Abstract: An optimization analysis method includes: a joining candidate setting process of setting a joining candidate at a position that is a candidate for joining the parts assembly; a fixed joining selection process of selecting four or more fixed joining points or fixed joining areas to be necessarily joined for each parts assembly from among the joining candidates set for each parts assembly; and a joining optimization analysis process of setting, in the automotive body model, the fixed joining point or the fixed joining area selected for each parts assembly without being a target of the optimization analysis and an optimal joining candidate to be a target of the optimization analysis, and performing an optimization analysis of obtaining an optimized joining point or joining area that joins the parts assembly in the automotive body model excluding the fixed joining point or the fixed joining area selected for each parts assembly.

Abstract: A vibration and noise reduction analysis device for a panel part of an automobile is configured to reduce vibration and noise of the panel part caused by vibration from a vibration source and a noise source in the automobile and identify a portion at which a weight of an automotive body of the automobile can be reduced. The vibration and noise reduction analysis device includes: an automotive body model acquisition unit; a sectioned region setting unit; a vibration and noise reduction target panel part model setting unit; a vibration mode/equivalent radiation power peak frequency selection unit; a sectioned region weight change peak frequency acquisition unit; a sectioned region weight contribution degree calculation unit; and a vibration and noise reduction and weight reduction portion identification unit.

Abstract: An optimization analysis method for joining locations of an automotive body obtains optimal locations of additional joining points or joining portions for use in joining parts assemblies together in an automotive body model and includes: a step of obtaining a deformation form in a vibration mode occurring in the automotive body model 31 by frequency response analysis; a step of determining a load condition to be given to the automotive body model in correspondence with the deformation form in the obtained vibration mode; a step of generating an optimization analysis model in which additional joining candidates are set at locations to be candidates for joining parts assemblies together; a step of setting an optimization analysis condition; and a step of giving the determined load condition to the optimization analysis model to perform optimization analysis and obtaining the additional joining candidates satisfying the optimization analysis condition as optimized joining points.

Abstract: A layered-composite-member shape optimization analysis method includes: setting, as a design space, an optimization target part of a structural body model of an automotive body; generating a layered block model in the set design space, the layered block model including layers, each layer being a three-dimensional element and having material properties different from each other; connecting the generated layered block model to the part of the structural body model of the automotive body; and inputting an analysis condition, performing optimization analysis on the layered block model as an optimization analysis target, and determining an optimum shape of the layered block model.

Abstract: A vibration noise reduction analysis method for automotive panel parts acquires optimal distribution of beads to be provided in an automotive panel part to reduce noise caused by vibration of the panel part. The vibration noise reduction analysis method is executed by a computer, and includes: an automotive body analysis model acquiring step; an analysis condition setting step; a single-bead arranged area setting step; a bead parameter distribution acquiring step; an equivalent radiated power (ERP) reacquisition step; a bead parameter distribution acquisition step on a minimum ERP in bead-arranged area; and an optimal bead distribution determination step. The bead parameter distribution acquiring step includes: a bead parameter selection step; a bead parameter distribution analysis model generation step; and a bead parameter design variable distribution analysis step.

Abstract: A vibration noise reduction analysis method for automotive panel parts is executed by a computer and used for reducing vibration noise in a panel part caused by vibrations transmitted from an exciter of an automobile to the panel part through vibration transmission frame parts. The vibration noise reduction analysis method includes: an automotive body mesh model acquisition process; a specific frequency band selection process for a vibration noise reduction target panel part model; a vibration transmission frame part model specification process; an individual mesh sheet thickness optimization process; a divided area setting process for a vibration transmission frame part model; an individual divided-area sheet thickness optimization process; and a divided area/optimal sheet thickness determination process for a vibration transmission frame part.

Abstract: A stiffening structure for an automotive door panel part according to the present invention includes a door outer panel 3 made of a metal sheet curved along a height direction, and in which a character line 3a is formed; and an impact beam 5 disposed at an inner surface side of the door outer panel 3. The stiffening structure improves tensile rigidity of the door outer panel 3 by attaching a stiffening member 7 made of resin to the inner surface of the door outer panel 3. The stiffening member 7 includes vertical bone portions 9 extending in a streak shape from the impact beam 5 to the character line 3a along a curve of the door outer panel 3. The vertical bone portions 9 are arranged at a predetermined interval in a front-rear direction of the door outer panel 3, and outer surface of the vertical bone portions 9 is bonded to the inner surface of the door outer panel 3.

Abstract: An automotive frame part that is an A-pillar-lower part, the A-pillar-lower part including: an outer panel having approximately a T-shape in planar view and a cross section intersecting a portion corresponding to a horizontal side and a vertical side of the T-shape is a hat-shaped cross section including a top portion, a side wall portion, and a flange portion; an inner panel being connected to the flange portion and forming a closed cross section with the outer panel; and plastic stiffening members that each have one end connected to an inner surface of the outer panel and another end connected to an inner surface of the inner panel, wherein the shape and the disposition of the stiffening members are set based on an analysis result from a shape optimization analysis method and each of the stiffening members has a columnar shape or a columnar shape with both end parts bulging.

Abstract: A method for analyzing sensitivity of automotive body parts with respect to an automotive body performance of an automotive body including the automotive body parts, the method being executed by a computer and including: acquiring an automotive body model including the automotive body parts modelled with elements; setting: an objective condition related to an automotive body performance of the automotive body model; a constraint condition related to a volume of the automotive body model; and a loading condition to be imposed on the automotive body model; obtaining sensitivities of respective elements that satisfies the objective condition under the loading condition and the constraint condition; and calculating sensitivities of each of the automotive body parts based on the sensitivities of the respective elements.

Abstract: An analysis method of optimizing vibration performance of a part of an automotive body, including: acquiring a maximum displacement of vibration of the part of the automotive body; acquiring a load required for applying a same displacement as the acquired maximum displacement, to the part of the automotive body; setting a design space by setting a part or member that supports the part of the automotive body as an optimization target; generating an optimization block model formed of three-dimensional elements in the set design space; generating an optimization analysis model by combining the generated optimization block model to the automotive body; and acquiring an optimal shape of the optimization block model by: applying the acquired load as a load condition; and performing optimization analysis for the optimization block model taking an inertial force that occurs in the part of the automotive body due to vibration into consideration.

Abstract: A stiffening structure for an automotive door panel part according to the present invention includes a door outer panel 3 made of a metal sheet curved along a height direction, and in which a character line 3a is formed; and an impact beam 5 disposed at an inner surface side of the door outer panel 3. The stiffening structure improves tensile rigidity of the door outer panel 3 by attaching a stiffening member 7 made of resin to the inner surface of the door outer panel 3. The stiffening member 7 includes vertical bone portions 9 extending in a streak shape from the impact beam 5 to the character line 3a along a curve of the door outer panel 3. The vertical bone portions 9 are arranged at a predetermined interval in a front-rear direction of the door outer panel 3, and outer surface of the vertical bone portions 9 is bonded to the inner surface of the door outer panel 3.

Abstract: The analysis method of optimizing a joint location of an automotive body of this disclosure is to determine an additional welded point 75 to be added to an automotive body frame model 31, including: an automobile model generation step S3 to generate an automobile model by joining the automotive body frame model 31 to a chassis model 51 via a joining portion; a driving analysis step S5 to perform a driving analysis of the automobile model to acquire a load generated at the joining portion during driving; an optimization analysis model generation step S7 to generate an optimization analysis model 71 by setting welding candidates 73 on the automotive body frame model 31; an optimization analysis condition setting step S9 to set optimization analysis conditions; and an optimization analysis step S11 to apply the load generated at the joining portion to the optimization analysis mode 71 to select an additional welded point 75 that satisfies the optimization analysis conditions from the welding candidates 73.

Abstract: An automotive body adhesive bonding position optimization analysis method of obtaining an optimum position at which a parts set is adhesive-bonded with a structural adhesive in combination with welding, the method including: disposing an adhesive element as the structural adhesive at a position on a body structure model as a candidate at which adhesive bonding is performed with the structural adhesive; setting an optimization analysis condition including a loading condition applied to the body structure model in optimization analysis, to the body structure model on which the adhesive element is disposed; and performing optimization analysis on the adhesive element as an optimization analysis object in the body structure model to which the optimization analysis condition is set so as to obtain a position of the adhesive element satisfying the optimization analysis condition as the position at which adhesive bonding is performed with the structural adhesive.

Abstract: A layered-composite-member shape optimization analysis method includes: setting, as a design space, an optimization target part of a structural body model of an automotive body; generating a layered block model in the set design space, the layered block model including layers, each layer being a three-dimensional element and having material properties different from each other; connecting the generated layered block model to the part of the structural body model of the automotive body; and inputting an analysis condition, performing optimization analysis on the layered block model as an optimization analysis target, and determining an optimum shape of the layered block model.

Abstract: An automotive frame part that is an A-pillar-lower part, the A-pillar-lower part including: an outer panel having approximately a T-shape in planar view and a cross section intersecting a portion corresponding to a horizontal side and a vertical side of the T-shape is a hat-shaped cross section including a top portion, a side wall portion, and a flange portion; an inner panel being connected to the flange portion and forming a closed cross section with the outer panel; and plastic stiffening members that each have one end connected to an inner surface of the outer panel and another end connected to an inner surface of the inner panel, wherein the shape and the disposition of the stiffening members are set based on an analysis result from a shape optimization analysis method and each of the stiffening members has a columnar shape or a columnar shape with both end parts bulging.

Abstract: The analysis method of optimizing a joint location of an automotive body of this disclosure is to determine an additional welded point 75 to be added to an automotive body frame model 31, including: an automobile model generation step S3 to generate an automobile model by joining the automotive body frame model 31 to a chassis model 51 via a joining portion; a driving analysis step S5 to perform a driving analysis of the automobile model to acquire a load generated at the joining portion during driving; an optimization analysis model generation step S7 to generate an optimization analysis model 71 by setting welding candidates 73 on the automotive body frame model 31; an optimization analysis condition setting step S9 to set optimization analysis conditions; and an optimization analysis step S11 to apply the load generated at the joining portion to the optimization analysis mode 71 to select an additional welded point 75 that satisfies the optimization analysis conditions from the welding candidates 73.

Abstract: A method of setting metal sheet anisotropy information and sheet thickness information for an analysis model of a press-formed panel includes spreading the analysis model of the press-formed panel into a blank shape by analysis of reverse press-forming; acquiring sheet thickness information obtained by the analysis of reverse press-forming; based on a spread-blank-shape and a panel-taking blank shape, acquiring a reference direction of the spread-blank-shape; calculating an angle formed between the reference direction of the spread-blank-shape and each element in the spread-blank-shape, and setting the reference direction for each element of the analysis model of the press-formed panel based on the calculated angle; and setting the sheet thickness information acquired in the sheet-thickness-information acquiring step for each element of the analysis model of the press-formed panel.

Abstract: A method for analysis of shape optimization includes: a design space setting step of setting a design space; an optimization block model generating step of generating an optimization block mode in the set design space; a connection processing step of connecting the generated optimization block model with a structural body model; a material property setting step of setting a material property for the optimization block model; a crashworthy optimum shaping condition setting step of setting a crashworthy optimum shaping condition for the optimization block model; a crashworthiness analysis condition setting step of setting a crashworthiness analysis condition for the structural body model; a three-dimensional element necessity calculation step of executing a crashworthiness analysis on the optimization block model, and calculating information related to necessity of each of three-dimensional elements of the optimization block model; and an optimum shape determining step of determining an optimum shape.

Abstract: Aspects of the present invention include a welding-position optimization analyzing method for spot welding or continuous welding of components constituting a structure model formed of plane elements and/or three-dimensional elements. The method includes defining a to-be-analyzed portion including welding points or welding portions at which the plurality of components are welded; defining at least one of the welding points or at least one of the welding portions in the defined to-be-analyzed portion as a fixed welding point or a fixed welding portion; specifying welding prospects in the to-be-analyzed portion, the welding prospects being regarded as prospects for the welding points or the welding portions; defining an analytic condition applied to the to-be-analyzed portion; and analyzing and/or calculating an optimal welding point or an optimal welding portion that satisfies the analytic condition from among the welding prospects.

Abstract: A method for analysis of shape optimization includes: setting, as a design space, a portion to be optimized in a movable portion; generating, in the set design space, an optimization block model formed of three-dimensional elements and is to be subjected to analysis processing of optimization; connecting the generated optimization block model with a structural body model; setting a material property for the optimization block model; setting an optimization analysis condition for finding an optimum shape of the optimization block model; setting a multi-body dynamics analysis condition for performing multi-body dynamics analysis on the structural body model with which the optimization block model has been connected; and executing, based on the set optimization analysis condition and multi-body dynamics analysis condition, the multi-body dynamics analysis on the optimization block model and finding the optimum shape of the optimization block model.