One-way wind tunnel force transducer
By designing a unidirectional wind tunnel force sensor and adopting a vertical elastomer and strain gauge structure, the problems of large size, low precision and high cost of existing sensors are solved, and the application of high-precision and low-cost wind tunnel force sensors is realized.
Patent Information
- Application Number
- CN202423177202.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-12-23
AI Technical Summary
The three-dimensional force sensors, four-dimensional force sensors, five-dimensional force sensors and other sensors used in existing wind tunnel tests are large in size, low in precision, high in cost, and complex to calibrate in experimental situations that do not require multi-directional torque measurement.
A unidirectional wind tunnel force sensor is designed. It uses a vertical rectangular elastic body with a strain gauge and an electronic circuit board inside. The strain gauge is used to measure the resistance or pressure in the horizontal direction. It has a simple structure, is easy to install and calibrate, and has low cost.
A high-precision, low-cost unidirectional wind tunnel force sensor is realized, which is suitable for wind tunnel experiments, has good stability and long life, and avoids mechanical wear.
Smart Images
Figure CN223485454U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sensors, and in particular to a unidirectional wind tunnel force sensor. Background Technology
[0002] A wind tunnel is a pipe that generates artificial airflow to study the aerodynamic effects of objects in the airflow and to conduct heat and pressure resistance tests. Currently, the main methods for measuring force and torque in wind tunnel testing are three-dimensional force sensors, four-dimensional force sensors, five-dimensional force sensors, and six-dimensional force sensors. These sensors can sense forces and torques in multiple directions simultaneously, but they have disadvantages such as large size, crosstalk between data from multiple directions, low overall accuracy, complicated calibration, and very high cost.
[0003] At the same time, wind tunnel testing also faces some less complex experimental situations. Therefore, not all experiments require understanding the forces and torques acting on multiple directions simultaneously. In such cases, the original measurement methods are not appropriate.
[0004] Based on this practical application scenario, we designed a unidirectional wind tunnel force sensor to measure the resistance or pressure in the horizontal direction. Utility Model Content
[0005] The purpose of this invention is to provide a unidirectional wind tunnel force sensor, which has the advantages of high accuracy, convenient installation and calibration, and extremely low cost.
[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:
[0007] A unidirectional wind tunnel force sensor includes an elastic body, which is a vertical cuboid. A square through-hole is provided at the upper front end of the elastic body, extending from the front to the rear. Two strain gauges are fixedly installed on the left and right inner walls of the square through-hole.
[0008] A circular placement groove is provided at the lower front end of the elastic body, and the placement groove is connected to a square through hole. A circular through hole is provided on the right side of the elastic body, which is connected to the placement groove.
[0009] An electronic circuit board is installed in the placement slot. The electronic circuit board is electrically connected to two strain gauges. A cable is installed in the circular perforation. The cable is electrically connected to the electronic circuit board.
[0010] The preferred solution is as follows:
[0011] Preferably, the top of the elastomer has a first threaded hole.
[0012] Preferably, the bottom of the elastomer has two second threaded holes.
[0013] In summary, this utility model combines the advantages of a single-point force sensor structure, offering good stability, long service life, low cost, and no mechanical wear. It is suitable for wind tunnel experimental environments, providing options for wind tunnel experimental occasions and tools. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structural design of the embodiment;
[0015] Figure 2 This is a bottom side view of the overall structural design of the embodiment.
[0016] In the diagram, 1 is an elastomer; 2 is a strain gauge; 3 is an electronic circuit board; and 4 is a cable. Detailed Implementation
[0017] The present invention will be further described in detail below with reference to the accompanying drawings.
[0018] Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings.
[0019] like Figure 1 , Figure 2 As shown, a unidirectional wind tunnel force sensor includes an elastic body 1, which is a vertical cuboid. A square through hole is provided at the upper front end of the elastic body 1, which extends from the front to the rear, thus generating strain beams on the left and right sides. The two strain beams are parallel to ensure that the force sensing in the horizontal direction is more uniform. Two strain gauges 2 are fixedly installed on the left and right inner walls of the square through hole.
[0020] The material of the elastomer 1 is aluminum alloy. In addition to the two sides to which the strain gauge 2 is attached, both sides are subjected to oxidation protection treatment, which can ensure that the sensor has better accuracy, longer life and more stable performance.
[0021] Both strain gauges 2 are conversion elements, which are fixed to the elastomer 1 by high temperature curing. The zero-cut strain gauges 2 form a Wheatstone bridge.
[0022] A circular placement groove is provided at the lower front end of the elastomer 1, and the placement groove is connected to a square through hole. A circular through hole is provided on the right side of the elastomer 1, which is connected to the placement groove.
[0023] An electronic circuit board 3 is installed in the placement slot. The electronic circuit board 3 is electrically connected to two strain gauges 2. A cable 4 is installed in the circular perforation. The cable 4 is electrically connected to the electronic circuit board 3.
[0024] The top of the elastomer 1 has a first threaded hole, and the bottom of the elastomer 1 has two second threaded holes. The first threaded hole is used to fix the test model, and the two second threaded holes are used to fix the elastomer 1 in the wind tunnel. The high flatness and levelness of the elastomer 1 can also ensure that the horizontal wind resistance is the same during the test. Finally, the wind resistance change law of the test model is obtained by measuring the force value change by the strain gauge 2.
[0025] Specific implementation process:
[0026] The test model is fixed to the top of the elastomer 1 by screws and the first threaded hole. The elastomer 1 is fixed in the wind tunnel by two bolts and two second threaded holes. The left and right sides of the elastomer 1 are placed horizontally in the direction of the wind in the wind tunnel. The high flatness and horizontality of the elastomer 1 can also ensure that the horizontal wind resistance is the same during the test. Finally, the wind resistance change law of the test model is obtained by measuring the force value change by strain gauge 2.
[0027] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.
Claims
1. A unidirectional wind tunnel force sensor, characterized in that: Includes an elastic body (1), which is a vertical cuboid. The upper front part of the elastic body (1) has a square through hole that extends from the front part to the rear part. Two strain gauges (2) are fixedly installed on the left and right inner walls of the square through hole. The lower front part of the elastic body (1) is provided with a circular placement groove, which is connected to a square through hole. The right side of the elastic body (1) is provided with a circular through hole that is connected to the placement groove. An electronic circuit board (3) is provided in the placement slot. The electronic circuit board (3) is electrically connected to two strain gauges (2). A cable (4) is provided in the circular perforation. The cable (4) is electrically connected to the electronic circuit board (3).
2. The unidirectional wind tunnel force sensor according to claim 1, characterized in that: The top of the elastomer has a first threaded hole.
3. The unidirectional wind tunnel force sensor according to claim 1, characterized in that: The bottom of the elastomer has two second threaded holes.