Boots – shoes – and leggings
Patent
1980-04-30
1983-02-15
Ruggiero, Joseph F.
Boots, shoes, and leggings
244194, 318563, 364163, 364166, 364185, 364457, G06F 1550, G05B 2302, G05B 1142
Patent
active
043744230
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an arrangement for monitoring a rudder control system, containing a transmitter for generating a set-point signal corresponding to the respective desired angular position of the rudder and facilities for turning the rudder subsequently into the angular position provided by the set-point signal, the actual angular position of the rudder being picked up by a receiver which supplies a corresponding control-point signal.
In a rudder control system working according to the principle of displacement control the desired rudder angle is preset by appropriately turning a handwheel provided on the bridge. An angle transmitter, which can be actuated by the handwheel, supplies a set-point signal corresponding to the desired angular position of the rudder. The steering system of the rudder control system responds to the set-point signal and causes the steering gear to turn the rudder into the angular position preset by the set-point signal. If due to faulty operation of the steering system the rudder is not adjusted according to the preset set-point signal, this has to be indicated as quickly as possible.
From German Offenlegungsschrift No. 27 24 990 a monitoring arrangement of the type mentioned initially is already known in which a signal is simulated, with the aid of an analog computer, which reproduces the rudder movement to be expected with a preset set-point signal. The actual position of the rudder is picked up by an angle receiver, using measuring techniques. The control-point signal supplied by the angle receiver is compared with the simulated signal supplied by the analog computer circuit and an alarm is triggered if the difference between the two signals exceeds a preset amount. In order to ensure reliable operation, the individual components of the analog computer circuit provided for simulating the rudder movement must be matched, with respect to their behaviour, as exactly as possible to the behaviour of the mechanical components of the rudder control system. In particular, with selective operation of the steering gear with one or several pumps the analog computer circuit must be switched over accordingly.
It is the object of the invention to produce a monitoring arrangement of the type mentioned initially, in which for the purpose of reliably triggering an alarm only the set-point signal corresponding to the desired angular position and the control-point signal corresponding to the actual angular position are being employed.
This object is achieved by a design of the type mentioned initially which, according to the invention, is characterized by a first limit circuit to which the difference between the set-point signal and the control-point signal is applied and which supplies an error signal if the applied difference between the set-point signal and the control-point signal exceeds a predetermined limit, a differentiating section to which the control-point signal is applied, a second limit circuit, following the differentiating section, which supplies an error signal as long as the rate of change, corresponding to the turning rate of the rudder, of the control-point signal is below a predetermined minimum value, an evaluation circuit to which the output signals of the two limit circuits are applied and which supplies a drive signal for an alarm generator if two error signals are present, provided the error signals do not indicate the condition that the rudder is moving in the direction which reduces the angular difference between the set-point and the control-point signal, and a timing section which enables the alarm generator to be triggered by a drive signal, present at the output of the evaluation circuit, only after a predetermined period of time has elapsed.
In the monitoring arrangement according to the invention, the angular difference between the nominal position and the actual position of the rudder and simultaneously also the rate of turning of the rudder is determined continuously. If the angular difference exceeds a predetermined value and the rate of turning of the
REFERENCES:
patent: 3390614 (1968-07-01), Tatum
patent: 3454752 (1969-07-01), Zavod
patent: 3634746 (1972-01-01), Strege, Sr.
patent: 3925640 (1975-12-01), Duggan
patent: 4078750 (1978-03-01), Tomlinson
patent: 4209734 (1980-06-01), Osder
Kundler Walter
Pientak Reinhold
Schulz Claus
Skerka Wolfgang
Anschutz & Co. GmbH
Ruggiero Joseph F.
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