104 results about "Crashworthiness" patented technology

Crashworthiness designing of a structure using a Hybrid Cellular Automata (HCA) algorithm where field states are computed using finite element analysis (FEA) and the material distribution of the structure is updated at each iteration using cellular automata method. The HCA algorithm optimizes the topology of the structures to achieve certain performance within the limits of various constraints applied to ensure crashworthiness of the structures. The HCA algorithm may also be applied to designing of structures to be fabricated by an extrusion method having the same cross section along the direction of extrusion or stamped structures having thickness varying across the structure.

A miniature tilt-shift type optical anti-vibration voice coil motor structure facilitating production comprises a base, a shell, a lens carrier, three or more magnets, an elastic material, a coil carrier, coils and bosses, wherein the number of the coils and the number of the bosses are each equal to that of the magnets. The base and the shell are fixedly installed together, the lens carrier is installed on the coil carrier through the elastic material, the bosses are installed on the outer side of the coil carrier, each coil is wound around the corresponding boss, the magnets are fixedly installed on the lens carrier, and the magnets are arranged corresponding to the coils. Compared with previous technologies, the motor structure can be simplified effectively; meanwhile, the number of mechanical and electronic connection processes needed during production assembling can be reduced, the motor structure supports the process that the coils are directly wound around the coil carrier, mass production is facilitated, and even full automatic mass production can be achieved. Thus, compared with existing technologies, the motor structure can improve production efficiency and increase the percent of pass, reduce the number of assembling staff, reduce material cost and meanwhile enhance mechanical crashworthiness.

A vehicle instrument panel support structure is provided having fixing and mounting surfaces linked together by ribs in an open space frame structure. The ribs are sized, shaped and positioned to create critical load paths and eliminate the outer skin of the instrument panel support structure. Magnesium alloy material is only placed where it is needed for structure and function. The functionality of the vehicle instrument panel support structure is maintained as are the stiffness and crashworthiness when compared to the traditional design, but the weight of the instrument panel structure and the projected area are reduced. A method of designing an instrument panel support structure using a computer aided engineering platform is also provided.

The invention discloses a crashworthy anti-sinking multi-cabin buoy which comprises a buoy body. A lamp bracket is fixedly arranged on the upper portion of the buoy body and connected with a lamp, a tail pipe is fixedly arranged on the lower portion and connected with a balance weight iron ring, the buoy body is of a hollow structure, a clapboard is arranged in the buoy body and divides an inner cavity of the buoy body into at least two sealed cabins, a rubber retainer is fixedly installed above the water line of the buoy body in a sleeved mode, and a shell of the buoy body comprises a steel plate layer and a glass fiber reinforced plastic layer from inside to outside. The glass fiber reinforced plastic layer is adopted for being combined with the steel plate layer, material is saved, self weight is reduced, maintenance is convenient, and operating cost is reduced. The rubber retainer improves crashworthiness of the buoy and prolongs service life of the buoy. Due to the subdivision design inside the buoy body, buoy sinking is prevented, other auxiliary electronic devices of the buoy can be also effectively protected, ship collision losses are reduced, and working reliability of the buoy is effectively enhanced.

Disclosed are heat-hardened steel with excellent crashworthiness and a method for manufacturing heat-hardenable parts using the same. The heat-hardened steel according to the invention comprises, based on wt %; C: 0.12-0.8%; Cr: 0.01-2%; Mo: 0.2% or less; B: 0.0005-0.08%; Ca: 0.01 or less; Sb: 1.0% or less; and Ti and/or Nb: 0.2%; and the reminder being Fe and inevitable impurities. In addition, the heat-treatment hardening steel satisfies anyone of following conditions i)-iv), wherein condition i) comprises Si: 0.5-3%; Mn: 1-10% and Al: 0.05-2%; condition ii) comprises Si: 1% or less; Mn: 0.5-5%; Al: 0.1-2.5%; and Ni: 0.01-8%; condition iii) comprises Si: 0.5-3%; Mn: 1-10%; Al: 0.1% or less; and Ni: 0.01-8%; and condition iv) comprises Si: 0.5-3%; Mn: 1-10%; Al: 0.1-2.5%; and Ni: 0.01-8%.

The present invention provides a casting having increased crashworthiness including an an aluminum alloy of about 6.0 wt % to about 8.0 wt % Si; about 0.12 wt % to about 0.25 wt % Mg; less than or equal to about 0.35 wt % Cu; less than or equal to about 4.0 wt % Zn; less than or equal to about 0.6 wt % Mn; and less than or equal to about 0.15 wt % Fe, wherein the cast body is treated to a T5 or T6 temper and has a tensile strength ranging from 100 MPa to 180 MPa and has a critical fracture strain greater than 10%. The present invention further provides a method of forming a casting having increased crashworthiness.

Provided is a method for manufacturing a hot press formed steel member that has high strengths, an excellent balance between strength and ductility, and good deformation properties upon crush on collision (crashworthiness). The manufacturing method is highly efficient and allows a high degree of freedom with respect to the shape to be formed. The method manufactures a steel member by heating a steel sheet having a specific chemical composition and subjecting the steel sheet to at least one time of hot press forming. In the method, the heating temperature is equal to or higher than the Ac₃ transformation temperature, and a starting temperature of the hot press forming is in the range from the heating temperature to martensite start (Ms) temperature. Cooling from [(Ms temperature)−150° C.] down to 80° C. is performed so that a tempering parameter (λ) specified by Expression (1) is in the range from 7100 to 8030.

To establish a method for obtaining a hot-press-formed steel member, which exhibits high strength, high tensile elongation (ductility) and high bendability, thereby having excellent deformation characteristics at the time of collision crush (crashworthiness), and which is capable of ensuring excellent delayed fracture resistance. A method for producing a hot-press-formed steel member by heating a steel sheet, which has a chemical component composition containing 0.10% (% by mass, and hereinafter the same shall apply) to 0.30% (inclusive) of C, 1.0% to 2.5% (inclusive) of Si, 1.0% to 3.0% (inclusive) of Si and Al in total and 1.5% to 3.0% (inclusive) of Mn, with the balance consisting of iron and unavoidable impurities, and hot press forming the steel sheet one or more times. The method for producing a hot-press-formed steel member is characterized in that: the heating temperature is set to not less than the Ac3 transformation point; the starting temperature of the hot pressing is set to not more than the heating temperature but not less than the Ms point; and the average cooling rate from (the Ms point−150° C. to 40° C. is set to 5° C./s or less.

A chassis for a vehicle has a locally narrower portion within which is mounted a wheel, and a rigid member extending from the chassis toward the quiescent position of the wheel and ending at a point which is spaced radially from the outer profile and located axially within the thickness of the wheel. Under an impact, the wheel itself will be crushed against the rigid member, absorbing some of the impact energy. The impact energy can also be transmitted via the rigid member to the remainder of the chassis, providing a load path to major mass concentrations elsewhere in the vehicle and allowing energy to be dissipated by the deformation of other structures elsewhere. This can then limit frontal damage to the vehicle and hence reduce the risk of intrusions into the passenger cell. The rigid member can be a column extending towards the wheel, and can end with a flat plate that is positioned tangentially to a local portion of the outer profile. It preferably extends from a point on the chassis outside the locally narrower portion. Oriented in this direction, the rigid member is more able to transfer the impact forces from the crushing wheel to the remainder of the chassis.

The present invention discloses a method for analyzing a crushing property of a composite material coated twelve-rectangular-cross-section thin-walled beam and aims to solve the problem that crushing property analysis of the thin-walled beam cannot be performed by using a finite element method or an experimental method due to a shortage of a geometrical model with a detailed structure in a conceptual design stage of crashworthiness of a car body. The method comprises the steps: 1, deducing an average crushing counter force analytic expression of a non composite material coated hollow twelve-rectangular thin-walled beam; 2, simplifying a stress-strain curve of a fiber reinforced composite material, i.e. in the stretching process, a stress-strain relationship is shown as linearity until the fiber reinforced composite material is broken, and in the compressing process, the stress is kept at a certain level without a change after yielding; 3, calculating a plastic limit bending moment and a limit yielding membrane stress of the fiber reinforced composite material coated twelve-rectangular-cross-section thin-walled beam; 4, correcting an effective crushing distance and a final folding angle of the fiber reinforced composite material coated twelve-rectangular-cross-section thin-walled beam; and 5, deducing the average crushing counter force analytic expression of the fiber reinforced composite material coated twelve-rectangular-cross-section thin-walled beam.

The invention discloses an energy absorption scheme and a layout mode of a lower square tube supporting rod structure of a passenger cabin floor of a civil aircraft. A square tube is used as a structure with high energy absorption efficiency and is applied to design of an energy absorption structure for the body of the civil aircraft. The supporting rod structure is positioned on the lower part of the passenger cabin floor and has the main effect of supporting the passenger cabin floor; the upper part and the lower part of the supporting rod structure are riveted with the lower parts of a passenger cabin floor beam and a body bulkhead respectively; and the lower part of the supporting rod is connected with the body bulkhead by using a reinforcing ribbed plate. The layout mode of the supporting rod structure is that the supporting rod is vertically arranged, and the junction of the lower part of the supporting rod structure and the body bulkhead is positioned at a position of quarter circular arc of the lower bulkhead of the passenger cabin floor of the body. The invention provides the scheme in which the square tube structure is used as the lower supporting rod of the passenger cabin floor, so that the crashworthiness of the body structure can be greatly improved, and the structural design of the original body is not required to be changed.

The high tensile cold-rolled steel sheet consists essentially of 0.04 to 0.13% C, 0.3 to 1.2% Si, 1.0 to 3.5% Mn, 0.04% or less P, 0.01% or less S, 0.07% or less Al, by mass, and balance of Fe and inevitable impurities, has a microstructure containing 50% or larger area percentage of ferrite and 10% or larger area percentage of martensite, has 0.85 to 1.5 of ratio of intervals of the martensite in the rolling direction to those in the sheet thickness direction, and has 8 GPa or larger nano strength of the martensite. The high tensile cold-rolled steel sheet has a good strength-elongation balance, and shows excellent crashworthiness at about 10 s⁻¹ of strain rate. Therefore, the high tensile cold-rolled steel sheet is suitable for reinforcing members for pillar and dashboard of automobile.

The invention discloses a front safety belt upper pivot mounting bracket, which comprises a bracket body and a T-shaped nut, and is characterized in that the section of the bracket body is in a shape like a Chinese character 'JI', the two lower ends of the bracket body are respectively provided with a flange, the middle of the upper surface of the bracket body is provided with a through hole, and the lower part of the T-shaped nut passes through the through hole and is welded on the bracket body. The invention has good stiffness and high strength, can reasonably transmit load, has good crashworthiness, not only meets the mounting of the front safety belt upper pivot, but also meets the requirements of automobile structure stiffness and collision regulations, simultaneously improves the welding efficiency, saves the mounting cost and improves the assembly accuracy.

A mechanical structure crashworthiness simulation experiment platform disclosed by the present invention comprises a table-board, a table body, synchronous drive systems, a waveform generation device and shock isolation devices. A punch is arranged on the table-board, the waveform generation device is arranged between the table-board and a pedestal and is located in the center of the table-board, the synchronous drive systems are arranged at the two sides of the table-board respectively and are connected together via a main shaft, and the plurality of shock isolation devices are distributed between an upper bottom plate and a lower bottom plate evenly. The mechanical structure crashworthiness simulation experiment platform of the present invention adopts the dual-upright column table-board, is large in size and can carry out the whole machine test. The waveform generation device of the present invention does not need to replace an elastic cushion, but just needs to adjust the clamping area of a sleeve to the elastic cushion, and the adjustment process is simple and rapid. The shock isolation devices are arranged between the table body and the ground, thereby not needing the special-purpose foundation, and saving the cost. Meanwhile, the collision waveform is optimized, the generation of the high-frequency harmonic is reduced, and the natural frequency of a collision table is less than 1 HZ.

The invention relates to a parallel support vector machine approximate model optimization method based on automobile crashworthiness. The parallel support vector machine approximate model optimization method comprises the steps of (1) establishing a network; (2) generating initial samples, and automatically transferring the initial samples to a grid node; (3) distributing the initial samples to calculating nodes; (4) generating sample points at random; (5) establishing an approximate model based on SVM (Support Vector Machine); (6) obtaining an error standard of an SVM approximate model, and judging whether the error standard reaches the convergence level or not; if so, constructing an entire SVM model by adopting all the generated nodes; (7) judging whether the entire SVM model converges or not; if so, finishing the process, otherwise, skipping to the step (8); (8) finding out the maximum error region; and (9) calculating the sum of the information of the error region, generating samples at random in the region after the summation, uniformly distributing the samples to the calculation nodes, and skipping to the step (4) till the process is finished. According to the parallel support vector machine approximate model optimization method, the mode that the SVM (support vector machine) is subjected to parallel processing is adopted, so that the modeling speed is greatly increased and the optimization efficiency and the precision are improved.

The invention relates to a method for evaluating the crashworthiness of a welding structure. The method is characterized by comprising the following steps: dividing finite element grids of a train body; longitudinally loading the train body so as to actually measuring or calculating a rigidity value and damping value of each node; carrying out computer simulation on a hot machine coupled welding structure, simulating a residual stress field of each welding line by virtue of an actual welding temperature field, or simulating an actual welding temperature field to actually measuring residual stress field of each welding line as an initial load of each node; loading the train body, carrying out crash test or computer simulation at a certain speed, and continuously solving based on explicit-implicit loads; and evaluating the energy flow of a train head welding structure, actually measuring the plastic deformation of a train head, or carrying out computer simulation, if the plastic deformation exceeds a failure set value, determining that the crashworthiness is insufficient, and otherwise, determining that the crashworthiness is qualified. The method is applied to a typical local welding structure of a high-speed train body, and an evaluation result is relatively true, objective and reliable.

The invention discloses a pedestrian protection-based automobile energy absorption column A and an optimization method thereof. The automobile energy absorption column A comprises a left-side column A and a right-side column A, wherein the left-side column A and the right-side column A are symmetrically distributed on a vehicle center line, and respectively comprise an inner shell, an outer shell and an inner core; the inner shells, the outer shells and the inner cores of the left-side column A and the right-side column A are made of a carbon fiber material; and the inner cores are formed by three-dimensional indented hexagonal negative Poisson's ratio single-cell arrays. The invention furthermore discloses the optimization method of the automobile energy absorption column A; after optimization, two working conditions such as automobile-pedestrian collision and automobile front collision can be considered, so that the automobile crashworthiness and lightweight are ensured under the premise of reducing the pedestrian head injury.

The invention relates to a corrugated sandwich road protection structure. The corrugated sandwich road protection structure comprises spiral columns, a sandwich corrugated plate, main corrugated taper pipe assemblies, and subsidiary corrugated taper pipe assemblies; the sandwich corrugated plate comprises a corrugated shell, and fillers arranged in the corrugated shell; the upper portion of each spiral column rotates along the axis and forms warped surfaces; and each main corrugated taper pipe assembly and each subsidiary corrugated taper pipe assembly are connected with the sandwich corrugated plate and the upper portion of corresponding spiral column, the main corrugated taper pipe assemblies are obliquely connected with the sandwich corrugated plate, and the subsidiary corrugated taper pipe assemblies are vertically connected with the sandwich corrugated plate. The corrugated sandwich road protection structure solves the problems that protective fences of a general road and an expressway are not strong enough in crashworthiness, single in energy-absorbing form, and poor in buffering effects, and cannot effectively prevent vehicles off the road. The corrugated sandwich road protection structure has the beneficial effects of having a characteristic of high energy absorption; being safe and reliable with high stability, strong in crashworthiness, and high in adaptability of impact angle; and being easy to mount, convenient to replace, and high in sustainable use.