JPH1019702A - Device for measuring thrust of jet engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for measuring thrust of a jet engine that can measure the horizontal component as well as vertical component of thrust. SOLUTION: This device is provided with a fixing base 1, a floating table 2 which is arranged upward on the base 1 and in which a jet engine 10 to be measured is fixed to its upper side, load cells 7,... which are provided between the base 1 and table 2 and measure the thrust components in the vertical direction of the engine 10 according to the relative variation of the table 2, and a load cell 15 for measuring the thrust components in the horizontal direction along the axial-line direction of the engine 10. The table 2 is lifted and supported by a link mechanism 4 whose both ends are connected to the base 1 with pins and which is provided with a load cell.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust measuring device for measuring a thrust of a jet engine.

[0002]

2. Description of the Related Art Conventionally, in order to test the performance of a jet engine on the ground and to examine its performance, the following thrust measuring device has been used. That is, the jet engine is installed on the upper part of the carriage with wheels at the bottom, and the jet engine is driven. At this time, the thrust of the jet engine is reduced by the load cell provided between the carriage and the fixed base below the carriage. It has a structure to measure.

[0003]

By the way, in recent years, a jet engine with a thrust deflection nozzle that can change the injection angle freely, such as obliquely upward or backward or obliquely downward without limiting the thrust to the rear in the axial direction, has emerged. However, such a jet engine also requires a measuring device capable of measuring thrust. However, the conventional measuring device has a drawback that only the thrust component in the horizontal direction along the axis of the jet engine can be measured, and the deflection performance of the nozzle cannot be accurately evaluated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a jet engine thrust measurement device capable of measuring not only a horizontal thrust component but also a vertical thrust component. The point is to provide.

[0005]

To achieve the above object, according to the first aspect of the present invention, there is provided a fixed base installed on a floor, and disposed above the fixed base and measured above the fixed base. A floating table to which a jet engine is fixed, and a vertical pressure sensor interposed between the fixed base and the floating table to measure a vertical thrust component of the jet engine based on a relative displacement of the floating table And a horizontal pressure sensor that is interposed between the fixed base and the floating platform and measures a horizontal thrust component along the axial direction of the jet engine based on the relative displacement of the floating platform. Features.

According to a second aspect of the present invention, the vertical pressure sensor and the horizontal pressure sensor are each constituted by a load cell.

According to the third aspect of the present invention, the floating platform is
Both ends of the front and rear are suspended and supported by a link mechanism in which the upper and lower ends are pin-connected to the fixed base and a load cell for measuring a vertical thrust component of the jet engine is interposed.

According to a fourth aspect of the present invention, a left-right regulating mechanism for regulating relative movement of the floating platform in the left-right direction is interposed between the fixed base and the floating platform. I do.

According to a fifth aspect of the present invention, the vertical pressure sensor and the horizontal pressure sensor are provided with a calibration actuator and a reference load cell, respectively, in parallel thereto.

According to the present invention, the jet engine is driven after being fixed to the floating platform. Accordingly, the floating platform tends to move relative to the fixed base in the horizontal and vertical directions due to the thrust of the jet engine. The vertical thrust component and the horizontal thrust component of the jet engine are measured independently by the vertical pressure sensor and the horizontal pressure sensor based on the relative displacement of the floating platform at this time. . As a result, the deflection characteristics of the propulsion nozzle can be appropriately evaluated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a thrust measuring apparatus for a jet engine according to the present invention will be described with reference to the drawings.

FIG. 1 is a side view of a thrust measuring device for a jet engine, and FIG. 2 is a plan view of the same. In FIG. 1, reference numeral 1 denotes a fixed base fixedly installed on a floor surface, and 2 denotes a floating table arranged above the fixed base 1. A jet engine 10 to be measured is fixed to this upper portion by a known fixing means 3. Reference numeral 4 denotes a link mechanism interposed between the fixed base 1 and the floating platform 2 for suspending and supporting the floating platform 2. The link mechanism 4 is provided at each of the four corners of the floating table 2 formed in a rectangular shape.

More specifically, the link mechanism 4 includes the fixed base 1.
(Here, the left side in FIG. 1 is the front,
Brackets 5 are provided so as to project outward in the front-rear direction, respectively, on the left and right upright portions 1a,.
The load cell 7 is supported between upper and lower ends by pins 8a and 8b extending in the left-right direction between brackets 6 provided to protrude inward in the front-rear direction. That is, the floating base 2 is suspended and supported by the fixed base 1 via the link mechanism 4 so as to be movable in the front-rear direction. The load cell 7 constitutes a vertical pressure sensor for measuring a vertical thrust component of the jet engine 10.

A cylinder 11 and a reference load cell 12 are interposed between the fixed base 1 and the floating platform 2 at the front and rear ends and in the center in the left-right direction, respectively (see FIG. 4). The load cells 7 constituting the vertical pressure sensor are calibrated. Here, the front end cylinder 1
1 is provided above the reference load cell 12, and the rear end cylinder 11 is provided below the reference load cell 12.

A horizontal pressure sensor is provided between the fixed base 1 and the floating platform 2 for measuring a horizontal thrust component of the jet engine based on a relative displacement of the floating platform 2 in the front-rear direction. A load cell 15 is provided.
The load cell 15 is provided with an upright portion 1b at the center in the left-right direction of the rear end portion of the fixed base 1, while a hanging portion 2b is provided at a substantially central portion of the floating platform 2, and these upstanding portions 1b and hanging portions 2b are provided. It is interposed between brackets. A reference load cell 17 and a cylinder 18 are interposed between the hanging portion 2b and an upright portion 1c provided slightly forward of a center portion of the fixed base 1, whereby the horizontal pressure is reduced. The load cell 15 constituting the sensor is calibrated.

In FIG. 3, reference numeral 20 is interposed between the fixed base 1 and the floating base 2 so that the floating base 2 is mounted on the fixed base 1.
This is a left-right restricting mechanism that restricts relative movement in the left-right direction with respect to. The left-right direction regulating mechanism 20 is interposed between the upright portion 1a provided on the fixed base 1 and the bracket 21 provided on the lower surface of the floating table 2, and is, for example, a turnbuckle. A device utilizing such a screw mechanism is used.

Next, the operation of the thrust measuring device for a jet engine having the above configuration will be described. First, the jet engine 10 is fixed on the floating platform 2 by the fixing means 3.
Next, the cylinder 11 is operated to activate the reference load cell 12.
Are calibrated based on the readings of the load cells 7,... Constituting the vertical pressure sensor. Similarly, the load cell 15 constituting the horizontal pressure sensor is calibrated based on the reading of the reference load cell 17 by operating the cylinder 18.

Next, the jet engine 10 fixed on the floating table 2 is operated. Due to the thrust of the jet engine 10, the floating platform 2 tends to move forward and upward or downward in the horizontal direction with respect to the fixed base 1. Based on the relative displacement of the floating table 2 with respect to the fixed base 1 at this time,
The load cell 7, which is a vertical pressure sensor, and the load cell 15 which is a horizontal pressure sensor,
A zero thrust component in the vertical direction and a thrust component in the horizontal direction along the axial direction of the jet engine are independently measured. At this time, the thrust component in the vertical direction is obtained by the total sum of the floating table 2 and the four load cells 7 provided at the four corners of the fixed base 1. As a result, the jet engine 1
The deflection characteristics of the zero propulsion nozzle can be appropriately evaluated.

In the above-described embodiment, the vertical thrust component and the horizontal thrust component of the jet engine 10 are respectively measured using the load cells 7, 15,..., But the present invention is not limited to this. The other thrust components may be measured by other pressure sensors.

[0020]

As described above, according to the present invention, when a jet engine fixed on a floating platform is driven, the vertical pressure sensor and the horizontal pressure sensor use the relative displacement of the floating platform with respect to the fixed base. Therefore, the vertical thrust component of the jet engine and the horizontal thrust component along the axial direction of the jet engine can be measured independently, and as a result, the deflection characteristics of the propulsion nozzle can be properly evaluated. it can.

If a calibration actuator and a reference load cell are provided in parallel with the vertical pressure sensor and the horizontal pressure sensor, the zero point adjustment of these sensors can be performed, and highly accurate measurement can be performed.

[Brief description of the drawings]

FIG. 1 is a side view of a jet engine thrust measuring device according to the present invention.

FIG. 2 is a plan view of the thrust measuring device.

FIG. 3 is a front view of the thrust measurement device.

FIG. 4 is a sectional view taken along line XX of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed base 2 Floating stand 4 Link mechanism 7 Load cell 10 Jet engine 11 Cylinder 12 Reference load cell 15 Load cell 17 Reference load cell 18 cylinder

Claims (5)

[Claims] 1. A fixed base installed on a floor, a floating table arranged above the fixed base and to which a jet engine to be measured is fixed above the fixed base, between the fixed base and the floating base. A vertical pressure sensor for measuring a vertical thrust component of the jet engine based on the relative displacement of the floating table, and a relative position of the floating table interposed between a fixed base and the floating table. A jet engine thrust measurement device, comprising: a horizontal pressure sensor for measuring a horizontal thrust component along the axial direction of the jet engine based on displacement. 2. The jet engine thrust measurement device according to claim 1, wherein each of the vertical pressure sensor and the horizontal pressure sensor is constituted by a load cell. 3. The jet engine thrust measuring device according to claim 2, wherein the floating table is provided with a load cell having upper and lower ends connected to the fixed base with pins and measuring a vertical thrust component of the jet engine. A thrust measuring device for a jet engine, wherein both end portions at the front and rear are suspended and supported by a linked mechanism. 4. The jet engine thrust measuring device according to claim 2, wherein a left-right direction regulating mechanism for restricting relative movement of the floating table in the left-right direction is provided between the fixed base and the floating table. A thrust measurement device for a jet engine, which is interposed. 5. The jet engine thrust measuring device according to claim 2, wherein a calibration actuator and a reference load cell are respectively provided in parallel with the vertical pressure sensor and the horizontal pressure sensor. A thrust measurement device for a jet engine, characterized in that: