JPH04219865A - Facility equipment monitor system for building - Google Patents

Abstract

PURPOSE:To discriminate the state of each equipment at a transmission terminal equipment without providing a metal wire between the facility equipment and the transmission terminal equipment by providing the transmission terminal equipment with a process part including a fast Fourier transformation value discrimination means. CONSTITUTION:Plural transmission terminal equipments 1 which are connected to a central processing unit 3 collect the operation sounds of peripheral facility equipments 4 through plural sound collection devices 10a and 10b, a level discrimination means 12 the levels of the collected operation sounds, and a position discrimination means 13 discriminates the facility equipment 4 from the sound pressure levels from the sound collection devices 10a and 10b. Then the fast Fourier transformation value discrimination means 15 compares the value, obtained by analyzing the sound pressure signal waveform by a fast Fourier transforming means 14, with a fast Fourier transformation value in normal operation which is stored previously. Thus, the normal operation state, stop state, or specific trouble state of the monitored facility equipment is discriminated and sent to the central processing unit 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building equipment monitoring system comprising a central processing unit and a plurality of transmission terminal devices that transmit the status of equipment installed at various locations in a building. Equipment installed in buildings in recent years, such as air conditioning equipment, power transmission and distribution equipment,
As the number of various devices such as motors (elevators, etc.) has increased, the number of devices and wiring for maintaining and managing each facility has also increased. When monitoring equipment installed in spatially distant locations, such as in buildings, a large number of transmission terminal devices are installed to detect the status of each equipment, and the status is transmitted from these transmission terminal devices to a central processing device. Collect signals. At that time, signals indicating the status of each device are extracted and each signal is collected in the transmission terminal device, and the transmission terminal device sends each signal to the central processing unit, but as the number of devices increases, the amount of status signals to be extracted is increasing. As the number of devices increased, wiring became more and more time-consuming.

0002

2. Description of the Related Art FIG. 6 shows an example of the configuration of a conventional building equipment monitoring system. In the figure, 60 is a central processing unit (master station) installed in one part of the building, and is a device for collectively maintaining and managing equipment installed in the building. This central processing unit 60 is connected to a large number of transmission terminal devices 1 to n that are installed at various locations in the building via a cable 61.
(62) is connected. Each transmission terminal 62 is connected to one or more equipment 64 installed in the same room.
(indicated by devices a, b, c, . . . ) and are connected by metal wires 63. In this example, transmission terminal 1 is equipment equipment a.
, equipment b, and the transmission terminal 2 is connected to equipment c and equipment d.

[0003] In this conventional configuration, each transmission terminal 62 is
When the central processing unit 60 receives a status signal indicating the status (in operation, stopped) of the equipment 64 connected to each device via the metal wire 63 and gives an instruction to each transmission terminal 62, the corresponding transmission terminal 62 transmits status signals of each equipment 64 connected to itself. Note that a signal indicating an alarm for notifying the occurrence of an abnormality in the equipment is similarly received from the equipment 64 and transmitted to the central processing unit 60 .

0004

[Problem to be Solved by the Invention] In the conventional configuration described above, in order to notify each transmission terminal device of the status of the equipment, it is necessary to wire a large number of metal wires between the terminal boards of each equipment. However, there is a problem in that each of the equipment and the transmission terminal equipment requires space to accommodate the metal wire. Additionally, some new equipment is not equipped with a circuit that outputs a signal that indicates the status, so when it is installed in a building, a new circuit that outputs the status signal is added, and a metal wire is connected between it and the transmission terminal equipment. There was a problem that wiring work was required. SUMMARY OF THE INVENTION An object of the present invention is to provide a building equipment monitoring system that allows the status of each piece of equipment to be identified at a transmission terminal device without providing metal wires between the equipment and the transmission terminal device.

[0005]

[Means for Solving the Problems] FIG. 1 is a diagram showing the basic configuration of the present invention. In FIG. 1, 1 is a transmission terminal device, 10a,
10b is a sound collection device, 11 is a processing unit, 12 is a level judgment means, 13 is a position judgment means, and 14 is a fast Fourier transform (F
FT) means, 15 is a fast Fourier transform value (FFT value) determination means, 16 is the previous sound pressure level, the collected sound pressure level at stop, normal operation, abnormality, and Fourier transform value at normal time. 17 is a transmission section, 2 is a communication line, 3 is a central processing unit, and 4 is a plurality of equipment.

According to the present invention, each transmission terminal device is provided with a plurality of sound collecting devices, the sound collecting device collects the sound generated by the equipment, and when the transmission terminal device receives the collected sound signal, it adjusts the sound pressure of the signal. The level is identified and compared with the pre-registered normal level, and if there is a change, the position is determined and fast Fourier transform (FF
T), the resulting value is compared with the registered normal FFT value, and if an abnormal state is detected, the central processing unit is notified. Further, the sound pressure signals collected by the sound collector are sent to the central processing unit, and the central processing unit determines the status of each transmission terminal device.

[0007]

[Operation] In FIG. 1, a metal wire is not wired between the transmission terminal device 1 and the equipment 4, and at least two sound collecting devices 10a and 10b that collect the sound generated by the equipment 4 are connected to the transmission terminal equipment 1. Provided for. The plurality of sound collection devices 10a and 10b are arranged so that it is possible to identify which of the plurality of equipment 4 is generating a sound. The transmission terminal device 1 is a sound collection device 10
When a signal representing the sound pressure level is input from a and 10b, it is processed by the processing section 11. First, the input sound pressure level signal is compared in the level determining means 12 with data representing the previous sound pressure level stored in the storage unit 16, and it is determined whether the sound pressure level has decreased from the previous time. If the change occurs, the position determination means 13 determines the difference between the signals from the two sound collection devices 10a and 10b to determine which device of the equipment 4 has changed. Next, the sound pressure level at the time of stop stored in the storage unit 16 is compared with the sound pressure level at the time of stop, and if the two are similar, it is determined to be in the stop state, and a signal indicating which equipment 4 is in the stop state is sent to the transmission unit 17. Output.

[0008] If it is not in the stopped state, the position determining means 13
The sound pressure level of each equipment is determined based on the difference between the two sound pressure levels. The level determining means 12 compares the determined sound pressure level with the normal sound pressure level of the equipment stored in the storage unit 16, and if the difference is within a certain range, it is determined to be normal, and if the difference is not, it is determined to be normal. In case,
Next, a fast Fourier transform (FFT) means 14 digitizes the sound pressure level signal waveform and converts the sound pressure level time series data into frequency series data by fast Fourier transform analysis.

[0009] Next, the FFT value determining means 15 compares the converted FFT analysis value with the FFT analysis value in the normal state stored in the storage unit 16 to determine whether or not the difference is within a certain range. , if it is within a certain range, it is determined that it is operating normally; otherwise, it is determined that it is operating abnormally, and the transmission unit is notified. Transmission section 1
7 sends signals corresponding to the states of each equipment 4, such as normal state, abnormal (alarm) state, and stopped state, which are the results of processing in the processing unit 11, to the central processing unit 3 via the communication line 2. Transmit. In this way, the central processing unit 3 can constantly monitor the status from each transmission terminal device 1, and if an abnormal condition occurs, it can immediately deal with it.

[0010] In the above configuration, the processing unit 11 and the storage unit 16 of the transmission terminal device 1 determine the status.
These functions are provided in the central processing unit 3, and the signals from the sound collection devices 10a and 10b of each transmission terminal device 1 are collected by time division, and the corresponding data is stored in the storage unit of the central processing unit 3 in advance. By doing so, the state can be determined through intensive processing.

[0011]

[Example] Figure 2 is a system configuration diagram of the example, Figure 3 is a processing flow 1 in the transmission terminal equipment, Figure 4 is a processing flow 2 in the transmission terminal equipment, and Figure 5 is an example of sound pressure waveforms generated from equipment. be. The system in FIG. 2 includes a central processing unit 20
A plurality of transmission terminal devices 22 are sequentially connected to each other by communication lines 21, and each transmission terminal device 22 has two microphones (R on the right side and L on the left side) facing the equipment (not shown) to be monitored. ) 23 is provided. Each transmission terminal device 22 is placed, for example, on a different floor or in a different room in a building, and the central processing unit 20 is installed in a monitoring department on a specific floor.

In the above system, the details of the monitoring process executed in the transmission terminal device 22 will be explained using the process flows shown in FIGS. 3 and 4. First, a storage device (not shown) in the transmission terminal device 22 (storage unit 16 in FIG.
The sound pressure level during normal operation and stoppage of each suspected monitoring equipment device and the FFT frequency series data during normal operation are registered in the storage device, and the data is stored in the storage device for each sound collection operation at that time. Data representing the sound pressure level of is stored, and is referred to as previous data when processing the next collected sound signal.

[0013] In this state, when processing of the transmission terminal device is started, sound is collected by two microphones (L, R) (Fig. 3
30). The collected sound pressure level is compared with the level at the time of previous sound collection to determine whether there has been a change, and if there has been no change, the process returns to step 30 (step 31). If there is a change, it is determined whether the sound pressure level has risen above the previous sound pressure level (32).

[0014] If the sound pressure has not risen (when it has fallen), the location of the device where the sound pressure has fallen is determined from the sound pressure difference between the two microphones (L, R), and the corresponding equipment is identified (33).
, compare it with the pre-registered level when the relevant equipment is stopped and determine whether it is over (or under) a certain value Y (34), and if it is not over (under), the central processing unit In response, it sends out that the equipment concerned is in a stopped state (35, 36).

[0015] If the above judgment results in over (under), or if the sound pressure has increased since the previous sound collection, N
The collected sound waveforms are sampled for only seconds (37), and time-series digitization (AD conversion) is performed (38). Note that this AD conversion is executed by an AD conversion microcomputer or the like built in the transmission terminal device. Next, fast Fourier transform (FFT) is performed (39).

Next, proceeding to the process shown in FIG. 4, for the digital time series signal obtained by AD converting the above sampling output, the position of the device where the sound pressure has increased or decreased is determined from the sound pressure difference between the L and R microphones. and identifies (identifies) the equipment that has changed (40 in FIG. 4). Next, it is determined whether the difference between the pre-registered sound pressure level and the normal sound pressure level of this equipment is over (under) a certain value Y (41). At this time, the number of operating equipment is also determined based on the sound pressure level. If the value is not over (under) the fixed value Y, a signal indicating the normal state is sent to the central processing unit (42, 43).

[0017] If over (under), FFT
Compare the total value of the values with the pre-registered normal FFT total value to determine whether it is over (under) a certain value Z (44), and if it is not over (under), there is a problem. The first process in FIG. 3 (step 30) assumes that there is no
Return to If it is over (under), it sends a message to the central processing unit that the equipment in question is in an abnormal (alarm) state (46).

Next, an example of a sound pressure waveform generated from the equipment shown in FIG. 5 will be explained. This example is a waveform example for one air conditioner.A. The waveform is a collected waveform in the normal (normal) on state. B. The waveform is the collected waveform in the normal off state, and the sound pressure signal at a certain level is the noise generated around the microphone. Also, C. is the collected sound waveform when this air conditioner malfunctions (belt slipping).

The above A. The amplitude values for each frequency when FFT analysis is performed on the collected waveform in the normally on state shown in D. Shown below. For this normal analysis value, C. Regarding time-series signals (digital signals) at the time of failure such as F
When performing FT analysis, E. The frequency-corresponding amplitude values shown in are obtained. D. If the value of E. is registered in advance as the normal FFT value, E. By comparing the results with analysis results such as the above, it can be immediately determined that the equipment in question is at fault.

In the processing flows shown in FIGS. 3 and 4 above, it is determined whether the monitored equipment is in a normal operating state, a stopped state, or a fault (alarm) state based on the collected sound signal. By registering in advance the FFT analysis value corresponding to the type, the type of failure can be determined. In addition, the central processing unit (20 in Figure 2) sequentially collects the collected sound signals from each transmission terminal equipment, and processes the status determination of the equipment of each transmission terminal equipment (according to the processing flow in Figures 3 and 4). It is clear that the same can be configured to be executed sequentially in a time-sharing manner.

[0021]

[Effects of the Invention] According to the present invention, there is no need to arrange metal wires for transmitting status signals between each transmission device and each equipment in order to monitor equipment in a building. There is no need to modify the equipment to take it out, which simplifies the installation of the monitoring device and allows the transmission terminal equipment and equipment to be made smaller. This also simplifies the installation work of equipment monitoring systems.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle configuration of the present invention.

FIG. 2 is a system configuration diagram of the embodiment.

FIG. 3 is a processing flow 1 in a transmission terminal device.

FIG. 4 is a processing flow 2 in the transmission terminal device.

FIG. 5 is an example of a sound pressure waveform generated from equipment.

FIG. 6 is a configuration example of a conventional building equipment monitoring system.

[Explanation of symbols]

1 Transmission terminal devices 10a, 10b Sound collection device 11 Processing section 12 Level determination means 13 Position determination means 14 Fast Fourier transform (FFT) means 15
Constituent Fourier transform value (FFT value) determination means 16 Storage section 17 Transmission section 2 Communication line 3 Central processing unit 4 Equipment equipment

Claims (2)

[Claims] Claim 1: In a building equipment monitoring system consisting of a central processing unit and a plurality of transmission terminal devices that transmit the status of equipment installed at various locations, each transmission terminal device collects the operating sounds of surrounding equipment. A level determining means comprising a plurality of sound collecting devices that make a sound and determining the level of the operation sound collected by the sound collecting device; a position determining means for identifying equipment from the sound pressure level from the plurality of sound collecting devices; The processing unit includes a fast Fourier transform value determining means that compares the value obtained by analyzing the sound pressure signal waveform using the fast Fourier transform means with a pre-stored fast Fourier transform value during normal operation. , a building equipment monitoring system that is characterized by determining whether it is in a stopped state or a specific failure state and sending the status to a central processing unit. Claim 2: In a building equipment monitoring system consisting of a central processing unit and a plurality of transmission terminal devices that transmit the status of equipment installed at various locations, each transmission terminal device collects the operating sounds of surrounding equipment. The central processing unit includes a plurality of sound collecting devices that emit sound, and the central processing unit collects sound signals from each of the sound collecting devices from each transmission terminal device and determines the level of the operation sound collected by the sound collecting device. and a position determination means for identifying the equipment from the sound pressure level from the plurality of sound collecting devices;
The processing unit includes a fast Fourier transform value determining means that compares the value obtained by analyzing the sound pressure signal waveform using the fast Fourier transform means with a pre-stored fast Fourier transform value during normal operation. , a building equipment monitoring method characterized by determining whether it is in a stopped state or a specific failure state.