complete the precise measurement of the acoustic standing wave field, you need to ensure that the Rayleigh disk deflection accurately conveys the information of the acoustic field, so a Rayleigh disk fixing device is urgently needed. Summary of the invention
[0004] The purpose of the present invention is to provide a Rayleigh disk experimental fixture for measuring sound standing wave field and its measurement method in view of the deficiencies of the prior art. The fixture is composed of a bottle mouth-shaped base, a knob-shaped cover, a rod with holes and a clamping device. The copper metal sheet (Rayleigh disk) is bonded to one end of a very thin suspension wire and fixed, and is suspended in the sound standing wave field of a resonance tube. A mobile phone is fixed on a guide rail parallel to the resonance tube, and the Rayleigh disk position is photographed to collect data information such as the deflection angle of the Rayleigh disk. The Rayleigh disk experimental fixture for measuring sound standing wave field has the advantages of experimental accuracy and simple operation, and better overcomes the defects of traditional installation methods such as damage to the airtightness of the resonance tube wall, influence on the distribution of the sound standing wave field, and influence on the measurement of the torque of the thin wire. It can be applied to the measurement of sound velocity, sound intensity, etc. in physical experiments, and has the characteristics of high stability, easy operation and adjustment, and high accuracy.
[0005] The specific technical scheme for achieving the purpose of the present invention is: a fixing device for Rayleigh disk measurement of acoustic standing wave field experiment, characterized in that the fixing device includes: a bottle mouth-shaped base, a knob-shaped cover, a rod with holes, a clamping device, a fastening bolt and a limit bolt, the bottle mouth-shaped base is a cylinder surrounded by the bottle mouth wall, and a cylindrical protrusion with an "I"-shaped through hole is provided below it; a circular through hole and an angle 0 point mark are provided in the center of the "I"-shaped through hole coaxially arranged with the bottle mouth-shaped base; the knob-shaped cover is a cylinder provided with a rod hole, a bottle cap groove and a clamping plate, and an angle scale and a threaded hole perpendicular to the bottle cap groove are provided on its outer side; the clamping plate is provided A rectangular plate on the knob-shaped cover is provided with a semicircular A through hole on its central axis; A screw holes are symmetrically provided on both sides of the semicircular A through hole; the rod hole is arranged at the center of the knob-shaped cover and is coaxial with the semicircular A through hole of the clamping plate; the clamping device is a rectangular plate provided with a B screw hole and a semicircular B through hole; B screw holes are symmetrically provided on both sides of the semicircular B through hole; the upper end of the perforated rod is inserted into the rod hole and is flush with the height of the clamping plate arranged on the knob-shaped cover, and the perforated rod is clamped and fixed by fastening bolts through the A screw hole and the B screw hole; the limit bolt passes through the threaded hole to limit the relative rotation between the bottle mouth-shaped base and the knob-shaped cover.
[0006] The cylindrical protrusion under the bottle mouth-shaped base is used to be positioned and fixed above the resonance tube through the hole to ensure good air tightness at the interface; the cylindrical bottom is provided with an "I"-shaped through hole, and a circular through hole is provided in the center.
[0007] The knob-shaped cover is provided with a circular groove, whose inner and outer diameters are the same as those of the cylindrical structure in the bottle-mouth-shaped base, and the depth of the circular groove is the same as the height of the cylindrical structure. A circular through hole is opened in the center, and the radius is consistent with the circular through hole in the center of the bottle-mouth-shaped base.
[0008] The perforated rod is a uniform cylinder, the radius of which is consistent with the central circular through hole of the knob-shaped cover and the bottle-mouth-shaped base, and a through hole perpendicular to the axial direction of the perforated rod is opened at the bottom.
[0009] The invention discloses a measuring method of a fixing device for a Rayleigh disk to measure an acoustic standing wave field experiment. The method is characterized in that the fixing device uses a thin wire to suspend the Rayleigh disk under a rod with a hole when performing an acoustic standing wave field experiment. Then the Rayleigh disk is located at the center of a resonance tube, a mobile phone is fixed on a guide rail parallel to the resonance tube, and the Rayleigh disk position is photographed to collect data information of the Rayleigh disk deflection angle.
[0010] During the experiment, the thin wire is adjusted by moving the clamping height of the perforated rod on the knob-shaped cover, and the normal of the Rayleigh disk is perpendicular to the axial direction of the resonance tube as the angle 0 point. The angle scale on the knob-shaped cover is adjusted to the size of the angle between the normal of the Rayleigh disk and the axial direction of the resonance tube through relative rotation of the cylindrical bottle cap groove on the knob-shaped cover and the outer wall of the bottle mouth wall of the bottle mouth-shaped base, so as to ensure accurate data when collecting the deflection angle of the Rayleigh disk.
[0011] The interface between the cylindrical protrusion and the circular resonance tube is sealed by hot melt adhesive or a sealing gasket.
[0012] Compared with the prior art, the present invention has the following beneficial technical effects and significant technical progress: 1) High precision: The sound field measurement result of the Rayleigh disk suspended by the knob fixture differs from the standard value by less than 3%; 2) Good airtightness: The fixture places the Rayleigh disk in the tube by drilling holes on the tube, so that parameters such as the initial angle can be adjusted outside the tube. At the same time, the knob-shaped cover fits with the bottle-shaped base to ensure good airtightness of the tube.
[0013] 3) Easy and controllable operation: The initial angle and position of the Rayleigh disk in the tube can be adjusted by rotating the bottle cap-shaped knob on the bottle mouth-shaped base. At the same time, the Rayleigh disk can be easily taken in and out through the "I"-shaped hole on the bottle mouth-shaped base, realizing the exploration of variable parameters of the Rayleigh disk acoustic standing wave field measurement. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the structure of the fixing device of the present invention; Figure 2 It is a schematic diagram of the installation of the fixing device of the present invention; Figure 3 It is a schematic diagram of the bottle mouth shaped base structure; Figure 4 for Figure 3 Lower side view; Figure 5 It is a schematic diagram of the knob-shaped cover structure; Figure 6 for Figure 5 Side view; Figure 7 It is a schematic diagram of a specific application of the present invention. DETAILED DESCRIPTION
[0015] See also Figure 1-2The fixing device for Rayleigh disk experiment of measuring acoustic standing wave field of the present invention comprises: a bottle mouth-shaped base 1, a knob-shaped cover 2, a rod with holes 3, a clamping device 4 and a limit bolt 6, wherein the bottle mouth-shaped base 1 is a cylinder surrounded by a bottle mouth wall 103, and a cylindrical protrusion 101 with a "I"-shaped through hole 102 is provided below the bottle mouth-shaped base 1; a circular through hole 105 and an angle 0 point mark 104 are provided in the center of the "I"-shaped through hole 102, which are coaxial with the bottle mouth-shaped base 1; the knob-shaped cover 2 is a cylinder provided with a rod hole 201, a bottle cover groove 202 and a clamp 203, and an angle scale 206 and a threaded hole 205 which are perpendicular to the bottle cover groove 202 are provided on the outer side thereof; the clamping plate 20 is a rectangular plate provided on the knob-shaped cover 2, and its central axis A semicircular A through hole 207 is provided on it; A screw holes 204 are symmetrically provided on both sides of the semicircular A through hole 207; the rod hole 201 is arranged at the center of the knob-shaped cover 2, and is coaxial with the semicircular A through hole 207 of the clamping plate 203; the clamping device 4 is a rectangular plate provided with a B screw hole 401 and a semicircular B through hole 402; B screw holes 401 are symmetrically provided on both sides of the semicircular B through hole 402; the upper end of the perforated rod 3 is inserted into the rod hole 201, and is flush with the clamping plate 203 arranged on the knob-shaped cover 2, and the perforated rod 3 is clamped and fixed by the fastening bolts 5 through the A screw hole 204 and the B screw hole 401; the limiting bolt 6 passes through the threaded hole 205 to control the relative rotation between the bottle mouth base 1 and the knob-shaped cover 2.
[0016] See also Figure 3-4 The bottle mouth-shaped base 1 is a cylinder surrounded by a bottle mouth wall 103, and a cylindrical protrusion 101 with an "I"-shaped through hole 102 is provided thereunder; a circular through hole 105 is provided in the center of the "I"-shaped through hole 102 and is coaxial with the bottle mouth-shaped base 1; the outer diameter of the cylindrical protrusion 101 is smaller than the inner diameter of the bottle mouth wall 103, and the ratio of the outer diameter to the height is 2:1; the inner diameter of the bottle mouth wall 103 is longer than the "I"-shaped hole 102, and the ratio of the inner diameter to the height is 2:1; the "I"-shaped through hole 102 is a rectangular hole, and its length-to-width ratio is 10-20:1; the angle 0 point mark 104 is arranged parallel to the "I"-shaped through hole 102.
[0017] See also Figure 5-6 The knob-shaped cover 2 is a cylinder provided with a rod-through hole 201, a bottle cap groove 202, a clamping plate 203 and an angle scale 206, and a threaded hole 205 is provided on the outer side of the cylinder and is perpendicular to the bottle cap groove 202; the clamping plate 203 is a vertical plate provided with a semicircular A through hole 207 and an A screw hole 204; the rod-through hole 201 is arranged at the center of the knob-shaped cover 2, and is coaxial with the semicircular A through hole 207 of the clamping plate 203; the A screw hole 204 is symmetrically arranged on both sides of the semicircular A through hole 207; the angle scale 206 is a scale of 0 to 90° arranged on the outer wall of the knob-shaped cover 2, and its graduation value is 3°.
[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. Example
[0019] See also Figure 7 A fixing device for Rayleigh disk experiment of measuring acoustic standing wave field comprises a bottle mouth base 1, a knob-shaped cover 2, a rod with holes 3 and a clamping device 4. The upper end of the bottle mouth base 1 is provided with a cylindrical bottle mouth wall 103 and a "I"-shaped through hole 102 in a groove. The bottle mouth base 1 is fixed to the perforated position of the tube cavity of the circular resonance tube 9 through a cylindrical protrusion 101. Hot melt adhesive or a sealing gasket is used to ensure good air tightness at the interface between the truncated cone-shaped protrusion at the upper end of the cylindrical protrusion 101 and the circular resonance tube 9. The end of the rod with holes 3 without holes passes upward through the rod hole 201 on the knob-shaped cover 2 and is flush with the clamping plate 203. Using the clamping device 4, the two through holes 401 correspond to the screw holes 204 of the clamping plate 203 on the knob-shaped cover 2, and are fixed with fastening bolts 5 to fix the upper end of the rod with holes 3 on the knob-shaped cover 2. After the high molecular polyethylene fiber suspension line 7 is bonded to the circular through hole 301 at one end of the perforated rod 3, a metal thin disc with a diameter of 0.5 cm and a thickness of 0.1 mm, namely, the Rayleigh disc 8, is bonded thereto. The Rayleigh disc 8 is placed into the resonance tube 9 through the "I"-shaped hole 102 of the bottle mouth-shaped base 1, and the cylindrical bottle cover groove 202 on the knob-shaped cover 2 is matched with the bottle mouth wall 103 on the bottle mouth-shaped base 1, reducing the air leakage of the "I"-shaped hole 102, thereby ensuring good air tightness in the resonance tube 9.
[0020] During the experiment, the Rayleigh disk 8 is required to be located at the center of the resonance tube 9, and the fine wire can be further adjusted by moving the perforated rod 3 to clamp the height on the knob-shaped cover 2. During the experiment, the normal direction of the Rayleigh disk 8 is required to be perpendicular to the axial direction of the resonance tube 9 at the angle 0 point. The cylindrical bottle cap groove 202 on the knob-shaped cover 2 and the outer wall of the bottle mouth wall 103 on the bottle mouth base 1 are rotated relative to each other, and the angle scale 206 on the knob-shaped cover 2 is adjusted to adjust the angle between the normal direction of the Rayleigh disk 8 and the axial direction of the resonance tube 9 to ensure accurate data when collecting the Rayleigh disk deflection angle.
[0021] The above is only a further explanation of the present invention and is not intended to limit the patent of the present invention. Any equivalent implementation of the present invention should be included in the scope of the claims of the patent of the present invention.
Claims
1. A fixture for Rayleigh disk measurement of acoustic standing wave field experiment, characterized in that: The fixing device comprises: a bottle mouth-shaped base, a knob-shaped cover, a rod with holes, a clamping device and a limiting bolt. The bottle mouth-shaped base is a cylinder surrounded by the bottle mouth wall, and a cylindrical protrusion with a "I"-shaped through hole is arranged below the bottle mouth-shaped base; a circular through hole and an angle 0 point mark are arranged coaxially with the bottle mouth-shaped base at the center of the "I"-shaped through hole; the knob-shaped cover is a cylinder with a rod hole, a bottle cap groove and a clamping plate, and an angle scale and a threaded hole arranged perpendicular to the bottle cap groove are arranged on the outer side of the clamping plate; the clamping plate is a rectangular plate arranged on the knob-shaped cover, and a semicircular through hole is arranged on the central axis. A-shaped through hole; A screw holes are symmetrically arranged on both sides of the semicircular A through hole; the rod hole is arranged at the center of the knob-shaped cover and is coaxial with the semicircular A through hole of the clamping plate; the clamping device is a rectangular plate with a B screw hole and a semicircular B through hole; B screw holes are symmetrically arranged on both sides of the semicircular B through hole; the upper end of the perforated rod is inserted into the rod hole and is flush with the height of the clamping plate arranged on the knob-shaped cover, and the perforated rod is clamped and fixed by the fastening bolts through the A screw hole and the B screw hole; the limit bolt limits the relative rotation between the bottle mouth base and the knob-shaped cover through the threaded hole.
2. The fixture for Rayleigh disk measurement of acoustic standing wave field experiment according to claim 1, characterized in that: The outer diameter of the cylindrical protrusion is smaller than the inner diameter of the bottle mouth wall, and the ratio of the outer diameter to the height is 2:
1.
3. The fixture for Rayleigh disk measurement of acoustic standing wave field experiment according to claim 1, characterized in that: The inner diameter of the bottle mouth wall is greater than the length of the "I"-shaped hole, and the ratio of the inner diameter to the height is 2:1; the "I"-shaped through hole is a rectangular hole, and its length-to-width ratio is 10-20:
1.
4. The fixture for Rayleigh disk measurement of acoustic standing wave field experiment according to claim 1, characterized in that: The angle 0 point engraved line is arranged in parallel with the "I"-shaped through hole.
5. The fixture for Rayleigh disk measurement of acoustic standing wave field experiment according to claim 1, characterized in that: One end of the perforated rod is provided with a through hole which is vertically arranged with the perforated rod. The diameter of the perforated rod is smaller than the diameter of the through hole of the rod, and the diameter of the through hole of the rod is greater than 0.3 mm.
6. The fixture for Rayleigh disk measurement of acoustic standing wave field experiment according to claim 1, characterized in that: The angle scale is a scale of 0 to 90° arranged on the outer wall of the knob-shaped cover, and its graduation value is 3°.
7. A method for measuring a fixture for a Rayleigh disk for measuring an acoustic standing wave field experiment according to claim 1, characterized in that: When conducting an acoustic standing wave field experiment, the fixing device uses a polyethylene fiber line to suspend the Rayleigh disk under a perforated rod, and places the Rayleigh disk at the center of the resonance tube. A mobile phone fixed on a guide rail parallel to the resonance tube is used to take pictures and collect data information on the deflection angle of the Rayleigh disk.
8. The measuring method of the fixture for Rayleigh disk measurement of acoustic standing wave field experiment according to claim 7, characterized in that: During the experiment, the polyethylene fiber line is adjusted by moving the clamping height of the perforated rod on the knob-shaped cover, and the angle 0 point is when the normal of the Rayleigh disk is perpendicular to the axial direction of the resonance tube. The cylindrical bottle cap groove on the knob-shaped cover and the outer wall of the bottle mouth of the bottle mouth-shaped base are rotated relative to each other, and the angle scale on the knob-shaped cover is used to adjust the angle between the normal of the Rayleigh disk and the axial direction of the resonance tube, so that the mobile phone can accurately collect data information on the deflection angle of the Rayleigh disk.
9. The measuring method of the fixture for Rayleigh disk measurement of acoustic standing wave field experiment according to claim 7, characterized in that: The interface between the cylindrical protrusion and the circular resonance tube is sealed by hot melt adhesive or a sealing gasket.