摘要:
A truss type extruded aluminum section is formed of a pair of planar plates and ribs, wherein hollow portions are formed within said section by the ribs and the planar plates. Vibration-damping resin is provided on the inner surfaces of hollow portions, and particularly on the inner surface of the planar plate and on a single surface of the inclined rib. With this arrangement, the vibration energy bending the planar plate and the rib is converted into a heat energy. In the case of manufacturing such truss type extruded aluminum vibration-damping section, for making easy the insertion of the vibration-damping resin in the hollow portion, the vibration-damping resin is stuck on a plastic film to form a long planar body. The plastic film serves as a cover or an adhesive. Moreover, in the case of directly inserting the vibration-damping resin sheet, the vibration-damping resin sheet is subjected to embossing on the adhesive-bonding side for allowing air to escape. Additionally, in the case using an age-hardening type aluminum alloy, the adhesive-bonding for the vibration-damping resin by heating is performed along with the heat treatment for age-hardening.
摘要:
A truss type extruded aluminum section (1) is formed of a pair of planar plates (2)(3) and ribs (4)(5)(6), wherein hollow portions (7)(8)(9) are formed within the section (1) by the ribs (4)(5)(6) and the planar plates (2)(3). Vibration-damping resin is provided on the inner surfaces of hollow portions (7)(8)(9), and particularly on the inner surface of the planar plate (3) and on a single surface of the inclined rib (4). With this arrangement, the vibration energy bending the planar plate (3) and the rib (4) is converted into a heat energy. In the case of manufacturing such truss type extruded aluminum vibration-damping section (1), for making easy the insertion of the vibration-damping resin in the hollow portion, the vibration-damping resin is stuck on a plastic film (11) to form a long planar body. The plastic film (11) serves as a cover or an adhesive. Moreover, in the case of directly inserting the vibration-damping resin sheet (14), the vibration-damping resin sheet (14) is subjected to embossing on the adhesive-bonding side for allowing air to escape. Additionally, in the case using an age-hardening type aluminum alloy, the adhesive-bonding for the vibration-damping resin by heating is performed along with the heat treatment for age-hardening.
摘要:
The present invention relates to a heat-bonded type vibration-damping resin for a structural member which contains in view of a preferable blending rate asphalt, synthetic rubber, petroleum resin and filler material, and further a heat-bonded type vibration-damping resin for a structural member which contains in view of a preferable blending rate asphalt, filler material, blowing agent. In addition, its basic concept consists in a configuration in which the vibration-damping resin is formed into a sheet and arranged at the surface of the metallic structure used at a place where vibration and noise should be prevented so as to form the vibration-damping structure and a method for manufacturing the vibration-damping structure. The vibration-damping resin can be easily mounted on the surface of the metallic structure having an elongated shape, bonded to it by heating and has a workability in which the mounting work to the metallic plate may be facilitated. In addition, thermoplastic resin and the like can be arranged between the metallic plate and the vibration-damping resin.
摘要:
A vibration-damping section with sound absorbing material includes a sound proof panel, sound absorbing material fixed on one surface thereof and vibration damping material stuck on the top surface or the bottom surface of the sound proof panel one surface of the sound absorbing material which is the opposite side of the sound proof panel can be covered with a porous panel, if necessary, and moreover a joint is provided for hanging and connecting sections for closely connecting themselves one another in a width direction. Since the vibration-damping section with sound absorbing material according to the present invention has above described structure, in particular, it can be fixed on the bottom surface of an elevated bridge and has a sound insulating effect of the radiated noise which are caused by the elevated bridge structure and a sound absorbing effect of the reflected noise and moreover has a vibration damping effect of decreasing occurrence of the secondary noise by reducing the vibration of the sound absorbing panel.
摘要:
In a partition wall panel of the present invention, a panel is formed by arranging a plurality of plates at an interval in the direction of the thickness of the plates and by joining the plates along at least part of the peripheries of the plates or/and at part of the surfaces of the plates using a joint member, and a plurality of such panels are integrated while arranged side by side through a plurality of air layers, and connected along at least part of the peripheries thereof or/and at part of the surfaces thereof using a connecting member. As a result of this construction, a thin, light-weight, and highly sound-insulating multi-layered panel structure can be provided.
摘要:
Disclosed herein is a transformer including: an iron core; and a winding wound around the iron core; wherein the iron core includes a column-shaped output side iron core part, a plurality of column-shaped input side iron core parts, and a connecting iron core part, the winding includes a plurality of primary windings, a secondary winding, and generated magnetic fluxes.
摘要:
A coil (11) is connected in series to a primary winding (1a) of a flyback transformer (1). A series circuit of a capacitor (15) and a switching circuit (12) is connected in parallel to the coil (11). By turning on and off the switching circuit (12), the connection of the capacitor (15) to the coil (11) is switched, to thereby connect or disconnect the coil (11) in an AC fashion. Therefore, it is possible to realize a high voltage regulating circuit which can be made inexpensive.
摘要:
A polypropylene resin composition superior in rigidity, resistances to heat distortion, to secondary deformation, to sink mark forming and to warpage deformation is provided which comprises a specified propylene-ethylene block copolymer and an organic fiber and an optionally added inorganic filler, or a specified modified propylene-ethylene block copolymer and an organic fiber and an optionary added inorganic filler.
摘要:
Polypropylene interior parts for autocars having overcome the drawback of their permanent bulge or secondary deformation due to high temperature exposure is provided, which parts are obtained by molding a material comprising a propylene-ethylene block copolymer prepared by polymerizing propylene at a first stage so that the resulting propylene homopolymer can have a relation between its isotactic pentad ratio (P) and MFR of1.00.gtoreq.P.gtoreq.0.015 log MFR+0.955and can occupy 70 to 95% by weight of the total polymerization quantity, followed by polymerizing ethylene or ethylene and propylene in 30 to 5% by weight of the total polymerization quantity at at least one stage, so as to give an ethylene content occupying 3 to 12% by weight of the total polymerization quantity.
摘要:
A communication device includes a transmitting circuit that includes a quadrature modulator; a receiving circuit that operates as a quadrature demodulator that, when being in a data non-transferring period, starts when power is switched on and ends when receiving operation starts, switches a local oscillator signal to a harmonic receiving signal, and detects the signal level of a harmonic included in a signal output from the transmitting circuit; a harmonic extracting circuit and a voltage control circuit that extract a harmonic from a modulated signal and adjust the harmonic so as to set the signal level less than or equal to a predetermined threshold. When being in the data non-transferring period, the transmitting circuit outputs a signal to the receiving circuit, the signal being generated by combining an amplified modulated signal with an under-adjustment signal.