阅读说明：本技术 一种柴油机运行状态下隔振装置微幅位移测试方法及装置 (Micro-amplitude displacement testing method and device for vibration isolation device in diesel engine running state ) 是由 朱曦 孟亮虎 郑蒙蒙 郭建超 于 2020-04-29 设计创作，主要内容包括：为了解决传统技术中通过分度尺测量而带来的隔振器位移测量精度低的问题,发明提供一种柴油机运行状态下隔振装置微幅位移测试方法及装置,其特征在于：通过传感器分别采集四个隔振器处的竖直位移数据及柴油机轴向位置变化的数据,然后按照柴油机自由端和飞轮端的相对位置将上述的数据分为两组；将上述两组数据进行对比,判断柴油机前后端振动规律的一致性和差异性；最后,结合柴油机轴向位置变化的数据判断柴油机在垂向位移发生变化时是否发生倾斜。本发明所述的装置结构简单,测量精准,相较现有技术,精度和实时性具有较大的提升。(In order to solve the problem of low measurement precision of the displacement of the vibration isolator caused by measurement of a graduated scale in the prior art, the invention provides a method and a device for testing the micro-amplitude displacement of a vibration isolator in a diesel engine running state, which are characterized in that: vertical displacement data and diesel engine axial position change data at the four vibration isolators are respectively collected through sensors, and then the data are divided into two groups according to the relative positions of the free end and the flywheel end of the diesel engine; comparing the two groups of data, and judging the consistency and difference of the vibration rules of the front end and the rear end of the diesel engine; and finally, judging whether the diesel engine is inclined or not when the vertical displacement changes by combining the data of the axial position change of the diesel engine. The device provided by the invention has the advantages of simple structure and accurate measurement, and compared with the prior art, the precision and the real-time performance are greatly improved.)

1. A micro-amplitude displacement testing method for a vibration isolation device in a diesel engine running state is characterized by comprising the following steps: the method comprises the following steps of respectively acquiring vertical displacement data of four vibration isolators and data of axial position change of a diesel engine through sensors, and dividing the data into two groups according to the relative positions of a free end and a flywheel end of the diesel engine; comparing the two groups of data, and judging the consistency and difference of the vibration rules of the front end and the rear end of the diesel engine; and finally, judging whether the diesel engine is inclined or not when the vertical displacement changes by combining the data of the axial position change of the diesel engine.

2. The method for testing the micro-amplitude displacement of the vibration isolation device in the running state of the diesel engine according to claim 1, wherein the method comprises the following steps: the process of comparing the two groups of data is as follows: and simultaneously recording the data tested by the first sensor (1), the second sensor (2), the third sensor (3) and the fourth sensor (4) in a graph, and comparing the change rules of the two groups of sensors.

3. The method for testing the micro-amplitude displacement of the vibration isolation device in the running state of the diesel engine according to claim 1, wherein the method comprises the following steps: the analysis process of the two groups of data combined with the data of the axial position change of the diesel engine comprises the following steps: the axial displacement data is used as an auxiliary analysis parameter, the two groups of vertical displacement data are compared, the axial displacement data is used as a reference, and whether the diesel engine overturns forwards or backwards can be analyzed.

4. A micro-amplitude displacement testing device of a vibration isolation device in a diesel engine running state is characterized by comprising a first sensor (1), a second sensor (2), a third sensor (3), a fourth sensor (4), a fifth sensor (5), a data acquisition instrument (6) and an upper computer (7);

the first sensor (1), the second sensor (2), the third sensor (3) and the fourth sensor (4) are respectively arranged beside the four vibration isolators of the diesel engine;

the data acquisition instrument (6) acquires data of the first sensor (1), the second sensor (2), the third sensor (3), the fourth sensor (4) and the fifth sensor (5) and sends the data to the upper computer (7).

5. The device for testing the micro-amplitude displacement of the vibration isolation device in the running state of the diesel engine as claimed in claim 4, further comprising a base (9) for mounting the diesel engine; the diesel engine (8) is elastically installed on the base (9) through the vibration isolator.

Technical Field

The invention belongs to the technical field of diesel engine testing, and particularly relates to a micro-amplitude displacement testing method and device for a vibration isolation device in a diesel engine running state.

Background

The diesel engine vibration isolation system is a system for installing the diesel engine on a proper elastic device to isolate mechanical vibration transmission, various unbalanced forces and moments can be generated due to the working characteristics of reciprocating machinery when the diesel engine is in an operating state, the unbalanced forces can be directly applied to the vibration isolation device of the diesel engine, and the vibration transmission between the diesel engine and a base is adjusted through the micro-amplitude change of the vibration isolator. The vibration characteristic of the diesel engine and the installation characteristic of the diesel engine can be judged through displacement testing, and data support is provided for the vibration characteristic optimization of the diesel engine and the optimization of the vibration isolation device.

At present, a common graduated scale is usually used for measuring the displacement of the vibration isolator in a static state in a vertical displacement test of the diesel engine vibration isolator, and a common test method is to compare test data before starting and after starting.

Disclosure of Invention

The invention provides a micro-amplitude displacement testing method and device for a vibration isolation device in a diesel engine running state, aiming at solving the problem of low measurement precision of the displacement of the vibration isolation device caused by measurement of a graduated scale in the prior art.

In order to achieve the purpose, the invention adopts the specific scheme that: a micro-amplitude displacement testing method for a vibration isolation device in a diesel engine running state is characterized by comprising the following steps: the method comprises the steps that vertical displacement data of vibration isolators of four machine legs and axial position change data of a diesel engine are collected through sensors respectively, and then the data are divided into two groups according to the relative position of the diesel engine; comparing the two groups of data, and judging the consistency and difference of the vibration rules of the front end and the rear end of the diesel engine; and finally, judging whether the diesel engine is inclined or not when the vertical displacement changes by combining the data of the axial position change of the diesel engine.

A micro-amplitude displacement testing device of a vibration isolation device in a diesel engine running state is characterized by comprising a first sensor, a second sensor, a third sensor, a fourth sensor, a fifth sensor, a data acquisition instrument and an upper computer; the first sensor, the second sensor, the third sensor and the fourth sensor are respectively arranged beside the four vibration isolators of the diesel engine; the data acquisition instrument acquires data of the first sensor, the second sensor, the third sensor, the fourth sensor and the fifth sensor and sends the data to the upper computer.

The micro-amplitude displacement testing device for the vibration isolation device in the running state of the diesel engine further comprises a base for mounting the diesel engine; the diesel engine is elastically installed on the base through the vibration isolator.

Has the advantages that: according to the invention, displacement data is obtained by carrying out displacement tracking measurement on four vibration isolators, the data is grouped and compared according to the positions of the vibration isolators, the consistency and difference of the vibration rules of the front end and the rear end of the diesel engine are obtained, and finally, whether the diesel engine is inclined or not is detected by combining the axial displacement data in the operation process of the diesel engine. The device provided by the invention has the advantages of simple structure and accurate measurement, and compared with the prior art, the precision and the real-time performance are greatly improved.

Drawings

Fig. 1 is a schematic diagram of the mechanism of the present invention.

FIG. 2 is a graph comparing the change of displacement curves in the embodiment I.

FIG. 3 is a comparison graph of the displacement variation law in the power-on state and the power-off state in the embodiment II.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In order to solve the problems of inaccuracy and incapability of recording in real time of the traditional measuring method, the invention provides a testing method for recording the real-time changes of the vertical displacement and the axial displacement of a vibration isolator in the actual running state of a diesel engine and judging the running stability of the diesel engine.

Referring to fig. 1, a micro-amplitude displacement testing device for a vibration isolation device in a diesel engine running state, a base 9 of a diesel engine 8 is installed, and the diesel engine 8 is elastically installed on the base 9 through a vibration isolator; respectively arranging a first sensor 1, a second sensor 2, a third sensor 3 and a fourth sensor 4 near four vibration isolators of a diesel engine foot; the fifth sensor 5 is arranged at the axial end face of the diesel engine; and then the data of the first sensor 1, the second sensor 2, the third sensor 3, the fourth sensor 4 and the fifth sensor 5 are collected by the data collector 6 and are all sent to the upper computer 7.