Related Experiment Video
Updated: Feb 1, 2026
08:08
Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
Published on: May 8, 2014
17.3K
Inertial stability control method for the task space of inertially stabilized platform for spherical mechanism.
Meiyu Wang1, Dapeng Tian2, Cailing Wang3
1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, China.
ISA Transactions
|January 30, 2026
Summary
A novel double-loop disturbance observer (DLDOB) enhances spherical mechanism inertially stabilized platforms (ISPs). This method improves disturbance rejection and stabilization performance by compensating for multisource disturbances in both joint and task spaces.
Area of Science:
- Robotics and Control Systems
- Mechanical Engineering
- Mechatronics
Background:
- Spherical mechanism inertially stabilized platforms (ISPs) offer enhanced motion flexibility and space utilization.
- Current joint space control (JSC) methods are computationally intensive and struggle with multisource disturbances.
Purpose of the Study:
- To propose a double-loop disturbance observer (DLDOB) method in the task space for improved ISP performance.
- To address limitations of existing control strategies for spherical mechanisms.
Main Methods:
- A gravity compensation controller for asymmetric structures.
- A DLDOB combining joint space disturbance observer (DOB) and task space adaptive sliding mode disturbance observer (ASMDO).
- A velocity feedback controller for inertial stabilization.
Main Results:
- The DLDOB method simplifies joint-to-task space transformations.
- It effectively estimates and compensates for disturbances in both joint and task spaces, enhancing robustness.
- Lyapunov stability analysis confirmed system stability.
Conclusions:
- The proposed DLDOB method demonstrates superior disturbance rejection and stabilization performance compared to conventional approaches.
- Simulations and experiments validate the effectiveness of the DLDOB for ISPs.
Related Concept Videos
01:03Inertial Frames of Reference
8.8K
Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
8.8K
01:27Non-inertial Frames of Reference
7.2K
A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
7.2K
03:18Nuclear Stability
23.2K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
To hold positively charged protons together...
23.2K
01:53RNA Stability
35.7K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
35.7K
01:28Stability
418
The time response of a linear time-invariant (LTI) system can be divided into transient and steady-state responses. The transient response represents the system's initial reaction to a change in input and diminishes to zero over time. In contrast, the steady-state response is the behavior that persists after the transient effects have faded.
The stability of an LTI system is determined by the roots of its characteristic equation, known as poles. A system is stable if it produces a bounded...
The stability of an LTI system is determined by the roots of its characteristic equation, known as poles. A system is stable if it produces a bounded...
418
01:14Stability of structures
523
In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
523