Abstract: A vibration control device of a plate-like member 11 includes: a plurality of piezoelectric element actuators 14; at least one piezoelectric element sensor 15; and a control circuit 17 that performs feedback control of operation of the piezoelectric element actuators 14 based on an output voltage of the piezoelectric element sensor 15 so as to suppress vibration of the plate-like member 11. A layout of the piezoelectric element sensor 15 and the piezoelectric element actuators 14 is set such that anti-resonance occurs in an output voltage of the piezoelectric element sensor 15 in a range where the vibration frequency of the plate-like member 11 is equal to or less than a predetermined value. Therefore, generation of noise can be prevented at the frequency. As a result, a gain can be increased at a control target frequency. Therefore, vibration can be suppressed, and noise can be reduced.

Abstract: A device for damping a plate-shaped member includes a piezoelectric element actuator, a piezoelectric element sensor, and a control circuit which carries out feedback control of operation of the piezoelectric element actuator based on an output voltage from the piezoelectric element sensor so as to suppress vibration of the plate-shaped member. The control circuit includes a low pass filter which reduces a high frequency gain of a voltage inputted into the piezoelectric element actuator in a region in which a vibrational frequency of the plate-shaped member is a predetermined value or greater. Therefore, amplification of vibration in such a frequency region can be suppressed. Accordingly, a feedback gain is increased by a control objective frequency, so that vibration can be suppressed, and noise accompanying the vibration can be reduced.

Abstract: A vibration control device of a plate-like member 11 includes: a piezoelectric element actuator 14 and a piezoelectric element sensor 15 fixed to a surface of a plate-like member 11; and a control circuit 17 that performs feedback control of operation of the piezoelectric element actuator 14 based on an output voltage of the piezoelectric element sensor 15 so as to suppress vibration of the plate-like member 11. The control circuit 17 applies any voltage in a range where a vibration frequency of the plate-like member 11 is equal to or less than a predetermined value based on characteristics of an output voltage of the piezoelectric element sensor 15 so as not to generate noise in a range of 100 Hz or less. Therefore, by increasing a feedback gain, vibration can be suppressed, and noise generated by the vibration can be reduced.

Abstract: A vibration control device of a plate-like member 11 includes: a plurality of piezoelectric element actuators 14; at least one piezoelectric element sensor 15; and a control circuit 17 that performs feedback control of operation of the piezoelectric element actuators 14 based on an output voltage of the piezoelectric element sensor 15 so as to suppress vibration of the plate-like member 11. A layout of the piezoelectric element sensor 15 and the piezoelectric element actuators 14 is set such that anti-resonance occurs in an output voltage of the piezoelectric element sensor 15 in a range where the vibration frequency of the plate-like member 11 is equal to or less than a predetermined value. Therefore, generation of noise can be prevented at the frequency. As a result, a gain can be increased at a control target frequency. Therefore, vibration can be suppressed, and noise can be reduced.

Abstract: A vehicle body structure capable of preventing a bumper beam of another vehicle from riding over the rear part of the vehicle body. A vehicle body structure (10) is provided with a rear side door (13) located forward of a rear wheel (17) with respect to the vehicle body, and the rear side door is provided with a rear door beam (21) extended in the front-and-rear direction of the vehicle body. The vehicle body structure is provided with a side member upper section (56) extending toward the rear of the vehicle body from a rear wheel arch (33) and provided on a line extended from the rear door beam (21), and also with a side member lower section (57) extending on a down grade from the rear section (67) of the side member upper section toward a lower rear section (33c) of the rear wheel arch (33).

Abstract: A vehicle body structure capable of preventing a bumper beam of another vehicle from riding over the rear part of the vehicle body. A vehicle body structure (10) is provided with a rear side door (13) located forward of a rear wheel (17) with respect to the vehicle body, and the rear side door is provided with a rear door beam (21) extended in the front-and-rear direction of the vehicle body. The vehicle body structure is provided with a side member upper section (56) extending toward the rear of the vehicle body from a rear wheel arch (33) and provided on a line extended from the rear door beam (21), and also with a side member lower section (57) extending on a down grade from the rear section (67) of the side member upper section toward a lower rear section (33c) of the rear wheel arch (33).

Abstract: A pair of rear floor frames extend in a fore-and-aft direction in a lower part of a vehicle body. A pair of rear horizontal frames extend in the fore-and-aft direction above corresponding rear wheels. A door beam extends in the fore-and-aft direction in each side door in alignment with the corresponding rear horizontal frame. A pair of rear vertical frames each extend vertically behind the corresponding rear wheel and join rear ends of the corresponding rear floor frame and rear horizontal frame to each other. In a rear end crash with a vehicle having a front bumper at a relatively high position, the rear vertical frames allow the impact energy of the rear end crash to be evenly distributed, and deformation of the passenger compartment is minimized. The rear horizontal frames allow the impact energy to be transmitted to the door beams, contributing to reinforcement of the passenger compartment.

Abstract: In a rear vehicle body structure, a spare tire is received in a spare tire pan in a rear end up slanted orientation, the front end of the spare tire is prevented from forward movement by a spare tire pan cross member, and a rear bottom of the spare tire pan is reinforced. At the time of a rear end crash, the spare tire is tilted substantially to an upright orientation around the front end, and the spare tire pan is deformed in such that the rear bottom folded upon a front bottom wall in the shape of letter Z as seen from side so that the spare tire pan provides a long deformation stroke, and is utilized for absorbing the impact energy of the rear end crash. Preferably, the rear bottom comprises an elevated horizontal part and a stepped portion defining a front edge of the elevated horizontal part.

Abstract: A vehicle body rear structure, which includes a rear frame disposed on each side of a vehicle body; and a tank lower frame disposed beneath the rear frame and on the each side of the vehicle body. The rear frame has a load-displacement characteristic having a ratio F/S of load F to displacement S larger than the ratio F/S of the tank lower frame. A cross sectional deformation of the tank lower frame is suppressed so that the load does not rapidly decrease after reaching a maximum of a bending strength.

Abstract: A rear vehicle body structure including: a cross member which is connected between right and left rear frames extending in the front-rear direction of a vehicle body, the cross member being provided with suspension mounting parts for supporting suspensions of right and left rear wheels; spare pan frames for supporting a spare pan, the spare pan frames being connected to the cross member and extend rearward of the vehicle body from the cross member; and a pair of right and left tank frames which is connected in the vicinity of a center portion of the cross member in the right and left direction of the vehicle body, each of the pair of right and left tank frames extending in the vehicle front-right direction or the vehicle front-left direction from the cross member and being connected to a right or left floor frame or a right or left side sill.

Abstract: In a rear vehicle body structure for a vehicle using a torsion beam suspension system, a laterally extending slot is defined between a vertical front wall of a spare tire pan defined in a rear floor panel and a raised rear end of a front floor panel and a torsion beam of the torsion beam suspension system is received in this slot. The spare tire is received in the spare tire pan in a rear end up slanted orientation. A rear end cross member extends across the vehicle in a rear end of the spare tire pan. In a rear end collision, the spare tire pan is pushed forward by the rear end cross member. The rear end cross member enables the impact load to be evenly distributed to the spare tire pan or the rear floor panel.

Abstract: A rear vehicle body structure including: a cross member which is connected between right and left rear frames extending in the front-rear direction of a vehicle body, the cross member being provided with suspension mounting parts for supporting suspensions of right and left rear wheels; spare pan frames for supporting a spare pan, the spare pan frames being connected to the cross member and extend rearward of the vehicle body from the cross member; and a pair of right and left tank frames which is connected in the vicinity of a center portion of the cross member in the right and left direction of the vehicle body, each of the pair of right and left tank frames extending in the vehicle front-right direction or the vehicle front-left direction from the cross member and being connected to a right or left floor frame or a right or left side sill.

Abstract: The following abstract will replace all prior versions of the abstract in the application: In a rear vehicle body structure for a vehicle using a torsion beam suspension system, a laterally extending slot is defined between a vertical front wall of a spare tire pan defined in a rear floor panel and a raised rear end of a front floor panel, and a torsion beam of the torsion beam suspension system is received in this slot. The spare tire is received in the spare tire pan in a rear end up slanted orientation. A rear end cross member extends across the vehicle in a rear end of the spare tire pan. In a rear end collision, the spare tire pan is pushed forward by the rear end cross member. The rear end cross member enables the impact load to be evenly distributed to the spare tire pan or the rear floor panel.

Abstract: In a rear vehicle body structure, a spare tire is received in a spare tire pan in a rear end up slanted orientation, the front end of the spare tire is prevented from forward movement by a spare tire pan cross member, and a rear bottom of the spare tire pan is reinforced. At the time of a rear end crash, the spare tire is tilted substantially to an upright orientation around the front end, and the spare tire pan is deformed such that the rear bottom is folded upon a front bottom wall in the shape of letter Z as seen from side so that the spare tire pan provides a long deformation stroke, and is utilized for absorbing the impact energy of the rear end crash. Preferably, the rear bottom comprises an elevated horizontal part and a stepped portion defining a front edge of the elevated horizontal part.

Abstract: A pair of rear floor frames extend in a fore-and-aft direction in a lower part of a vehicle body. A pair of rear horizontal frames extend in the fore-and-aft direction above corresponding rear wheels. A door beam extends in the fore-and-aft direction in each side door in alignment with the corresponding rear horizontal frame. A pair of rear vertical frames each extend vertically behind the corresponding rear wheel and join rear ends of the corresponding rear floor frame and rear horizontal frame to each other. In a rear end crash with a vehicle having a front bumper at a relatively high position, the rear vertical frames allow the impact energy of the rear end crash to be evenly distributed, and deformation of the passenger compartment is minimized. The rear horizontal frames allow the impact energy to be transmitted to the door beams, contributing to reinforcement of the passenger compartment.

Abstract: A vehicle body rear structure, which includes: rear frames disposed on both side of a rear portion of a vehicle; a rear floor cross member bridged between the rear frames and jointed to each of the rear frames; a middle floor cross member which is disposed ahead of the rear floor cross member to extend in a vehicle width direction; and a stiffening panel covering a lower side of a fuel tank which is disposed in a space surrounded by the each of the rear frames, the rear floor cross member, and the middle floor cross member. The stiffening panel comprises an upper plate, a lower plate, and a connecting member which connects the upper plate and the lower plate. Furthermore, the stiffening panel has a thickness which transmits a load upon a rear-end collision to a framework member ahead of the stiffening panel.

Abstract: A vehicle body rear structure, which includes a rear frame disposed on each side of a vehicle body, and a tank lower frame disposed beneath the rear frame and on the each side of the vehicle body. The rear frame has a load-displacement characteristic having a ratio F/S of load F to displacement S larger than the ratio F/S of the tank lower frame, A cross sectional deformation of the tank lower frame is suppressed so that the load does not rapidly decrease after reaching a maximum of a bending strength.

Abstract: A vehicle body rear structure, which includes: rear frames disposed on both side of a rear portion of a vehicle; a rear floor cross member bridged between the rear frames and jointed to each of the rear frames; a middle floor cross member which is disposed ahead of the rear floor cross member to extend in a vehicle width direction; and a stiffening panel covering a lower side of a fuel tank which is disposed in a space surrounded by the each of the rear frames, the rear floor cross member, and the middle floor cross member, wherein the stiffening panel comprises an upper plate, a lower plate, and a connecting member which connects the upper plate and the lower plate; and wherein the stiffening panel has a thickness which transmits a load upon a rear-end collision to a framework member ahead of the stiffening panel.

Abstract: A vehicle floor structure is provided in which a plurality of cross-members are extended between left and right floor frame members at predetermined longitudinal intervals, and a floor panel is mounted to the left and right floor frame members and the crossmembers. A corrugated sheet having a plurality of longitudinally oriented ridges is disposed in a space formed by the left and right floor frame members and the crossmembers. Left and right side portions of the corrugated sheet are connected to the left and right floor frame members. Front and rear edge portions of the corrugated sheet are connected to opposite ones of the crossmembers. If the right floor frame member, for example, is subjected to a load upon an offset collision of the vehicle, the load is transmitted to the left floor frame via the corrugated sheet for dispersion.

Abstract: A vehicle floor structure with a floor body provided to a body frame is provided. The floor body is a hollow panel integrally formed by arranging a plurality of core materials with spaces on a flat plate and placing another flat plate over the core materials. In order to increase the rigidity of the entire floor body, core materials in edge portions of the floor body are joined to the body frame.