CN103439096B - A kind of helicopter tail rotor booster fatigue test system - Google Patents

Abstract

A helicopter tail rotor booster fatigue test system, which consists of a fatigue testing machine, a hydraulic station, a rotary direct drive valve, an actuator tester, a digital storage oscilloscope, a conversion joint, upper and lower fixtures and a helicopter tail rotor booster ;The upper and lower fixtures are installed on the fatigue testing machine, and the two ends of the helicopter tail rotor booster are installed on the upper and lower fixtures. The hydraulic station is connected to the rotary direct drive valve through the oil pipe, and the rotary direct drive valve is connected to the helicopter tail rotor booster. The actuator tester is connected with the rotary direct drive valve through the circuit, and the digital storage oscilloscope is connected with the actuator tester to display the relevant information of the helicopter tail rotor booster. The invention can not only simulate the effect of external aerodynamic load, but also simulate the effect of hydraulic pressure of the actuator, and the test results have important engineering application value for the fatigue life determination of the helicopter tail rotor booster.

Description

A Fatigue Test System for Helicopter Tail Rotor Booster

technical field

The invention relates to a fatigue test system for a helicopter tail rotor booster, which belongs to the technical field of test and test.

Background technique

During the working process, the helicopter tail rotor booster is constantly subjected to alternating loads, and its fatigue life must be assessed during design and application. Helicopter tail rotor booster usually works under hydraulic drive as a subsystem of the helicopter. It not only bears the hydraulic pressure of its own actuator, but also bears the aerodynamic load. The conventional fatigue testing machine can only simulate the external aerodynamic load, but cannot At present, there is still a lack of effective and practical test system for the fatigue test of the helicopter tail rotor booster to simulate the hydraulic pressure of the actuator. For this reason, the present invention integrates conventional fatigue testing machine, hydraulic station, rotary direct drive valve, actuator tester, digital storage oscilloscope, conversion joint, fixture and helicopter tail rotor booster into helicopter tail rotor booster fatigue test testing system , not only can simulate the external aerodynamic load, but also simulate the hydraulic pressure of the actuator. The test results have important engineering application value for the fatigue life determination of the helicopter tail rotor booster.

Contents of the invention

1. Purpose: The purpose of the present invention is to provide a fatigue test system for helicopter tail rotor booster, which can simulate the load action of the real working state, has the characteristics of simplicity, practicality and high efficiency, and the operating cost of the system is relatively low.

2. Technical solution: A helicopter tail rotor booster fatigue test testing system of the present invention consists of a fatigue testing machine, a hydraulic station, a rotary direct drive valve, an actuator tester, a digital storage oscilloscope, a conversion joint, upper and lower fixtures and Composition of helicopter tail rotor booster. The position connection relationship between them is as follows: the upper and lower fixtures are installed on the fatigue testing machine, the two ends of the helicopter tail rotor booster are installed on the upper and lower fixtures, the hydraulic station is connected to the rotary direct drive valve through the oil pipe, and the rotary direct drive valve is then It is connected with the helicopter tail rotor booster, the actuator tester is connected with the rotary direct drive valve through a circuit, and the digital storage oscilloscope is connected with the actuator tester to display the relevant information of the helicopter tail rotor booster. Among them, the connection sequence of the fatigue testing machine, upper and lower fixtures and helicopter tail rotor booster from top to bottom is:

Fatigue testing machine→upper fixture→helicopter tail rotor booster→lower fixture→fatigue testing machine

The fatigue testing machine is a commonly used low-frequency fatigue testing machine, which is used to apply fatigue load to the piston of the helicopter tail rotor booster, and the load range of the testing machine needs to be greater than the test load of the helicopter tail rotor booster.

The hydraulic station described above is a conventional hydraulic station, which needs to have an oil delivery port and an oil return port. The oil delivery port is used to deliver hydraulic oil to the rotary direct drive valve, and the oil return port is used to return the hydraulic oil to the hydraulic station. The oil pressure provided must be greater than the test oil pressure of the helicopter tail rotor booster and be stable.

The conversion joint is a multi-step shaft part, which is a joint between the two oil ports of the hydraulic station and the oil pipe, and is used to connect the oil pipe and the two oil ports of the hydraulic station.

The rotary direct drive valve is an auxiliary part connected with the helicopter tail rotor booster, and the opening degree of the valve is controlled by a motor inside it. Rotate the direct drive valve to send the hydraulic oil to the tail rotor booster of the helicopter, and drive the piston to move axially. The motor controlling the opening of the valve is driven by the actuator tester to change the direction and speed of the piston movement, forming a closed-loop control, which can Effectively maintain the piston in the helicopter tail rotor booster in a balanced position.

The actuator tester is an electronic device that drives the motor of the rotary direct drive valve, outputs a control signal to the motor of the rotary direct drive valve, and receives the piston position signal fed back by the helicopter tail rotor booster.

The digital storage oscilloscope is a common oscilloscope used to observe the control and feedback signals of the helicopter tail rotor booster.

The helicopter tail rotor booster is a double-chamber single-piston rod hydraulic servo drive device, which consists of a piston rod assembly, a front-end cylinder, a rear-end cylinder, a flange and connecting bolts, and the entire system is connected by connecting bolts and fixed. Under the control of the actuator tester, the tail rotor booster provides the aerodynamic balance force of the tail rotor blades to keep the tail rotor balanced and stable in the working state. The working hydraulic pressure is 6MPa, and the maximum working force of the piston rod is The load is 8kN.

The upper fixture is a combination of a stepped shaft and a hexagon, and its two ends are respectively connected with the fatigue testing machine and the helicopter tail rotor booster.

The lower fixture is a hexagonal piece with a hole in the center, and its two ends are respectively connected with the fatigue testing machine and the helicopter tail rotor booster.

3. Advantages and effects: the beneficial effect of the present invention is that the fatigue test of the helicopter tail rotor booster can be carried out independently, which can provide effective technical support for the design, development and verification of the helicopter tail rotor booster. In addition, the present invention has simple, practical , high efficiency and low cost, it can effectively complete the fatigue test of the helicopter tail rotor booster.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Figure 1 is a schematic diagram of the conversion joint.

Figure 2 is a schematic diagram of the upper fixture.

Figure 3 is a schematic diagram of the connecting rod.

Figure 4 is a schematic diagram of the lower clamp.

Figure 5 is a structural diagram of the tail rotor booster fatigue test system.

In Figure 5: 1. Fatigue testing machine, 2. Upper fixture, 3. Helicopter tail rotor booster, 4. Rotary direct drive valve, 5. Adapter, 6. Hydraulic station, 7. Digital storage oscilloscope, 8. Actuation Device tester, 9. Lower fixture.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Specific Embodiment 1: A specific embodiment of the present invention will be described with reference to FIG. 1 to FIG. 5 .

In Fig. 5, a kind of helicopter tail rotor booster fatigue test test system of the present invention is made up of fatigue tester 1, hydraulic station 6, rotary direct drive valve 4, actuator tester 8, digital storage oscilloscope 7, conversion joint 5 , upper and lower clamps 2, 9 and helicopter tail rotor booster 3 are composed. The position connection relationship between them is as follows: the upper and lower clamps 2 and 9 are installed on the fatigue testing machine 1, the two ends of the helicopter tail rotor booster 3 are installed on the upper and lower clamps 2 and 9, the hydraulic station 6 is connected to the rotating The direct drive valve 4 is connected, the rotary direct drive valve 4 is connected with the helicopter tail rotor booster 3, the actuator tester 8 is connected with the rotary direct drive valve 4 through a circuit, and the digital storage oscilloscope 7 is connected with the actuator tester 8 for display Information about helicopter tail rotor booster 3. In this implementation example, the fatigue testing machine 1 is selected to use MTS to apply a fatigue load to the piston of the helicopter tail rotor booster 3, and the hydraulic station 6 sends the hydraulic oil of the set pressure to the rotary direct drive valve 4, and the rotary direct drive valve 4 Then the hydraulic oil is sent to the helicopter tail rotor booster 3 to drive the piston to move axially; the piston position signal of the helicopter tail rotor booster 3 is fed back to the actuator tester 8 connected with the digital storage oscilloscope 7, and the actuator tester 8. Drive and rotate the motor that directly drives the valve 4 to change the direction of the hydraulic oil in the valve and the opening of the valve to change the direction and speed of the piston movement to form a closed-loop control that can effectively maintain the piston in the helicopter tail rotor booster 3 in balance Location. Since the actuator tester 8 has no screen, it is connected to the digital storage oscilloscope 7, and the current signal of the actuator tester 8 and the valve on-off H channel provide signals to channel 1 of the digital storage oscilloscope 7 to display the rotation Directly drive the opening degree of the valve 4 and the flow direction signal of the hydraulic oil, the demodulation of the actuator tester 8 and the opening and closing loop H channel provide signals to the 2 channel of the digital storage oscilloscope 7 to display the piston displacement of the helicopter tail rotor booster 3 , In this way, the opening degree of the rotary direct drive valve 4 and the flow direction of hydraulic oil and the piston displacement of the helicopter tail rotor booster 3 can be observed by the digital storage oscilloscope 7 . Digital storage oscilloscope 7 can also calculate and display the peak-to-peak value of channel 1 and channel 2. The yellow high-frequency signal is channel 1 signal, and the green low-frequency signal is channel 2 signal. The peak-to-peak value of channel 1 is displayed in the lower left corner of the oscilloscope screen. The actuator tester 8 collects the piston displacement signal from the helicopter tail rotor booster 3, and through calculation, sends instructions to the motor that rotates and directly drives the valve 4, while the digital storage oscilloscope 7 is responsible for displaying the signal. The wires drawn from the actuator tester 8 are divided into two, one of which is connected to the helicopter tail rotor booster 3, and the other is connected to the rotary direct drive valve 4.

There are 4 Ф6.4 fine-fit through holes for M6×40 bolt connection on the 3 cylinder block of the helicopter tail rotor booster, but the joint provided by MTS fatigue testing machine 1 is a threaded joint (M27×2), and the two do not match , in addition, the piston of the helicopter tail rotor booster 3 is hollow and has no joints. For this reason, a clamp (as shown in Figure 2 to Figure 4) is designed and processed, and the helicopter is fixed by the upper and lower clamps (2 and 9). The tail rotor booster 3 is connected to the MTS fatigue testing machine 1 . The hydraulic pipeline connector of the helicopter tail rotor booster 3 is a female connector of M12×1, and the hydraulic station 6 is a threaded hole of M14×1.5×12. Therefore, a pair of hydraulic pipelines and hydraulic station 6 are designed and processed. Adapter joint 5 (as shown in Figure 1).

In this way, the helicopter tail rotor booster fatigue test can be completed through the system designed above.

Specific embodiment two: the difference between this embodiment and specific embodiment one is the selection of fatigue testing machine 1, which can be conventional fatigue testing machines such as MTS and INSTRON or self-made fatigue testing machines, helicopter tail rotor booster fatigue testing testing system Other design ideas and connection methods are the same as those in the first embodiment.

Claims (1)

1. a helicopter tail rotor booster fatigue test system, is characterized in that: it is made up of fatigue tester, Hydraulic Station, rotation direct drive valve, actuator exerciser, digital storage oscilloscope, X-over, upper and lower fixture and helicopter tail rotor booster; Upper and lower fixture is arranged on fatigue tester, helicopter tail rotor booster two ends are arranged on upper and lower fixture, Hydraulic Station is connected with rotation direct drive valve by oil pipe, rotate direct drive valve to be connected with helicopter tail rotor booster again, actuator exerciser is connected with rotation direct drive valve by circuit, and digital storage oscilloscope is connected with actuator exerciser the relevant information showing helicopter tail rotor booster; Wherein, the order of connection of fatigue tester, upper and lower fixture and helicopter tail rotor booster is from top to bottom:

Fatigue tester → upper fixture → helicopter tail rotor booster → lower clamp → fatigue tester

Described fatigue tester is conventional low-frequency fatigue test machine, and in order to apply fatigue load to helicopter tail rotor booster piston, the load range of testing machine need be greater than the test load of helicopter tail rotor booster;

Described Hydraulic Station is conventional hydraulic station, oil transportation mouth and oil return opening need be had, oil transportation mouth is used for rotation direct drive valve conveying liquid force feed, and oil return opening is used for hydraulic oil to pass back into Hydraulic Station, and the oil pressure that Hydraulic Station can provide need be greater than the test oil pressure of helicopter tail rotor booster and can keep stable;

Described X-over is multiple stage rank axial workpieces, is two of the Hydraulic Station joint between hydraulic fluid port and oil pipe, in order to two hydraulic fluid ports of connected pipes and Hydraulic Station;

Described rotation direct drive valve is the accessory be connected with helicopter tail rotor booster, its inside has the aperture of motor control valve, rotate direct drive valve and hydraulic oil is sent to helicopter tail rotor booster, driven plunger moves axially, the motor of the aperture of its operation valve drives by actuator exerciser, to change piston movement direction and speed, form closed-loop control, piston in helicopter tail rotor booster is maintained equilibrium position effectively;

Described actuator exerciser is drive the electronic installation rotating direct drive valve motor, exports control signal, and receive the piston position signal of helicopter tail rotor booster feedback to the motor rotating direct drive valve;

Described digital storage oscilloscope is conventional oscillograph, in order to observe control and the feedback signal of helicopter tail rotor booster;

Described helicopter tail rotor booster is a kind of hydraulic servo driving of two-chamber single-piston rod, and it is made up of piston rod assembly, front end cylindrical shell, rear end cylindrical shell, ring flange and coupling bolt, and whole system is connected by coupling bolt and fixes; Under the control of actuator exerciser, tail-rotor booster provides the servo-actuated equilibrant of tail-rotor leaf aerodynamic force, and lower maintenance balances and stablize in working order to make tail-rotor, and its working hydraulic pressure pressure is 6MPa, and the maximum working load of piston rod is 8kN;

Described upper fixture is the part that Step Shaft and hexahedron are combined into, and its two ends are connected with fatigue tester and helicopter tail rotor booster respectively;

Described lower clamp is heart portion hexahedron part with holes, and its two ends are connected with fatigue tester and helicopter tail rotor booster respectively.