JPH06247395A - Flight data recorder - Google Patents

Abstract

PURPOSE:To record flight data over a long period of time without increasing the size and weight of a flight data recorder. CONSTITUTION:A flight data recorder includes an internal storage medium 7, an external memory 14 and a control circuit 13, and the control circuit has the function of selecting at least maintenance data from data inputted thereto from an airframe sensor and storing it in the external memory 14; the maintenance data which need be recorded continuously over a long period of time is recorded in the external memory 14, and airframe information recorded in the flight data recorder is utilized in the maintenance of equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides information for investigating the cause of an accident when the aircraft encounters an unexpected accident by recording the aircraft information and the voice of a pilot mounted on the aircraft. It concerns flight data recorders.

[0002]

2. Description of the Related Art When mounted on an aircraft, aircraft information during flight and voices of pilots are recorded, and when an unexpected accident occurs, it is collected and analyzed, and the contents of the record are analyzed to investigate the cause of the accident. There is a flight data recorder.

This flight data recorder is required to be lightweight because it is housed in a solid container and mounted on an aircraft so that it will not be damaged even in a severe situation when an accident occurs. For small aircraft such as helicopters,
It is especially important to reduce the size and weight.

FIG. 2 shows a system block diagram of a flight data recorder. In the figure, 1 is an area microphone, 2 is an interactive voice input device, 3 is an airframe sensor, and the area microphone 1 records in-flight noise. As the voice signal, the conversation voice input device 2 uses the on-board radio to communicate with the ground station or another aircraft as the voice signal, and the body sensor 3 causes the aircraft engine state, the operating state, and the navigation. Data such as information is input to the flight data recorder 4.

The flight data recorder 4 comprises a recorder control circuit 5 and a storage section 6, and information from the area microphone 1, the conversation voice input device 2 and the body sensor 3 is first inputted to the recorder control circuit 5. , The recorder control circuit 5
Performs a control for converting the voice signal and the data signal into a predetermined format and writing the same in the storage unit 6. The storage unit 6 has a magnetic tape and a semiconductor memory as the internal storage medium 7, and the internal storage medium 7 is damaged even if it is hit by a strong impact, pressure, fire, etc. due to an explosion, flame, or collision due to an accident. In order not to do so, the internal storage medium 7 is housed in a rigid container.

A conventional flight data recorder 4 will be described with reference to FIG.

The recorder control circuit 5 mainly comprises an airframe sensor interface circuit 8, a control circuit 9, and a voice input circuit 1.
0, a recorder drive circuit 11, and the storage unit 6
The internal storage medium 7 is stored in a rigid container 12.

The machine body sensor interface circuit 8 is an interface section of the machine body sensor, and takes in data input from the machine body according to various interface conditions.
The control circuit 9 is a control circuit for converting the data from the sensor interface unit into a prescribed format. The voice input circuit 10 is a voice input circuit. Since the inputted voice is amplified into a prescribed signal and then written in the recorder,
It outputs to the recorder drive circuit 11. The recorder drive circuit 11 includes the control circuit 9 and the voice input circuit 1.
It is for writing data input from 0 to the internal storage medium 7.

[0009]

According to the Flight Data Recorder's Minimum Operational Performance Specification (ED-56), the recording time of the conventional flight data recorder is at least 30 or 60 minutes. In addition, when recording data, the recording time is often determined by the time of one flight. Therefore, a recording capacity of about 2 to 4 hours is sufficient for a small helicopter or the like.

However, in recent years, studies have been conducted to utilize the machine body information recorded in the flight data recorder for the maintenance of the equipment, and a part thereof is in the practical stage.

When the flight data is used for maintenance, it is necessary to record all the airframe sensor information for a long time from the time of operation inspection before the flight to the end of the maintenance after the airframe has returned to the airframe. In addition, it is inconvenient to retrieve the recorded data from the flight data recorder for each flight, and if you forget to retrieve the data, the data for the next flight will be overwritten, and the data will be deleted as continuous maintenance data. There is a possibility that it will become difficult to perform maintenance work at a later date.
Therefore, it is desired to increase the capacity of the recording medium so that the airframe sensor information can be stored for a long period of time.

In the conventional flight data recorder, in order to increase the recording capacity, the magnetic tape must be increased in size or the number of semiconductor memories must be increased. This means that the flight data recorder is increased in size and weight. There was a problem connected to.

The present invention has been made in view of the above circumstances.
It is possible to record flight data for a long time without increasing the size and weight of the data recorder.

[0014]

The present invention comprises an internal storage medium, an external memory, and a control circuit, which selects at least maintenance data out of data input from a machine body sensor, It is characterized by having a function of recording in a memory.

[0015]

[Operation] Maintenance data, which requires continuous and long-term recording, is recorded in an external memory, so flight
The aircraft information recorded in the flight data recorder can be used for the maintenance of the equipment without causing the data recorder to become large and heavy.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the same parts as those shown in FIG. 3 are designated by the same reference numerals, and the detailed description thereof will be omitted.

The recorder control circuit 5 mainly comprises a machine body sensor interface circuit 8, a control circuit 13, an external memory 14,
It is composed of a voice input circuit 10 and a recorder drive circuit 11, and the internal storage medium 7 of the storage section 6 is housed in a solid container 12.

The machine body sensor interface circuit 8 takes in the data input from the machine body sensor and outputs it to the control circuit 13. The control circuit 13 converts the data from the sensor interface unit into a prescribed format, further selects data to be used for maintenance, samples it at prescribed intervals, converts it into a predetermined digital signal and outputs it to the external memory 14. To do. The external memory 14 records and stores the maintenance data sampled by the control circuit 13. The voice input circuit 10 is a voice input circuit, and outputs the input voice to the recorder drive circuit 11 in order to write it into a recorder after amplifying it into a prescribed signal. The recorder drive circuit 11 includes the control circuit 1
3. Write the data input from the voice input circuit 10 into the internal storage medium 7.

The sampling period of the control circuit 13 and the items of the recording and storage information are MIL-STD-2.
124FLIGHT DATA RECORDER FUNCTIONAL STANDARDS FO
Specified in R.

Airframe sensor information is continuously sampled and recorded sequentially. This is because, in accident analysis and the like, it is necessary to continuously observe and analyze the operating status of each device before the accident occurs. However, data used for maintenance need not be continuously recorded. For example, considering the engine speed as an example, the data that is important for maintenance includes the accumulated engine usage time, the number of times the upper limit is exceeded, and the accumulated usage time for each rated speed (exp).
These are cumulative usage time at rated 100%, cumulative usage time at rated 90%, and so on. It is not necessary to record the sampled values as continuous data as they are, and event changes of the airframe sensor are important.

Therefore, the input information from the airframe is recorded in a specified sample for accident analysis, and when used for maintenance, only the event information and the accumulated status are recorded, so that many memory media can be recorded. You can accumulate maintenance data without needing it.

The control circuit 13 outputs the continuous sample data to the recorder drive circuit 11 as described above, detects the variation amount of each sample data of the sensor information, and outputs the continuous sample data to the external memory 14 only when the variation amount is larger than the specified variation amount. Control to accumulate.

This has the same effect as data compression,
1/2 to 1/1 of continuous data under normal aircraft operating conditions
It is possible to compress to 0. Therefore, by adding memory to the outside, not only one flight time,
It is possible to accumulate maintenance data for about one week.

Therefore, maintenance data for a long period of time can be recorded without increasing the capacity of the internal storage medium 7.

[0026]

As described above, according to the present invention, instead of storing maintenance data in the internal memory section of the encloser, an external memory is added to the recorder control section to compress and store machine body sensor information. This makes it possible to store maintenance data for a long time without significantly changing the size and weight of the device, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a block diagram of an essential part showing an embodiment of the present invention.

FIG. 2 is a block diagram of a flight data recorder.

FIG. 3 is a block diagram of a main part of a conventional example.

[Explanation of symbols]

 5 recorder control circuit 6 storage unit 7 internal storage medium 8 airframe sensor interface circuit 10 voice input circuit 11 recorder drive circuit 13 control circuit 14 external memory

Claims (2)

[Claims] 1. An internal storage medium, an external memory, and a control circuit are provided, and the control circuit has a function of selecting at least maintenance data from data input from the machine body sensor and recording it in the external memory. A flight data recorder characterized by that. 2. The flight data recorder according to claim 1, wherein the maintenance data is stored in the external memory only when the amount of change is larger than the specified amount of change.