reaction time of the first test rudder is over-symmetry, and the fault of the test
rudder is reproduced; the reaction time of the second ignition test is symmetrical
and meets the technical requirements.
Later, ignition tests were carried out on the other three sets of steering gear with
the opening of the sliding valve adjusted more symmetrically. The symmetry of
reaction time is well controlled and meets the requirements of technical conditions.
(1) Analysis of Original Static Debugging Technical Indicators
By analyzing the original static debugging technical indicators, it can be found that:
it is the unreasonable requirement of these debugging technical indicators that
results in the serious asymmetry of the sliding valve opening of the test steering
gear.
The original static debugging technical index has the requirement of symmetry
of no-load flow. The factors affecting the symmetry of no-load flow are not only the
symmetry of the sliding valve opening, but also the structural symmetry of the two
channels. For example, working edge roundness, shape, dimension and surface
roughness of ventilation channel, the connection of the air passages between the
parts, the size and shape tolerance of the spool, bush, piston, and cylinder bore of
the slide valve are different. When debugging, the flow asymmetry caused by the
structural asymmetry of the two channels can be achieved by adjusting the opening
of the slide valve. Although the static technical specifications and reaction time can
be qualified in the test through compressed air, the symmetrical change of reaction
time will be caused by the change of sliding valve opening under the working
condition of gas.
(2) Controlling the Symmetry of Slide Valve Opening and Adjusting the
Technical Indicators of Commissioning
According to the above test results and the analysis of the original static debugging
technical indicators, in order to ensure the symmetry of reaction time under gas
working condition, the symmetry of sliding valve opening must be guaranteed. The
measurement of sliding valve opening is based on the position of the spool in zero
alignment. In order to improve the measurement accuracy of sliding valve opening,
the requirement of zero position for the difference of the middle pressure should
also be raised.
Later, the debugging practice of two batches of gas steering engines reflects the
debugging requirements after adjustment, which is quite difficult for batch production. After replacing parts and repeatedly assembling and adjusting, about 10%
of the steering engines still cannot meet the requirements of flow symmetry. In the
face of this situation, it is necessary to find out the influence of flow symmetry on
reaction time symmetry through experiments, and then consider whether it is
allowed to relax the flow symmetry index. For this reason, three sets of steering
engines whose flow symmetry exceeds the standard and other adjustment indexes
meet the requirements are tested for ignition. The results show that the symmetry of
reaction time of the three sets of steering engines is still good when they are ignited.
10.4 Process Technology of Gas Steering Engine
193
rudder is reproduced; the reaction time of the second ignition test is symmetrical
and meets the technical requirements.
Later, ignition tests were carried out on the other three sets of steering gear with
the opening of the sliding valve adjusted more symmetrically. The symmetry of
reaction time is well controlled and meets the requirements of technical conditions.
(1) Analysis of Original Static Debugging Technical Indicators
By analyzing the original static debugging technical indicators, it can be found that:
it is the unreasonable requirement of these debugging technical indicators that
results in the serious asymmetry of the sliding valve opening of the test steering
gear.
The original static debugging technical index has the requirement of symmetry
of no-load flow. The factors affecting the symmetry of no-load flow are not only the
symmetry of the sliding valve opening, but also the structural symmetry of the two
channels. For example, working edge roundness, shape, dimension and surface
roughness of ventilation channel, the connection of the air passages between the
parts, the size and shape tolerance of the spool, bush, piston, and cylinder bore of
the slide valve are different. When debugging, the flow asymmetry caused by the
structural asymmetry of the two channels can be achieved by adjusting the opening
of the slide valve. Although the static technical specifications and reaction time can
be qualified in the test through compressed air, the symmetrical change of reaction
time will be caused by the change of sliding valve opening under the working
condition of gas.
(2) Controlling the Symmetry of Slide Valve Opening and Adjusting the
Technical Indicators of Commissioning
According to the above test results and the analysis of the original static debugging
technical indicators, in order to ensure the symmetry of reaction time under gas
working condition, the symmetry of sliding valve opening must be guaranteed. The
measurement of sliding valve opening is based on the position of the spool in zero
alignment. In order to improve the measurement accuracy of sliding valve opening,
the requirement of zero position for the difference of the middle pressure should
also be raised.
Later, the debugging practice of two batches of gas steering engines reflects the
debugging requirements after adjustment, which is quite difficult for batch production. After replacing parts and repeatedly assembling and adjusting, about 10%
of the steering engines still cannot meet the requirements of flow symmetry. In the
face of this situation, it is necessary to find out the influence of flow symmetry on
reaction time symmetry through experiments, and then consider whether it is
allowed to relax the flow symmetry index. For this reason, three sets of steering
engines whose flow symmetry exceeds the standard and other adjustment indexes
meet the requirements are tested for ignition. The results show that the symmetry of
reaction time of the three sets of steering engines is still good when they are ignited.
10.4 Process Technology of Gas Steering Engine
193