Mechanically independent decoupled thrust torque measurement device and method of use

Abstract

The application provides a mechanical independent decoupling thrust torque measuring device and a use method, and belongs to the technical field of propeller measuring tests. The application aims at solving the problems of the existing propeller performance measurement, such as the incomplete independence of thrust and torque, the lack of effective decoupling methods and devices, and the difficulty in miniaturization. In the application, a transmission shaft, a thrust torque sensor, a blade shaft and a locking screw are coaxially connected in sequence, and a torque element and a thrust element are arranged in parallel on the thrust torque sensor; the torque element is connected with the blade shaft through a disturbance elimination sheet, and the thrust element is connected with the blade shaft through an elongated rod; a motor is coaxially connected with the transmission shaft, and a propeller is installed on the blade shaft; the motor is fixed on a support, and a thrust torque sensor assembly is fixed on the support through a bearing assembly; a fixed end of a slip ring is installed on a first bearing seat, and an output end is connected with the transmission shaft. The application solves the problems of the existing propeller performance measurement, such as the incomplete independence of thrust and torque, the lack of effective decoupling methods and devices, and the difficulty in miniaturization.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of propeller measurement test, and particularly relates to a mechanical independent decoupling thrust torque measurement device and a use method. BACKGROUND

[0002] A propeller is a device that converts the rotary power of an engine into lift or propulsive force by rotating blades in the air or water. At different speeds, the propeller produces different thrust and torque, in order to obtain the dynamic performance of the propeller, its power curve needs to be provided and its performance needs to be tested. The main measurement parameters of the propeller include thrust and torque, in order to improve the accuracy of measurement, the mutual coupling between the thrust and the torque should be reduced as much as possible, and the complete independence in the mechanical structure should be realized.

[0003] The first commonly used method is to use two finished thrust and torque sensors, which are installed on a fixed support to directly measure the thrust and torque of the propeller. The disadvantages are: first, the range of the finished sensor may not be suitable for the tested propeller; second, the size of the sensor may not meet the space requirements of the measuring table; third, the sensor is assembled through bearings and couplings, which may affect the measurement accuracy; fourth, the thrust and torque sensors are independent, and the calibration coefficients of the sensors are the coefficients when the load is applied alone, the sensors are not decoupled when the thrust and torque exist simultaneously during the test, which affects the measurement accuracy.

[0004] The second method used is to use a high-strength metal whole design thrust torque two-component sensor according to the thrust and torque range of the tested propeller. This sensor usually has mutual interference between components. The main component coefficients and mutual interference coefficients of each component are calibrated to realize theoretical decoupling. This method can improve the accuracy to a certain extent, but the calibration and calibration process is static, and the decoupling accuracy is affected by the matching degree of each component load, the selection of decoupling formula influence factors and the stiffness of the sensor, and it is often impossible to completely decouple. Propeller test is a dynamic process, and there are many factors affecting the measurement accuracy, so the measurement accuracy may be affected by the decoupling method.

[0005] Chinese patent CN201720397233.9 discloses a multi-rotor unmanned aerial vehicle rotor test system, which is the first measurement method, uses tension sensors and torque sensors to realize measurement, and two sensors are independently calibrated without decoupling.

[0006] Chinese patent CN202111302643.8 discloses a test bench for measuring the aerodynamic performance of a variable-pitch propeller, which adopts the second method and designs a thrust and torque measuring device according to the propeller range. The device can measure the thrust and torque characteristics of the propeller, and the horizontal beam is used to measure the propeller thrust, and the vertical beam is used to measure the reaction torque of the motor to obtain the propeller torque. The thrust and torque are not completely independent, and the decoupling method is not given. The thrust and torque accuracy is easily affected by the bearing and coupling, and it is difficult to realize miniaturization design in the spatial structure.

[0007] Chinese patent CN201510054466.4 discloses a thrust and torque measuring device for a pod test, which is used to measure the hydrodynamic performance of a ship pod propeller. The measuring bench adopts the second method and designs a thrust and torque measuring sensor according to the propeller range. The thrust and torque elements are arranged in front and back, and the layout is reasonable and compact, but there is a large interference between them, and the decoupling method is not given in the patent.

[0008] In summary, it is urgent to design a mechanical independent decoupling thrust and torque measuring device and its use method to solve the problems of existing propeller performance measurement, such as the inability of thrust and torque to be completely independent, the lack of effective decoupling method, and the difficulty of device miniaturization. It breaks through the limitations of existing thrust and torque measuring devices, and makes them more reliable, environmentally adaptable and practical. SUMMARY

[0009] In the following, a brief summary of the present application is given in order to provide a basic understanding of some aspects of the present application. It should be understood that this summary is not an exhaustive overview of the present application. It is not intended to identify key or important parts of the present application nor is it intended to limit the scope of the present application. Its purpose is merely to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.

[0010] In view of this, in order to solve the problems of existing propeller performance measurement, such as the inability of thrust and torque to be completely independent, the lack of effective decoupling method, and the difficulty of device miniaturization, the present application provides a mechanical independent decoupling thrust and torque measuring device and its use method.

[0011] Scheme one: a mechanical independent decoupling thrust and torque measuring device, comprising a motor, a coupling, a slip ring, a bearing assembly, a thrust and torque sensor assembly, a propeller and a bracket.

[0012] The thrust torque sensor assembly comprises a thrust torque sensor, a transmission shaft, a torque element, a thrust element, a disturbance elimination sheet, a paddle shaft, a key groove, a locking screw and an elongated rod; the transmission shaft, the thrust torque sensor, the paddle shaft and the locking screw are coaxially connected in sequence, the key groove is arranged on the paddle shaft, and the torque element and the thrust element are arranged in parallel on the thrust torque sensor; the torque element is connected with the paddle shaft through the disturbance elimination sheet, and the thrust element is connected with the paddle shaft through the elongated rod;

[0013] The motor is coaxially connected with the transmission shaft through a shaft coupling, and the propeller is installed on the paddle shaft.

[0014] The motor is fixed on the support through a motor flange, and the thrust torque sensor assembly is fixed on the support through a bearing assembly.

[0015] The bearing assembly comprises a first bearing seat, a first bearing, a shaft shoulder, a second bearing and a second bearing seat; the first bearing seat and the second bearing seat are fixedly installed on the support and connected through the shaft shoulder; the first bearing seat and the second bearing seat are respectively provided with the first bearing and the second bearing; the first bearing and the second bearing are sleeved on the outside of the transmission shaft to play a fixing and supporting role.

[0016] The fixed end of the slip ring is installed on the first bearing seat, and the output end is connected with the transmission shaft.

[0017] Further, the torque element is in the form of a four-column beam, and the thrust element is in the form of a double "I" beam.

[0018] Further, 4 pieces of torque strain sheets are arranged on each beam of the torque element, and 16 pieces of torque strain sheets form a first Wheatstone bridge.

[0019] Two pieces of thrust strain sheets are arranged on the upper and lower ends of the thrust element respectively, and 4 pieces of thrust strain sheets form a second Wheatstone bridge.

[0020] Further, the installation position of the propeller on the paddle shaft is determined by the cooperation of the flat key and the key groove, and the propeller is fixed by a locking nut.

[0021] Further, the slip ring is communicatively connected with the acquisition device.

[0022] Further, the power of the motor is 4Kw, the rated speed is 2000 revolutions per minute, and the rated torque is 20Nm.

[0023] Further, the design load of the thrust torque sensor is 400N of normal force and 20Nm of torque; the output sensitivity of the thrust element is 1mV / V, and the output sensitivity of the torque element is 1mV / V.

[0024] Further, the number of the disturbance elimination sheets is 16, and the thickness is 0.8mm; the cross-sectional dimension of the elongated rod is 3mmx3mm.

[0025] Scheme two, a method for using a mechanical independent decoupling thrust torque measuring device, specifically comprising the following steps:

[0026] S1. Before the test, the KF of the thrust element and the KMx of the torque element in the thrust torque sensor assembly need to be calibrated;

[0027] Wherein KF is the proportional coefficient between the thrust and the output voltage of the thrust element, and KMx is the proportional coefficient between the torque and the output voltage of the torque element;

[0028] S2. During the test, the output voltage of the first Wheatstone bridge and the second Wheatstone bridge is multiplied by the coefficient of the torque element and the thrust element respectively to obtain the torque and thrust of the propeller;

[0029] When the propeller rotates, the thrust torque sensor assembly signal is transmitted to the acquisition device through the wired slip ring.

[0030] The present application has the following beneficial effects relative to the prior art:

[0031] 1. The present application realizes accurate decomposition measurement of thrust and torque through the parallel and collaborative design of the thrust element and the torque element, and can accurately obtain the propeller performance curve, providing a reliable basis for propeller selection and aircraft and ship design;

[0032] 2. In the present application, the propeller is directly connected with the thrust torque sensor, reducing intermediate transmission links, so that the measurement result directly reflects the real performance of the propeller;

[0033] 3. In the present application, the input shaft is supported by two bearings, which is convenient for installation and can provide stable support when the thrust torque balance rotates, ensuring the stability and reliability of the measurement result;

[0034] 4. The thrust torque sensor of the present application has compact structure and independent elements, good adaptability, and can be widely applied to various propeller testing fields such as aircraft propeller testing, wind tunnel testing, ship water tunnel testing, etc., and has high reliability and environmental adaptability, wide market application prospect and significant social benefits. BRIEF DESCRIPTION OF DRAWINGS

[0035] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0036] Figure 1 It is a position relationship diagram of a mechanical independent decoupling thrust torque measuring device;

[0037] Figure 2 It is a structural schematic diagram of a thrust torque sensor assembly;

[0038] Figure 3 is a sectional view of Figure 2 ;

[0039] Figure 4 is a sectional view of Figure 3 B-B.

[0040] In the figure: 1-motor, 2-motor flange, 3-coupling, 4-slip ring, 5-first bearing seat, 6-first bearing, 7-shaft shoulder, 8-second bearing, 9-second bearing seat, 10-thrust torque sensor, 11-locking nut, 12-propeller, 13-flats, 14-bracket, 101-transmission shaft, 102-torque element, 103-thrust element, 104-anti-interference piece, 105-blade shaft, 106-keyway, 107-locking screw, 108-elongated rod, 109-torque strain gauge, 110-thrust strain gauge. DETAILED DESCRIPTION

[0041] In order to make the technical solutions and advantages of the embodiments of the present application clearer, the following further describes the exemplary embodiments of the present application in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0042] Embodiment 1, refer to Figures 1-4 This embodiment is a mechanical independent decoupling thrust torque measuring device, which comprises a motor 1, a coupling 3, a slip ring 4, a bearing assembly, a thrust torque sensor assembly, a propeller 12 and a bracket 14.

[0043] The thrust torque sensor assembly comprises a thrust torque sensor 10, a transmission shaft 101, a torque element 102, a thrust element 103, an anti-interference piece 104, a blade shaft 105, a keyway 106, a locking screw 107 and an elongated rod 108. The transmission shaft 101, the thrust torque sensor 10, the blade shaft 105 and the locking screw 107 are coaxially connected in sequence, the blade shaft 105 is provided with the keyway 106, and the thrust torque sensor 10 is provided with the torque element 102 and the thrust element 103 in parallel. The torque element 102 is connected to the blade shaft 105 through the anti-interference piece 104, and the thrust element 103 is connected to the blade shaft 105 through the elongated rod 108.

[0044] The motor 1 is coaxially connected to the transmission shaft 101 through the coupling 3, and the propeller 12 is installed on the blade shaft 105.

[0045] The motor 1 is fixed on the bracket 14 through the motor flange 2, and the thrust torque sensor assembly is fixed on the bracket 14 through the bearing assembly.

[0046] The bearing assembly comprises a first bearing seat 5, a first bearing 6, a shaft shoulder 7, a second bearing 8 and a second bearing seat 9, the first bearing seat 5 and the second bearing seat 9 are fixedly installed on the support 14 and connected through the shaft shoulder 7, the first bearing 6 and the second bearing 8 are respectively arranged in the first bearing seat 5 and the second bearing seat 9, and the first bearing 6 and the second bearing 8 are sleeved outside the transmission shaft 101 to play a fixing and supporting role;

[0047] The fixed end of the slip ring 4 is installed on the first bearing seat 5, and the output end is connected with the transmission shaft 101.

[0048] Further, the torque element 102 is in the form of a four-column beam, and the thrust element 103 is in the form of a double "I" beam.

[0049] Further, 4 torque strain gauges 109 are arranged on each beam of the torque element 102, and 16 torque strain gauges 109 constitute a first Wheatstone bridge.

[0050] The upper end and the lower end of the thrust element 103 are respectively arranged with 2 thrust strain gauges 110, and 4 thrust strain gauges 110 constitute a second Wheatstone bridge.

[0051] Further, the propeller 12 is determined in the installation position of the blade shaft 105 through the cooperation of the flat key 13 and the key groove 106, and is fixed through the locking nut 11.

[0052] Further, the slip ring 4 is in communication connection with the acquisition device.

[0053] Further, the power of the motor 1 is 4Kw, the rated rotating speed is 2000 revolutions per minute, and the rated torque is 20Nm.

[0054] Further, the design load of the thrust torque sensor 10 is a normal force of 400N and a torque of 20Nm; the output sensitivity of the thrust element 103 is 1mV / V, and the output sensitivity of the torque element 102 is 1mV / V.

[0055] Further, the number of the disturbance elimination sheets 104 is 16, and the thickness is 0.8mm; the cross-sectional dimension of the slender rod 108 is 3mmx3mm.

[0056] Embodiment 2, for reference Figures 1-4 The present embodiment is used to explain a method for using a mechanical independent decoupling thrust torque measuring device, which specifically comprises the following steps:

[0057] S1. Before the test, the KF of the thrust element 103 and the KMx of the torque element 102 in the thrust torque sensor assembly need to be calibrated;

[0058] Wherein KF is the proportional coefficient between the thrust and the output voltage of the thrust element 103, KMx is the proportional coefficient between the torque and the output voltage of the torque element 102;

[0059] S2. The output voltage of the first Wheatstone bridge and the output voltage of the second Wheatstone bridge are multiplied by the coefficient of the torque element 102 and the thrust element 103 respectively to obtain the torque and the thrust of the propeller 12;

[0060] When the propeller 12 rotates, the thrust torque sensor assembly signal is transmitted to the acquisition device through the wired slip ring 4.

[0061] Through the parallel cooperative design of the thrust element and the torque element in the application, the accurate decomposition measurement of the thrust and the torque is realized, the propeller performance curve can be accurately obtained, and reliable basis can be provided for propeller selection and aircraft and ship design; meanwhile, the propeller is directly connected with the thrust torque sensor, the intermediate transmission link is reduced, and the measurement result directly reflects the real performance of the propeller.

[0062] Through the compact structure of the thrust torque sensor in the application and the independence of each element, the adaptability is good, and the application can be widely applied to various propeller test fields such as aircraft propeller test, wind tunnel test, ship water tunnel test, has high reliability and environmental adaptability, has broad market application prospect and significant social benefits; meanwhile, the input shaft is supported by two bearings, which is convenient for installation and can provide stable support when the thrust torque balance rotates, and guarantees the stability and reliability of the measurement result.

[0063] Although the application is described according to a limited number of embodiments, those skilled in the art, with the benefit of the above description, will appreciate that other embodiments can be conceived within the scope of the application described herein. In addition, it should be noted that the language used in the specification is mainly selected for readability and instructional purposes and is not selected for the purpose of interpreting or limiting the subject matter of the application. Therefore, many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the application is illustrative rather than restrictive, and the scope of the application is defined by the appended claims.

Claims

1. A method of using a mechanical, independent decoupling thrust torque measuring device, characterized in that, The measuring device comprises a motor (1), a shaft coupling (3), a slip ring (4), a bearing assembly, a thrust torque sensor assembly, a propeller (12) and a bracket (14); The thrust torque sensor assembly comprises a thrust torque sensor (10), a transmission shaft (101), a torque element (102), a thrust element (103), a disturbance elimination sheet (104), a blade shaft (105), a key groove (106), a locking screw (107) and an elongated rod (108); the transmission shaft (101), the thrust torque sensor (10), the blade shaft (105) and the locking screw (107) are coaxially connected in sequence, the key groove (106) is arranged on the blade shaft (105), and the torque element (102) and the thrust element (103) are arranged in parallel on the thrust torque sensor (10); the torque element (102) is connected with the blade shaft (105) through the disturbance elimination sheet (104), and the thrust element (103) is connected with the blade shaft (105) through the elongated rod (108); The motor (1) is coaxially connected with the transmission shaft (101) through the shaft coupling (3), and the propeller (12) is installed on the blade shaft (105); The motor (1) is fixed on the bracket (14) through a motor flange (2), and the thrust torque sensor assembly is fixed on the bracket (14) through the bearing assembly; The bearing assembly comprises a first bearing seat (5), a first bearing (6), an axle shoulder (7), a second bearing (8) and a second bearing seat (9); the first bearing seat (5) and the second bearing seat (9) are fixedly installed on the bracket (14) and connected through the axle shoulder (7), the first bearing (6) and the second bearing (8) are arranged in the first bearing seat (5) and the second bearing seat (9) respectively, and the first bearing (6) and the second bearing (8) are sleeved outside the transmission shaft (101) to play a fixing and supporting role; The fixed end of the slip ring (4) is installed on the first bearing seat (5), and the output end is connected with the transmission shaft (101); The torque element (102) is in the form of a four-column beam, and the thrust element (103) is in the form of a double "I" beam; Four torque strain sheets (109) are arranged on each beam of the torque element (102), and 16 torque strain sheets (109) form a first Wheatstone bridge; Two thrust strain sheets (110) are arranged at the upper end and the lower end of the thrust element (103) respectively, and four thrust strain sheets (110) form a second Wheatstone bridge; The use method specifically comprises the following steps: S1. Before the test, the KF of the thrust element (103) and the KMx of the torque element (102) in the thrust torque sensor assembly need to be calibrated; Wherein KF is the proportional coefficient between the thrust and the output voltage of the thrust element (103), and KMx is the proportional coefficient between the torque and the output voltage of the torque element (102); S2. During the test, the output voltages of the first Wheatstone bridge and the second Wheatstone bridge are multiplied by the coefficients of the torque element (102) and the thrust element (103) respectively to obtain the torque and the thrust of the propeller (12). When the propeller (12) rotates, the thrust torque sensor assembly signal is transmitted to the acquisition device through the wired slip ring (4).

2. The method of using a mechanical decoupler for thrust and torque measurements of claim 1, wherein, The propeller (12) is determined on the installation position on the blade shaft (105) through the cooperation of the flat key (13) and the keyway (106), and is fixed through the locking nut (11).

3. The method of using a mechanical decoupler for thrust and torque measurements of claim 1, wherein, The slip ring (4) is in communication connection with the acquisition device.

4. The method of using a mechanical decoupler for thrust and torque measurements of claim 1, wherein, The power of the motor (1) is 4Kw, the rated speed is 2000r / min, and the rated torque is 20Nm.

5. The method of using a mechanical decoupler for thrust and torque measurements of claim 1, wherein, The design load of the thrust torque sensor (10) is 400N of normal force and 20Nm of torque; the output sensitivity of the thrust element (103) is 1mV / V, and the output sensitivity of the torque element (102) is 1mV / V.

6. The method of using a mechanical decoupler for thrust and torque measurements of claim 1, wherein, The number of the anti-interference sheets (104) is 16, and the thickness is 0.8mm; the cross-sectional size of the slender rod (108) is 3mm*3mm.

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