60results about How to "Improve vibration damping ability" patented technology

The invention discloses a method for integrally casting a more-than-25-ton large-sized diesel engine V-shaped body by utilizing nodular cast iron. The method comprises the following steps of A1, smelting the nodular cast iron in a smelting furnace, and adding bariumsili and metallurgical carborundum pretreatment agent after the smelting; A2, placing a spheroidizing agent into a bottommost layer of a dam-type spheroidizing ladle, utilizing a nucleating agent to cover a second layer, and utilizing a low-maganese low-alloy broken steel sheet to completely cover and compact a third layer; A3, adding a calcium-barium nucleating agent, charging the melted iron in one step to carry out the tapping metal-stream inoculation, realizing the nucleating effect while carrying out the spheroidizing treatment on charged melted iron, and carrying out the pouring pretreatment on the melted iron in the ladle; A4, placing the metal-stream inoculation agent into a funnel to carry out the pouring metal-stream inoculation; and A5, finally pouring the melted iron with the temperature being more than or equal to 1400 DEG C into a sand box, forming a cast by mold filling and solidifying the melted iron under the feeding of the feeder head liquid metal, and carrying out the heat treatment by utilizing the waste heat of the cast.

The invention provides a damping type buffering device for underwater entry of a navigation body. The damping type buffering device comprises a fairing, a buffering device body and an electromagnet device, wherein the head of the fairing is sealed, and the tail of the fairing is detachably connected with the outer wall of the head of a main elastic body; the buffering device body is arranged in the fairing, located between the head of the fairing and the head of the main elastic body and used for buffering the acting force between the main elastic body and the fairing after the main elastic body enters water; and the electromagnet device is installed in the head of the main elastic body and used for attracting the buffering device body. The damping type buffering device is used for head load reduction in the air-drop or medium-high-speed launching underwater entry process of the navigation body and can be suitable for the buffering load reduction purpose of vertical or large-angle inclined underwater entry of the navigation body at the speed of 20m / s to 100m / s. The damping type buffering device is simple in structure and convenient to implement and install, and different hydraulicdampers can be adjusted or replaced according to actual working conditions and requirements to achieve the load reduction purpose of different degrees.

The invention discloses a pure electric commercial vehicle power assembly suspension system. According to the system, the front end of a power assemble comprising a motor is connected with the middle of a U-shaped-structure front suspension bracket through a front suspension support and a front suspension bolster assembly in sequence; the left end and the right end of the front suspension bracket are connected with a vehicle frame longitudinal beam; the rear end of the power assembly is connected with the vehicle frame longitudinal beam through a rear suspension support and a rear suspension bolster assembly in sequence; the front suspension support, the front suspension bolster assembly and the front suspension bracket are connected with one another in a vertical tightened mode, and the rear suspension support and the rear suspension bolster assembly are also connected in a vertical tightened mode; the front suspension bolster assembly comprises an upper framework, a rubber body and a lower framework; and the upper framework is internally provided with upper grooves, and the lower framework is internally provided with lower protrusion blocks connected with the corresponding upper grooves in a clamped mode. According to the design, the suspension system is suitable for power assemblies where motors are additionally arranged of pure electric commercial vehicles, and good in vibration isolation effect, the assembling difficulty can be lowered, three-direction limiting can be achieved, the weight is low, and the cost is low.

The invention relates to a self-centering locking damping device suitable for a vehicle-mounted photoelectric turntable. An electric locking mechanism part of the device comprises a locking seat and three groups of linear motor locking mechanisms same in configuration and peripherally and uniformly distributed and mounted on a lower absorber mounting seat; the locking seat is fixedly connected to the bottom of an upper connecting flange part, the three groups of linear motor locking mechanisms are arranged on the lower absorber mounting seat at intervals; the upper part of an absorber component is fixedly connected to the upper connecting flange part; when the turntable is in a working mode, locking taper pins of the three groups of linear motor locking mechanisms are respectively inserted into three taper holes of the locking seat, such that a turntable connecting flange is rigidly connected to the absorber mounting seat; when the turntable is in a conveying mode, the locking taper pins of the three groups of linear motor locking mechanisms are separated from the taper holes of the locking seat, such that the turntable connecting flange is separated from the absorber mounting seat. The self-centering locking damping device has two capacities of stabilizing a base and facilitating conveying, and is high in locking precision and reliable in locking.

The invention discloses a shock-insulation and vibration-reduction table and a construction method thereof. The shock-insulation and vibration-reduction table comprises a base and shock isolators, wherein vibration reduction supports are arranged on the base. Grooves for storing the vibration reduction supports are formed in the base. Each vibration reduction support is provided with troughs used for storing the corresponding shock isolator, and the troughs of each vibration reduction support are composed of grooves in the horizontal direction and a groove in the vertical direction. The vibration reduction supports are made of high-damping polymers. The shock isolators are extrusion type friction-pendulum vibration isolators. The shock-insulation and vibration-reduction table has vibration reduction and shock insulation functions at the same time, not only can the horizontal earthquake effect be lowered, but also the vertical earthquake effect can be lowered.

The invention relates to a tuned damper of a controllable jacket type marine wind-driven generator. The tuned damper comprises an external damping cavity unit (1) which is arranged on the ground in asliding manner and an internal damping internal damping unit (5) which is arranged on the external damping cavity unit (1) in a sliding manner, wherein the outer wall of the external damping cavity unit (1) is connected with the wind-driven generator through energy consumption springs (4); a cavity (10) which is sunken downwards is formed in the middle part of the external damping cavity unit (1);the internal damping cavity unit (5) is arranged on a bottom plate of the cavity (10) in a sliding manner; the side wall of the internal damping cavity unit (5) is connected with the inner wall of the cavity (10) through the energy consumption springs (4); the inner part of the external damping cavity unit (1) and the inner part of the internal damping cavity unit (5) are sealed; and liquid (2) is loaded in the external damping cavity unit (1) and the internal damping cavity unit (5), and air is left. Compared with the prior art, the tuned damper disclosed by the invention has various energyconsumption mechanisms under the effect of wind or / and earthquake, and the energy consumption capacity is high.

The invention discloses a magnetorheological elastomer shock absorber which comprises a shock abosrbing rod, an inner sleeve and a base, wherein the shock absorbing rod, the inner sleeve and the base are connected together in the axial direction. The shock absorbing rod extends into the inner sleeve. A piezoelectric module and a shock absorption module are axially arranged between the portion, in the inner sleeve, of the shock absorbing rod and the base. The shock absorption module is mainly composed of an upper permanent magnet, an upper magnetorheological elastomer, a ferromagnet, a lower magnetorheological elastomer and a lower permanent magnet which are arranged together in the axial direction. A coil is arranged on the periphery of the ferromagnet. The two ends of the coil are connected with the piezoelectric module correspondingly. The magnetorheological elastomer shock absorber is compact in structure and high in shock absorption property.

The invention discloses a single degree of freedom magnetic damping shock absorber based on eddy current effect. The absorber comprises a bottom plate, a ring magnet a, a ring magnet b, an aluminum tube, a copper plate bottom plate, a copper plate, a copper plate top plate, a bearing seat, a linear bearing, a bearing end cover, a load, a piston shaft, a step shaft, a fixed collar, a spiral spring,a lower clamping shaft and a fixing screw. The working principle is that when the shock absorber is in working mode, the ring magnet a is stationary and fixed to the lower end, the ring magnet b reciprocates in the vertical direction, the two magnets are attracted to each other, the spiral spring acts as a positive stiffness element to support the load, the relative motion of the ring magnet b generates a time-varying magnetic field, and the copper sheet arranged between the two ring magnets generates an eddy current damping effect under the influence of the magnetic field, the motion of thering magnet b is restrained, and the vibration of the load is reduced by consuming energy. The magnetic damping shock absorber is compact in structure and small in volume, can greatly reduce the resonance peak value of a system, and has good cushioning and damping performance.

The invention discloses a packing box capable of achieving damping vibration attenuation. The box comprises an outer box body and an inner box body which is arranged inside the outer box body and used for storing articles, a vibration attenuation device used for conducting longitudinal vibration attenuation on the inner box body is arranged between the bottom wall of the outer box body and the bottom wall of the inner box body, and the vibration attenuation device comprises a pressing plate, a compression bar, a sleeve, a piston, a spring base plate, a vibration attenuation rubber body and vibration attenuation springs; by arranging the vibration attenuation device for conducting longitudinal vibration attenuation on the inner box body, when the inner box body is subjected to longitudinal oscillation, the vibration attenuation springs and the damping piston work together to generate buffering damping force under the action of the pressing plate and the compression bar, the damping strength is high, when the action of the vibration attenuation springs and the damping piston is ended, and the vibration attenuation rubber body conducts damping vibration attenuation, in other words, the vibration attenuation device of the structure is provided with multilevel vibration attenuation. According to the packing box, the vibration attenuation effect is powerful and good, in the transportation process, the packing box can resist against vibration caused by bumpiness of road conditions, safety of the articles in the transportation process is guaranteed, and the articles are prevented from being damaged.

The invention discloses a self-adaptive inverse vibration isolation control method for a super-magnetostrictive vibration isolation platform. The self-adaptive inverse vibration isolation control method comprises the following steps that S1, a Filtered-epsilon LMS self-adaptive inverse controller is adopted to control a super-magnetostrictive actuator to output isolation vibration. The method utilizes a nonlinear adaptive filter and adopts the self-adaptive inverse controller adopting Filtered-epsilon LMS algorithm structure design, the size of vibration signals of the super-magnetostrictive actuator is estimated, then the Filtered-epsilon LMS self-adaptive inverse controller is adopted to control the super-magnetostrictive actuator to output isolation vibration, and accordingly the vibration isolation control precision and stability of the super-magnetostrictive vibration isolation platform are improved.

The invention relates to a laundry treating apparatus which includes a cabinet, a drum accommodated in the cabinet, a tub accommodating the drum, and a dynamic absorber provided to absorb oscillationof the cabinet. The dynamic absorber includes a support plate coupled to the cabinet, mass bodies movably provided on the support plate, and sliders arranged between the mass bodies and the support plate, and the sliders can enable the mass bodies to perform reciprocating motion on the support plate while attenuating due to frictional force.

The invention relates to a semi-active temperature control vibration reduction device and method based on shape memory alloy. The semi-active temperature control vibration reduction device comprises amass block, wherein the mass block can move in a set plane, the mass block is connected with a rigid rod through a connecting mechanism, an end of the rigid rod extends into a temperature control box, an end plate is fixed to the end of the rigid rod, the end plate is fixedly connected with one end of a spring, the other end of the spring is fixedly connected with the box wall of the temperaturecontrol box, the mass block can drive the end plate to move in the temperature control box through the connecting mechanism and the rigid rod, the spring is made of the shape memory alloy, and a temperature control device is arranged in the temperature control box and is used for controlling the temperature in the temperature control box. According to the vibration reduction device, variable-rigidity intelligent vibration reduction and broadband vibration reduction can be realized.

The invention discloses an energy consumption spherical support base comprising a spherical support base body which can slide unidirectionally and a damping wall arranged on the spherical support base body. The spherical support base body comprises a lower support base plate, a middle main body arranged on the lower support base plate and an upper support base plate arranged on the middle main body. The bottom face of the damping wall is fixed to the top face of the lower support base plate. The upper end of the damping wall is fixedly connected with the middle main body. The energy consumption spherical support base has strong vertical bearing capacity, also has strong capacity of horizontal energy consumption and the excellent damping effect; unidirectional horizontal sliding of the spherical support base is achieved, meanwhile the certain rotating function, strong tensile capacity and insensitivity to the temperature are achieved, and reducing of structure responding can be achieved in a wide frequency domain range; and the damping wall of the energy consumption spherical support base is simple in structure, has the low requirement for sealing performance and is convenient to install and low in cost.

A multi-suspension external connection system on an electric vehicle, including a vehicle frame and a suspension connection device, the vehicle frame includes a rear crossbeam, a left longitudinal beam, a right longitudinal beam, a short longitudinal beam and three crossbeams connected to each other. The suspension connection device includes a left connection unit, a right connection unit and a rear connection unit. The part of the short longitudinal beam sandwiched between the first and second beams is connected to the top of the left connection unit, and the right longitudinal beam is sandwiched between the first and second No. The part between the beams is connected to the top of the right connecting unit, the part of the No. 3 beam sandwiched between the right longitudinal beam and the short longitudinal beam is connected to the top of the rear connecting unit, and the bottom ends of the left, right and rear connecting units All of them are provided with a pipe-through shaft to be connected with the shock absorbing modules on the corresponding left, middle and rear suspensions. This design is not only less difficult to assemble and has higher assembly efficiency, but also has lower manufacturing cost and stronger vibration damping effect.

The invention relates to a sliding bearing body structure of a large-caliber chemical circulating double-suction pump, which consists of a tail end bearing part and a driving end bearing part; the tail end bearing part comprises a tail end bearing pedestal, a tail end half type oil seal cover plate, a tail end half type oil seal, a tail end bearing end cover, a tail end automatic release valve, a tail end bearing cover, a tail end sliding bearing, double tail end thrower rings, a rolling bearing and a bearing tail cover; and the driving end bearing part comprises a driving end bearing pedestal, a driving end half type oil seal cover plate, a driving end half type oil seal, a driving end bearing end cover, a driving end automatic release valve, a driving end bearing cover, a driving end sliding bearing and double driving end thrower rings. The sliding bearing body structure has the advantages that: oil-air mixture is prevented; oil leakage-preventing and dust-proofing effects are better; maintenance, overhaul and replacement are facilitated; the bearings can more stably operate and have high shock-absorbing capability, a good noise-reducing effect, a long service life and high load-bearing capability, and the phenomenon of axial displacement is prevented.

The invention discloses a TLMD vibration isolation system. The system comprises a TLD and multiple TMDs, and each TMD comprises a mass block, a first spring, a second spring, a third spring and liquid; the TLD also comprises liquid and a liquid storage box, and operation steps comprise that before parameters of all parts of the TMDs are selected, the main frequency and external excitation frequency spectrum characteristics of a needed vibration isolation structure are measured, through the vibration isolation need, the modal mass ratio of the TMD and a main structure is determined, and the selection range is 1 to 5%; according to the vibration isolation frequency range determined in S1 and the corresponding mass value, the TMD swing rod length and the spring rigidity are designed, and theTMDs are symmetrically arranged relative to a main structure. The vibration frequency of the mass blocks of the multiple TMDs is adjusted according to the outer motivation, the broadband vibration isolation is achieved, TLD liquid serves as TMD damping liquid, meanwhile, the TLD liquid can vibrate, and through shaking and collision with the wall of the liquid storage box, vibration isolation is achieved.

The invention provides a construction method of a maintainable assembly type floating equipment foundation. The construction method comprises the following steps that S1, peripheral reverse ridge construction is conducted; S2, foundation structure layer construction is conducted; S3, surveying and setting out are conducted, and a vibration isolation layer is installed; S4, a sound insulation layer is installed; S5, a hoistable floating platform is manufactured; S6, the floating platform is hoisted; S7, an assembly type strip-shaped foundation is manufactured; S8, the assembly type strip-shaped foundation is hoisted; S9, a TEL spring shock absorber, a drainage hose and horizontally-arranged springs are installed; S10, a channel steel frame is installed; and S11, equipment is installed and debugged. The maintainable assembly type floating equipment foundation is high in sound insulation and shock absorption capacity, good in waterproof performance and easy to overhaul.

The invention relates to the loudspeaker box system technology field and especially relates to a vibration reduction loudspeaker box system. A loudspeaker box body in the vibration reduction loudspeaker box system adopts an electromagnet to suspend a loudspeaker. A foot stand adopts a hollow column which is filled with a cast iron powder. And a top panel is made of a vibration reduction plate. The column, the top panel and a bottom panel are connected and fixed through spot welding. By using the loudspeaker box system, vibration is small and sound quality is good.

The invention discloses a ground barrier vibration damping device, and relates to the technical field of vibration isolation buildings. The device comprises a vibration damping plate, a particle layer, a water bag layer, a friction layer and a high damping plate, wherein a layer of powdery solid particles is laid in the vibration damping plate to form the particle layer, the water bag layer is arranged between the vibration damping plate and the friction layer, the water bag layer comprises a plurality of closely arranged water bags, the high damping plate is fixedly connected to the side, away from the water bag layer, of the friction layer, and the friction layer and the water bag layer can be mutually rubbed. According to the device, vibration near the foundation can be efficiently reduced.

The invention relates to the technical field of sound systems, specifically to a vibration-reducing loudspeaker box system. A loudspeaker box main body in the vibration-reducing loudspeaker box system adopts electromagnets to suspend a loudspeaker, and a foot stool is a hollow stand column filled with cast iron powder, and vibration reducing legs are arranged at the bottom of the foot stool. The loudspeaker box system is relative small in vibration, and better in tone quality while producing sound.

The invention discloses a gradient pressure-torsion energy storage and vibration reduction structure. The structure is characterized in that a plurality of pressure-torsion unit cells can rotate the load direction when being subjected to load, the pressure-torsion unit cells are arranged to form a layer of energy storage and vibration reduction unit in an array, and a plurality of layers of energy storage and vibration reduction units are sequentially overlapped to form the gradient pressure-torsion energy storage and vibration reduction structure; each pressure-torsion unit cell sequentially comprises an upper face plate, a plurality of pressure-torsion structures, a lower face plate and a bottom plate from top to bottom, and the pressure-torsion structures are arranged between the upper face plates and the lower face plates in an overlapped mode. Impact energy is converted into structure rotation energy and counterweight rotation energy, the energy absorption efficiency of a traditional structure is greatly improved, meanwhile, the structure can further absorb the rotation energy through a transmission means in the rotation process, the structure is high in designability, and the rigidity and the strength of the structure can be improved by increasing the number of inclined rods of the unit cells, so that the structure has a wider application space.

The invention provides a vibration-damping chassis structure, a vibration damping device and a wheelchair. The vibration-damping chassis structure comprises a frame, a front wheel assembly, a middle wheel assembly, a rear wheel assembly, a first vibration damping assembly for reducing vibration of the front wheel assembly, a connecting rod structure and a second vibration reduction assembly for reducing vibration of the rear wheel assembly. The frame is rotatably connected with the front wheel assembly, and the front wheel assembly, the first vibration damping assembly, the connecting rod structure and the middle wheel assembly are sequentially connected. The frame is rotatably connected with the middle wheel assembly, and an elastic piece enabling the middle wheel assembly to move up anddown is connected between the frame and the middle wheel assembly. The frame is rotatably connected with the rear wheel assembly, and the second vibration damping assembly is connected between the frame and the rear wheel assembly. According to the vibration damping chassis structure, the vibration damping device and the wheelchair, in different use scenes, the front wheel assembly can be independently subjected to vibration damping or is in linkage with the middle wheel assembly to avoid vibration, so that the vibration damping device is higher in vibration damping capacity and can be suitable for different bumping conditions.

The invention relates to a high-damping rubber material with high vibration attenuation performance. The material is prepared from 100 parts of brominated butyl rubber, 40-60 parts of a reinforcing agent, 20-60 parts of a filling agent, 10-30 parts of a plasticizer, 1-3 parts of an acid-base regulator, 1-3 parts of a release agent, 2-6 parts of an anti-aging agent RD, 10-40 parts of a Tg regulator, 2-10 parts of an activating agent, 1-2 parts of an activating aid and 4-16 parts of a vulcanizing agent. By replacing the main rubber, the carbon black, the Tg regulator, the vulcanization system and the like, the loss factor of the high-damping rubber material is high (greater than 1.0), and the vibration attenuation capacity is high; through the Tg regulator, the loss factor peak value of thematerial becomes greater, and meanwhile, the peak value also falls within the use temperature range; the vulcanization system enables long cross-linking bonds to be formed among molecular chains so asto increase displacement of forced movement of the molecular chains, so that the loss factor of the material is increased; in addition, the brominated butyl main rubber and the superfine carbon blackcan overcome greater inherent internal friction when the molecular chain of the rubber is displaced, so that the loss factor of the material is improved.

The present invention provides an elevator with a damping device, wherein the damping device not only has a strong damping capacity, but also can implement miniaturization, in particular reduce dimension in a height direction, and be controlled stably. In the elevator with the damping device, an elevator car (1) can move up and down along a guide way arranged in a lifting passage to detect vibration of the elevator car (1), an actuator (27) is controlled to drive based on a detected signal, wherein the elevator comprises a pair of circular disks (21a, 21b) supported by a rotating shaft (41) and hammers (22a, 22b) arranged at a position depart from the rotating shaft (41) on each circular disk, and the circular disks (21a, 21b) are drive to rotate by the actuator (27).

The invention relates to the technical field of sound systems, in particular to a sound box system. A sound box body in the sound box system adopts an electromagnet to levitate a loudspeaker, and foot stands are hollow stand columns filled with cast iron powder. The vibration of the sound box system is smaller and the made sound quality is better.

The invention discloses a thrust converting device of a pulse detonation engine, comprising an aircraft mount, a spring cavity, a linear viscous damper, an engine mount, a parallel spring and a seriesspring; the thrust converting device comprises an aircraft mount, a spring cavity, a linear viscous damper, an engine mount, a parallel spring and a series spring. The thrust conversion device is connected with the aircraft and the pulse detonation engine through an aircraft mount and an engine mount. The linear viscous damper is designed as a symmetrical double-output rod clearance damper, so that the damping property thereof does not change with the change of the motion direction, and is convenient to control. Adopting the structure design of two springs mounted side by side not only improves its ability to isolate high frequency, periodic, pulse-type and large peak-to-peak thrust, but also reduces the axial displacement of the engine. Pulse detonation engine produces periodic, pulsed,large peak-to-peak thrust transfer to the engine mount, through the spring storage energy, damper energy consumption, and ultimately converted into a small fluctuation of the quasi-steady force, through the mount transfer to the aircraft.

The invention discloses a multi-suspension external connection system on an electric automobile, which comprises a frame and a suspension connecting device, wherein the frame comprises a rear cross beam, a left longitudinal beam, a right longitudinal beam, a short longitudinal beam and three cross beams which are connected with one another; the suspension connecting device comprises a left connecting unit, a right connecting unit and a rear connecting unit; the part, which is clamped between the first cross beam and the second cross beam, of the short longitudinal beam is connected with the top end of the left connecting unit; the part, which is clamped between the first cross beam and the second cross beam, of the right longitudinal beam is connected with the top end of the right connecting unit; the part, which is clamped between the right longitudinal beam and the short longitudinal beam, of the third cross beam is connected with the top end of the rear connecting unit; and the bottom ends of the left connecting unit, the right connecting unit and the rear connecting unit are each provided with a pipe penetrating shaft to be connected with corresponding damping modules on left,middle and rear suspensions. According to the design, the assembling difficulty is low, the assembling efficiency is high, the manufacturing cost is low, and the vibration reduction effect is good.

The invention discloses an anti-static composite foamed block stamping base material. The anti-static composite foamed block stamping base material comprises an anti-static composite foamed block stamping base material body, wherein the anti-static composite foamed block stamping base material body comprises a hard and tough plastic sheet, a foaming material and anti-static films, the anti-static composite foamed block stamping base material body is a composite stamping base material, two surfaces, near to outside, are both provided with the anti-static films, the anti-static films are connected with the foaming material through gum, two sides of the hard and tough plastic sheet are provided with crosshatch textures, and the crosshatch textures can provide strong adhesive force, and are powerfully connected with the foaming material through gum. The stamping base material is simple in structure, convenient to use, light in weight and labor-saving; the thickness can be adjusted during molding, so sizes of different specifications can be conveniently produced; a strong damping effect is realized and impact on objects is reduced; inner anti-static sheets with certain crush resistance and bent resistance are provided, so that the production of static is effectively avoided; the anti-static composite foamed block stamping base material is easy to cut and can be punched into arbitrarily shaped blocks for package, turnaround and partition.

The invention discloses a double-arrow type negative poisson ratio honeycomb sandwich plate which is characterized by comprising an upper panel, a sandwich core and a lower panel, the sandwich is arranged between the upper panel and the lower panel and is fixedly connected with the upper panel and the lower panel; the sandwich layer is in a double-arrow-shaped negative poisson ratio honeycomb layer shape and is formed by regularly arranging double-arrow-shaped negative poisson ratio cell elements and vertically arranging the double-arrow-shaped negative poisson ratio cell elements between the upper panel and the lower panel; the double-arrow-shaped negative Poisson's ratio honeycomb sandwich plate is composed of the upper aluminum alloy panel, the lower aluminum alloy panel and the middle double-arrow-shaped negative Poisson's ratio honeycomb sandwich layer, a double-arrow-shaped structure is used as a cell element, the double-arrow-shaped structure has the negative Poisson's ratio effect, when the double-arrow-shaped structure is pressed, the two tail ends of an arrow draw close to the inner side, and the negative Poisson's ratio of the double-arrow-shaped structure is increased. Compared with a traditional laminated plate interlayer mode, buffering, vibration reduction and impact resistance are higher.