JPH065668Y2 - Data acquisition device for tracking analysis device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to improvement of a data acquisition device in a tracking analysis device.

[Prior Art] Conventionally, there is a tracking analysis device as a device for performing tracking analysis of a rotating body or the like. In this device, the vibration waveform from the rotating body is temporarily stored in the memory, and then only the necessary data is extracted and analyzed.

[Problems to be Solved by the Invention] However, in the conventional tracking analysis device, all the data of the vibration waveform detected from the rotating body is stored in the memory, so that even unnecessary data is stored in the memory. There is a problem in that a large-scale memory is required and the load on the central processing unit (CPU) is large.

An object of the present invention is to solve such a problem, and to provide a data collecting device used for collecting data in a tracking analysis device, in which only data of a period to be analyzed is collected and stored in a memory. The present invention intends to realize a data collection device that stores the data, does not require a large-scale memory, and has a reduced load on the CPU.

[Means for Solving Problems] In order to achieve such an object, the present invention provides a tracking analyzer that measures an analog signal and a periodic signal output from a measurement target and performs tracking analysis on the analog signal. In the data collection device used, a period measuring circuit for measuring the period of the periodic signal, a unit for storing a preset period to be measured in a memory and sequentially outputting the set period, the period A comparator that compares the period measured by the measurement circuit with the output set period and outputs a match signal when they match, and an analog signal given by the measurement target when the match signal is output from this comparator And an analog-to-digital conversion device for performing digital conversion and sequentially storing it in a built-in memory.

[Operation] In the present invention, the comparator compares the measurement cycle with the set cycle preset in the memory. A plurality of measurement cycles can be set, but an analog signal when a periodic signal matching the set cycle is given is digitally converted by an analog / digital converter and stored in a memory.

An analog input signal in a cycle that does not match the set cycle is not taken into the memory.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.
FIG. 1 is a block diagram of the essential parts showing an embodiment of a data collection device of a tracking analysis device according to the present invention. Here, the case where the vibration waveform signal from the rotating body is stored as an input is taken as an example. In the figure, 1 is a cycle measuring circuit, 2 is a clock generator for generating a reference clock required for cycle measurement, 3 is a central processing unit (hereinafter referred to as CPU), 4 is memory, 5 is an undressed controller, 6 Is a comparator, and 7 is an analog-to-digital converter (hereinafter referred to as an AD converter) which digitally converts an analog input signal and stores the data in a built-in memory.

The measurement target outputs an analog signal having a vibration waveform and a periodic signal (pulse signal) representing the cycle thereof. The periodic signal is given to the period measuring circuit 1 and the analog signal having the vibration waveform is given to the AD converter 7. . The cycle measuring circuit 1 measures the time of one cycle of the cycle signal based on the clock from the clock generator 2. The output of the cycle measuring circuit 1 and the value output from the memory 4 are input to the comparator 6, and when the two match, a match signal is output.

A desired cycle is preset in the memory 4 by the CPU 3 in order to specify in which cycle the data is to be collected. There may be a plurality of setting cycles.

When the coincidence signal is input from the comparator 6, the AD conversion device 7 AD-converts the vibration waveform signal from the measurement target and stores it in the built-in memory. The control when storing in the memory is CPU
It is performed by 3.

The undress controller 5 outputs an address when the set cycle data is output from the memory 4. The initialization of the address is performed by the CPU 3, but thereafter, every time a coincidence signal is output from the comparator 6. Will be updated. C
The PU outputs the contents of the memory 4 (new setting cycle) based on this update address.

The operation in such a configuration will be described below with reference to the operation flow of FIG. 2 and the timing chart of FIG.

(1) The period T of the periodic signal given from the object to be measured and shown in FIG. 3 (a) by the period measuring circuit 1 is based on the reference clock shown in FIG. 3 (b) given from the clock generator 2. To measure.

(2) The comparator 6 compares the measurement cycle T with the output from the memory 4 (preset setting cycle T1), and if they match, outputs the match signal shown in FIG.

If they do not match, the above operation (1) is repeated. (3) AD
The conversion device 7 starts AD conversion of the vibration waveform given from the measurement object by the coincidence signal output of the comparator 6 as shown in FIG. 3D, and stores the conversion value in the built-in memory.

(4) The address controller 5 updates the address by the coincidence signal and gives it to the memory 4, but the CPU judges whether the setting cycle T ₁ output from the memory is the final setting cycle T _{n, and} if they are equal, End the cycle measurement operation,
If they are not equal, the contents of a new address (new setting cycle T ₂ ) are output from the memory under the control of the CPU 3 and
The operations of (1) to (4) are repeated.

When the data is stored in the memory of the AD converter 7, it is possible to store the group of data to be stored and the period T ₁ (i = 1, ..., N) in association with each other. The control in this case is performed by the CPU 3.

The data thus measured and stored in the memory is CP
U3 can output to the outside as needed.

[Advantages of the Invention] As described in detail above, according to the present invention, since only the data of the required cycle is collected, it is not necessary to collect the data of the cycle not required, and the large scale memory is used. It is possible to collect the necessary data without fail.

Therefore, the memory can be small in size, the memory can be effectively used, and the load on the CPU can be reduced. Further, there is an advantage that a desired cycle can be set arbitrarily.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a data collection device of a tracking analysis device according to the present invention, FIG. 2 is an operation flow for explaining the operation of the present invention, and FIG. Is a time chart for explaining the operation. 1 ... Cycle measuring circuit, 2 ... Clock generator, 3 ... C
PU, 4 ... Memory, 5 ... Address controller,
6 ... comparator, 7 ... AD converter.

Claims (1)

[Scope of utility model registration request] 1. A data collection device used in a tracking analysis device for measuring an analog signal and a periodic signal output from a measurement object and performing tracking analysis of the analog signal, the period measurement measuring the period of the periodic signal. A circuit, a unit for storing one or a plurality of cycles to be measured in advance in a memory, and a means for sequentially outputting the set cycles when there are a plurality of set cycles; And the output of the cycle measurement circuit, and outputs a coincidence signal when both coincide with each other, and when the coincidence signal is output from this comparator, the analog signal is digitally converted and stored in a built-in memory. It is equipped with an analog-to-digital converter that stores sequentially, and only the analog signal in a desired set cycle is digitally converted and stored in the memory. A data collection device for a tracking analysis device characterized by the above.