Michael Schmiechen, Berlin
News on motions of vehicles

On Weinblum Memorial Lectures 1986/87

A pertinent corespondence triggered by a vain search for publications of the lectures.is to be found on my homepage in the 'Mails on epistemic injustice' and here under
• 'Fremde Federn' .
  

On manoeuvring predictors

The folowing corespondence
• On manoeuvring predictors
  has been triggered by a paper of Knud Benedict, FH Wismar.
  

Maneuvring for hydraulic engineering

The talk by Carl-Uwe Boettner at the Institut für Schiffs- und Meerestechnik
of the Technische Universität Berlin on December 13, 2013, has triggered
the following remarks and reminders concerning my projects and experience on

• maneuvring in restricted waters.
  

LOCIS: LOw Cost Inertial Systems

In my contribution to the VWS Jubilee Meeting 2003 I have mentioned
the develoment and early applications of an

• Low cost inertial system
  based on six strap-down field meters, alias accelerometers, at VWS Berlin.
  
  The complete text and references are also to be found, together with handouts
  and the actual presentation, under 'Centenary of VWS, the Berlin Model Basin,
  in 2003; Programme and Related Material' in the 'Papers on general subjects'
  on my website www.m-schmiechen.de .
  
  As a pastime exercise I have further developed and tested the procedure
  for a given rigid configuration of field meters, an ad hoc 'inertial frame',
  in given transient motions by first
  
• simulating the signals
  and subsequently
• identifying the motions.
  
  As has been mentioned the algorithm accounts for the unknown initial and
  end conditions as well as misalignments of the field meters.
  Both programs in the Mathcad 8.3 environment are felt to be of general interest
  and are published here for ready reference.
  

The Euler-Lagrangean equation:
the meta-theory of motions
of bodies in fluids

In the process of reconstructing the foundations of classical mechanics
the author has drafted the following exposition of 'analytical mechanics'
and the 'variational principles of mechanics', in the context of his treatise
more appropriately called 'global mechanics'or 'aggregate mechanics',
finally precisely
• Partial energy balances.
  The essential result is the state space model for the motions of bodies
  of matter with any number of degrees of freedom moving
  in three-dimensional observation space.
  
  The state space model consists of ...
  1 ... the dynamic state equation, the balance of aggregate momentum,
  for systems with non-holonomic generalised speed, and
  2 ... the kinematic state equation relating the generalised position
  with the non-holonomic generalised speed.
  
  And it is noted that ...
  1 ... the balance of aggregate momentum, the explicit Lagrangean equation, derived
  as system of partial energy balances, is also called the Euler-Lagrangean equation.
  The application of the equation is not limited to holonomic systems.
  2 ... the disadvantage of the usual expositions is the restriction
  of considerations to degenerate kinematic state equations.
  
  The simplest instance of this meta-model is the Euler-Lagrangean equation
  for rigid bodies moving in ideal fluids, which has been derived from first principles
  in the doctoral thesis of the author 1962/64 and has since been used
  in all his work on motions of bodies in vacuo and in fluids.