SU1483259A1 - Device for measuring the terrain profile - Google Patents

Abstract

The invention is intended to measure heights in the direction of travel of a vehicle. In order to increase accuracy and expand the functionality, the signal from the acceleration sensor axis 3 of the elastic wheel goes to the integrator 9 and further to the second adder 8. From the output of the deformation sensor 4 in the connection of the elastic wheel axis to the suspension, the signal goes to the second input of the adder 7, from which the resulting signal is fed to the input of the sensor 6 deformation of the elastic wheel. In the second adder 8, the required excess is determined, which, together with the information from the sensor 5, goes to the recorder 10. 4 sludge.

Description

FIG. C

The invention relates to systems for measuring the profile or heights of a terrain using vehicles moving over that terrain and can be used in measuring trace microprofiles prior to conducting tests on the study of the ride and vibro loading of transport systems.

The purpose of the invention is to improve the accuracy of measurement of the relief.

FIG. 1 shows a movable platform with mounted on it the elements of the device, a general view; in fig. 2 - elastic characteristic of the elastic wheel; in fig. 3 - diagram of the forces in the case of dependent wheel suspension; in fig. 4 is a block diagram of the device.

A device for measuring a terrain profile, mounted on a movable platform 1 with elastic wheels 2, contains sensors 3-6, which respectively register the vertical acceleration of the axis of the elastic wheel, the force transmitted to the axis of the elastic wheel from the platform through the suspension (with dependent suspension also from the suspension and wheels of the opposite side), the distance traveled and the deformation of the elastic wheel, adder 7, additional adder 8, block 9 of integration and recorder 10.

The measurements are based on the fact that the height H of the profile under the wheel differs from the value of the vertical displacement YK of the wheel by the amount of deformation of the wheel: H Y + S.

The device works as follows.

When the platform is moving, the signal from one of the outputs of the sensor 3 for the acceleration of the wheel axis is fed to the input of the integration unit 9, the output of which is proportional to the movement of the wheel axis Yx. The integration unit 9 can be made in the form of two series-connected integrators, each of which is an operational amplifier with a capacitive negative feedback.

A signal proportional to the force acting on the wheel axis from the rest of the platform structure is removed from the output of sensor 4. In the case of an independent suspension, this force is equal to the total force in the spring and the shock absorber connecting the wheel axle to the platform. With a bridge circuit, this force will be equal to the resultant of all forces acting on the wheel axis, minus the inertia force (Fig. 3). Sensor 4 can be made in the form of ten

0

five

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five

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five

0

a resistor that measures the deformation of the elastic element connecting the suspension with the wheel axle is proportional to the desired force. In the case of a bridge suspension scheme, such an elastic element, for example, is the section of the car bridge between the wheel axle and the spring, and the required force is equal to the interrupting force in the section where the sensor is mounted.

The signals from the outputs of the sensors 3 and 4 are fed to the corresponding inputs of the adder 7, where the calculation of the total force acting on the wheel axis. From the output of the adder 7, the signal is fed to the input of the sensor 6, in which the elastic characteristic of the elastic wheel is reproduced. Structurally, the sensor 6 can be made in the form of a block of nonlinearities. for which the standard insert of the functional converter can be used, which is included in the set of the non-linearity block set of the NBN-1 series. Depending on the total force R from the output of sensor 6, a signal is taken proportional to a deformation of 5 ± wheels. The signals from the outputs of the sensor and the integration unit 9 are fed to an additional adder 8, where the elevation heights are calculated in accordance with the above expression. From the output of the adder 8, as well as from the output of the sensor 5, the signals go to the recorder 10.

To measure the path profile on one trackway, it is sufficient to install sensors 3, 4 and 6 on one of the wheels of the platform and have one accumulator 7 and 8 and one integration block 9, respectively.

Claims (1)

Invention Formula A device for measuring a terrain profile containing a platform with a suspension, a successively connected vertical acceleration sensor of the elastic wheel, an adder and a deformation sensor of the elastic wheel, a second output of the vertical acceleration sensor of the elastic wheel axis is connected to the integrator input, and the output of the distance sensor is connected to the recorder input, characterized in that, in order to increase accuracy, it is equipped with a second adder and a deformation sensor installed at the junction of the axis of the elastic wheel with weighing, the output of which is connected to the second input of the adder, the first and second inputs of the second adder are respectively connected to the outputs of the elastic wheel deformation sensor and the integrator, and the output is connected to the second input of the recorder. FIG. FIG. 3