Pneumatic cylinders are one of the low-cost actuation sources used in industrial and prosthetic application, since they have a high power/weight ratio, high-tension force and long durability. However, problems with the control, oscillatory motion and compliance of pneumatic systems have prevented their widespread use in advanced robotics. To overcome these shortcomings, a number of newer pneumatic actuators have been developed, such as the McKibben Muscle, Rubber Actuator and Pneumatic Artificial Muscle (PAM) Manipulators. In this paper, the solution for position control of a robot arm with slow motion driven by two pneumatic artificial muscles is presented. However, some limitations still exist, such as a deterioration of the performance of transient response due to the changes in the external load. To overcome this problem, a switching algorithm of the control parameter using a learning vector quantization neural network (LVQNN) is proposed in this paper. The LVQNN estimates the external load of the pneumatic artificial muscle manipulator. The effectiveness of the proposed control algorithm is demonstrated through experiments with different external working loads.

https://koreascience.or.kr:443/article/JAKO200833338223692.pdf

Intelligent Switching Control of a Pneumatic Muscle Robot Arm using Learning Vector Quantization Neural Network

An apparatus having a suspension system with a first part which is acted upon by a mass, a second part, and also an air spring arranged between this first part and this second part. At least one supplementary volume device for air is provided, the volume of which can be varied in a controlled manner, and also a first control device for adjusting the volume of the supplementary volume device.

Apparatus comprising a suspension system and method for adjusting a suspension system

To be able to produce a scissors-type frame of a vehicle seat in a quick and easy manner, the present invention is directed to a scissors-type frame for a vehicle seat, in particular for a motor vehicle seat, comprising a first scissors element and a second scissors element, wherein the scissors-type frame is height-adjustable by means of the two scissors elements, and wherein the scissors-type frame is characterized in that one of the two scissors elements passes through the other of the two scissors elements.

Scissors-type frame for a vehicle seat and method for producing a substructure of a vehicle seat

The invention relates to a vehicle seat ( 1 ) with an upper part ( 5 ) and a lower part ( 6 ) and a frame ( 4 ) arranged between them and vertically adjustable by means of at least one fluid spring ( 11 ) capable of being retracted and extended, wherein a component ( 17 ) with at least one element ( 24 ) of resilient material for the damping of vibrating movements of the vehicle seat ( 1 ) is provided, wherein the component ( 17 ) is connected to a first end ( 20 ) of the fluid spring ( 11 ) and the upper part ( 5 ) of the seat or the lower part ( 6 ) of the seat.

Vehicle Seat with Fluid Spring

Spring-mounted vibration system to reduce vibration with a first spring-mounted part and a second spring-mounted part, wherein the first spring-mounted part and the second spring-mounted part can oscillate relative to each in at least one vibration direction and at least one of the spring-mounted parts can be exposed to a return force on a vibration movement. A control unit is arranged with at least one travel linkage which is connected with at least one of the spring-mounted parts and in which is arranged displaceably at least one guide element connected with a spring element generating the return force and/or the other spring-mounted part.

Spring-mounted vibration system to reduce vibration

In the following paper, the dynamic modeling of a horizontal seat suspension which uses pneumatic muscles for the purpose of active vibration control is discussed. An original control system struct...

Modeling and vibration control of an active horizontal seat suspension with pneumatic muscles

The system has a swinging part (2) and a fixed part (3). A spring (4) and a shock absorber (1) are arranged between the swinging part and the fixed part. The damping force of the shock absorber rises progressively with rising speed of the swinging part with respect to the fixed part. The force level of the shock absorber in course direction and in pressure direction is differently implemented. The damping force of the shock absorber is track dependent.

Spring system for vehicle seating, has spring and shock absorber arranged between swinging part and fixed part, and damping force of shock absorber rises progressively with rising speed of swinging part with respect to fixed part

The method involves subjecting a mass (2) to oscillations and being of certain part (3), where the acceleration of the oscillations is measured over an acceleration sensor (5). The relative movement is measured over a local sensor (7) as well as a pneumatic spring (4). Between the swinging part and the fixed part, the air pressure of measured acceleration and the measured relative is steered in dependence over a control valve (11), so that both acceleration and the relative position is a minimum value. The mechanical or electrical inputs of acceleration of the relative position is recorded. An independent claim is included for suspension.

Vibrations damping method e.g. for suspension system, involves subjecting mass to oscillations and being of certain part where acceleration of oscillations measured over sensor

In this paper, an effective procedure of shaping the vibro-isolation properties of seat suspension system is presented. The simulation model is created to determine the dependence of evaluation cri...

https://journals.sagepub.com/doi/pdf/10.1177/0263092317717586

Shaping the vibro-isolation properties of horizontal seat suspension:

Die Erfindung betrifft ein Verfahren zur Dampfung der Schwingungen in einem Federsystem mit einem mit einer Masse 2 beaufschlagten schwingenden Teil 1 und einem feststehenden Teil 3, wobei die Beschleunigung des schwingenden Teils 1 uber einen Beschleunigungssensor 5 gemessen wird und der Relativweg zwischen dem schwingenden Teil 1 und dem feststehenden Teil 3 uber einem Ortssensor 7 gemessen wird sowie einer Luftfeder 4, die zwischen dem schwingenden Teil 1 und dem feststehenden Teil 3 angeordnet ist, deren Luftdruck in Abhangigkeit der gemessenen Beschleunigung und des gemessenen Relativwegs uber ein Steuerventil 11 gesteuert wird, so dass sowohl die Beschleunigung als auch der Relativweg jeweils einen Minimalwert aufweisen. The invention relates to a method for damping oscillations in a suspension system with an applied with a mass 2 oscillating part 1 and one fixed part 3, wherein the acceleration of the vibration part 1 is measured by an acceleration sensor 5 and the relative distance between the oscillating part 1 and the fixed part 3 is measured by a location sensor 7, and an air spring 4, which is arranged between the oscillating part 1 and the fixed part 3, the air pressure is controlled as a function of the measured acceleration and the measured relative displacement of a control valve 11, so that both the acceleration and the relative distance each having a minimum value. Daruber hinaus betrifft die Erfindung ein Federsystem, mit dem das erfindungsgemase Verfahren durchgefuhrt werden kann. Moreover, the invention relates to a spring system with which the inventive method can be carried out.

Henning Meyer

Papers

Modeling and vibration control of an active horizontal seat suspension with pneumatic muscles

Spring system for vehicle seating, has spring and shock absorber arranged between swinging part and fixed part, and damping force of shock absorber rises progressively with rising speed of swinging part with respect to fixed part

Vibrations damping method e.g. for suspension system, involves subjecting mass to oscillations and being of certain part where acceleration of oscillations measured over sensor

Shaping the vibro-isolation properties of horizontal seat suspension:

Method for damping the vibrations in a suspension system and such a suspension