Method for analyzing a coupled vehicle/passenger system
AssigneeCentre National D'Etudes Spatiales
InventorLuc-Olivier Gonidou
Life of this patent
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Abstract
A method for determining, by reanalysis, a vibratory environment of a coupled vehicle/passenger system. A vehicle is subjected to external forces Fext and is coupled to a new passenger including multiple payloads (e.g., x=I, . . . N payload(s)). At the level of vehicle/passenger interfaces Ix, the method comprising a step DET1) for determining, based on reference interfacial acceleration γx_ref of a reference passenger, the interfacial acceleration γx′ relative to the new passenger.
Claims7
A computer implemented method for controlling a mechanical compatibility between a passenger and a vehicle, by determining, by reanalysis, a vibratory ambient of a coupled system including the vehicle and the passenger, the vehicle being subjected to external forces Fext and being coupled to a new passenger comprising x=1, . . . , N payload(s), at vehicle/passenger interfaces Ix, the method comprising the following steps:
- DET 01) determining a reference accelerometric field yx_ref=(y1_ref, y2_ref) at a vehicle/passenger interface of a reference passenger coupled to the vehicle, wherein the reference accelerometric field is determined based on a mechanical model of the reference passenger and a mechanical model of the vehicle;
- and
- DET 1) determining an interfacial acceleration relating to the new passenger different from the reference passenger based on the reference accelerometric field yx-ref and the following relationship:
- γY′x(ω)={I+MREFTOT−1(ω)ΔMxP(ω)}−1·γxref(ω)
- with
- yxref(ω) being vector of accelerations on all degrees of freedom of the vehicle/passenger interface for the reference passenger;
- Y′x(ω) being vector of accelerations on all degrees of freedom of the vehicle/passenger interface for the new passenger;
- ΔMxP(ω)=MxP(ω)−MrefP(ω) with
- MPX(ω) being the interface dynamic mass operator of the new passenger;
- MPref(ω) being the interface dynamic mass operator of the reference passenger;
- and
- MREFTOT (ω) being the interface dynamic mass operator of the vehicle coupled to the reference passenger;
- and
- the operators MXP(ω), MPref(ω) and MREFTOT (ω) being obtained by a direct approach in the following manner:
- M
-
- (
- ω
- )
- =
- 1
- -
- ω
- 2
-
- {
- (
- -
- ω
- 2
-
- M
- jj
- +
- j
-
-
- ω
-
-
- C
- jj
- +
- K
- jj
- +
- jH
- jj
- )
- +
- (
- -
- ω
- 2
-
- M
- ji
- +
- j
-
-
- ω
-
-
- C
- ji
- +
- K
- ji
- +
- jH
- ji
- )
- (
- -
- ω
- 2
-
- M
- ii
- +
- j
-
-
- ω
-
-
- C
- ii
- +
- K
- ii
- +
- jH
- ii
- )
- -
- 1
- (
- ω
- 2
-
- M
- ij
- +
- j
-
-
- ω
-
-
- C
- ij
- +
- K
- ij
- +
- jH
- ij
- )
- }
- where
- M is the mass matrix of the reference passenger, the new passenger, or the vehicle coupled to the reference passenger;
- K is the stiffness matrix of the reference passenger, the new passenger, or the vehicle coupled to the reference passenger;
- C is the viscous damping matrix of the reference passenger, the new passenger, or the vehicle coupled to the reference passenger;
- H is the hysteretic damping matrix of the reference passenger, the new passenger, or the vehicle coupled to the reference passenger;
- and
- I is the identity matrix.
Dependencies are inferred from the claim text.